HEADER    MEMBRANE PROTEIN                        29-FEB-20   6W0F              
TITLE     CLOSED-GATE KCSA SOAKED IN 0MM KCL/5MM BACL2                          
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: FAB HEAVY CHAIN;                                           
COMPND   3 CHAIN: A;                                                            
COMPND   4 ENGINEERED: YES;                                                     
COMPND   5 MOL_ID: 2;                                                           
COMPND   6 MOLECULE: FAB LIGHT CHAIN;                                           
COMPND   7 CHAIN: B;                                                            
COMPND   8 ENGINEERED: YES;                                                     
COMPND   9 MOL_ID: 3;                                                           
COMPND  10 MOLECULE: PH-GATED POTASSIUM CHANNEL KCSA;                           
COMPND  11 CHAIN: C;                                                            
COMPND  12 SYNONYM: STREPTOMYCES LIVIDANS K+ CHANNEL,SKC1;                      
COMPND  13 ENGINEERED: YES                                                      
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: RATTUS NORVEGICUS;                              
SOURCE   3 ORGANISM_TAXID: 10116;                                               
SOURCE   4 EXPRESSION_SYSTEM: HOMO SAPIENS;                                     
SOURCE   5 EXPRESSION_SYSTEM_TAXID: 9606;                                       
SOURCE   6 MOL_ID: 2;                                                           
SOURCE   7 ORGANISM_SCIENTIFIC: RATTUS NORVEGICUS;                              
SOURCE   8 ORGANISM_TAXID: 10116;                                               
SOURCE   9 EXPRESSION_SYSTEM: HOMO SAPIENS;                                     
SOURCE  10 EXPRESSION_SYSTEM_TAXID: 9606;                                       
SOURCE  11 MOL_ID: 3;                                                           
SOURCE  12 ORGANISM_SCIENTIFIC: STREPTOMYCES LIVIDANS;                          
SOURCE  13 ORGANISM_TAXID: 1916;                                                
SOURCE  14 GENE: KCSA, SKC1;                                                    
SOURCE  15 EXPRESSION_SYSTEM: ESCHERICHIA COLI;                                 
SOURCE  16 EXPRESSION_SYSTEM_TAXID: 562                                         
KEYWDS    ION CHANNEL, MEMBRANE PROTEIN                                         
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    A.ROHAIM,L.GONG,J.LI                                                  
REVDAT   5   23-OCT-24 6W0F    1       REMARK                                   
REVDAT   4   11-OCT-23 6W0F    1       REMARK                                   
REVDAT   3   19-AUG-20 6W0F    1       JRNL                                     
REVDAT   2   15-JUL-20 6W0F    1       JRNL                                     
REVDAT   1   08-JUL-20 6W0F    0                                                
JRNL        AUTH   A.ROHAIM,L.GONG,J.LI,H.RUI,L.BLACHOWICZ,B.ROUX               
JRNL        TITL   OPEN AND CLOSED STRUCTURES OF A BARIUM-BLOCKED POTASSIUM     
JRNL        TITL 2 CHANNEL.                                                     
JRNL        REF    J.MOL.BIOL.                   V. 432  4783 2020              
JRNL        REFN                   ESSN 1089-8638                               
JRNL        PMID   32615129                                                     
JRNL        DOI    10.1016/J.JMB.2020.06.012                                    
REMARK   2                                                                      
REMARK   2 RESOLUTION.    2.40 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : REFMAC 5.8.0232                                      
REMARK   3   AUTHORS     : MURSHUDOV,SKUBAK,LEBEDEV,PANNU,STEINER,              
REMARK   3               : NICHOLLS,WINN,LONG,VAGIN                             
REMARK   3                                                                      
REMARK   3    REFINEMENT TARGET : NULL                                          
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 2.40                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 67.84                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : 0.000                          
REMARK   3   COMPLETENESS FOR RANGE        (%) : 99.9                           
REMARK   3   NUMBER OF REFLECTIONS             : 33297                          
REMARK   3                                                                      
REMARK   3  FIT TO DATA USED IN REFINEMENT.                                     
REMARK   3   CROSS-VALIDATION METHOD          : THROUGHOUT                      
REMARK   3   FREE R VALUE TEST SET SELECTION  : RANDOM                          
REMARK   3   R VALUE     (WORKING + TEST SET) : 0.245                           
REMARK   3   R VALUE            (WORKING SET) : 0.244                           
REMARK   3   FREE R VALUE                     : 0.270                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : 5.100                           
REMARK   3   FREE R VALUE TEST SET COUNT      : 1793                            
REMARK   3                                                                      
REMARK   3  FIT IN THE HIGHEST RESOLUTION BIN.                                  
REMARK   3   TOTAL NUMBER OF BINS USED           : 20                           
REMARK   3   BIN RESOLUTION RANGE HIGH       (A) : 2.40                         
REMARK   3   BIN RESOLUTION RANGE LOW        (A) : 2.46                         
REMARK   3   REFLECTION IN BIN     (WORKING SET) : 2493                         
REMARK   3   BIN COMPLETENESS (WORKING+TEST) (%) : 99.89                        
REMARK   3   BIN R VALUE           (WORKING SET) : 0.3980                       
REMARK   3   BIN FREE R VALUE SET COUNT          : 128                          
REMARK   3   BIN FREE R VALUE                    : 0.4100                       
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 4016                                    
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 1                                       
REMARK   3   SOLVENT ATOMS            : 6                                       
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : NULL                           
REMARK   3   MEAN B VALUE      (OVERALL, A**2) : 34.77                          
REMARK   3   OVERALL ANISOTROPIC B VALUE.                                       
REMARK   3    B11 (A**2) : 1.11000                                              
REMARK   3    B22 (A**2) : 1.11000                                              
REMARK   3    B33 (A**2) : -2.21000                                             
REMARK   3    B12 (A**2) : 0.00000                                              
REMARK   3    B13 (A**2) : 0.00000                                              
REMARK   3    B23 (A**2) : 0.00000                                              
REMARK   3                                                                      
REMARK   3  ESTIMATED OVERALL COORDINATE ERROR.                                 
REMARK   3   ESU BASED ON R VALUE                            (A): 0.288         
REMARK   3   ESU BASED ON FREE R VALUE                       (A): 0.229         
REMARK   3   ESU BASED ON MAXIMUM LIKELIHOOD                 (A): NULL          
REMARK   3   ESU FOR B VALUES BASED ON MAXIMUM LIKELIHOOD (A**2): NULL          
REMARK   3                                                                      
REMARK   3 CORRELATION COEFFICIENTS.                                            
REMARK   3   CORRELATION COEFFICIENT FO-FC      : 0.927                         
REMARK   3   CORRELATION COEFFICIENT FO-FC FREE : 0.923                         
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES        COUNT    RMS    WEIGHT      
REMARK   3   BOND LENGTHS REFINED ATOMS        (A):  4120 ; 0.016 ; 0.013       
REMARK   3   BOND LENGTHS OTHERS               (A):  3684 ; 0.037 ; 0.017       
REMARK   3   BOND ANGLES REFINED ATOMS   (DEGREES):  5635 ; 2.019 ; 1.640       
REMARK   3   BOND ANGLES OTHERS          (DEGREES):  8534 ; 2.516 ; 1.565       
REMARK   3   TORSION ANGLES, PERIOD 1    (DEGREES):   531 ; 7.846 ; 5.000       
REMARK   3   TORSION ANGLES, PERIOD 2    (DEGREES):   173 ;34.448 ;21.676       
REMARK   3   TORSION ANGLES, PERIOD 3    (DEGREES):   611 ;12.637 ;15.000       
REMARK   3   TORSION ANGLES, PERIOD 4    (DEGREES):    21 ;19.728 ;15.000       
REMARK   3   CHIRAL-CENTER RESTRAINTS       (A**3):   563 ; 0.081 ; 0.200       
REMARK   3   GENERAL PLANES REFINED ATOMS      (A):  4657 ; 0.009 ; 0.020       
REMARK   3   GENERAL PLANES OTHERS             (A):   878 ; 0.011 ; 0.020       
REMARK   3   NON-BONDED CONTACTS REFINED ATOMS (A):  NULL ;  NULL ;  NULL       
REMARK   3   NON-BONDED CONTACTS OTHERS        (A):  NULL ;  NULL ;  NULL       
REMARK   3   NON-BONDED TORSION REFINED ATOMS  (A):  NULL ;  NULL ;  NULL       
REMARK   3   NON-BONDED TORSION OTHERS         (A):  NULL ;  NULL ;  NULL       
REMARK   3   H-BOND (X...Y) REFINED ATOMS      (A):  NULL ;  NULL ;  NULL       
REMARK   3   H-BOND (X...Y) OTHERS             (A):  NULL ;  NULL ;  NULL       
REMARK   3   POTENTIAL METAL-ION REFINED ATOMS (A):  NULL ;  NULL ;  NULL       
REMARK   3   POTENTIAL METAL-ION OTHERS        (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY VDW REFINED ATOMS        (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY VDW OTHERS               (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY H-BOND REFINED ATOMS     (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY H-BOND OTHERS            (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY METAL-ION REFINED ATOMS  (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY METAL-ION OTHERS         (A):  NULL ;  NULL ;  NULL       
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL FACTOR RESTRAINTS.     COUNT   RMS    WEIGHT      
REMARK   3   MAIN-CHAIN BOND REFINED ATOMS  (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   MAIN-CHAIN BOND OTHER ATOMS    (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   MAIN-CHAIN ANGLE REFINED ATOMS (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   MAIN-CHAIN ANGLE OTHER ATOMS   (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SIDE-CHAIN BOND REFINED ATOMS  (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SIDE-CHAIN BOND OTHER ATOMS    (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SIDE-CHAIN ANGLE REFINED ATOMS (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SIDE-CHAIN ANGLE OTHER ATOMS   (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   LONG RANGE B REFINED ATOMS     (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   LONG RANGE B OTHER ATOMS       (A**2):  NULL ;  NULL ;  NULL       
REMARK   3                                                                      
REMARK   3 ANISOTROPIC THERMAL FACTOR RESTRAINTS.    COUNT   RMS   WEIGHT       
REMARK   3   RIGID-BOND RESTRAINTS          (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SPHERICITY; FREE ATOMS         (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SPHERICITY; BONDED ATOMS       (A**2):  NULL ;  NULL ;  NULL       
REMARK   3                                                                      
REMARK   3  NCS RESTRAINTS STATISTICS                                           
REMARK   3   NUMBER OF DIFFERENT NCS GROUPS : NULL                              
REMARK   3                                                                      
REMARK   3  TLS DETAILS                                                         
REMARK   3   NUMBER OF TLS GROUPS  : NULL                                       
REMARK   3                                                                      
REMARK   3  BULK SOLVENT MODELLING.                                             
REMARK   3   METHOD USED : NULL                                                 
REMARK   3   PARAMETERS FOR MASK CALCULATION                                    
REMARK   3   VDW PROBE RADIUS   : 1.20                                          
REMARK   3   ION PROBE RADIUS   : 0.80                                          
REMARK   3   SHRINKAGE RADIUS   : 0.80                                          
REMARK   3                                                                      
REMARK   3  OTHER REFINEMENT REMARKS: HYDROGENS HAVE BEEN ADDED IN THE RIDING   
REMARK   3  POSITIONS U VALUES : REFINED INDIVIDUALLY                           
REMARK   4                                                                      
REMARK   4 6W0F COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 06-MAR-20.                  
REMARK 100 THE DEPOSITION ID IS D_1000247405.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 28-OCT-18                          
REMARK 200  TEMPERATURE           (KELVIN) : 98                                 
REMARK 200  PH                             : 5.5                                
REMARK 200  NUMBER OF CRYSTALS USED        : 1                                  
REMARK 200                                                                      
REMARK 200  SYNCHROTRON              (Y/N) : Y                                  
REMARK 200  RADIATION SOURCE               : APS                                
REMARK 200  BEAMLINE                       : 24-ID-C                            
REMARK 200  X-RAY GENERATOR MODEL          : NULL                               
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : 0.9791                             
REMARK 200  MONOCHROMATOR                  : NULL                               
REMARK 200  OPTICS                         : NULL                               
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : PIXEL                              
REMARK 200  DETECTOR MANUFACTURER          : DECTRIS PILATUS 6M-F               
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : MOSFLM                             
REMARK 200  DATA SCALING SOFTWARE          : AIMLESS                            
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 35095                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 2.400                              
REMARK 200  RESOLUTION RANGE LOW       (A) : 67.840                             
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : NULL                               
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : 99.9                               
REMARK 200  DATA REDUNDANCY                : 6.900                              
REMARK 200  R MERGE                    (I) : NULL                               
REMARK 200  R SYM                      (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 7.6000                             
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 2.40                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 2.49                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : NULL                               
REMARK 200  DATA REDUNDANCY IN SHELL       : NULL                               
REMARK 200  R MERGE FOR SHELL          (I) : NULL                               
REMARK 200  R SYM FOR SHELL            (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR SHELL         : NULL                               
REMARK 200                                                                      
REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH                              
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT        
REMARK 200 SOFTWARE USED: PHASER                                                
REMARK 200 STARTING MODEL: 1K4C                                                 
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 68.56                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 3.91                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: 20 % PEG 400, 50 MM MAGNESIUM ACETATE,   
REMARK 280  50 MM SODIUM ACETATE, PH 5.5, VAPOR DIFFUSION, HANGING DROP,        
REMARK 280  TEMPERATURE 293K                                                    
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: I 4                              
REMARK 290                                                                      
REMARK 290      SYMOP   SYMMETRY                                                
REMARK 290     NNNMMM   OPERATOR                                                
REMARK 290       1555   X,Y,Z                                                   
REMARK 290       2555   -X,-Y,Z                                                 
REMARK 290       3555   -Y,X,Z                                                  
REMARK 290       4555   Y,-X,Z                                                  
REMARK 290       5555   X+1/2,Y+1/2,Z+1/2                                       
REMARK 290       6555   -X+1/2,-Y+1/2,Z+1/2                                     
REMARK 290       7555   -Y+1/2,X+1/2,Z+1/2                                      
REMARK 290       8555   Y+1/2,-X+1/2,Z+1/2                                      
REMARK 290                                                                      
REMARK 290     WHERE NNN -> OPERATOR NUMBER                                     
REMARK 290           MMM -> TRANSLATION VECTOR                                  
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY TRANSFORMATIONS                            
REMARK 290 THE FOLLOWING TRANSFORMATIONS OPERATE ON THE ATOM/HETATM             
REMARK 290 RECORDS IN THIS ENTRY TO PRODUCE CRYSTALLOGRAPHICALLY                
REMARK 290 RELATED MOLECULES.                                                   
REMARK 290   SMTRY1   1  1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   1  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   1  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   2 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   2  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   2  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   3  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY2   3  1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY3   3  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   4  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY2   4 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY3   4  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   5  1.000000  0.000000  0.000000       77.50450            
REMARK 290   SMTRY2   5  0.000000  1.000000  0.000000       77.50450            
REMARK 290   SMTRY3   5  0.000000  0.000000  1.000000       37.66500            
REMARK 290   SMTRY1   6 -1.000000  0.000000  0.000000       77.50450            
REMARK 290   SMTRY2   6  0.000000 -1.000000  0.000000       77.50450            
REMARK 290   SMTRY3   6  0.000000  0.000000  1.000000       37.66500            
REMARK 290   SMTRY1   7  0.000000 -1.000000  0.000000       77.50450            
REMARK 290   SMTRY2   7  1.000000  0.000000  0.000000       77.50450            
REMARK 290   SMTRY3   7  0.000000  0.000000  1.000000       37.66500            
REMARK 290   SMTRY1   8  0.000000  1.000000  0.000000       77.50450            
REMARK 290   SMTRY2   8 -1.000000  0.000000  0.000000       77.50450            
REMARK 290   SMTRY3   8  0.000000  0.000000  1.000000       37.66500            
REMARK 290                                                                      
REMARK 290 REMARK: NULL                                                         
REMARK 300                                                                      
REMARK 300 BIOMOLECULE: 1                                                       
REMARK 300 SEE REMARK 350 FOR THE AUTHOR PROVIDED AND/OR PROGRAM                
REMARK 300 GENERATED ASSEMBLY INFORMATION FOR THE STRUCTURE IN                  
REMARK 300 THIS ENTRY. THE REMARK MAY ALSO PROVIDE INFORMATION ON               
REMARK 300 BURIED SURFACE AREA.                                                 
REMARK 350                                                                      
REMARK 350 COORDINATES FOR A COMPLETE MULTIMER REPRESENTING THE KNOWN           
REMARK 350 BIOLOGICALLY SIGNIFICANT OLIGOMERIZATION STATE OF THE                
REMARK 350 MOLECULE CAN BE GENERATED BY APPLYING BIOMT TRANSFORMATIONS          
REMARK 350 GIVEN BELOW.  BOTH NON-CRYSTALLOGRAPHIC AND                          
REMARK 350 CRYSTALLOGRAPHIC OPERATIONS ARE GIVEN.                               
REMARK 350                                                                      
REMARK 350 BIOMOLECULE: 1                                                       
REMARK 350 AUTHOR DETERMINED BIOLOGICAL UNIT: DODECAMERIC                       
REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: DODECAMERIC                
REMARK 350 SOFTWARE USED: PISA                                                  
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B, C                               
REMARK 350   BIOMT1   1  1.000000  0.000000  0.000000        0.00000            
REMARK 350   BIOMT2   1  0.000000  1.000000  0.000000        0.00000            
REMARK 350   BIOMT3   1  0.000000  0.000000  1.000000        0.00000            
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B, C                               
REMARK 350   BIOMT1   2 -1.000000  0.000000  0.000000      310.01800            
REMARK 350   BIOMT2   2  0.000000 -1.000000  0.000000      310.01800            
REMARK 350   BIOMT3   2  0.000000  0.000000  1.000000        0.00000            
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B, C                               
REMARK 350   BIOMT1   3  0.000000 -1.000000  0.000000      310.01800            
REMARK 350   BIOMT2   3  1.000000  0.000000  0.000000        0.00000            
REMARK 350   BIOMT3   3  0.000000  0.000000  1.000000        0.00000            
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B, C                               
REMARK 350   BIOMT1   4  0.000000  1.000000  0.000000        0.00000            
REMARK 350   BIOMT2   4 -1.000000  0.000000  0.000000      310.01800            
REMARK 350   BIOMT3   4  0.000000  0.000000  1.000000        0.00000            
REMARK 375                                                                      
REMARK 375 SPECIAL POSITION                                                     
REMARK 375 THE FOLLOWING ATOMS ARE FOUND TO BE WITHIN 0.15 ANGSTROMS            
REMARK 375 OF A SYMMETRY RELATED ATOM AND ARE ASSUMED TO BE ON SPECIAL          
REMARK 375 POSITIONS.                                                           
REMARK 375                                                                      
REMARK 375 ATOM RES CSSEQI                                                      
REMARK 375 K      K C 201  LIES ON A SPECIAL POSITION.                          
REMARK 375      HOH C 302  LIES ON A SPECIAL POSITION.                          
REMARK 470                                                                      
REMARK 470 MISSING ATOM                                                         
REMARK 470 THE FOLLOWING RESIDUES HAVE MISSING ATOMS (M=MODEL NUMBER;           
REMARK 470 RES=RESIDUE NAME; C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER;          
REMARK 470 I=INSERTION CODE):                                                   
REMARK 470   M RES CSSEQI  ATOMS                                                
REMARK 470     GLN A   1    N                                                   
REMARK 470     LYS A  23    CG   CD   CE   NZ                                   
REMARK 470     LYS A  63    CG   CD   CE   NZ                                   
REMARK 470     GLN A  65    CG   CD   OE1  NE2                                  
REMARK 470     LYS A  74    CG   CD   CE   NZ                                   
REMARK 470     GLU A  89    CG   CD   OE1  OE2                                  
REMARK 470     LYS A 120    CG   CD   CE   NZ                                   
REMARK 470     GLN A 136    CG   CD   OE1  NE2                                  
REMARK 470     THR A 137    OG1  CG2                                            
REMARK 470     ASN A 138    CG   OD1  ND2                                       
REMARK 470     SER A 165    OG                                                  
REMARK 470     SER A 166    OG                                                  
REMARK 470     SER A 177    OG                                                  
REMARK 470     ASP A 178    CG   OD1  OD2                                       
REMARK 470     ASP A 219    CG   OD1  OD2                                       
REMARK 470     ASN B 212    CG   OD1  ND2                                       
REMARK 470     SER C  22    OG                                                  
REMARK 470     ARG C 117    CG   CD   NE   CZ   NH1  NH2                        
REMARK 470     HIS C 124    CG   ND1  CD2  CE1  NE2                             
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: CLOSE CONTACTS IN SAME ASYMMETRIC UNIT                     
REMARK 500                                                                      
REMARK 500 THE FOLLOWING ATOMS ARE IN CLOSE CONTACT.                            
REMARK 500                                                                      
REMARK 500  ATM1  RES C  SSEQI   ATM2  RES C  SSEQI           DISTANCE          
REMARK 500   O    ASP A   102     OH   TYR B    50              2.03            
REMARK 500   O    LEU C    81     O    HOH C   301              2.03            
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: CLOSE CONTACTS                                             
REMARK 500                                                                      
REMARK 500 THE FOLLOWING ATOMS THAT ARE RELATED BY CRYSTALLOGRAPHIC             
REMARK 500 SYMMETRY ARE IN CLOSE CONTACT.  AN ATOM LOCATED WITHIN 0.15          
REMARK 500 ANGSTROMS OF A SYMMETRY RELATED ATOM IS ASSUMED TO BE ON A           
REMARK 500 SPECIAL POSITION AND IS, THEREFORE, LISTED IN REMARK 375             
REMARK 500 INSTEAD OF REMARK 500.  ATOMS WITH NON-BLANK ALTERNATE               
REMARK 500 LOCATION INDICATORS ARE NOT INCLUDED IN THE CALCULATIONS.            
REMARK 500                                                                      
REMARK 500 DISTANCE CUTOFF:                                                     
REMARK 500 2.2 ANGSTROMS FOR CONTACTS NOT INVOLVING HYDROGEN ATOMS              
REMARK 500 1.6 ANGSTROMS FOR CONTACTS INVOLVING HYDROGEN ATOMS                  
REMARK 500                                                                      
REMARK 500  ATM1  RES C  SSEQI   ATM2  RES C  SSEQI  SSYMOP   DISTANCE          
REMARK 500   CD2  HIS C    25     O    HOH C   304     3755     2.11            
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: COVALENT BOND ANGLES                                       
REMARK 500                                                                      
REMARK 500 THE STEREOCHEMICAL PARAMETERS OF THE FOLLOWING RESIDUES              
REMARK 500 HAVE VALUES WHICH DEVIATE FROM EXPECTED VALUES BY MORE               
REMARK 500 THAN 6*RMSD (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN               
REMARK 500 IDENTIFIER; SSEQ=SEQUENCE NUMBER; I=INSERTION CODE).                 
REMARK 500                                                                      
REMARK 500 STANDARD TABLE:                                                      
REMARK 500 FORMAT: (10X,I3,1X,A3,1X,A1,I4,A1,3(1X,A4,2X),12X,F5.1)              
REMARK 500                                                                      
REMARK 500 EXPECTED VALUES PROTEIN: ENGH AND HUBER, 1999                        
REMARK 500 EXPECTED VALUES NUCLEIC ACID: CLOWNEY ET AL 1996                     
REMARK 500                                                                      
REMARK 500  M RES CSSEQI ATM1   ATM2   ATM3                                     
REMARK 500    THR C 101   CA  -  CB  -  OG1 ANGL. DEV. = -13.2 DEGREES          
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: TORSION ANGLES                                             
REMARK 500                                                                      
REMARK 500 TORSION ANGLES OUTSIDE THE EXPECTED RAMACHANDRAN REGIONS:            
REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER;               
REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE).                             
REMARK 500                                                                      
REMARK 500 STANDARD TABLE:                                                      
REMARK 500 FORMAT:(10X,I3,1X,A3,1X,A1,I4,A1,4X,F7.2,3X,F7.2)                    
REMARK 500                                                                      
REMARK 500 EXPECTED VALUES: GJ KLEYWEGT AND TA JONES (1996). PHI/PSI-           
REMARK 500 CHOLOGY: RAMACHANDRAN REVISITED. STRUCTURE 4, 1395 - 1400            
REMARK 500                                                                      
REMARK 500  M RES CSSEQI        PSI       PHI                                   
REMARK 500    CYS A  22       91.98   -160.17                                   
REMARK 500    SER A 161       33.19     38.54                                   
REMARK 500    SER A 165      -43.10   -139.84                                   
REMARK 500    ALA B  51      -28.03     76.54                                   
REMARK 500    SER B  52       -6.40   -151.97                                   
REMARK 500    SER B  77       80.21     59.69                                   
REMARK 500    PRO B 141     -176.80    -66.49                                   
REMARK 500    GLN B 156      -37.91   -137.11                                   
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 600                                                                      
REMARK 600 HETEROGEN                                                            
REMARK 600                                                                      
REMARK 600 THE POTASSIUM ION OBSERVED IN THE STRUCTURE CAME FROM THE BUFFER     
REMARK 600 USED DURING GEL FILTRATION PURIFICATION OF KCSA. NO POTASSIUM WAS    
REMARK 600 PRESENT IN THE SOLUTION USED TO SOAK THE CRYSTAL                     
REMARK 620                                                                      
REMARK 620 METAL COORDINATION                                                   
REMARK 620 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER;               
REMARK 620 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE):                             
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                               K C 201   K                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 THR C  75   O                                                      
REMARK 620 2 THR C  75   OG1  48.8                                              
REMARK 620 3 THR C  75   O     0.0  48.8                                        
REMARK 620 4 THR C  75   OG1  48.8   0.0  48.8                                  
REMARK 620 N                    1     2     3                                   
REMARK 800                                                                      
REMARK 800 SITE                                                                 
REMARK 800 SITE_IDENTIFIER: AC1                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: binding site for residue K C 201                   
DBREF  6W0F A    1   219  PDB    6W0F     6W0F             1    219             
DBREF  6W0F B    1   212  PDB    6W0F     6W0F             1    212             
DBREF  6W0F C   22   124  UNP    P0A334   KCSA_STRLI      22    124             
SEQADV 6W0F CYS C   90  UNP  P0A334    LEU    90 ENGINEERED MUTATION            
SEQRES   1 A  219  GLN VAL GLN LEU GLN GLN PRO GLY ALA GLU LEU VAL LYS          
SEQRES   2 A  219  PRO GLY ALA SER VAL LYS LEU SER CYS LYS ALA SER GLY          
SEQRES   3 A  219  TYR THR PHE THR SER ASP TRP ILE HIS TRP VAL LYS GLN          
SEQRES   4 A  219  ARG PRO GLY HIS GLY LEU GLU TRP ILE GLY GLU ILE ILE          
SEQRES   5 A  219  PRO SER TYR GLY ARG ALA ASN TYR ASN GLU LYS ILE GLN          
SEQRES   6 A  219  LYS LYS ALA THR LEU THR ALA ASP LYS SER SER SER THR          
SEQRES   7 A  219  ALA PHE MET GLN LEU SER SER LEU THR SER GLU ASP SER          
SEQRES   8 A  219  ALA VAL TYR TYR CYS ALA ARG GLU ARG GLY ASP GLY TYR          
SEQRES   9 A  219  PHE ALA VAL TRP GLY ALA GLY THR THR VAL THR VAL SER          
SEQRES  10 A  219  SER ALA LYS THR THR PRO PRO SER VAL TYR PRO LEU ALA          
SEQRES  11 A  219  PRO GLY SER ALA ALA GLN THR ASN SER MET VAL THR LEU          
SEQRES  12 A  219  GLY CYS LEU VAL LYS GLY TYR PHE PRO GLU PRO VAL THR          
SEQRES  13 A  219  VAL THR TRP ASN SER GLY SER LEU SER SER GLY VAL HIS          
SEQRES  14 A  219  THR PHE PRO ALA VAL LEU GLN SER ASP LEU TYR THR LEU          
SEQRES  15 A  219  SER SER SER VAL THR VAL PRO SER SER SER TRP PRO SER          
SEQRES  16 A  219  GLU THR VAL THR CYS ASN VAL ALA HIS PRO ALA SER SER          
SEQRES  17 A  219  THR LYS VAL ASP LYS LYS ILE VAL PRO ARG ASP                  
SEQRES   1 B  212  ASP ILE LEU LEU THR GLN SER PRO ALA ILE LEU SER VAL          
SEQRES   2 B  212  SER PRO GLY GLU ARG VAL SER PHE SER CYS ARG ALA SER          
SEQRES   3 B  212  GLN SER ILE GLY THR ASP ILE HIS TRP TYR GLN GLN ARG          
SEQRES   4 B  212  THR ASN GLY SER PRO ARG LEU LEU ILE LYS TYR ALA SER          
SEQRES   5 B  212  GLU SER ILE SER GLY ILE PRO SER ARG PHE SER GLY SER          
SEQRES   6 B  212  GLY SER GLY THR ASP PHE THR LEU SER ILE ASN SER VAL          
SEQRES   7 B  212  GLU SER GLU ASP ILE ALA ASN TYR TYR CYS GLN GLN SER          
SEQRES   8 B  212  ASN ARG TRP PRO PHE THR PHE GLY SER GLY THR LYS LEU          
SEQRES   9 B  212  GLU ILE LYS ARG ALA ASP ALA ALA PRO THR VAL SER ILE          
SEQRES  10 B  212  PHE PRO PRO SER SER GLU GLN LEU THR SER GLY GLY ALA          
SEQRES  11 B  212  SER VAL VAL CYS PHE LEU ASN ASN PHE TYR PRO LYS ASP          
SEQRES  12 B  212  ILE ASN VAL LYS TRP LYS ILE ASP GLY SER GLU ARG GLN          
SEQRES  13 B  212  ASN GLY VAL LEU ASN SER TRP THR ASP GLN ASP SER LYS          
SEQRES  14 B  212  ASP SER THR TYR SER MET SER SER THR LEU THR LEU THR          
SEQRES  15 B  212  LYS ASP GLU TYR GLU ARG HIS ASN SER TYR THR CYS GLU          
SEQRES  16 B  212  ALA THR HIS LYS THR SER THR SER PRO ILE VAL LYS SER          
SEQRES  17 B  212  PHE ASN ARG ASN                                              
SEQRES   1 C  103  SER ALA LEU HIS TRP ARG ALA ALA GLY ALA ALA THR VAL          
SEQRES   2 C  103  LEU LEU VAL ILE VAL LEU LEU ALA GLY SER TYR LEU ALA          
SEQRES   3 C  103  VAL LEU ALA GLU ARG GLY ALA PRO GLY ALA GLN LEU ILE          
SEQRES   4 C  103  THR TYR PRO ARG ALA LEU TRP TRP SER VAL GLU THR ALA          
SEQRES   5 C  103  THR THR VAL GLY TYR GLY ASP LEU TYR PRO VAL THR LEU          
SEQRES   6 C  103  TRP GLY ARG CYS VAL ALA VAL VAL VAL MET VAL ALA GLY          
SEQRES   7 C  103  ILE THR SER PHE GLY LEU VAL THR ALA ALA LEU ALA THR          
SEQRES   8 C  103  TRP PHE VAL GLY ARG GLU GLN GLU ARG ARG GLY HIS              
HET      K  C 201       1                                                       
HETNAM       K POTASSIUM ION                                                    
FORMUL   4    K    K 1+                                                         
FORMUL   5  HOH   *6(H2 O)                                                      
HELIX    1 AA1 THR A   87  SER A   91  5                                   5    
HELIX    2 AA2 SER A  161  SER A  163  5                                   3    
HELIX    3 AA3 PRO A  205  SER A  208  5                                   4    
HELIX    4 AA4 GLU B   79  ILE B   83  5                                   5    
HELIX    5 AA5 SER B  121  THR B  126  1                                   6    
HELIX    6 AA6 LYS B  183  ARG B  188  1                                   6    
HELIX    7 AA7 ALA C   23  ARG C   52  1                                  30    
HELIX    8 AA8 THR C   61  THR C   74  1                                  14    
HELIX    9 AA9 THR C   85  ARG C  121  1                                  37    
SHEET    1 AA1 4 LEU A   4  GLN A   5  0                                        
SHEET    2 AA1 4 VAL A  18  ALA A  24 -1  O  LYS A  23   N  GLN A   5           
SHEET    3 AA1 4 THR A  78  LEU A  83 -1  O  MET A  81   N  LEU A  20           
SHEET    4 AA1 4 ALA A  68  ASP A  73 -1  N  ASP A  73   O  THR A  78           
SHEET    1 AA2 6 ALA A   9  VAL A  12  0                                        
SHEET    2 AA2 6 THR A 112  VAL A 116  1  O  THR A 115   N  VAL A  12           
SHEET    3 AA2 6 ALA A  92  GLU A  99 -1  N  ALA A  92   O  VAL A 114           
SHEET    4 AA2 6 TRP A  33  GLN A  39 -1  N  GLN A  39   O  VAL A  93           
SHEET    5 AA2 6 GLU A  46  ILE A  51 -1  O  GLU A  46   N  LYS A  38           
SHEET    6 AA2 6 ALA A  58  TYR A  60 -1  O  ASN A  59   N  GLU A  50           
SHEET    1 AA3 4 ALA A   9  VAL A  12  0                                        
SHEET    2 AA3 4 THR A 112  VAL A 116  1  O  THR A 115   N  VAL A  12           
SHEET    3 AA3 4 ALA A  92  GLU A  99 -1  N  ALA A  92   O  VAL A 114           
SHEET    4 AA3 4 VAL A 107  TRP A 108 -1  O  VAL A 107   N  ARG A  98           
SHEET    1 AA4 4 SER A 125  LEU A 129  0                                        
SHEET    2 AA4 4 MET A 140  TYR A 150 -1  O  LYS A 148   N  SER A 125           
SHEET    3 AA4 4 TYR A 180  PRO A 189 -1  O  TYR A 180   N  TYR A 150           
SHEET    4 AA4 4 VAL A 168  THR A 170 -1  N  HIS A 169   O  SER A 185           
SHEET    1 AA5 4 SER A 125  LEU A 129  0                                        
SHEET    2 AA5 4 MET A 140  TYR A 150 -1  O  LYS A 148   N  SER A 125           
SHEET    3 AA5 4 TYR A 180  PRO A 189 -1  O  TYR A 180   N  TYR A 150           
SHEET    4 AA5 4 VAL A 174  LEU A 175 -1  N  VAL A 174   O  THR A 181           
SHEET    1 AA6 3 THR A 156  TRP A 159  0                                        
SHEET    2 AA6 3 THR A 199  HIS A 204 -1  O  ASN A 201   N  THR A 158           
SHEET    3 AA6 3 THR A 209  LYS A 214 -1  O  THR A 209   N  HIS A 204           
SHEET    1 AA7 4 LEU B   4  THR B   5  0                                        
SHEET    2 AA7 4 VAL B  19  ALA B  25 -1  O  ARG B  24   N  THR B   5           
SHEET    3 AA7 4 ASP B  70  ILE B  75 -1  O  PHE B  71   N  CYS B  23           
SHEET    4 AA7 4 PHE B  62  SER B  67 -1  N  SER B  65   O  THR B  72           
SHEET    1 AA8 6 ILE B  10  VAL B  13  0                                        
SHEET    2 AA8 6 THR B 102  ILE B 106  1  O  GLU B 105   N  LEU B  11           
SHEET    3 AA8 6 ASN B  85  GLN B  90 -1  N  TYR B  86   O  THR B 102           
SHEET    4 AA8 6 ILE B  33  GLN B  38 -1  N  GLN B  38   O  ASN B  85           
SHEET    5 AA8 6 ARG B  45  LYS B  49 -1  O  LEU B  47   N  TRP B  35           
SHEET    6 AA8 6 GLU B  53  SER B  54 -1  O  GLU B  53   N  LYS B  49           
SHEET    1 AA9 4 ILE B  10  VAL B  13  0                                        
SHEET    2 AA9 4 THR B 102  ILE B 106  1  O  GLU B 105   N  LEU B  11           
SHEET    3 AA9 4 ASN B  85  GLN B  90 -1  N  TYR B  86   O  THR B 102           
SHEET    4 AA9 4 THR B  97  PHE B  98 -1  O  THR B  97   N  GLN B  90           
SHEET    1 AB1 4 THR B 114  PHE B 118  0                                        
SHEET    2 AB1 4 GLY B 129  PHE B 139 -1  O  ASN B 137   N  THR B 114           
SHEET    3 AB1 4 TYR B 173  THR B 182 -1  O  LEU B 179   N  VAL B 132           
SHEET    4 AB1 4 VAL B 159  TRP B 163 -1  N  SER B 162   O  SER B 176           
SHEET    1 AB2 4 SER B 153  ARG B 155  0                                        
SHEET    2 AB2 4 ASN B 145  ILE B 150 -1  N  ILE B 150   O  SER B 153           
SHEET    3 AB2 4 SER B 191  HIS B 198 -1  O  GLU B 195   N  LYS B 147           
SHEET    4 AB2 4 SER B 201  ASN B 210 -1  O  LYS B 207   N  CYS B 194           
SSBOND   1 CYS A   22    CYS A   96                          1555   1555  2.44  
SSBOND   2 CYS A  145    CYS A  200                          1555   1555  2.35  
SSBOND   3 CYS B   23    CYS B   88                          1555   1555  2.25  
SSBOND   4 CYS B  134    CYS B  194                          1555   1555  2.20  
LINK         O   THR C  75                 K     K C 201     1555   1555  2.62  
LINK         OG1 THR C  75                 K     K C 201     1555   1555  3.03  
LINK         O   THR C  75                 K     K C 201     1555   2775  2.62  
LINK         OG1 THR C  75                 K     K C 201     1555   2775  3.03  
CISPEP   1 PHE A  151    PRO A  152          0       -10.77                     
CISPEP   2 GLU A  153    PRO A  154          0        -8.65                     
CISPEP   3 TRP A  193    PRO A  194          0        -1.80                     
CISPEP   4 SER B    7    PRO B    8          0        -8.19                     
CISPEP   5 TRP B   94    PRO B   95          0       -10.26                     
CISPEP   6 TYR B  140    PRO B  141          0        -0.95                     
SITE     1 AC1  1 THR C  75                                                     
CRYST1  155.009  155.009   75.330  90.00  90.00  90.00 I 4           8          
ORIGX1      1.000000  0.000000  0.000000        0.00000                         
ORIGX2      0.000000  1.000000  0.000000        0.00000                         
ORIGX3      0.000000  0.000000  1.000000        0.00000                         
SCALE1      0.006451  0.000000  0.000000        0.00000                         
SCALE2      0.000000  0.006451  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.013275        0.00000