HEADER    TRANSPORT PROTEIN                       08-AUG-03   1Q5O              
TITLE     HCN2J 443-645 IN THE PRESENCE OF CAMP, SELENOMETHIONINE DERIVATIVE    
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: POTASSIUM/SODIUM HYPERPOLARIZATION-ACTIVATED CYCLIC        
COMPND   3 NUCLEOTIDE-GATED CHANNEL 2;                                          
COMPND   4 CHAIN: A;                                                            
COMPND   5 FRAGMENT: RESIDUES 443-645;                                          
COMPND   6 SYNONYM: BRAIN CYCLIC NUCLEOTIDE GATED CHANNEL 2, BCNG-2,            
COMPND   7 HYPERPOLARIZATION-ACTIVATED CATION CHANNEL 1, HAC-1;                 
COMPND   8 ENGINEERED: YES                                                      
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: MUS MUSCULUS;                                   
SOURCE   3 ORGANISM_COMMON: HOUSE MOUSE;                                        
SOURCE   4 ORGANISM_TAXID: 10090;                                               
SOURCE   5 ORGAN: BRAIN;                                                        
SOURCE   6 GENE: HCN2, BCNG2 OR HAC1;                                           
SOURCE   7 EXPRESSION_SYSTEM: ESCHERICHIA COLI BL21(DE3);                       
SOURCE   8 EXPRESSION_SYSTEM_TAXID: 469008;                                     
SOURCE   9 EXPRESSION_SYSTEM_STRAIN: BL-21(DE3);                                
SOURCE  10 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID;                              
SOURCE  11 EXPRESSION_SYSTEM_PLASMID: PETGQ                                     
KEYWDS    CNBD, C-LINKER, PACEMAKER, HCN, HCN2, CHANNEL, CYCLIC NUCLEOTIDE,     
KEYWDS   2 CAP, PKA, CAMP, ION CHANNEL, LIGAND, TRANSPORT PROTEIN               
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    W.N.ZAGOTTA,N.B.OLIVIER,K.D.BLACK,E.C.YOUNG,R.OLSON,J.E.GOUAUX        
REVDAT   6   06-NOV-24 1Q5O    1       REMARK                                   
REVDAT   5   15-NOV-23 1Q5O    1       REMARK                                   
REVDAT   4   16-AUG-23 1Q5O    1       REMARK SEQADV LINK                       
REVDAT   3   13-JUL-11 1Q5O    1       VERSN                                    
REVDAT   2   24-FEB-09 1Q5O    1       VERSN                                    
REVDAT   1   09-SEP-03 1Q5O    0                                                
JRNL        AUTH   W.N.ZAGOTTA,N.B.OLIVIER,K.D.BLACK,E.C.YOUNG,R.OLSON,         
JRNL        AUTH 2 J.E.GOUAUX                                                   
JRNL        TITL   STRUCTURAL BASIS FOR MODULATION AND AGONIST SPECIFICITY OF   
JRNL        TITL 2 HCN PACEMAKER CHANNELS                                       
JRNL        REF    NATURE                        V. 425   200 2003              
JRNL        REFN                   ISSN 0028-0836                               
JRNL        PMID   12968185                                                     
JRNL        DOI    10.1038/NATURE01922                                          
REMARK   2                                                                      
REMARK   2 RESOLUTION.    2.30 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : CNS 1.0                                              
REMARK   3   AUTHORS     : BRUNGER,ADAMS,CLORE,DELANO,GROS,GROSSE-              
REMARK   3               : KUNSTLEVE,JIANG,KUSZEWSKI,NILGES,PANNU,              
REMARK   3               : READ,RICE,SIMONSON,WARREN                            
REMARK   3                                                                      
REMARK   3  REFINEMENT TARGET : ENGH & HUBER                                    
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 2.30                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 20.00                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : 0.000                          
REMARK   3   DATA CUTOFF HIGH         (ABS(F)) : NULL                           
REMARK   3   DATA CUTOFF LOW          (ABS(F)) : NULL                           
REMARK   3   COMPLETENESS (WORKING+TEST)   (%) : NULL                           
REMARK   3   NUMBER OF REFLECTIONS             : 10487                          
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 SET) : 0.216                           
REMARK   3   FREE R VALUE                     : 0.261                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : NULL                            
REMARK   3   FREE R VALUE TEST SET COUNT      : 538                             
REMARK   3   ESTIMATED ERROR OF FREE R VALUE  : NULL                            
REMARK   3                                                                      
REMARK   3  FIT IN THE HIGHEST RESOLUTION BIN.                                  
REMARK   3   TOTAL NUMBER OF BINS USED           : NULL                         
REMARK   3   BIN RESOLUTION RANGE HIGH       (A) : 2.30                         
REMARK   3   BIN RESOLUTION RANGE LOW        (A) : 2.44                         
REMARK   3   BIN COMPLETENESS (WORKING+TEST) (%) : 99.50                        
REMARK   3   REFLECTIONS IN BIN    (WORKING SET) : NULL                         
REMARK   3   BIN R VALUE           (WORKING SET) : 0.2180                       
REMARK   3   BIN FREE R VALUE                    : 0.2970                       
REMARK   3   BIN FREE R VALUE TEST SET SIZE  (%) : NULL                         
REMARK   3   BIN FREE R VALUE TEST SET COUNT     : 80                           
REMARK   3   ESTIMATED ERROR OF BIN FREE R VALUE : 0.033                        
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 1599                                    
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 22                                      
REMARK   3   SOLVENT ATOMS            : 129                                     
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : 23.85                          
REMARK   3   MEAN B VALUE      (OVERALL, A**2) : NULL                           
REMARK   3   OVERALL ANISOTROPIC B VALUE.                                       
REMARK   3    B11 (A**2) : 0.44000                                              
REMARK   3    B22 (A**2) : 0.44000                                              
REMARK   3    B33 (A**2) : -0.87000                                             
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 COORDINATE ERROR.                                         
REMARK   3   ESD FROM LUZZATI PLOT        (A) : 0.27                            
REMARK   3   ESD FROM SIGMAA              (A) : 0.10                            
REMARK   3   LOW RESOLUTION CUTOFF        (A) : 5.00                            
REMARK   3                                                                      
REMARK   3  CROSS-VALIDATED ESTIMATED COORDINATE ERROR.                         
REMARK   3   ESD FROM C-V LUZZATI PLOT    (A) : 0.34                            
REMARK   3   ESD FROM C-V SIGMAA          (A) : 0.27                            
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES.                                   
REMARK   3   BOND LENGTHS                 (A) : 0.006                           
REMARK   3   BOND ANGLES            (DEGREES) : 1.200                           
REMARK   3   DIHEDRAL ANGLES        (DEGREES) : 21.60                           
REMARK   3   IMPROPER ANGLES        (DEGREES) : 0.750                           
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL MODEL : NULL                                      
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL FACTOR RESTRAINTS.    RMS    SIGMA                
REMARK   3   MAIN-CHAIN BOND              (A**2) : 1.230 ; 1.500                
REMARK   3   MAIN-CHAIN ANGLE             (A**2) : 1.900 ; 2.000                
REMARK   3   SIDE-CHAIN BOND              (A**2) : 2.396 ; 2.000                
REMARK   3   SIDE-CHAIN ANGLE             (A**2) : 3.343 ; 2.500                
REMARK   3                                                                      
REMARK   3  BULK SOLVENT MODELING.                                              
REMARK   3   METHOD USED : NULL                                                 
REMARK   3   KSOL        : NULL                                                 
REMARK   3   BSOL        : NULL                                                 
REMARK   3                                                                      
REMARK   3  NCS MODEL : NULL                                                    
REMARK   3                                                                      
REMARK   3  NCS RESTRAINTS.                         RMS   SIGMA/WEIGHT          
REMARK   3   GROUP  1  POSITIONAL            (A) : NULL  ; NULL                 
REMARK   3   GROUP  1  B-FACTOR           (A**2) : NULL  ; NULL                 
REMARK   3                                                                      
REMARK   3  PARAMETER FILE  1  : PROTEIN_REP.PARAM                              
REMARK   3  PARAMETER FILE  2  : CMPCNS.PARAM                                   
REMARK   3  PARAMETER FILE  3  : WATER_REP.PARAM                                
REMARK   3  PARAMETER FILE  4  : NULL                                           
REMARK   3  TOPOLOGY FILE  1   : NULL                                           
REMARK   3  TOPOLOGY FILE  2   : NULL                                           
REMARK   3  TOPOLOGY FILE  3   : NULL                                           
REMARK   3  TOPOLOGY FILE  4   : NULL                                           
REMARK   3                                                                      
REMARK   3  OTHER REFINEMENT REMARKS: NULL                                      
REMARK   4                                                                      
REMARK   4 1Q5O COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 13-AUG-03.                  
REMARK 100 THE DEPOSITION ID IS D_1000019947.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 02-JUN-02                          
REMARK 200  TEMPERATURE           (KELVIN) : 100                                
REMARK 200  PH                             : 4.6                                
REMARK 200  NUMBER OF CRYSTALS USED        : 1                                  
REMARK 200                                                                      
REMARK 200  SYNCHROTRON              (Y/N) : Y                                  
REMARK 200  RADIATION SOURCE               : NSLS                               
REMARK 200  BEAMLINE                       : X4A                                
REMARK 200  X-RAY GENERATOR MODEL          : NULL                               
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : 0.96429                            
REMARK 200  MONOCHROMATOR                  : SAGITALLY FOCUSED SI(111)          
REMARK 200  OPTICS                         : NULL                               
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : CCD                                
REMARK 200  DETECTOR MANUFACTURER          : ADSC QUANTUM 4                     
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : DENZO                              
REMARK 200  DATA SCALING SOFTWARE          : SCALEPACK                          
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 13749                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 2.100                              
REMARK 200  RESOLUTION RANGE LOW       (A) : 20.000                             
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : -3.000                             
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : 98.0                               
REMARK 200  DATA REDUNDANCY                : 8.500                              
REMARK 200  R MERGE                    (I) : 0.06900                            
REMARK 200  R SYM                      (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 23.6200                            
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 2.30                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 2.44                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 99.5                               
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: MAD                                            
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT        
REMARK 200 SOFTWARE USED: AMORE                                                 
REMARK 200 STARTING MODEL: PDB ENTRY 1Q43                                       
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 46.96                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.32                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: PEG 400, SODIUM CITRATE, SODIUM          
REMARK 280  CHLORIDE, DTT, HEPES, CAMP, PH 4.6, VAPOR DIFFUSION, HANGING        
REMARK 280  DROP, TEMPERATURE 277K                                              
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 4 21 2                         
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+1/2,X+1/2,Z                                          
REMARK 290       4555   Y+1/2,-X+1/2,Z                                          
REMARK 290       5555   -X+1/2,Y+1/2,-Z                                         
REMARK 290       6555   X+1/2,-Y+1/2,-Z                                         
REMARK 290       7555   Y,X,-Z                                                  
REMARK 290       8555   -Y,-X,-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  0.000000 -1.000000  0.000000       47.71450            
REMARK 290   SMTRY2   3  1.000000  0.000000  0.000000       47.71450            
REMARK 290   SMTRY3   3  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   4  0.000000  1.000000  0.000000       47.71450            
REMARK 290   SMTRY2   4 -1.000000  0.000000  0.000000       47.71450            
REMARK 290   SMTRY3   4  0.000000  0.000000  1.000000        0.00000            
REMARK 290   SMTRY1   5 -1.000000  0.000000  0.000000       47.71450            
REMARK 290   SMTRY2   5  0.000000  1.000000  0.000000       47.71450            
REMARK 290   SMTRY3   5  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   6  1.000000  0.000000  0.000000       47.71450            
REMARK 290   SMTRY2   6  0.000000 -1.000000  0.000000       47.71450            
REMARK 290   SMTRY3   6  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   7  0.000000  1.000000  0.000000        0.00000            
REMARK 290   SMTRY2   7  1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY3   7  0.000000  0.000000 -1.000000        0.00000            
REMARK 290   SMTRY1   8  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY2   8 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY3   8  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 300 REMARK: THE BIOLOGICAL ASSEMBLY IS A TETRAMER. THIS STRUCTURE MAY    
REMARK 300 BE GENERATED BY APPLYING THE SYMMETRY OPERATIONS: Y-1/2,1/2-X,Z AND  
REMARK 300 -X,1-Y,Z AND 1/2-Y,1/2+X,Z                                           
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: TETRAMERIC                        
REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: TETRAMERIC                 
REMARK 350 SOFTWARE USED: PISA,PQS                                              
REMARK 350 TOTAL BURIED SURFACE AREA: 11160 ANGSTROM**2                         
REMARK 350 SURFACE AREA OF THE COMPLEX: 36940 ANGSTROM**2                       
REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -50.0 KCAL/MOL                        
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 350   BIOMT1   2 -1.000000  0.000000  0.000000        0.00000            
REMARK 350   BIOMT2   2  0.000000 -1.000000  0.000000       95.42900            
REMARK 350   BIOMT3   2  0.000000  0.000000  1.000000        0.00000            
REMARK 350   BIOMT1   3  0.000000 -1.000000  0.000000       47.71450            
REMARK 350   BIOMT2   3  1.000000  0.000000  0.000000       47.71450            
REMARK 350   BIOMT3   3  0.000000  0.000000  1.000000        0.00000            
REMARK 350   BIOMT1   4  0.000000  1.000000  0.000000      -47.71450            
REMARK 350   BIOMT2   4 -1.000000  0.000000  0.000000       47.71450            
REMARK 350   BIOMT3   4  0.000000  0.000000  1.000000        0.00000            
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     GLY A   439                                                      
REMARK 465     SER A   440                                                      
REMARK 465     ALA A   441                                                      
REMARK 465     MET A   442                                                      
REMARK 465     LEU A   644                                                      
REMARK 465     HIS A   645                                                      
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     ASP A 443    CB   CG   OD1  OD2                                  
REMARK 470     ARG A 447    CG   CD   NE   CZ   NH1  NH2                        
REMARK 470     GLU A 451    CG   CD   OE1  OE2                                  
REMARK 470     GLN A 455    CG   CD   OE1  NE2                                  
REMARK 470     LYS A 510    CG   CD   CE   NZ                                   
REMARK 470     ILE A 550    CG1  CG2  CD1                                       
REMARK 470     LYS A 552    CG   CD   CE   NZ                                   
REMARK 470     LYS A 553    CG   CD   CE   NZ                                   
REMARK 470     LYS A 567    CG   CD   CE   NZ                                   
REMARK 470     ASN A 569    CG   OD1  ND2                                       
REMARK 470     GLU A 571    CG   CD   OE1  OE2                                  
REMARK 470     LYS A 638    CG   CD   CE   NZ                                   
REMARK 470     LYS A 639    CG   CD   CE   NZ                                   
REMARK 470     SER A 641    OG                                                  
REMARK 470     ILE A 642    CG1  CG2  CD1                                       
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    ASP A 487       75.43   -105.85                                   
REMARK 500    LEU A 495     -149.73    -85.90                                   
REMARK 500    ASN A 569     -177.52     67.60                                   
REMARK 500    LYS A 570      110.27    101.12                                   
REMARK 500    ASP A 576      123.02    -30.31                                   
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 800                                                                      
REMARK 800 SITE                                                                 
REMARK 800 SITE_IDENTIFIER: AC1                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE CMP A 201                 
REMARK 900                                                                      
REMARK 900 RELATED ENTRIES                                                      
REMARK 900 RELATED ID: 1Q3E   RELATED DB: PDB                                   
REMARK 900 SAME PROTEIN COMPLEXED WITH CYCLIC GUANOSINE MONOPHOSPHATE           
REMARK 900 RELATED ID: 1Q43   RELATED DB: PDB                                   
REMARK 900 SAME PROTEIN COMPLEXED WITH ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE     
DBREF  1Q5O A  443   645  UNP    O88703   HCN2_MOUSE     443    645             
SEQADV 1Q5O GLY A  439  UNP  O88703              CLONING ARTIFACT               
SEQADV 1Q5O SER A  440  UNP  O88703              CLONING ARTIFACT               
SEQADV 1Q5O ALA A  441  UNP  O88703              CLONING ARTIFACT               
SEQADV 1Q5O MET A  442  UNP  O88703              CLONING ARTIFACT               
SEQADV 1Q5O MSE A  460  UNP  O88703    MET   460 MODIFIED RESIDUE               
SEQADV 1Q5O MSE A  485  UNP  O88703    MET   485 MODIFIED RESIDUE               
SEQADV 1Q5O MSE A  515  UNP  O88703    MET   515 MODIFIED RESIDUE               
SEQADV 1Q5O MSE A  529  UNP  O88703    MET   529 MODIFIED RESIDUE               
SEQADV 1Q5O MSE A  554  UNP  O88703    MET   554 MODIFIED RESIDUE               
SEQADV 1Q5O MSE A  572  UNP  O88703    MET   572 MODIFIED RESIDUE               
SEQADV 1Q5O MSE A  620  UNP  O88703    MET   620 MODIFIED RESIDUE               
SEQADV 1Q5O MSE A  621  UNP  O88703    MET   621 MODIFIED RESIDUE               
SEQRES   1 A  207  GLY SER ALA MET ASP SER SER ARG ARG GLN TYR GLN GLU          
SEQRES   2 A  207  LYS TYR LYS GLN VAL GLU GLN TYR MSE SER PHE HIS LYS          
SEQRES   3 A  207  LEU PRO ALA ASP PHE ARG GLN LYS ILE HIS ASP TYR TYR          
SEQRES   4 A  207  GLU HIS ARG TYR GLN GLY LYS MSE PHE ASP GLU ASP SER          
SEQRES   5 A  207  ILE LEU GLY GLU LEU ASN GLY PRO LEU ARG GLU GLU ILE          
SEQRES   6 A  207  VAL ASN PHE ASN CYS ARG LYS LEU VAL ALA SER MSE PRO          
SEQRES   7 A  207  LEU PHE ALA ASN ALA ASP PRO ASN PHE VAL THR ALA MSE          
SEQRES   8 A  207  LEU THR LYS LEU LYS PHE GLU VAL PHE GLN PRO GLY ASP          
SEQRES   9 A  207  TYR ILE ILE ARG GLU GLY THR ILE GLY LYS LYS MSE TYR          
SEQRES  10 A  207  PHE ILE GLN HIS GLY VAL VAL SER VAL LEU THR LYS GLY          
SEQRES  11 A  207  ASN LYS GLU MSE LYS LEU SER ASP GLY SER TYR PHE GLY          
SEQRES  12 A  207  GLU ILE CYS LEU LEU THR ARG GLY ARG ARG THR ALA SER          
SEQRES  13 A  207  VAL ARG ALA ASP THR TYR CYS ARG LEU TYR SER LEU SER          
SEQRES  14 A  207  VAL ASP ASN PHE ASN GLU VAL LEU GLU GLU TYR PRO MSE          
SEQRES  15 A  207  MSE ARG ARG ALA PHE GLU THR VAL ALA ILE ASP ARG LEU          
SEQRES  16 A  207  ASP ARG ILE GLY LYS LYS ASN SER ILE LEU LEU HIS              
MODRES 1Q5O MSE A  460  MET  SELENOMETHIONINE                                   
MODRES 1Q5O MSE A  485  MET  SELENOMETHIONINE                                   
MODRES 1Q5O MSE A  515  MET  SELENOMETHIONINE                                   
MODRES 1Q5O MSE A  529  MET  SELENOMETHIONINE                                   
MODRES 1Q5O MSE A  554  MET  SELENOMETHIONINE                                   
MODRES 1Q5O MSE A  572  MET  SELENOMETHIONINE                                   
MODRES 1Q5O MSE A  620  MET  SELENOMETHIONINE                                   
MODRES 1Q5O MSE A  621  MET  SELENOMETHIONINE                                   
HET    MSE  A 460       8                                                       
HET    MSE  A 485       8                                                       
HET    MSE  A 515       8                                                       
HET    MSE  A 529       8                                                       
HET    MSE  A 554       8                                                       
HET    MSE  A 572       8                                                       
HET    MSE  A 620       8                                                       
HET    MSE  A 621       8                                                       
HET    CMP  A 201      22                                                       
HETNAM     MSE SELENOMETHIONINE                                                 
HETNAM     CMP ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE                             
HETSYN     CMP CYCLIC AMP; CAMP                                                 
FORMUL   1  MSE    8(C5 H11 N O2 SE)                                            
FORMUL   2  CMP    C10 H12 N5 O6 P                                              
FORMUL   3  HOH   *129(H2 O)                                                    
HELIX    1   1 ASP A  443  HIS A  463  1                                  21    
HELIX    2   2 PRO A  466  GLN A  482  1                                  17    
HELIX    3   3 ASP A  487  LEU A  495  1                                   9    
HELIX    4   4 ASN A  496  CYS A  508  1                                  13    
HELIX    5   5 CYS A  508  MSE A  515  1                                   8    
HELIX    6   6 MSE A  515  ALA A  521  1                                   7    
HELIX    7   7 ASP A  522  THR A  531  1                                  10    
HELIX    8   8 GLU A  582  ARG A  588  1                                   7    
HELIX    9   9 VAL A  608  TYR A  618  1                                  11    
HELIX   10  10 TYR A  618  ILE A  636  1                                  19    
SHEET    1   A 4 LYS A 534  PHE A 538  0                                        
SHEET    2   A 4 CYS A 601  SER A 607 -1  O  LEU A 603   N  GLU A 536           
SHEET    3   A 4 LYS A 553  HIS A 559 -1  N  HIS A 559   O  ARG A 602           
SHEET    4   A 4 TYR A 579  PHE A 580 -1  O  PHE A 580   N  TYR A 555           
SHEET    1   B 4 TYR A 543  ILE A 545  0                                        
SHEET    2   B 4 SER A 594  ALA A 597 -1  O  VAL A 595   N  ILE A 545           
SHEET    3   B 4 VAL A 561  LEU A 565 -1  N  LEU A 565   O  SER A 594           
SHEET    4   B 4 GLU A 571  SER A 575 -1  O  MSE A 572   N  VAL A 564           
LINK         C   TYR A 459                 N   MSE A 460     1555   1555  1.33  
LINK         C   MSE A 460                 N   SER A 461     1555   1555  1.33  
LINK         C   LYS A 484                 N   MSE A 485     1555   1555  1.33  
LINK         C   MSE A 485                 N   PHE A 486     1555   1555  1.33  
LINK         C   SER A 514                 N   MSE A 515     1555   1555  1.33  
LINK         C   MSE A 515                 N   PRO A 516     1555   1555  1.34  
LINK         C   ALA A 528                 N   MSE A 529     1555   1555  1.33  
LINK         C   MSE A 529                 N   LEU A 530     1555   1555  1.33  
LINK         C   LYS A 553                 N   MSE A 554     1555   1555  1.33  
LINK         C   MSE A 554                 N   TYR A 555     1555   1555  1.33  
LINK         C   GLU A 571                 N   MSE A 572     1555   1555  1.32  
LINK         C   MSE A 572                 N   LYS A 573     1555   1555  1.32  
LINK         C   PRO A 619                 N   MSE A 620     1555   1555  1.33  
LINK         C   MSE A 620                 N   MSE A 621     1555   1555  1.33  
LINK         C   MSE A 621                 N   ARG A 622     1555   1555  1.33  
SITE     1 AC1 12 VAL A 564  MSE A 572  PHE A 580  GLY A 581                    
SITE     2 AC1 12 GLU A 582  ILE A 583  CYS A 584  ARG A 591                    
SITE     3 AC1 12 THR A 592  ALA A 593  ARG A 632  ILE A 636                    
CRYST1   95.429   95.429   50.060  90.00  90.00  90.00 P 4 21 2      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      0.010479  0.000000  0.000000        0.00000                         
SCALE2      0.000000  0.010479  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.019976        0.00000