HEADER    LIGASE                                  30-JAN-03   1OBD              
TITLE     SAICAR-SYNTHASE COMPLEXED WITH ATP                                    
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: PHOSPHORIBOSYLAMIDOIMIDAZOLE- SUCCINOCARBOXAMIDE SYNTHASE; 
COMPND   3 CHAIN: A;                                                            
COMPND   4 SYNONYM: SAICAR SYNTHETASE;                                          
COMPND   5 EC: 6.3.2.6                                                          
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: SACCHAROMYCES CEREVISIAE;                       
SOURCE   3 ORGANISM_COMMON: BAKER'S YEAST;                                      
SOURCE   4 ORGANISM_TAXID: 4932                                                 
KEYWDS    SYNTHETASE, ATP BINDING PROTEIN,                                      
KEYWDS   2 PHOSPHORIBOSYLAMINOIMIDAZOLESUCCINOCARBOXAMIDE (SAICAR) SYNTHASE,    
KEYWDS   3 PURINE BIOSYNTHESIS, LIGASE                                          
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    S.V.ANTONYUK,A.I.GREBENKO,V.M.LEVDIKOV,D.V.URUSOVA,W.R.MELIK-ADAMYAN, 
AUTHOR   2 V.S.LAMZIN,K.WILSON                                                  
REVDAT   6   20-NOV-24 1OBD    1       REMARK                                   
REVDAT   5   13-DEC-23 1OBD    1       REMARK LINK                              
REVDAT   4   24-JUL-19 1OBD    1       REMARK                                   
REVDAT   3   08-MAY-19 1OBD    1       REMARK LINK                              
REVDAT   2   24-FEB-09 1OBD    1       VERSN                                    
REVDAT   1   06-MAR-03 1OBD    0                                                
JRNL        AUTH   S.V.ANTONYUK,A.I.GREBENKO,V.M.LEVDIKOV,D.V.URUSOVA,          
JRNL        AUTH 2 W.R.MELIK-ADAMYAN,V.S.LAMZIN,K.WILSON                        
JRNL        TITL   X-RAY STRUCTURE OF SAICAR-SYNTHASE COMPLEXED WITH ATP        
JRNL        REF    KRISTALLOGRAFIYA              V.  46   620 2001              
JRNL        REFN                   ISSN 0023-4761                               
REMARK   1                                                                      
REMARK   1 REFERENCE 1                                                          
REMARK   1  AUTH   V.M.LEVDIKOV,V.V.BARYNIN,A.I.GREBENKO,W.R.MELIK-ADAMYAN,     
REMARK   1  AUTH 2 V.S.LAMZIN,K.S.WILSON                                        
REMARK   1  TITL   THE STRUCTURE OF SAICAR SYNTHASE: AN ENZYME IN THE DE NOVO   
REMARK   1  TITL 2 PATHWAY OF PURINE NUCLEOTIDE BIOSYNTHESIS                    
REMARK   1  REF    STRUCTURE                     V.   6   363 1998              
REMARK   1  REFN                   ISSN 0969-2126                               
REMARK   1  PMID   9551557                                                      
REMARK   1  DOI    10.1016/S0969-2126(98)00038-0                                
REMARK   2                                                                      
REMARK   2 RESOLUTION.    1.40 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : REFMAC                                               
REMARK   3   AUTHORS     : MURSHUDOV,SKUBAK,LEBEDEV,PANNU,STEINER,              
REMARK   3               : NICHOLLS,WINN,LONG,VAGIN                             
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 1.40                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 30.00                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : NULL                           
REMARK   3   COMPLETENESS FOR RANGE        (%) : 97.0                           
REMARK   3   NUMBER OF REFLECTIONS             : 53449                          
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) : 0.156                           
REMARK   3   R VALUE            (WORKING SET) : 0.152                           
REMARK   3   FREE R VALUE                     : 0.195                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : 10.100                          
REMARK   3   FREE R VALUE TEST SET COUNT      : 5989                            
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 2381                                    
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 66                                      
REMARK   3   SOLVENT ATOMS            : 526                                     
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : 16.60                          
REMARK   3   MEAN B VALUE      (OVERALL, A**2) : 15.90                          
REMARK   3   OVERALL ANISOTROPIC B VALUE.                                       
REMARK   3    B11 (A**2) : 0.22000                                              
REMARK   3    B22 (A**2) : -0.70000                                             
REMARK   3    B33 (A**2) : 0.48000                                              
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): 0.077         
REMARK   3   ESU BASED ON FREE R VALUE                       (A): 0.069         
REMARK   3   ESU BASED ON MAXIMUM LIKELIHOOD                 (A): 0.033         
REMARK   3   ESU FOR B VALUES BASED ON MAXIMUM LIKELIHOOD (A**2): 0.775         
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES.                                   
REMARK   3   DISTANCE RESTRAINTS.                    RMS    SIGMA               
REMARK   3    BOND LENGTH                     (A) : NULL  ; NULL                
REMARK   3    ANGLE DISTANCE                  (A) : NULL  ; NULL                
REMARK   3    INTRAPLANAR 1-4 DISTANCE        (A) : NULL  ; NULL                
REMARK   3    H-BOND OR METAL COORDINATION    (A) : NULL  ; NULL                
REMARK   3                                                                      
REMARK   3   PLANE RESTRAINT                  (A) : NULL  ; NULL                
REMARK   3   CHIRAL-CENTER RESTRAINT       (A**3) : NULL  ; NULL                
REMARK   3                                                                      
REMARK   3   NON-BONDED CONTACT RESTRAINTS.                                     
REMARK   3    SINGLE TORSION                  (A) : NULL  ; NULL                
REMARK   3    MULTIPLE TORSION                (A) : NULL  ; NULL                
REMARK   3    H-BOND (X...Y)                  (A) : NULL  ; NULL                
REMARK   3    H-BOND (X-H...Y)                (A) : NULL  ; NULL                
REMARK   3                                                                      
REMARK   3   CONFORMATIONAL TORSION ANGLE RESTRAINTS.                           
REMARK   3    SPECIFIED                 (DEGREES) : NULL  ; NULL                
REMARK   3    PLANAR                    (DEGREES) : NULL  ; NULL                
REMARK   3    STAGGERED                 (DEGREES) : NULL  ; NULL                
REMARK   3    TRANSVERSE                (DEGREES) : NULL  ; NULL                
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL FACTOR RESTRAINTS.    RMS    SIGMA                
REMARK   3   MAIN-CHAIN BOND              (A**2) : NULL  ; NULL                 
REMARK   3   MAIN-CHAIN ANGLE             (A**2) : NULL  ; NULL                 
REMARK   3   SIDE-CHAIN BOND              (A**2) : NULL  ; NULL                 
REMARK   3   SIDE-CHAIN ANGLE             (A**2) : NULL  ; NULL                 
REMARK   3                                                                      
REMARK   3  OTHER REFINEMENT REMARKS: HYDROGENS HAVE BEEN ADDED IN THE RIDING   
REMARK   3  POSITIONS                                                           
REMARK   4                                                                      
REMARK   4 1OBD COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY PDBE ON 30-JAN-03.                  
REMARK 100 THE DEPOSITION ID IS D_1290012068.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 15-FEB-98                          
REMARK 200  TEMPERATURE           (KELVIN) : 100.0                              
REMARK 200  PH                             : 7.50                               
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                       : X11                                
REMARK 200  X-RAY GENERATOR MODEL          : NULL                               
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : 0.906                              
REMARK 200  MONOCHROMATOR                  : NULL                               
REMARK 200  OPTICS                         : NULL                               
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   : 59985                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 1.400                              
REMARK 200  RESOLUTION RANGE LOW       (A) : 30.000                             
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : NULL                               
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : 97.0                               
REMARK 200  DATA REDUNDANCY                : 3.500                              
REMARK 200  R MERGE                    (I) : 0.08500                            
REMARK 200  R SYM                      (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 17.0000                            
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.40                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 1.42                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 97.4                               
REMARK 200  DATA REDUNDANCY IN SHELL       : 3.50                               
REMARK 200  R MERGE FOR SHELL          (I) : 0.19000                            
REMARK 200  R SYM FOR SHELL            (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR SHELL         : 7.000                              
REMARK 200                                                                      
REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH                              
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT        
REMARK 200 SOFTWARE USED: NULL                                                  
REMARK 200 STARTING MODEL: PDB ENTRY 1A48                                       
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 44.80                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.20                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: THE HANGING DROPS CONTAINED PROTEIN AT   
REMARK 280  A CONCENTRATION OF 8 - 15 MG/ML, 50 MM TRIS-HCL BUFFER, PH 7.0,     
REMARK 280  40 MM ASPARTIC ACID AND 1.0 - 1.25 M AMMONIUM SULPHATE. THE WELL    
REMARK 280  CONTAINED THE SAME ABOVE BUFFER PLUS 2.25 M AMMONIUM SULPHATE,      
REMARK 280  PH 7.50, VAPOR DIFFUSION, HANGING DROP                              
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 21 21 21                       
REMARK 290                                                                      
REMARK 290      SYMOP   SYMMETRY                                                
REMARK 290     NNNMMM   OPERATOR                                                
REMARK 290       1555   X,Y,Z                                                   
REMARK 290       2555   -X+1/2,-Y,Z+1/2                                         
REMARK 290       3555   -X,Y+1/2,-Z+1/2                                         
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       30.74000            
REMARK 290   SMTRY2   2  0.000000 -1.000000  0.000000        0.00000            
REMARK 290   SMTRY3   2  0.000000  0.000000  1.000000       39.91000            
REMARK 290   SMTRY1   3 -1.000000  0.000000  0.000000        0.00000            
REMARK 290   SMTRY2   3  0.000000  1.000000  0.000000       31.52500            
REMARK 290   SMTRY3   3  0.000000  0.000000 -1.000000       39.91000            
REMARK 290   SMTRY1   4  1.000000  0.000000  0.000000       30.74000            
REMARK 290   SMTRY2   4  0.000000 -1.000000  0.000000       31.52500            
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 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     GLU A   166                                                      
REMARK 465     GLN A   167                                                      
REMARK 465     GLY A   168                                                      
REMARK 465     GLU A   169                                                      
REMARK 465     HIS A   170                                                      
REMARK 465     SER A   305                                                      
REMARK 465     HIS A   306                                                      
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  131   CD   CE   NZ                                        
REMARK 480     LYS A  135   CG   CD   CE                                        
REMARK 480     LYS A  143   NZ                                                  
REMARK 480     LYS A  303   CD   CE   NZ                                        
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   NZ   LYS A   303     O    HOH A  2502              0.64            
REMARK 500   CE   LYS A   303     O    HOH A  2502              0.88            
REMARK 500   CD   LYS A   303     O    HOH A  2502              2.09            
REMARK 500   CD   LYS A   131     O    HOH A  2267              2.13            
REMARK 500   O    HOH A  2240     O    HOH A  2243              2.18            
REMARK 500   OE1  GLU A   156     O    HOH A  2309              2.19            
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 135   CB    LYS A 135   CG     -0.173                       
REMARK 500    LYS A 135   CE    LYS A 135   NZ      1.984                       
REMARK 500    LYS A 143   CE    LYS A 143   NZ     -0.449                       
REMARK 500    LYS A 303   CG    LYS A 303   CD     -0.359                       
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  17   NE  -  CZ  -  NH1 ANGL. DEV. =  -3.7 DEGREES          
REMARK 500    ARG A  17   NE  -  CZ  -  NH2 ANGL. DEV. =   3.6 DEGREES          
REMARK 500    ASP A  22   CB  -  CG  -  OD2 ANGL. DEV. =   6.2 DEGREES          
REMARK 500    ASP A  43   CB  -  CG  -  OD2 ANGL. DEV. =   6.0 DEGREES          
REMARK 500    ASP A  78   CB  -  CA  -  C   ANGL. DEV. =  17.4 DEGREES          
REMARK 500    ASP A  78   CB  -  CA  -  C   ANGL. DEV. = -16.3 DEGREES          
REMARK 500    ASP A  78   CB  -  CG  -  OD2 ANGL. DEV. =   6.0 DEGREES          
REMARK 500    LYS A 135   CA  -  CB  -  CG  ANGL. DEV. =  13.9 DEGREES          
REMARK 500    LYS A 135   CD  -  CE  -  NZ  ANGL. DEV. = -16.0 DEGREES          
REMARK 500    LYS A 135   CD  -  CE  -  NZ  ANGL. DEV. = -41.9 DEGREES          
REMARK 500    LYS A 143   CD  -  CE  -  NZ  ANGL. DEV. =  22.1 DEGREES          
REMARK 500    ASP A 259   CB  -  CG  -  OD2 ANGL. DEV. =   7.6 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    ASP A 104       -4.97     72.25                                   
REMARK 500    VAL A 232     -167.74   -127.62                                   
REMARK 500    ASP A 233     -149.50     54.19                                   
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 A2007        DISTANCE =  6.72 ANGSTROMS                       
REMARK 525    HOH A2008        DISTANCE =  7.10 ANGSTROMS                       
REMARK 525    HOH A2017        DISTANCE =  5.92 ANGSTROMS                       
REMARK 525    HOH A2027        DISTANCE =  6.66 ANGSTROMS                       
REMARK 525    HOH A2060        DISTANCE =  6.52 ANGSTROMS                       
REMARK 525    HOH A2127        DISTANCE =  6.08 ANGSTROMS                       
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                              MG A 311  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 SER A  61   OG                                                     
REMARK 620 2 SER A  61   OG   38.2                                              
REMARK 620 3 GLU A 234   OE2 140.2 110.2                                        
REMARK 620 4 VAL A 235   N    81.8  93.5 133.5                                  
REMARK 620 5 HOH A2150   O    65.6  88.8  98.6 122.0                            
REMARK 620 N                    1     2     3     4                             
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG A 310  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 ATP A 307   O2A                                                    
REMARK 620 2 ATP A 307   O2G  92.3                                              
REMARK 620 3 ATP A 307   O2B  85.0  88.0                                        
REMARK 620 4 HOH A2397   O    91.1 176.3  93.6                                  
REMARK 620 N                    1     2     3                                   
REMARK 700                                                                      
REMARK 700 SHEET                                                                
REMARK 700 THE SHEET STRUCTURE OF THIS MOLECULE IS BIFURCATED. IN               
REMARK 700 ORDER TO REPRESENT THIS FEATURE IN THE SHEET RECORDS BELOW,          
REMARK 700 TWO SHEETS ARE DEFINED.                                              
REMARK 800                                                                      
REMARK 800 SITE                                                                 
REMARK 800 SITE_IDENTIFIER: AC1                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE SO4 A 308                 
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC2                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE SO4 A 309                 
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC3                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 310                  
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC4                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 311                  
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC5                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ATP A 307                 
REMARK 800                                                                      
REMARK 800 SITE_IDENTIFIER: AC6                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE AMP A 315                 
REMARK 900                                                                      
REMARK 900 RELATED ENTRIES                                                      
REMARK 900 RELATED ID: 1A48   RELATED DB: PDB                                   
REMARK 900 SAICAR SYNTHASE                                                      
DBREF  1OBD A    2   306  UNP    P27616   PUR7_YEAST       2    306             
SEQRES   1 A  306  ACE SER ILE THR LYS THR GLU LEU ASP GLY ILE LEU PRO          
SEQRES   2 A  306  LEU VAL ALA ARG GLY LYS VAL ARG ASP ILE TYR GLU VAL          
SEQRES   3 A  306  ASP ALA GLY THR LEU LEU PHE VAL ALA THR ASP ARG ILE          
SEQRES   4 A  306  SER ALA TYR ASP VAL ILE MET GLU ASN SER ILE PRO GLU          
SEQRES   5 A  306  LYS GLY ILE LEU LEU THR LYS LEU SER GLU PHE TRP PHE          
SEQRES   6 A  306  LYS PHE LEU SER ASN ASP VAL ARG ASN HIS LEU VAL ASP          
SEQRES   7 A  306  ILE ALA PRO GLY LYS THR ILE PHE ASP TYR LEU PRO ALA          
SEQRES   8 A  306  LYS LEU SER GLU PRO LYS TYR LYS THR GLN LEU GLU ASP          
SEQRES   9 A  306  ARG SER LEU LEU VAL HIS LYS HIS LYS LEU ILE PRO LEU          
SEQRES  10 A  306  GLU VAL ILE VAL ARG GLY TYR ILE THR GLY SER ALA TRP          
SEQRES  11 A  306  LYS GLU TYR VAL LYS THR GLY THR VAL HIS GLY LEU LYS          
SEQRES  12 A  306  GLN PRO GLN GLY LEU LYS GLU SER GLN GLU PHE PRO GLU          
SEQRES  13 A  306  PRO ILE PHE THR PRO SER THR LYS ALA GLU GLN GLY GLU          
SEQRES  14 A  306  HIS ASP GLU ASN ILE SER PRO ALA GLN ALA ALA GLU LEU          
SEQRES  15 A  306  VAL GLY GLU ASP LEU SER ARG ARG VAL ALA GLU LEU ALA          
SEQRES  16 A  306  VAL LYS LEU TYR SER LYS CYS LYS ASP TYR ALA LYS GLU          
SEQRES  17 A  306  LYS GLY ILE ILE ILE ALA ASP THR LYS PHE GLU PHE GLY          
SEQRES  18 A  306  ILE ASP GLU LYS THR ASN GLU ILE ILE LEU VAL ASP GLU          
SEQRES  19 A  306  VAL LEU THR PRO ASP SER SER ARG PHE TRP ASN GLY ALA          
SEQRES  20 A  306  SER TYR LYS VAL GLY GLU SER GLN ASP SER TYR ASP LYS          
SEQRES  21 A  306  GLN PHE LEU ARG ASP TRP LEU THR ALA ASN LYS LEU ASN          
SEQRES  22 A  306  GLY VAL ASN GLY VAL LYS MET PRO GLN ASP ILE VAL ASP          
SEQRES  23 A  306  ARG THR ARG ALA LYS TYR ILE GLU ALA TYR GLU THR LEU          
SEQRES  24 A  306  THR GLY SER LYS TRP SER HIS                                  
HET    ACE  A   1       3                                                       
HET    ATP  A 307      31                                                       
HET    SO4  A 308       5                                                       
HET    SO4  A 309       5                                                       
HET     MG  A 310       1                                                       
HET     MG  A 311       1                                                       
HET    AMP  A 315      23                                                       
HETNAM     ACE ACETYL GROUP                                                     
HETNAM     ATP ADENOSINE-5'-TRIPHOSPHATE                                        
HETNAM     SO4 SULFATE ION                                                      
HETNAM      MG MAGNESIUM ION                                                    
HETNAM     AMP ADENOSINE MONOPHOSPHATE                                          
FORMUL   1  ACE    C2 H4 O                                                      
FORMUL   2  ATP    C10 H16 N5 O13 P3                                            
FORMUL   3  SO4    2(O4 S 2-)                                                   
FORMUL   5   MG    2(MG 2+)                                                     
FORMUL   7  AMP    C10 H14 N5 O7 P                                              
FORMUL   8  HOH   *526(H2 O)                                                    
HELIX    1   1 GLU A   52  LEU A   68  1                                  17    
HELIX    2   2 THR A   84  LEU A   89  5                                   6    
HELIX    3   3 PRO A   90  SER A   94  5                                   5    
HELIX    4   4 GLU A   95  GLU A  103  1                                   9    
HELIX    5   5 THR A  126  GLY A  137  1                                  12    
HELIX    6   6 SER A  175  GLY A  184  1                                  10    
HELIX    7   7 GLY A  184  LYS A  209  1                                  26    
HELIX    8   8 LYS A  260  ASN A  270  1                                  11    
HELIX    9   9 PRO A  281  GLY A  301  1                                  21    
SHEET    1  AA 4 LEU A  14  ARG A  17  0                                        
SHEET    2  AA 4 ARG A  21  ASP A  27 -1  O  ILE A  23   N  VAL A  15           
SHEET    3  AA 4 THR A  30  ALA A  35 -1  O  THR A  30   N  VAL A  26           
SHEET    4  AA 4 SER A 106  HIS A 110 -1  O  LEU A 107   N  PHE A  33           
SHEET    1  AB 2 SER A  40  ALA A  41  0                                        
SHEET    2  AB 2 VAL A  44  ILE A  45 -1  O  VAL A  44   N  ALA A  41           
SHEET    1  AC 4 LYS A 113  LEU A 114  0                                        
SHEET    2  AC 4 GLU A 228  VAL A 232  0                                        
SHEET    3  AC 4 ILE A 211  ASP A 223 -1  O  GLU A 219   N  VAL A 232           
SHEET    4  AC 4 LYS A 113  LEU A 114 -1  O  LYS A 113   N  ILE A 222           
SHEET    1  AD 5 ARG A  73  ASN A  74  0                                        
SHEET    2  AD 5 GLU A 228  VAL A 232  1  O  ILE A 229   N  ARG A  73           
SHEET    3  AD 5 ILE A 211  ASP A 223 -1  O  GLU A 219   N  VAL A 232           
SHEET    4  AD 5 VAL A 119  TYR A 124 -1  O  VAL A 119   N  PHE A 218           
SHEET    5  AD 5 GLU A 153  PHE A 159 -1  N  PHE A 154   O  GLY A 123           
SHEET    1  AE 2 THR A 138  VAL A 139  0                                        
SHEET    2  AE 2 LEU A 142  LYS A 143 -1  O  LEU A 142   N  VAL A 139           
SHEET    1  AF 2 SER A 162  THR A 163  0                                        
SHEET    2  AF 2 GLU A 172  ASN A 173 -1  O  GLU A 172   N  THR A 163           
LINK         C   ACE A   1                 N   SER A   2     1555   1555  1.31  
LINK         OG BSER A  61                MG    MG A 311     1555   1555  2.36  
LINK         OG ASER A  61                MG    MG A 311     1555   1555  2.06  
LINK         OE2 GLU A 234                MG    MG A 311     1555   1555  2.19  
LINK         N   VAL A 235                MG    MG A 311     1555   1555  2.76  
LINK         O2A ATP A 307                MG    MG A 310     1555   1555  2.02  
LINK         O2G ATP A 307                MG    MG A 310     1555   1555  1.99  
LINK         O2B ATP A 307                MG    MG A 310     1555   1555  2.18  
LINK        MG    MG A 310                 O   HOH A2397     1555   1555  1.92  
LINK        MG    MG A 311                 O   HOH A2150     1555   1555  2.67  
SITE     1 AC1  6 ARG A 122  GLY A 127  SER A 128  ARG A 242                    
SITE     2 AC1  6 HOH A2323  HOH A2519                                          
SITE     1 AC2  9 ARG A  73  ASN A  74  ASP A  78  HIS A 110                    
SITE     2 AC2  9 HOH A2183  HOH A2520  HOH A2521  HOH A2522                    
SITE     3 AC2  9 HOH A2523                                                     
SITE     1 AC3  2 ATP A 307  HOH A2397                                          
SITE     1 AC4  4 SER A  61  GLU A 234  VAL A 235  HOH A2150                    
SITE     1 AC5 25 GLY A  18  LYS A  19  ARG A  21  ILE A  23                    
SITE     2 AC5 25 LEU A  31  PHE A  33  HIS A  75  HIS A 110                    
SITE     3 AC5 25 HIS A 112  LYS A 143  GLU A 219  VAL A 232                    
SITE     4 AC5 25 ASP A 233   MG A 310  HOH A2397  HOH A2508                    
SITE     5 AC5 25 HOH A2509  HOH A2510  HOH A2511  HOH A2512                    
SITE     6 AC5 25 HOH A2513  HOH A2514  HOH A2515  HOH A2516                    
SITE     7 AC5 25 HOH A2517                                                     
SITE     1 AC6 10 GLU A  62  VAL A  77  ILE A  79  ILE A  85                    
SITE     2 AC6 10 SER A 106  LEU A 107  LEU A 108  HOH A2524                    
SITE     3 AC6 10 HOH A2525  HOH A2526                                          
CRYST1   61.480   63.050   79.820  90.00  90.00  90.00 P 21 21 21    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      0.016265  0.000000  0.000000        0.00000                         
SCALE2      0.000000  0.015860  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.012528        0.00000                         
HETATM    1  C   ACE A   1      16.511  44.922  -3.042  1.00 20.87           C  
ANISOU    1  C   ACE A   1     2727   2471   2728   -123      0     95       C  
HETATM    2  O   ACE A   1      16.539  44.168  -2.048  1.00 23.37           O  
ANISOU    2  O   ACE A   1     3173   2709   2997   -204     28    101       O  
HETATM    3  CH3 ACE A   1      17.333  46.193  -3.142  1.00 22.17           C  
ANISOU    3  CH3 ACE A   1     2833   2663   2926   -287     32     59       C