HEADER    TRANSFERASE                             30-JAN-01   1I13              
TITLE     ANALYSIS OF AN INVARIANT ASPARTIC ACID IN HPRTS-ALANINE MUTANT        
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE;            
COMPND   3 CHAIN: A, B;                                                         
COMPND   4 EC: 2.4.2.8;                                                         
COMPND   5 ENGINEERED: YES;                                                     
COMPND   6 MUTATION: YES                                                        
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: TRYPANOSOMA CRUZI;                              
SOURCE   3 ORGANISM_TAXID: 5693;                                                
SOURCE   4 EXPRESSION_SYSTEM: ESCHERICHIA COLI;                                 
SOURCE   5 EXPRESSION_SYSTEM_TAXID: 562                                         
KEYWDS    PHOSPHORIBOSYLTRANSFERASE, NUCLEOTIDE METABOLISM, PURINE SALVAGE,     
KEYWDS   2 TERNARY COMPLEX, CATALYTIC BASE, TRANSFERASE                         
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    B.CANYUK,P.J.FOCIA,A.E.EAKIN                                          
REVDAT   7   09-AUG-23 1I13    1       REMARK                                   
REVDAT   6   27-OCT-21 1I13    1       SEQADV HETSYN                            
REVDAT   5   29-JUL-20 1I13    1       COMPND REMARK HETNAM LINK                
REVDAT   5 2                   1       SITE                                     
REVDAT   4   24-FEB-09 1I13    1       VERSN                                    
REVDAT   3   01-APR-03 1I13    1       JRNL                                     
REVDAT   2   05-JUN-02 1I13    1       REMARK SEQADV                            
REVDAT   1   29-MAY-02 1I13    0                                                
JRNL        AUTH   B.CANYUK,P.J.FOCIA,A.E.EAKIN                                 
JRNL        TITL   THE ROLE FOR AN INVARIANT ASPARTIC ACID IN HYPOXANTHINE      
JRNL        TITL 2 PHOSPHORIBOSYLTRANSFERASES IS EXAMINED USING SATURATION      
JRNL        TITL 3 MUTAGENESIS, FUNCTIONAL ANALYSIS, AND X-RAY CRYSTALLOGRAPHY. 
JRNL        REF    BIOCHEMISTRY                  V.  40  2754 2001              
JRNL        REFN                   ISSN 0006-2960                               
JRNL        PMID   11258886                                                     
JRNL        DOI    10.1021/BI001195Q                                            
REMARK   1                                                                      
REMARK   1 REFERENCE 1                                                          
REMARK   1  AUTH   P.J.FOCIA,S.P.CRAIG,A.E.EAKIN                                
REMARK   1  TITL   APPROACHING THE TRANSITION STATE IN THE CRYSTAL STRUCTURE OF 
REMARK   1  TITL 2 A PHOSPHORIBOSYLTRANSFERASE                                  
REMARK   1  REF    BIOCHEMISTRY                  V.  37 17120 1998              
REMARK   1  REFN                   ISSN 0006-2960                               
REMARK   1  DOI    10.1021/BI9821465                                            
REMARK   2                                                                      
REMARK   2 RESOLUTION.    1.84 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : X-PLOR 3.851                                         
REMARK   3   AUTHORS     : BRUNGER                                              
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 1.84                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 6.00                           
REMARK   3   DATA CUTOFF            (SIGMA(F)) : 2.000                          
REMARK   3   DATA CUTOFF HIGH         (ABS(F)) : NULL                           
REMARK   3   DATA CUTOFF LOW          (ABS(F)) : NULL                           
REMARK   3   COMPLETENESS (WORKING+TEST)   (%) : 95.8                           
REMARK   3   NUMBER OF REFLECTIONS             : 29126                          
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) : 0.192                           
REMARK   3   FREE R VALUE                     : 0.252                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : 7.100                           
REMARK   3   FREE R VALUE TEST SET COUNT      : 2082                            
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           : 15                           
REMARK   3   BIN RESOLUTION RANGE HIGH       (A) : 1.80                         
REMARK   3   BIN RESOLUTION RANGE LOW        (A) : 1.84                         
REMARK   3   BIN COMPLETENESS (WORKING+TEST) (%) : 93.70                        
REMARK   3   REFLECTIONS IN BIN    (WORKING SET) : 1340                         
REMARK   3   BIN R VALUE           (WORKING SET) : 0.2710                       
REMARK   3   BIN FREE R VALUE                    : 0.3180                       
REMARK   3   BIN FREE R VALUE TEST SET SIZE  (%) : 7.90                         
REMARK   3   BIN FREE R VALUE TEST SET COUNT     : 116                          
REMARK   3   ESTIMATED ERROR OF BIN FREE R VALUE : NULL                         
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 2979                                    
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 71                                      
REMARK   3   SOLVENT ATOMS            : 178                                     
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : NULL                           
REMARK   3   MEAN B VALUE      (OVERALL, A**2) : NULL                           
REMARK   3   OVERALL ANISOTROPIC B VALUE.                                       
REMARK   3    B11 (A**2) : NULL                                                 
REMARK   3    B22 (A**2) : NULL                                                 
REMARK   3    B33 (A**2) : NULL                                                 
REMARK   3    B12 (A**2) : NULL                                                 
REMARK   3    B13 (A**2) : NULL                                                 
REMARK   3    B23 (A**2) : NULL                                                 
REMARK   3                                                                      
REMARK   3  ESTIMATED COORDINATE ERROR.                                         
REMARK   3   ESD FROM LUZZATI PLOT        (A) : NULL                            
REMARK   3   ESD FROM SIGMAA              (A) : NULL                            
REMARK   3   LOW RESOLUTION CUTOFF        (A) : NULL                            
REMARK   3                                                                      
REMARK   3  CROSS-VALIDATED ESTIMATED COORDINATE ERROR.                         
REMARK   3   ESD FROM C-V LUZZATI PLOT    (A) : NULL                            
REMARK   3   ESD FROM C-V SIGMAA          (A) : NULL                            
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES.                                   
REMARK   3   BOND LENGTHS                 (A) : 0.011                           
REMARK   3   BOND ANGLES            (DEGREES) : 1.570                           
REMARK   3   DIHEDRAL ANGLES        (DEGREES) : NULL                            
REMARK   3   IMPROPER ANGLES        (DEGREES) : NULL                            
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) : 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  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  : PARHCSDX.PRO                                   
REMARK   3  PARAMETER FILE  2  : PARAM11X.DNA                                   
REMARK   3  PARAMETER FILE  3  : PRPP.PAR                                       
REMARK   3  PARAMETER FILE  4  : PARAM19.ION                                    
REMARK   3  PARAMETER FILE  5  : PARAM11.WAT                                    
REMARK   3  PARAMETER FILE  6  : NULL                                           
REMARK   3  TOPOLOGY FILE  1   : TOPHCSDX.PRO                                   
REMARK   3  TOPOLOGY FILE  2   : TOPH11.DNA                                     
REMARK   3  TOPOLOGY FILE  3   : PRPP.TOP                                       
REMARK   3  TOPOLOGY FILE  4   : TOPH19.ION                                     
REMARK   3  TOPOLOGY FILE  5   : TOPH11.WAT                                     
REMARK   3  TOPOLOGY FILE  6   : NULL                                           
REMARK   3                                                                      
REMARK   3  OTHER REFINEMENT REMARKS: PATCH STATEMENTS WERE USED FOR CIS        
REMARK   3  PEPTIDES AND METAL-OXYGEN BONDS                                     
REMARK   4                                                                      
REMARK   4 1I13 COMPLIES WITH FORMAT V. 3.30, 13-JUL-11                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 07-MAR-01.                  
REMARK 100 THE DEPOSITION ID IS D_1000012774.                                   
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 21-APR-99                          
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                       : X12B                               
REMARK 200  X-RAY GENERATOR MODEL          : NULL                               
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M                                  
REMARK 200  WAVELENGTH OR RANGE        (A) : 1.0                                
REMARK 200  MONOCHROMATOR                  : SI 111 CHANNEL                     
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   : 36405                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 1.840                              
REMARK 200  RESOLUTION RANGE LOW       (A) : 30.000                             
REMARK 200  REJECTION CRITERIA  (SIGMA(I)) : -3.000                             
REMARK 200                                                                      
REMARK 200 OVERALL.                                                             
REMARK 200  COMPLETENESS FOR RANGE     (%) : 95.8                               
REMARK 200  DATA REDUNDANCY                : 2.300                              
REMARK 200  R MERGE                    (I) : 0.05600                            
REMARK 200  R SYM                      (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 13.7000                            
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.80                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 1.84                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 92.5                               
REMARK 200  DATA REDUNDANCY IN SHELL       : 2.20                               
REMARK 200  R MERGE FOR SHELL          (I) : 0.49000                            
REMARK 200  R SYM FOR SHELL            (I) : NULL                               
REMARK 200  <I/SIGMA(I)> FOR SHELL         : 2.300                              
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 1TC2 WITH LIGANDS, WATER MOLECULES AND     
REMARK 200  LOOP II REMOVED                                                     
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 40.06                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.05                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: PEG 6000, SODIUM ACETATE, AMMONIUM       
REMARK 280  ACETATE, PH 4.6, VAPOR DIFFUSION, HANGING DROP                      
REMARK 290                                                                      
REMARK 290 CRYSTALLOGRAPHIC SYMMETRY                                            
REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 1 21 1                         
REMARK 290                                                                      
REMARK 290      SYMOP   SYMMETRY                                                
REMARK 290     NNNMMM   OPERATOR                                                
REMARK 290       1555   X,Y,Z                                                   
REMARK 290       2555   -X,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       51.12500            
REMARK 290   SMTRY3   2  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: DIMERIC                           
REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: DIMERIC                    
REMARK 350 SOFTWARE USED: PISA                                                  
REMARK 350 TOTAL BURIED SURFACE AREA: 5740 ANGSTROM**2                          
REMARK 350 SURFACE AREA OF THE COMPLEX: 15060 ANGSTROM**2                       
REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -70.0 KCAL/MOL                        
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B                                  
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     MET A     1                                                      
REMARK 465     PRO A     2                                                      
REMARK 465     ARG A     3                                                      
REMARK 465     GLU A     4                                                      
REMARK 465     GLU A   192                                                      
REMARK 465     ARG A   193                                                      
REMARK 465     GLU A   194                                                      
REMARK 465     ALA A   195                                                      
REMARK 465     ALA A   196                                                      
REMARK 465     ARG A   197                                                      
REMARK 465     GLY A   198                                                      
REMARK 465     LYS A   199                                                      
REMARK 465     LYS A   200                                                      
REMARK 465     GLN A   201                                                      
REMARK 465     ARG A   202                                                      
REMARK 465     ALA A   203                                                      
REMARK 465     ILE A   204                                                      
REMARK 465     GLY A   205                                                      
REMARK 465     SER A   206                                                      
REMARK 465     ALA A   207                                                      
REMARK 465     ASP A   208                                                      
REMARK 465     THR A   209                                                      
REMARK 465     ASP A   210                                                      
REMARK 465     ARG A   211                                                      
REMARK 465     ASP A   212                                                      
REMARK 465     ALA A   213                                                      
REMARK 465     LYS A   214                                                      
REMARK 465     ARG A   215                                                      
REMARK 465     GLU A   216                                                      
REMARK 465     PHE A   217                                                      
REMARK 465     HIS A   218                                                      
REMARK 465     SER A   219                                                      
REMARK 465     LYS A   220                                                      
REMARK 465     TYR A   221                                                      
REMARK 465     MET B     1                                                      
REMARK 465     PRO B     2                                                      
REMARK 465     ARG B     3                                                      
REMARK 465     GLU B     4                                                      
REMARK 465     GLY B   198                                                      
REMARK 465     LYS B   199                                                      
REMARK 465     LYS B   200                                                      
REMARK 465     GLN B   201                                                      
REMARK 465     ARG B   202                                                      
REMARK 465     ALA B   203                                                      
REMARK 465     ILE B   204                                                      
REMARK 465     GLY B   205                                                      
REMARK 465     SER B   206                                                      
REMARK 465     ALA B   207                                                      
REMARK 465     ASP B   208                                                      
REMARK 465     THR B   209                                                      
REMARK 465     ASP B   210                                                      
REMARK 465     ARG B   211                                                      
REMARK 465     ASP B   212                                                      
REMARK 465     ALA B   213                                                      
REMARK 465     LYS B   214                                                      
REMARK 465     ARG B   215                                                      
REMARK 465     GLU B   216                                                      
REMARK 465     PHE B   217                                                      
REMARK 465     HIS B   218                                                      
REMARK 465     SER B   219                                                      
REMARK 465     LYS B   220                                                      
REMARK 465     TYR B   221                                                      
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     GLU A   6    CG   CD   OE1  OE2                                  
REMARK 470     LYS A  23    CG   CD   CE   NZ                                   
REMARK 470     LYS A  27    CG   CD   CE   NZ                                   
REMARK 470     LYS A  34    CG   CD   CE   NZ                                   
REMARK 470     ARG A  39    CG   CD   NE   CZ   NH1  NH2                        
REMARK 470     GLU A  84    CG   CD   OE1  OE2                                  
REMARK 470     ARG A  99    CG   CD   NE   CZ   NH1  NH2                        
REMARK 470     ARG A 131    CG   CD   NE   CZ   NH1  NH2                        
REMARK 470     GLU A 188    CG   CD   OE1  OE2                                  
REMARK 470     TYR A 190    CG   CD1  CD2  CE1  CE2  CZ   OH                    
REMARK 470     GLU B   6    CG   CD   OE1  OE2                                  
REMARK 470     LYS B  23    CG   CD   CE   NZ                                   
REMARK 470     ARG B  28    CG   CD   NE   CZ   NH1  NH2                        
REMARK 470     LYS B  34    CG   CD   CE   NZ                                   
REMARK 470     ARG B  39    CG   CD   NE   CZ   NH1  NH2                        
REMARK 470     ARG B  99    CG   CD   NE   CZ   NH1  NH2                        
REMARK 470     ARG B 131    CG   CD   NE   CZ   NH1  NH2                        
REMARK 470     GLU B 188    CG   CD   OE1  OE2                                  
REMARK 470     ARG B 197    CG   CD   NE   CZ   NH1  NH2                        
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    TYR A  41      -60.03     67.99                                   
REMARK 500    SER A  88        4.03   -150.36                                   
REMARK 500    ALA A 115      -81.70   -133.38                                   
REMARK 500    TYR B  41      -56.98     72.37                                   
REMARK 500    ASN B  43       56.36   -147.43                                   
REMARK 500    SER B  81      -43.19   -150.61                                   
REMARK 500    ALA B 115      -92.10   -121.60                                   
REMARK 500    ALA B 196       11.13    -62.29                                   
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
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 902  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 ASP A 171   OD1                                                    
REMARK 620 2 PRP A 801   O1B  86.8                                              
REMARK 620 3 PRP A 801   O2A 166.4  80.5                                        
REMARK 620 4 HOH A5504   O    91.3  89.9  93.3                                  
REMARK 620 5 HOH A5505   O    92.0 177.9 100.9  88.5                            
REMARK 620 6 HOH A5506   O    87.3  93.4  88.8 176.3  88.2                      
REMARK 620 N                    1     2     3     4     5                       
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG A 900  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 PRP A 801   O3                                                     
REMARK 620 2 PRP A 801   O1   62.3                                              
REMARK 620 3 PRP A 801   O2   83.6  62.4                                        
REMARK 620 4 PRP A 801   O3B 140.0  77.9  82.2                                  
REMARK 620 5 HOH A5502   O   117.5 167.2 104.9 102.3                            
REMARK 620 6 HOH A5503   O    78.9  88.2 150.3  96.0 104.5                      
REMARK 620 N                    1     2     3     4     5                       
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG B 912  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 ASP B 171   OD1                                                    
REMARK 620 2 PRP B 811   O2A 167.8                                              
REMARK 620 3 PRP B 811   O1B  80.1  88.3                                        
REMARK 620 4 HOH B5507   O    88.1  95.6  89.9                                  
REMARK 620 5 HOH B5508   O    86.6 105.1 166.6  87.8                            
REMARK 620 6 HOH B5509   O    84.7  92.4  93.7 171.3  86.9                      
REMARK 620 N                    1     2     3     4     5                       
REMARK 620                                                                      
REMARK 620 COORDINATION ANGLES FOR:  M RES CSSEQI METAL                         
REMARK 620                              MG B 910  MG                            
REMARK 620 N RES CSSEQI ATOM                                                    
REMARK 620 1 PRP B 811   O3                                                     
REMARK 620 2 PRP B 811   O2   73.8                                              
REMARK 620 3 PRP B 811   O3B 159.1  92.8                                        
REMARK 620 4 PRP B 811   O1   75.1  68.7  85.2                                  
REMARK 620 5 HOH B5510   O    98.2  95.7  99.0 164.1                            
REMARK 620 6 HOH B5511   O    91.1 159.5  97.3  94.4 100.2                      
REMARK 620 N                    1     2     3     4     5                       
REMARK 900                                                                      
REMARK 900 RELATED ENTRIES                                                      
REMARK 900 RELATED ID: 1TC2   RELATED DB: PDB                                   
REMARK 900 TERNARY SUBSTRATES COMPLEX OF THE WILD TYPE HPRT FROM TRYPANOSOMA    
REMARK 900 CRUZI                                                                
REMARK 900 RELATED ID: 1TC1   RELATED DB: PDB                                   
REMARK 900 ORIGINAL STRUCTURE OF THE HPRT FROM TRYPANOSOMA CRUZI                
REMARK 900 RELATED ID: 1I0L   RELATED DB: PDB                                   
REMARK 900 ANALYSIS OF AN INVARIANT ASPARTIC ACID IN HPRTS - ASPARAGINE MUTANT  
REMARK 900 RELATED ID: 1I0I   RELATED DB: PDB                                   
REMARK 900 ANALYSIS OF AN INVARIANT ASPARTIC ACID IN HPRTS - GLUTAMINE MUTANT   
REMARK 900 RELATED ID: 1I14   RELATED DB: PDB                                   
REMARK 900 ANALYSIS OF AN INVARIANT ASPARTIC ACID IN HPRTS - GLUTAMIC ACID      
REMARK 900 MUTANT                                                               
REMARK 999                                                                      
REMARK 999 SEQUENCE                                                             
REMARK 999 THIS HPRT WAS CLONED FROM A DIFFERENT STRAIN OF                      
REMARK 999 TRYPANOSOMA CRUZI AND VARIES FROM A PREVIOUSLY                       
REMARK 999 REPORTED SEQUENCE AT LYS 23, CYS 66 AND LEU 86.                      
DBREF  1I13 A    1   221  UNP    Q27796   Q27796_TRYCR     1    221             
DBREF  1I13 B    1   221  UNP    Q27796   Q27796_TRYCR     1    221             
SEQADV 1I13 LYS A   23  UNP  Q27796    MET    23 SEE REMARK 999                 
SEQADV 1I13 CYS A   66  UNP  Q27796    SER    66 SEE REMARK 999                 
SEQADV 1I13 LEU A   86  UNP  Q27796    VAL    86 SEE REMARK 999                 
SEQADV 1I13 ALA A  115  UNP  Q27796    ASP   115 ENGINEERED MUTATION            
SEQADV 1I13 LYS B   23  UNP  Q27796    MET    23 SEE REMARK 999                 
SEQADV 1I13 CYS B   66  UNP  Q27796    SER    66 SEE REMARK 999                 
SEQADV 1I13 LEU B   86  UNP  Q27796    VAL    86 SEE REMARK 999                 
SEQADV 1I13 ALA B  115  UNP  Q27796    ASP   115 ENGINEERED MUTATION            
SEQRES   1 A  221  MET PRO ARG GLU TYR GLU PHE ALA GLU LYS ILE LEU PHE          
SEQRES   2 A  221  THR GLU GLU GLU ILE ARG THR ARG ILE LYS GLU VAL ALA          
SEQRES   3 A  221  LYS ARG ILE ALA ASP ASP TYR LYS GLY LYS GLY LEU ARG          
SEQRES   4 A  221  PRO TYR VAL ASN PRO LEU VAL LEU ILE SER VAL LEU LYS          
SEQRES   5 A  221  GLY SER PHE MET PHE THR ALA ASP LEU CYS ARG ALA LEU          
SEQRES   6 A  221  CYS ASP PHE ASN VAL PRO VAL ARG MET GLU PHE ILE CYS          
SEQRES   7 A  221  VAL SER SER TYR GLY GLU GLY LEU THR SER SER GLY GLN          
SEQRES   8 A  221  VAL ARG MET LEU LEU ASP THR ARG HIS SER ILE GLU GLY          
SEQRES   9 A  221  HIS HIS VAL LEU ILE VAL GLU ASP ILE VAL ALA THR ALA          
SEQRES  10 A  221  LEU THR LEU ASN TYR LEU TYR HIS MET TYR PHE THR ARG          
SEQRES  11 A  221  ARG PRO ALA SER LEU LYS THR VAL VAL LEU LEU ASP LYS          
SEQRES  12 A  221  ARG GLU GLY ARG ARG VAL PRO PHE SER ALA ASP TYR VAL          
SEQRES  13 A  221  VAL ALA ASN ILE PRO ASN ALA PHE VAL ILE GLY TYR GLY          
SEQRES  14 A  221  LEU ASP TYR ASP ASP THR TYR ARG GLU LEU ARG ASP ILE          
SEQRES  15 A  221  VAL VAL LEU ARG PRO GLU VAL TYR ALA GLU ARG GLU ALA          
SEQRES  16 A  221  ALA ARG GLY LYS LYS GLN ARG ALA ILE GLY SER ALA ASP          
SEQRES  17 A  221  THR ASP ARG ASP ALA LYS ARG GLU PHE HIS SER LYS TYR          
SEQRES   1 B  221  MET PRO ARG GLU TYR GLU PHE ALA GLU LYS ILE LEU PHE          
SEQRES   2 B  221  THR GLU GLU GLU ILE ARG THR ARG ILE LYS GLU VAL ALA          
SEQRES   3 B  221  LYS ARG ILE ALA ASP ASP TYR LYS GLY LYS GLY LEU ARG          
SEQRES   4 B  221  PRO TYR VAL ASN PRO LEU VAL LEU ILE SER VAL LEU LYS          
SEQRES   5 B  221  GLY SER PHE MET PHE THR ALA ASP LEU CYS ARG ALA LEU          
SEQRES   6 B  221  CYS ASP PHE ASN VAL PRO VAL ARG MET GLU PHE ILE CYS          
SEQRES   7 B  221  VAL SER SER TYR GLY GLU GLY LEU THR SER SER GLY GLN          
SEQRES   8 B  221  VAL ARG MET LEU LEU ASP THR ARG HIS SER ILE GLU GLY          
SEQRES   9 B  221  HIS HIS VAL LEU ILE VAL GLU ASP ILE VAL ALA THR ALA          
SEQRES  10 B  221  LEU THR LEU ASN TYR LEU TYR HIS MET TYR PHE THR ARG          
SEQRES  11 B  221  ARG PRO ALA SER LEU LYS THR VAL VAL LEU LEU ASP LYS          
SEQRES  12 B  221  ARG GLU GLY ARG ARG VAL PRO PHE SER ALA ASP TYR VAL          
SEQRES  13 B  221  VAL ALA ASN ILE PRO ASN ALA PHE VAL ILE GLY TYR GLY          
SEQRES  14 B  221  LEU ASP TYR ASP ASP THR TYR ARG GLU LEU ARG ASP ILE          
SEQRES  15 B  221  VAL VAL LEU ARG PRO GLU VAL TYR ALA GLU ARG GLU ALA          
SEQRES  16 B  221  ALA ARG GLY LYS LYS GLN ARG ALA ILE GLY SER ALA ASP          
SEQRES  17 B  221  THR ASP ARG ASP ALA LYS ARG GLU PHE HIS SER LYS TYR          
HET     MG  A 900       1                                                       
HET     MG  A 902       1                                                       
HET    7HP  A 800      10                                                       
HET    PRP  A 801      22                                                       
HET     MG  B 912       1                                                       
HET     MG  B 910       1                                                       
HET    7HP  B 810      10                                                       
HET    PRP  B 811      22                                                       
HET    FMT  B 479       3                                                       
HETNAM      MG MAGNESIUM ION                                                    
HETNAM     7HP 7-HYDROXY-PYRAZOLO[4,3-D]PYRIMIDINE                              
HETNAM     PRP 1-O-PYROPHOSPHONO-5-O-PHOSPHONO-ALPHA-D-RIBOFURANOSE             
HETNAM     FMT FORMIC ACID                                                      
HETSYN     PRP ALPHA-PHOSPHORIBOSYLPYROPHOSPHORIC ACID; 1-O-                    
HETSYN   2 PRP  PYROPHOSPHONO-5-O-PHOSPHONO-ALPHA-D-RIBOSE; 1-O-                
HETSYN   3 PRP  PYROPHOSPHONO-5-O-PHOSPHONO-D-RIBOSE; 1-O-                      
HETSYN   4 PRP  PYROPHOSPHONO-5-O-PHOSPHONO-RIBOSE                              
FORMUL   3   MG    4(MG 2+)                                                     
FORMUL   5  7HP    2(C5 H4 N4 O)                                                
FORMUL   6  PRP    2(C5 H13 O14 P3)                                             
FORMUL  11  FMT    C H2 O2                                                      
FORMUL  12  HOH   *178(H2 O)                                                    
HELIX    1   1 THR A   14  LYS A   34  1                                  21    
HELIX    2   2 SER A   54  PHE A   68  1                                  15    
HELIX    3   3 ALA A  117  ARG A  130  1                                  14    
HELIX    4   4 ARG A  144  ARG A  147  5                                   4    
HELIX    5   5 ARG A  186  ALA A  191  1                                   6    
HELIX    6   6 THR B   14  LYS B   34  1                                  21    
HELIX    7   7 GLY B   35  GLY B   37  5                                   3    
HELIX    8   8 SER B   54  PHE B   68  1                                  15    
HELIX    9   9 ALA B  117  THR B  129  1                                  13    
HELIX   10  10 ARG B  144  ARG B  147  5                                   4    
HELIX   11  11 ARG B  186  ALA B  196  1                                  11    
SHEET    1   A 3 ALA A   8  PHE A  13  0                                        
SHEET    2   A 3 ILE A 182  LEU A 185 -1  O  VAL A 184   N  LYS A  10           
SHEET    3   A 3 VAL A 165  ILE A 166 -1  N  ILE A 166   O  VAL A 183           
SHEET    1   B 6 ARG A  93  LEU A  96  0                                        
SHEET    2   B 6 VAL A  72  SER A  80 -1  N  SER A  80   O  ARG A  93           
SHEET    3   B 6 LEU A  45  VAL A  50  1  N  LEU A  47   O  ARG A  73           
SHEET    4   B 6 HIS A 106  VAL A 114  1  O  VAL A 110   N  ILE A  48           
SHEET    5   B 6 SER A 134  ASP A 142  1  O  VAL A 138   N  ILE A 109           
SHEET    6   B 6 TYR A 155  ASN A 159  1  O  TYR A 155   N  VAL A 139           
SHEET    1   C 3 ALA B   8  PHE B  13  0                                        
SHEET    2   C 3 ILE B 182  LEU B 185 -1  O  VAL B 184   N  LYS B  10           
SHEET    3   C 3 VAL B 165  ILE B 166 -1  N  ILE B 166   O  VAL B 183           
SHEET    1   D 6 ARG B  93  LEU B  96  0                                        
SHEET    2   D 6 VAL B  72  SER B  80 -1  N  SER B  80   O  ARG B  93           
SHEET    3   D 6 LEU B  45  LEU B  51  1  N  SER B  49   O  GLU B  75           
SHEET    4   D 6 HIS B 106  VAL B 114  1  O  HIS B 106   N  VAL B  46           
SHEET    5   D 6 SER B 134  ASP B 142  1  O  LYS B 136   N  ILE B 109           
SHEET    6   D 6 TYR B 155  ASN B 159  1  O  TYR B 155   N  VAL B 139           
LINK         OD1 ASP A 171                MG    MG A 902     1555   1555  2.10  
LINK         O3  PRP A 801                MG    MG A 900     1555   1555  2.28  
LINK         O1  PRP A 801                MG    MG A 900     1555   1555  2.59  
LINK         O2  PRP A 801                MG    MG A 900     1555   1555  2.28  
LINK         O3B PRP A 801                MG    MG A 900     1555   1555  2.27  
LINK         O1B PRP A 801                MG    MG A 902     1555   1555  2.06  
LINK         O2A PRP A 801                MG    MG A 902     1555   1555  2.12  
LINK        MG    MG A 900                 O   HOH A5502     1555   1555  2.08  
LINK        MG    MG A 900                 O   HOH A5503     1555   1555  2.16  
LINK        MG    MG A 902                 O   HOH A5504     1555   1555  2.05  
LINK        MG    MG A 902                 O   HOH A5505     1555   1555  2.10  
LINK        MG    MG A 902                 O   HOH A5506     1555   1555  2.04  
LINK         OD1 ASP B 171                MG    MG B 912     1555   1555  2.20  
LINK         O3  PRP B 811                MG    MG B 910     1555   1555  2.13  
LINK         O2  PRP B 811                MG    MG B 910     1555   1555  2.13  
LINK         O3B PRP B 811                MG    MG B 910     1555   1555  2.11  
LINK         O1  PRP B 811                MG    MG B 910     1555   1555  2.36  
LINK         O2A PRP B 811                MG    MG B 912     1555   1555  2.04  
LINK         O1B PRP B 811                MG    MG B 912     1555   1555  2.23  
LINK        MG    MG B 910                 O   HOH B5510     1555   1555  2.09  
LINK        MG    MG B 910                 O   HOH B5511     1555   1555  2.06  
LINK        MG    MG B 912                 O   HOH B5507     1555   1555  2.12  
LINK        MG    MG B 912                 O   HOH B5508     1555   1555  2.04  
LINK        MG    MG B 912                 O   HOH B5509     1555   1555  2.06  
CISPEP   1 LEU A   51    LYS A   52          0         0.02                     
CISPEP   2 LEU B   51    LYS B   52          0         2.44                     
CRYST1   39.450  102.250   52.000  90.00  94.11  90.00 P 1 21 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      0.025349 -0.000001  0.001821        0.00000                         
SCALE2      0.000000  0.009780  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.019280        0.00000