HEADER    ENDONUCLEASE                            07-NOV-01   1GPP              
TITLE     CRYSTAL STRUCTURE OF THE S.CEREVISIAE HOMING ENDONUCLEASE PI-SCEI     
TITLE    2 DOMAIN I                                                             
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: ENDONUCLEASE PI-SCEI;                                      
COMPND   3 CHAIN: A;                                                            
COMPND   4 FRAGMENT: PROTEIN SPLICING DOMAIN, RESIDUES 284-466,693-736, SEE     
COMPND   5 REMARK 999;                                                          
COMPND   6 SYNONYM: HOMING ENDONUCLEASE PI-SCEI, VMA1-DERIVED ENDONUCLEASE;     
COMPND   7 EC: 3.6.3.14;                                                        
COMPND   8 ENGINEERED: YES;                                                     
COMPND   9 MUTATION: YES;                                                       
COMPND  10 OTHER_DETAILS: GLY183 LINKS ILE182 AND ALA410, WHERE IN THE FULL     
COMPND  11 LENGTH PROTEIN IS DOMAIN II                                          
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: SACCHAROMYCES CEREVISIAE;                       
SOURCE   3 ORGANISM_COMMON: BAKER'S YEAST;                                      
SOURCE   4 ORGANISM_TAXID: 4932;                                                
SOURCE   5 EXPRESSION_SYSTEM: ESCHERICHIA COLI;                                 
SOURCE   6 EXPRESSION_SYSTEM_TAXID: 562                                         
KEYWDS    ENDONUCLEASE, HOMING, PROTEIN SPLICING                                
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    E.WERNER,W.WENDE,A.PINGOUD,U.HEINEMANN                                
REVDAT   4   13-DEC-23 1GPP    1       REMARK                                   
REVDAT   3   24-JUL-19 1GPP    1       REMARK                                   
REVDAT   2   24-FEB-09 1GPP    1       VERSN                                    
REVDAT   1   19-SEP-02 1GPP    0                                                
JRNL        AUTH   E.WERNER,W.WENDE,A.PINGOUD,U.HEINEMANN                       
JRNL        TITL   HIGH RESOLUTION CRYSTAL STRUCTURE OF DOMAIN I OF THE         
JRNL        TITL 2 SACCHAROMYCES CEREVISIAE HOMING ENDONUCLEASE PI-SCEI         
JRNL        REF    NUCLEIC ACIDS RES.            V.  30  3962 2002              
JRNL        REFN                   ISSN 0305-1048                               
JRNL        PMID   12235380                                                     
JRNL        DOI    10.1093/NAR/GKF523                                           
REMARK   2                                                                      
REMARK   2 RESOLUTION.    1.35 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : REFMAC 5.0                                           
REMARK   3   AUTHORS     : MURSHUDOV,SKUBAK,LEBEDEV,PANNU,STEINER,              
REMARK   3               : NICHOLLS,WINN,LONG,VAGIN                             
REMARK   3                                                                      
REMARK   3    REFINEMENT TARGET : MAXIMUM LIKELIHOOD                            
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 1.35                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 20.00                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : NULL                           
REMARK   3   COMPLETENESS FOR RANGE        (%) : 94.3                           
REMARK   3   NUMBER OF REFLECTIONS             : 47840                          
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) : 0.153                           
REMARK   3   R VALUE            (WORKING SET) : 0.150                           
REMARK   3   FREE R VALUE                     : 0.189                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : 7.300                           
REMARK   3   FREE R VALUE TEST SET COUNT      : 3744                            
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) : 1.35                         
REMARK   3   BIN RESOLUTION RANGE LOW        (A) : 1.39                         
REMARK   3   REFLECTION IN BIN     (WORKING SET) : 2498                         
REMARK   3   BIN COMPLETENESS (WORKING+TEST) (%) : NULL                         
REMARK   3   BIN R VALUE           (WORKING SET) : 0.1760                       
REMARK   3   BIN FREE R VALUE SET COUNT          : 197                          
REMARK   3   BIN FREE R VALUE                    : 0.2370                       
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 1726                                    
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 0                                       
REMARK   3   SOLVENT ATOMS            : 303                                     
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : NULL                           
REMARK   3   MEAN B VALUE      (OVERALL, A**2) : 19.93                          
REMARK   3   OVERALL ANISOTROPIC B VALUE.                                       
REMARK   3    B11 (A**2) : -1.97000                                             
REMARK   3    B22 (A**2) : 1.92000                                              
REMARK   3    B33 (A**2) : -0.59000                                             
REMARK   3    B12 (A**2) : 0.00000                                              
REMARK   3    B13 (A**2) : -0.61000                                             
REMARK   3    B23 (A**2) : 0.00000                                              
REMARK   3                                                                      
REMARK   3  ESTIMATED OVERALL COORDINATE ERROR.                                 
REMARK   3   ESU BASED ON R VALUE                            (A): 0.056         
REMARK   3   ESU BASED ON FREE R VALUE                       (A): 0.055         
REMARK   3   ESU BASED ON MAXIMUM LIKELIHOOD                 (A): 0.048         
REMARK   3   ESU FOR B VALUES BASED ON MAXIMUM LIKELIHOOD (A**2): 2.249         
REMARK   3                                                                      
REMARK   3 CORRELATION COEFFICIENTS.                                            
REMARK   3   CORRELATION COEFFICIENT FO-FC      : 0.976                         
REMARK   3   CORRELATION COEFFICIENT FO-FC FREE : 0.963                         
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES        COUNT    RMS    WEIGHT      
REMARK   3   BOND LENGTHS REFINED ATOMS        (A):  1769 ; 0.018 ; 0.021       
REMARK   3   BOND LENGTHS OTHERS               (A):  1610 ; 0.001 ; 0.020       
REMARK   3   BOND ANGLES REFINED ATOMS   (DEGREES):  2391 ; 1.834 ; 1.958       
REMARK   3   BOND ANGLES OTHERS          (DEGREES):  3751 ; 0.952 ; 3.000       
REMARK   3   TORSION ANGLES, PERIOD 1    (DEGREES):   216 ; 5.345 ; 3.000       
REMARK   3   TORSION ANGLES, PERIOD 2    (DEGREES):  NULL ;  NULL ;  NULL       
REMARK   3   TORSION ANGLES, PERIOD 3    (DEGREES):   327 ;15.100 ;15.000       
REMARK   3   TORSION ANGLES, PERIOD 4    (DEGREES):  NULL ;  NULL ;  NULL       
REMARK   3   CHIRAL-CENTER RESTRAINTS       (A**3):   272 ; 0.159 ; 0.200       
REMARK   3   GENERAL PLANES REFINED ATOMS      (A):  1952 ; 0.008 ; 0.020       
REMARK   3   GENERAL PLANES OTHERS             (A):   363 ; 0.004 ; 0.020       
REMARK   3   NON-BONDED CONTACTS REFINED ATOMS (A):   318 ; 0.262 ; 0.300       
REMARK   3   NON-BONDED CONTACTS OTHERS        (A):  1537 ; 0.200 ; 0.300       
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):   275 ; 0.241 ; 0.500       
REMARK   3   H-BOND (X...Y) OTHERS             (A):     3 ; 0.089 ; 0.500       
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):     8 ; 0.245 ; 0.300       
REMARK   3   SYMMETRY VDW OTHERS               (A):    41 ; 0.192 ; 0.300       
REMARK   3   SYMMETRY H-BOND REFINED ATOMS     (A):    37 ; 0.440 ; 0.500       
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):  1087 ; 2.004 ; 1.500       
REMARK   3   MAIN-CHAIN BOND OTHER ATOMS    (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   MAIN-CHAIN ANGLE REFINED ATOMS (A**2):  1764 ; 2.979 ; 2.000       
REMARK   3   MAIN-CHAIN ANGLE OTHER ATOMS   (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SIDE-CHAIN BOND REFINED ATOMS  (A**2):   682 ; 3.838 ; 3.000       
REMARK   3   SIDE-CHAIN BOND OTHER ATOMS    (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SIDE-CHAIN ANGLE REFINED ATOMS (A**2):   626 ; 5.758 ; 4.500       
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 : BABINET MODEL WITH MASK                              
REMARK   3   PARAMETERS FOR MASK CALCULATION                                    
REMARK   3   VDW PROBE RADIUS   : 1.40                                          
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. FIRST 8 RESIDUES OF THE HIS-TAG AND RESIDUES 55 - 66     
REMARK   3  ARE NOT VISIBLE IN ELECTRON DENSITY.                                
REMARK   4                                                                      
REMARK   4 1GPP COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY PDBE ON 07-NOV-01.                  
REMARK 100 THE DEPOSITION ID IS D_1290008824.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 15-MAY-01                          
REMARK 200  TEMPERATURE           (KELVIN) : 100.0                              
REMARK 200  PH                             : 4.80                               
REMARK 200  NUMBER OF CRYSTALS USED        : 1                                  
REMARK 200                                                                      
REMARK 200  SYNCHROTRON              (Y/N) : Y                                  
REMARK 200  RADIATION SOURCE               : EMBL/DESY, HAMBURG                 
REMARK 200  BEAMLINE                       : BW7B                               
REMARK 200  X-RAY GENERATOR MODEL          : NULL                               
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : 0.8453                             
REMARK 200  MONOCHROMATOR                  : NULL                               
REMARK 200  OPTICS                         : MIRRORS                            
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : IMAGE PLATE                        
REMARK 200  DETECTOR MANUFACTURER          : MARRESEARCH                        
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : DENZO                              
REMARK 200  DATA SCALING SOFTWARE          : SCALEPACK                          
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 51602                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 1.350                              
REMARK 200  RESOLUTION RANGE LOW       (A) : 20.000                             
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : NULL                               
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : 94.1                               
REMARK 200  DATA REDUNDANCY                : 2.500                              
REMARK 200  R MERGE                    (I) : 0.02900                            
REMARK 200  R SYM                      (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 34.5000                            
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.35                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 1.37                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 64.1                               
REMARK 200  DATA REDUNDANCY IN SHELL       : 1.50                               
REMARK 200  R MERGE FOR SHELL          (I) : 0.16400                            
REMARK 200  R SYM FOR SHELL            (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR SHELL         : 2.500                              
REMARK 200                                                                      
REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH                              
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT        
REMARK 200 SOFTWARE USED: AMORE                                                 
REMARK 200 STARTING MODEL: PDB ENTRY 1VDE                                       
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 54.00                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.70                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: 30 % PEG4000, 0.1 M SODIUM CITRATE PH    
REMARK 280  5.6, 0.2 M NH4-ACETATE, PH 4.80                                     
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: C 1 2 1                          
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   X+1/2,Y+1/2,Z                                           
REMARK 290       4555   -X+1/2,Y+1/2,-Z                                         
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  1.000000  0.000000  0.000000       51.42800            
REMARK 290   SMTRY2   3  0.000000  1.000000  0.000000       23.79750            
REMARK 290   SMTRY3   3  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   4 -1.000000  0.000000  0.000000       51.42800            
REMARK 290   SMTRY2   4  0.000000  1.000000  0.000000       23.79750            
REMARK 290   SMTRY3   4  0.000000  0.000000 -1.000000        0.00000            
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: MONOMERIC                         
REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: MONOMERIC                  
REMARK 350 SOFTWARE USED: PQS                                                   
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A                                     
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 400                                                                      
REMARK 400 COMPOUND                                                             
REMARK 400 MUTATIONS: ARG327SER, VAL350MET, ILE415VAL, LEU466GLY                
REMARK 465                                                                      
REMARK 465 MISSING RESIDUES                                                     
REMARK 465 THE FOLLOWING RESIDUES WERE NOT LOCATED IN THE                       
REMARK 465 EXPERIMENT. (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN               
REMARK 465 IDENTIFIER; SSSEQ=SEQUENCE NUMBER; I=INSERTION CODE.)                
REMARK 465                                                                      
REMARK 465   M RES C SSSEQI                                                     
REMARK 465     MET A   -10                                                      
REMARK 465     HIS A    -9                                                      
REMARK 465     HIS A    -8                                                      
REMARK 465     HIS A    -7                                                      
REMARK 465     HIS A    -6                                                      
REMARK 465     HIS A    -5                                                      
REMARK 465     HIS A    -4                                                      
REMARK 465     GLY A    -3                                                      
REMARK 465     GLN A    55                                                      
REMARK 465     HIS A    56                                                      
REMARK 465     ARG A    57                                                      
REMARK 465     ALA A    58                                                      
REMARK 465     HIS A    59                                                      
REMARK 465     LYS A    60                                                      
REMARK 465     SER A    61                                                      
REMARK 465     ASP A    62                                                      
REMARK 465     SER A    63                                                      
REMARK 465     SER A    64                                                      
REMARK 465     ARG A    65                                                      
REMARK 465     GLU A    66                                                      
REMARK 480                                                                      
REMARK 480 ZERO OCCUPANCY ATOM                                                  
REMARK 480 THE FOLLOWING RESIDUES HAVE ATOMS MODELED WITH ZERO                  
REMARK 480 OCCUPANCY. THE LOCATION AND PROPERTIES OF THESE ATOMS                
REMARK 480 MAY NOT BE RELIABLE. (M=MODEL NUMBER; RES=RESIDUE NAME;              
REMARK 480 C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER; I=INSERTION CODE):         
REMARK 480   M RES C SSEQI ATOMS                                                
REMARK 480     LYS A   26   CE   NZ                                             
REMARK 480     LYS A   39   CE   NZ                                             
REMARK 480     LYS A   53   CE   NZ                                             
REMARK 480     SER A   54   OG                                                  
REMARK 480     MET A   67   CB   CG   SD   CE                                   
REMARK 480     LYS A   97   CE   NZ                                             
REMARK 480     LYS A  113   CE   NZ                                             
REMARK 480     LYS A  124   NZ                                                  
REMARK 480     LYS A  128   NZ                                                  
REMARK 480     ARG A  138   NH2                                                 
REMARK 480     LYS A  152   CG   CD   CE   NZ                                   
REMARK 480     LYS A  173   NZ                                                  
REMARK 480     GLU A  422   CG   CD   OE1  OE2                                  
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    HOH A  2171     O    HOH A  2172              0.97            
REMARK 500   O    HOH A  2029     O    HOH A  2030              1.17            
REMARK 500   NZ   LYS A    72     O    HOH A  2118              1.59            
REMARK 500   O    HOH A  2065     O    HOH A  2066              1.72            
REMARK 500   O    HOH A  2163     O    HOH A  2164              1.88            
REMARK 500   O    HOH A  2211     O    HOH A  2212              1.89            
REMARK 500   O    HOH A  2294     O    HOH A  2303              2.00            
REMARK 500   O    HOH A  2162     O    HOH A  2165              2.03            
REMARK 500   O    ALA A   410     O    HOH A  2258              2.04            
REMARK 500   O    HOH A  2066     O    HOH A  2262              2.09            
REMARK 500   SG   CYS A   416     O    HOH A  2255              2.10            
REMARK 500   O    HOH A  2067     O    HOH A  2211              2.16            
REMARK 500   O    HOH A  2098     O    HOH A  2269              2.17            
REMARK 500   O    HOH A  2043     O    HOH A  2045              2.18            
REMARK 500   OE1  GLU A   141     O    HOH A  2207              2.19            
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   O    ARG A    42     NZ   LYS A    72     4555     2.04            
REMARK 500   O    HOH A  2115     O    HOH A  2153     2655     2.06            
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: COVALENT BOND LENGTHS                                      
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,2(A3,1X,A1,I4,A1,1X,A4,3X),1X,F6.3)               
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   RES CSSEQI ATM2   DEVIATION                     
REMARK 500    LYS A  26   CD    LYS A  26   CE      0.151                       
REMARK 500    MET A  67   CB    MET A  67   CG     -0.473                       
REMARK 500    LYS A 128   CE    LYS A 128   NZ      0.192                       
REMARK 500    ARG A 138   CZ    ARG A 138   NH2    -0.082                       
REMARK 500    GLU A 422   CB    GLU A 422   CG      0.143                       
REMARK 500    GLU A 422   CD    GLU A 422   OE1     0.208                       
REMARK 500    GLU A 422   CD    GLU A 422   OE2     0.211                       
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    ARG A 138   NH1 -  CZ  -  NH2 ANGL. DEV. = -11.3 DEGREES          
REMARK 500    ARG A 138   NE  -  CZ  -  NH2 ANGL. DEV. =   8.7 DEGREES          
REMARK 500    ASP A 441   CB  -  CG  -  OD2 ANGL. DEV. =   5.7 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    PHE A 412       13.23     56.30                                   
REMARK 500    LEU A 426     -158.06   -103.03                                   
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 525                                                                      
REMARK 525 SOLVENT                                                              
REMARK 525                                                                      
REMARK 525 THE SOLVENT MOLECULES HAVE CHAIN IDENTIFIERS THAT                    
REMARK 525 INDICATE THE POLYMER CHAIN WITH WHICH THEY ARE MOST                  
REMARK 525 CLOSELY ASSOCIATED. THE REMARK LISTS ALL THE SOLVENT                 
REMARK 525 MOLECULES WHICH ARE MORE THAN 5A AWAY FROM THE                       
REMARK 525 NEAREST POLYMER CHAIN (M = MODEL NUMBER;                             
REMARK 525 RES=RESIDUE NAME; C=CHAIN IDENTIFIER; SSEQ=SEQUENCE                  
REMARK 525 NUMBER; I=INSERTION CODE):                                           
REMARK 525                                                                      
REMARK 525  M RES CSSEQI                                                        
REMARK 525    HOH A2042        DISTANCE =  6.78 ANGSTROMS                       
REMARK 525    HOH A2062        DISTANCE =  7.29 ANGSTROMS                       
REMARK 700                                                                      
REMARK 700 SHEET                                                                
REMARK 700 DETERMINATION METHOD: DSSP                                           
REMARK 700 THE SHEETS PRESENTED AS "AA" IN EACH CHAIN ON SHEET RECORDS          
REMARK 700 BELOW IS ACTUALLY AN  7-STRANDED BARREL THIS IS REPRESENTED BY       
REMARK 700 A  8-STRANDED SHEET IN WHICH THE FIRST AND LAST STRANDS              
REMARK 700 ARE IDENTICAL.                                                       
REMARK 900                                                                      
REMARK 900 RELATED ENTRIES                                                      
REMARK 900 RELATED ID: 1DFA   RELATED DB: PDB                                   
REMARK 900 CRYSTAL STRUCTURE OF PI-SCEI IN C2 SPACE GROUP                       
REMARK 900 RELATED ID: 1VDE   RELATED DB: PDB                                   
REMARK 900 PI-SCEI, A HOMING ENDONUCLEASE WITH PROTEIN SPLICING ACTIVITY        
REMARK 999                                                                      
REMARK 999 SEQUENCE                                                             
REMARK 999 THE PROTEIN PI-SCEI IS AN INTEIN OF THE PRIMARY TRANSLATION          
REMARK 999 PRODUCT OF THE ATP SYNTHASE (SWS ENTRY P17255). IT SPLICES           
REMARK 999 ITSELF OUT OF THE PRECURSOR. PI-SCEI IS A TWO-DOMAIN                 
REMARK 999 PROTEIN. THE ENTRY 1GPP REPRESENTS DOMAIN I WHICH CONSISTS           
REMARK 999 OF RESIDUES 1 TO 182 AND 410 TO 453, DOMAIN II IN THE FULL           
REMARK 999 LENGTH PROTEIN CONSISTS OF RESIDUES 183 TO 409. GLU183 WAS           
REMARK 999 ENGINEERD AS LINKER BETWEEN THE TWO  PARTS OF THE DOMAIN.            
REMARK 999 THE MUTATIONS R54S, M67V AND I132V ARE NOT ENGINEERED BUT            
REMARK 999 TURNED OUT TO BE PRESENT AFTER CLONING FROM BAKERS YEAST             
REMARK 999 COMMERCIALLY AVAILABLE FOR US. THE SEQADV ONLY SHOWS THE             
REMARK 999 DIFFERENCE TO THE DATABASE ENTRY.                                    
DBREF  1GPP A  -10    -1  PDB    1GPP     1GPP           -10     -1             
DBREF  1GPP A    1   183  UNP    P17255   P17255         284    466             
DBREF  1GPP A  410   453  UNP    P17255   P17255         693    736             
SEQADV 1GPP SER A   44  UNP  P17255    ARG   327 ENGINEERED MUTATION            
SEQADV 1GPP MET A   67  UNP  P17255    VAL   350 ENGINEERED MUTATION            
SEQADV 1GPP VAL A  132  UNP  P17255    ILE   415 ENGINEERED MUTATION            
SEQADV 1GPP GLY A  183  UNP  P17255    LEU   466 ENGINEERED MUTATION            
SEQRES   1 A  237  MET HIS HIS HIS HIS HIS HIS GLY SER ALA CYS PHE ALA          
SEQRES   2 A  237  LYS GLY THR ASN VAL LEU MET ALA ASP GLY SER ILE GLU          
SEQRES   3 A  237  CYS ILE GLU ASN ILE GLU VAL GLY ASN LYS VAL MET GLY          
SEQRES   4 A  237  LYS ASP GLY ARG PRO ARG GLU VAL ILE LYS LEU PRO ARG          
SEQRES   5 A  237  GLY SER GLU THR MET TYR SER VAL VAL GLN LYS SER GLN          
SEQRES   6 A  237  HIS ARG ALA HIS LYS SER ASP SER SER ARG GLU MET PRO          
SEQRES   7 A  237  GLU LEU LEU LYS PHE THR CYS ASN ALA THR HIS GLU LEU          
SEQRES   8 A  237  VAL VAL ARG THR PRO ARG SER VAL ARG ARG LEU SER ARG          
SEQRES   9 A  237  THR ILE LYS GLY VAL GLU TYR PHE GLU VAL ILE THR PHE          
SEQRES  10 A  237  GLU MET GLY GLN LYS LYS ALA PRO ASP GLY ARG ILE VAL          
SEQRES  11 A  237  GLU LEU VAL LYS GLU VAL SER LYS SER TYR PRO VAL SER          
SEQRES  12 A  237  GLU GLY PRO GLU ARG ALA ASN GLU LEU VAL GLU SER TYR          
SEQRES  13 A  237  ARG LYS ALA SER ASN LYS ALA TYR PHE GLU TRP THR ILE          
SEQRES  14 A  237  GLU ALA ARG ASP LEU SER LEU LEU GLY SER HIS VAL ARG          
SEQRES  15 A  237  LYS ALA THR TYR GLN THR TYR ALA PRO ILE GLY ALA ALA          
SEQRES  16 A  237  PHE ALA ARG GLU CYS ARG GLY PHE TYR PHE GLU LEU GLN          
SEQRES  17 A  237  GLU LEU LYS GLU ASP ASP TYR TYR GLY ILE THR LEU SER          
SEQRES  18 A  237  ASP ASP SER ASP HIS GLN PHE LEU LEU ALA ASN GLN VAL          
SEQRES  19 A  237  VAL VAL HIS                                                  
FORMUL   2  HOH   *303(H2 O)                                                    
HELIX    1   1 GLU A   19  ILE A   21  5                                   3    
HELIX    2   2 SER A  133  GLY A  135  5                                   3    
HELIX    3   3 PRO A  136  ALA A  149  1                                  14    
HELIX    4   4 ARG A  162  LEU A  167  5                                   6    
HELIX    5   5 GLY A  168  THR A  175  1                                   8    
HELIX    6   6 GLY A  183  ALA A  413  5                                   5    
SHEET    1  AA 8 ALA A  -1  PHE A   2  0                                        
SHEET    2  AA 8 PHE A 421  LEU A 436 -1  O  TYR A 432   N  PHE A   2           
SHEET    3  AA 8 ARG A  42  GLN A  52 -1  O  GLY A  43   N  TYR A 431           
SHEET    4  AA 8 LYS A  72  ASN A  76 -1  O  PHE A  73   N  VAL A  50           
SHEET    5  AA 8 ALA A  -1  PHE A   2 -1  O  CYS A   1   N  ASN A  76           
SHEET    6  AA 8 PHE A 421  LEU A 436 -1  O  TYR A 432   N  PHE A   2           
SHEET    7  AA 8 ARG A  42  GLN A  52 -1  O  GLY A  43   N  TYR A 431           
SHEET    8  AA 8 ALA A  -1  PHE A   2  0                                        
SHEET    1  AB 2 ASN A   7  LEU A   9  0                                        
SHEET    2  AB 2 ILE A  15  CYS A  17 -1  O  GLU A  16   N  VAL A   8           
SHEET    1  AC 2 GLU A  80  PRO A  86  0                                        
SHEET    2  AC 2 TYR A 154  GLU A 160 -1  O  PHE A 155   N  THR A  85           
SHEET    1  AD 3 VAL A  89  ILE A  96  0                                        
SHEET    2  AD 3 VAL A  99  LYS A 113 -1  O  VAL A  99   N  ILE A  96           
SHEET    3  AD 3 ILE A 119  PRO A 131 -1  O  VAL A 120   N  LYS A 112           
SHEET    1  AE 2 GLN A 177  TYR A 179  0                                        
SHEET    2  AE 2 ARG A 417  PHE A 419 -1  O  ARG A 417   N  TYR A 179           
SHEET    1  AF 2 PHE A 444  LEU A 445  0                                        
SHEET    2  AF 2 VAL A 451  VAL A 452 -1  O  VAL A 452   N  PHE A 444           
CRYST1  102.856   47.595   60.297  90.00 121.41  90.00 C 1 2 1       4          
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      0.009722  0.000000  0.005937        0.00000                         
SCALE2      0.000000  0.021011  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.019432        0.00000