PDB Short entry for 2IAG
HEADER    ISOMERASE                               08-SEP-06   2IAG              
TITLE     CRYSTAL STRUCTURE OF HUMAN PROSTACYCLIN SYNTHASE                      
COMPND    MOL_ID: 1;                                                            
COMPND   2 MOLECULE: PROSTACYCLIN SYNTHASE;                                     
COMPND   3 CHAIN: A, B;                                                         
COMPND   4 FRAGMENT: RESIDUES 23-500;                                           
COMPND   5 SYNONYM: PROSTAGLANDIN I2 SYNTHASE;                                  
COMPND   6 EC: 5.3.99.4;                                                        
COMPND   7 ENGINEERED: YES                                                      
SOURCE    MOL_ID: 1;                                                            
SOURCE   2 ORGANISM_SCIENTIFIC: HOMO SAPIENS;                                   
SOURCE   3 ORGANISM_COMMON: HUMAN;                                              
SOURCE   4 ORGANISM_TAXID: 9606;                                                
SOURCE   5 GENE: PTGIS;                                                         
SOURCE   6 EXPRESSION_SYSTEM: ESCHERICHIA COLI;                                 
SOURCE   7 EXPRESSION_SYSTEM_TAXID: 562;                                        
SOURCE   8 EXPRESSION_SYSTEM_STRAIN: BL21(DE3), B834(DE3);                      
SOURCE   9 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID;                              
SOURCE  10 EXPRESSION_SYSTEM_PLASMID: PCW;                                      
SOURCE  11 OTHER_DETAILS: PLASMID PCW WAS A GIFT FROM DR. AMY ROTH,             
SOURCE  12 UNIVERSITY OF OREGON.                                                
KEYWDS    PROSTACYCLIN SYNTHASE, CLASS III CYTOCHORME P450,                     
KEYWDS   2 HEMOPROTEIN, CYP8A1, ISOMERASE                                       
EXPDTA    X-RAY DIFFRACTION                                                     
AUTHOR    C.-W.CHIANG,H.-C.YEH,L.-H.WANG,N.-L.CHAN                              
REVDAT   3   24-FEB-09 2IAG    1       VERSN                                    
REVDAT   2   28-NOV-06 2IAG    1       JRNL                                     
REVDAT   1   10-OCT-06 2IAG    0                                                
JRNL        AUTH   C.-W.CHIANG,H.-C.YEH,L.-H.WANG,N.-L.CHAN                     
JRNL        TITL   CRYSTAL STRUCTURE OF THE HUMAN PROSTACYCLIN                  
JRNL        TITL 2 SYNTHASE                                                     
JRNL        REF    J.MOL.BIOL.                   V. 364   266 2006              
JRNL        REFN                   ISSN 0022-2836                               
JRNL        PMID   17020766                                                     
JRNL        DOI    10.1016/J.JMB.2006.09.039                                    
REMARK   1                                                                      
REMARK   2                                                                      
REMARK   2 RESOLUTION.    2.15 ANGSTROMS.                                       
REMARK   3                                                                      
REMARK   3 REFINEMENT.                                                          
REMARK   3   PROGRAM     : REFMAC 5.2.0019                                      
REMARK   3   AUTHORS     : MURSHUDOV,VAGIN,DODSON                               
REMARK   3                                                                      
REMARK   3    REFINEMENT TARGET : MAXIMUM LIKELIHOOD                            
REMARK   3                                                                      
REMARK   3  DATA USED IN REFINEMENT.                                            
REMARK   3   RESOLUTION RANGE HIGH (ANGSTROMS) : 2.15                           
REMARK   3   RESOLUTION RANGE LOW  (ANGSTROMS) : 20.15                          
REMARK   3   DATA CUTOFF            (SIGMA(F)) : NULL                           
REMARK   3   COMPLETENESS FOR RANGE        (%) : 91.0                           
REMARK   3   NUMBER OF REFLECTIONS             : 48702                          
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) : 0.204                           
REMARK   3   R VALUE            (WORKING SET) : 0.201                           
REMARK   3   FREE R VALUE                     : 0.263                           
REMARK   3   FREE R VALUE TEST SET SIZE   (%) : 5.100                           
REMARK   3   FREE R VALUE TEST SET COUNT      : 2601                            
REMARK   3                                                                      
REMARK   3  FIT IN THE HIGHEST RESOLUTION BIN.                                  
REMARK   3   TOTAL NUMBER OF BINS USED           : 20                           
REMARK   3   BIN RESOLUTION RANGE HIGH       (A) : 2.15                         
REMARK   3   BIN RESOLUTION RANGE LOW        (A) : 2.21                         
REMARK   3   REFLECTION IN BIN     (WORKING SET) : 3616                         
REMARK   3   BIN COMPLETENESS (WORKING+TEST) (%) : 93.29                        
REMARK   3   BIN R VALUE           (WORKING SET) : 0.2150                       
REMARK   3   BIN FREE R VALUE SET COUNT          : 195                          
REMARK   3   BIN FREE R VALUE                    : 0.3180                       
REMARK   3                                                                      
REMARK   3  NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT.                    
REMARK   3   PROTEIN ATOMS            : 7611                                    
REMARK   3   NUCLEIC ACID ATOMS       : 0                                       
REMARK   3   HETEROGEN ATOMS          : 87                                      
REMARK   3   SOLVENT ATOMS            : 435                                     
REMARK   3                                                                      
REMARK   3  B VALUES.                                                           
REMARK   3   FROM WILSON PLOT           (A**2) : NULL                           
REMARK   3   MEAN B VALUE      (OVERALL, A**2) : 26.95                          
REMARK   3   OVERALL ANISOTROPIC B VALUE.                                       
REMARK   3    B11 (A**2) : 0.00000                                              
REMARK   3    B22 (A**2) : 0.00000                                              
REMARK   3    B33 (A**2) : 0.00000                                              
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): 0.322         
REMARK   3   ESU BASED ON FREE R VALUE                       (A): 0.243         
REMARK   3   ESU BASED ON MAXIMUM LIKELIHOOD                 (A): 0.155         
REMARK   3   ESU FOR B VALUES BASED ON MAXIMUM LIKELIHOOD (A**2): 5.798         
REMARK   3                                                                      
REMARK   3 CORRELATION COEFFICIENTS.                                            
REMARK   3   CORRELATION COEFFICIENT FO-FC      : 0.938                         
REMARK   3   CORRELATION COEFFICIENT FO-FC FREE : 0.906                         
REMARK   3                                                                      
REMARK   3  RMS DEVIATIONS FROM IDEAL VALUES        COUNT    RMS    WEIGHT      
REMARK   3   BOND LENGTHS REFINED ATOMS        (A):  7915 ; 0.011 ; 0.022       
REMARK   3   BOND LENGTHS OTHERS               (A):  NULL ;  NULL ;  NULL       
REMARK   3   BOND ANGLES REFINED ATOMS   (DEGREES): 10757 ; 1.380 ; 2.001       
REMARK   3   BOND ANGLES OTHERS          (DEGREES):  NULL ;  NULL ;  NULL       
REMARK   3   TORSION ANGLES, PERIOD 1    (DEGREES):   935 ; 6.177 ; 5.000       
REMARK   3   TORSION ANGLES, PERIOD 2    (DEGREES):   374 ;32.256 ;22.433       
REMARK   3   TORSION ANGLES, PERIOD 3    (DEGREES):  1325 ;17.588 ;15.000       
REMARK   3   TORSION ANGLES, PERIOD 4    (DEGREES):    74 ;18.433 ;15.000       
REMARK   3   CHIRAL-CENTER RESTRAINTS       (A**3):  1144 ; 0.095 ; 0.200       
REMARK   3   GENERAL PLANES REFINED ATOMS      (A):  6066 ; 0.005 ; 0.020       
REMARK   3   GENERAL PLANES OTHERS             (A):  NULL ;  NULL ;  NULL       
REMARK   3   NON-BONDED CONTACTS REFINED ATOMS (A):  3657 ; 0.205 ; 0.200       
REMARK   3   NON-BONDED CONTACTS OTHERS        (A):  NULL ;  NULL ;  NULL       
REMARK   3   NON-BONDED TORSION REFINED ATOMS  (A):  5280 ; 0.304 ; 0.200       
REMARK   3   NON-BONDED TORSION OTHERS         (A):  NULL ;  NULL ;  NULL       
REMARK   3   H-BOND (X...Y) REFINED ATOMS      (A):   480 ; 0.160 ; 0.200       
REMARK   3   H-BOND (X...Y) OTHERS             (A):  NULL ;  NULL ;  NULL       
REMARK   3   POTENTIAL METAL-ION REFINED ATOMS (A):  NULL ;  NULL ;  NULL       
REMARK   3   POTENTIAL METAL-ION OTHERS        (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY VDW REFINED ATOMS        (A):    84 ; 0.192 ; 0.200       
REMARK   3   SYMMETRY VDW OTHERS               (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY H-BOND REFINED ATOMS     (A):    25 ; 0.154 ; 0.200       
REMARK   3   SYMMETRY H-BOND OTHERS            (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY METAL-ION REFINED ATOMS  (A):  NULL ;  NULL ;  NULL       
REMARK   3   SYMMETRY METAL-ION OTHERS         (A):  NULL ;  NULL ;  NULL       
REMARK   3                                                                      
REMARK   3  ISOTROPIC THERMAL FACTOR RESTRAINTS.     COUNT   RMS    WEIGHT      
REMARK   3   MAIN-CHAIN BOND REFINED ATOMS  (A**2):  4689 ; 0.642 ; 1.500       
REMARK   3   MAIN-CHAIN BOND OTHER ATOMS    (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   MAIN-CHAIN ANGLE REFINED ATOMS (A**2):  7541 ; 1.213 ; 2.000       
REMARK   3   SIDE-CHAIN BOND REFINED ATOMS  (A**2):  3373 ; 1.961 ; 3.000       
REMARK   3   SIDE-CHAIN ANGLE REFINED ATOMS (A**2):  3216 ; 2.987 ; 4.500       
REMARK   3                                                                      
REMARK   3 ANISOTROPIC THERMAL FACTOR RESTRAINTS.    COUNT   RMS   WEIGHT       
REMARK   3   RIGID-BOND RESTRAINTS          (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SPHERICITY; FREE ATOMS         (A**2):  NULL ;  NULL ;  NULL       
REMARK   3   SPHERICITY; BONDED ATOMS       (A**2):  NULL ;  NULL ;  NULL       
REMARK   3                                                                      
REMARK   3  NCS RESTRAINTS STATISTICS                                           
REMARK   3   NUMBER OF DIFFERENT NCS GROUPS : NULL                              
REMARK   3                                                                      
REMARK   3  TLS DETAILS                                                         
REMARK   3   NUMBER OF TLS GROUPS  : NULL                                       
REMARK   3                                                                      
REMARK   3  BULK SOLVENT MODELLING.                                             
REMARK   3   METHOD USED : MASK                                                 
REMARK   3   PARAMETERS FOR MASK CALCULATION                                    
REMARK   3   VDW PROBE RADIUS   : 1.40                                          
REMARK   3   ION PROBE RADIUS   : 0.80                                          
REMARK   3   SHRINKAGE RADIUS   : 0.80                                          
REMARK   3                                                                      
REMARK   3  OTHER REFINEMENT REMARKS: HYDROGENS HAVE BEEN ADDED IN THE          
REMARK   3  RIDING POSITIONS                                                    
REMARK   4                                                                      
REMARK   4 2IAG COMPLIES WITH FORMAT V. 3.15, 01-DEC-08                         
REMARK 100                                                                      
REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY PDBJ ON 12-SEP-06.                  
REMARK 100 THE RCSB ID CODE IS RCSB039339.                                      
REMARK 200                                                                      
REMARK 200 EXPERIMENTAL DETAILS                                                 
REMARK 200  EXPERIMENT TYPE                : X-RAY DIFFRACTION                  
REMARK 200  DATE OF DATA COLLECTION        : 29-JUN-06; 15-MAY-06               
REMARK 200  TEMPERATURE           (KELVIN) : 100; 100                           
REMARK 200  PH                             : 8.0                                
REMARK 200  NUMBER OF CRYSTALS USED        : 2                                  
REMARK 200                                                                      
REMARK 200  SYNCHROTRON              (Y/N) : Y; Y                               
REMARK 200  RADIATION SOURCE               : NSRRC; SPRING-8                    
REMARK 200  BEAMLINE                       : BL13B1; BL12B2                     
REMARK 200  X-RAY GENERATOR MODEL          : NULL; NULL                         
REMARK 200  MONOCHROMATIC OR LAUE    (M/L) : M; M                               
REMARK 200  WAVELENGTH OR RANGE        (A) : 0.980127; 0.9537, 0.9793           
REMARK 200  MONOCHROMATOR                  : NULL; NULL                         
REMARK 200  OPTICS                         : NULL; NULL                         
REMARK 200                                                                      
REMARK 200  DETECTOR TYPE                  : CCD; CCD                           
REMARK 200  DETECTOR MANUFACTURER          : ADSC QUANTUM 315; ADSC             
REMARK 200                                   QUANTUM 4                          
REMARK 200  INTENSITY-INTEGRATION SOFTWARE : HKL-2000                           
REMARK 200  DATA SCALING SOFTWARE          : HKL-2000                           
REMARK 200                                                                      
REMARK 200  NUMBER OF UNIQUE REFLECTIONS   : 51322                              
REMARK 200  RESOLUTION RANGE HIGH      (A) : 2.150                              
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     (%) : 90.9                               
REMARK 200  DATA REDUNDANCY                : 2.800                              
REMARK 200  R MERGE                    (I) : NULL                               
REMARK 200  R SYM                      (I) : 0.06300                            
REMARK 200  <I/SIGMA(I)> FOR THE DATA SET  : 12.7000                            
REMARK 200                                                                      
REMARK 200 IN THE HIGHEST RESOLUTION SHELL.                                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 2.15                     
REMARK 200  HIGHEST RESOLUTION SHELL, RANGE LOW  (A) : 2.23                     
REMARK 200  COMPLETENESS FOR SHELL     (%) : 93.5                               
REMARK 200  DATA REDUNDANCY IN SHELL       : NULL                               
REMARK 200  R MERGE FOR SHELL          (I) : NULL                               
REMARK 200  R SYM FOR SHELL            (I) : 0.35000                            
REMARK 200  <I/SIGMA(I)> FOR SHELL         : 3.100                              
REMARK 200                                                                      
REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH; MAD                         
REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MAD                          
REMARK 200 SOFTWARE USED: SOLVE                                                 
REMARK 200 STARTING MODEL: NULL                                                 
REMARK 200                                                                      
REMARK 200 REMARK: NULL                                                         
REMARK 280                                                                      
REMARK 280 CRYSTAL                                                              
REMARK 280 SOLVENT CONTENT, VS   (%): 48.45                                     
REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.39                     
REMARK 280                                                                      
REMARK 280 CRYSTALLIZATION CONDITIONS: THE NATIVE RECOMBINANT PGIS (25 MG/      
REMARK 280  ML IN THE BUFFER CONTAINING 20 MM TRIS, PH 8.0 AND 150 MM           
REMARK 280  NACL) WAS FOUND TO CRYSTALLIZE SPONTANEOUSLY INTO NEEDLE            
REMARK 280  CLUSTERS IN THE EPPENDORF TUBE WHEN STORED AT 4 C FOR ABOUT A       
REMARK 280  WEEK. A COMBINATION OF MICROSEEDING TECHNIQUE AND THE HANGING-      
REMARK 280  DROP VAPOR-DIFFUSION METHOD WAS THEN USED TO IMPROVE CRYSTAL        
REMARK 280  QUALITY. SPECIFICALLY, SEED STOCK WAS PREPARED BY CRUSHING          
REMARK 280  THESE INITIAL PGIS NEEDLE CLUSTERS WITH THE SEED BEAD KIT           
REMARK 280  (HAMPTON RESEARCH). FOLLOWING FOUR 10-FOLD SERIAL DILUTIONS OF      
REMARK 280  THE SEED STOCK USING THE GEL FILTRATION BUFFER, 1 MICRO-L OF        
REMARK 280  DILUTED SEEDS WAS ADDED INTO A 10 MICRO-L DROP OF FRESHLY           
REMARK 280  CONCENTRATED PGIS SAMPLE, AND EQUILIBRATED AT 4 C AGAINST 450       
REMARK 280  MICRO-L OF THE GEL FILTRATION BUFFER. HIGH QUALITY SINGLE           
REMARK 280  CRYSTALS OF PGIS WERE MOST OFTEN OBTAINED USING 100- OR 1000-       
REMARK 280  FOLD DILUTED SEED STOCK, AND REACHED SUITABLE SIZE (~ 0.05,         
REMARK 280  0.05 ~ 0.1 MM3) WITHIN ONE WEEK., VAPOR DIFFUSION, HANGING          
REMARK 280  DROP, TEMPERATURE 277K                                              
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       52.79800            
REMARK 290   SMTRY3   2  0.000000  0.000000 -1.000000        0.00000            
REMARK 290                                                                      
REMARK 290 REMARK: NULL                                                         
REMARK 300                                                                      
REMARK 300 BIOMOLECULE: 1, 2                                                    
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: THERE ARE TWO PROSTACYCLIN SYNTHASE MOLECULES IN THE         
REMARK 300 ASYMMETRIC UNIT, BUT THE ENZYME SHOULD FUNCTION AS A MONOMER.        
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 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                                                                      
REMARK 350 BIOMOLECULE: 2                                                       
REMARK 350 AUTHOR DETERMINED BIOLOGICAL UNIT: MONOMERIC                         
REMARK 350 APPLY THE FOLLOWING TO CHAINS: 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     ALA A   320                                                      
REMARK 465     GLU A   321                                                      
REMARK 465     GLN A   322                                                      
REMARK 465     PRO A   323                                                      
REMARK 465     VAL A   324                                                      
REMARK 465     SER A   325                                                      
REMARK 465     GLN A   326                                                      
REMARK 465     THR A   327                                                      
REMARK 465     HIS A   502                                                      
REMARK 465     HIS A   503                                                      
REMARK 465     HIS A   504                                                      
REMARK 465     GLN B   319                                                      
REMARK 465     ALA B   320                                                      
REMARK 465     GLU B   321                                                      
REMARK 465     GLN B   322                                                      
REMARK 465     PRO B   323                                                      
REMARK 465     VAL B   324                                                      
REMARK 465     SER B   325                                                      
REMARK 465     GLN B   326                                                      
REMARK 465     THR B   327                                                      
REMARK 465     THR B   328                                                      
REMARK 465     THR B   329                                                      
REMARK 465     LEU B   330                                                      
REMARK 465     HIS B   503                                                      
REMARK 465     HIS B   504                                                      
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    TRP A  39      -50.45     66.67                                   
REMARK 500    ASP A  49       84.49   -156.20                                   
REMARK 500    HIS A 130     -124.13     57.28                                   
REMARK 500    ARG A 188       97.35     71.05                                   
REMARK 500    ASN A 439       62.66   -109.61                                   
REMARK 500    PRO B  38      133.65    -39.70                                   
REMARK 500    TRP B  39      -52.19     67.41                                   
REMARK 500    ASP B  49       85.08   -164.58                                   
REMARK 500    HIS B 130     -126.26     56.37                                   
REMARK 500    PRO B 187      -75.41    -41.05                                   
REMARK 500    ARG B 188       94.38     85.85                                   
REMARK 500    GLN B 332      -38.07    -33.05                                   
REMARK 500    SER B 337       46.15   -142.44                                   
REMARK 500    ASP B 477       99.55    -69.14                                   
REMARK 500    HIS B 501       82.71    -43.43                                   
REMARK 500                                                                      
REMARK 500 REMARK: NULL                                                         
REMARK 500                                                                      
REMARK 500 GEOMETRY AND STEREOCHEMISTRY                                         
REMARK 500 SUBTOPIC: NON-CIS, NON-TRANS                                         
REMARK 500                                                                      
REMARK 500 THE FOLLOWING PEPTIDE BONDS DEVIATE SIGNIFICANTLY FROM BOTH          
REMARK 500 CIS AND TRANS CONFORMATION.  CIS BONDS, IF ANY, ARE LISTED           
REMARK 500 ON CISPEP RECORDS.  TRANS IS DEFINED AS 180 +/- 30 AND               
REMARK 500 CIS IS DEFINED AS 0 +/- 30 DEGREES.                                  
REMARK 500                                 MODEL     OMEGA                      
REMARK 500 LEU A  186     PRO A  187                  130.64                    
REMARK 500 LEU B  186     PRO B  187                  132.65                    
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 HEM A 600                 
REMARK 800 SITE_IDENTIFIER: AC2                                                 
REMARK 800 EVIDENCE_CODE: SOFTWARE                                              
REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE HEM B 600                 
DBREF  2IAG A   23   500  UNP    Q16647   PTGIS_HUMAN     23    500             
DBREF  2IAG B   23   500  UNP    Q16647   PTGIS_HUMAN     23    500             
SEQADV 2IAG HIS A  501  UNP  Q16647              EXPRESSION TAG                 
SEQADV 2IAG HIS A  502  UNP  Q16647              EXPRESSION TAG                 
SEQADV 2IAG HIS A  503  UNP  Q16647              EXPRESSION TAG                 
SEQADV 2IAG HIS A  504  UNP  Q16647              EXPRESSION TAG                 
SEQADV 2IAG HIS B  501  UNP  Q16647              EXPRESSION TAG                 
SEQADV 2IAG HIS B  502  UNP  Q16647              EXPRESSION TAG                 
SEQADV 2IAG HIS B  503  UNP  Q16647              EXPRESSION TAG                 
SEQADV 2IAG HIS B  504  UNP  Q16647              EXPRESSION TAG                 
SEQRES   1 A  482  ARG THR ARG ARG PRO GLY GLU PRO PRO LEU ASP LEU GLY          
SEQRES   2 A  482  SER ILE PRO TRP LEU GLY TYR ALA LEU ASP PHE GLY LYS          
SEQRES   3 A  482  ASP ALA ALA SER PHE LEU THR ARG MET LYS GLU LYS HIS          
SEQRES   4 A  482  GLY ASP ILE PHE THR ILE LEU VAL GLY GLY ARG TYR VAL          
SEQRES   5 A  482  THR VAL LEU LEU ASP PRO HIS SER TYR ASP ALA VAL VAL          
SEQRES   6 A  482  TRP GLU PRO ARG THR ARG LEU ASP PHE HIS ALA TYR ALA          
SEQRES   7 A  482  ILE PHE LEU MET GLU ARG ILE PHE ASP VAL GLN LEU PRO          
SEQRES   8 A  482  HIS TYR SER PRO SER ASP GLU LYS ALA ARG MET LYS LEU          
SEQRES   9 A  482  THR LEU LEU HIS ARG GLU LEU GLN ALA LEU THR GLU ALA          
SEQRES  10 A  482  MET TYR THR ASN LEU HIS ALA VAL LEU LEU GLY ASP ALA          
SEQRES  11 A  482  THR GLU ALA GLY SER GLY TRP HIS GLU MET GLY LEU LEU          
SEQRES  12 A  482  ASP PHE SER TYR SER PHE LEU LEU ARG ALA GLY TYR LEU          
SEQRES  13 A  482  THR LEU TYR GLY ILE GLU ALA LEU PRO ARG THR HIS GLU          
SEQRES  14 A  482  SER GLN ALA GLN ASP ARG VAL HIS SER ALA ASP VAL PHE          
SEQRES  15 A  482  HIS THR PHE ARG GLN LEU ASP ARG LEU LEU PRO LYS LEU          
SEQRES  16 A  482  ALA ARG GLY SER LEU SER VAL GLY ASP LYS ASP HIS MET          
SEQRES  17 A  482  CYS SER VAL LYS SER ARG LEU TRP LYS LEU LEU SER PRO          
SEQRES  18 A  482  ALA ARG LEU ALA ARG ARG ALA HIS ARG SER LYS TRP LEU          
SEQRES  19 A  482  GLU SER TYR LEU LEU HIS LEU GLU GLU MET GLY VAL SER          
SEQRES  20 A  482  GLU GLU MET GLN ALA ARG ALA LEU VAL LEU GLN LEU TRP          
SEQRES  21 A  482  ALA THR GLN GLY ASN MET GLY PRO ALA ALA PHE TRP LEU          
SEQRES  22 A  482  LEU LEU PHE LEU LEU LYS ASN PRO GLU ALA LEU ALA ALA          
SEQRES  23 A  482  VAL ARG GLY GLU LEU GLU SER ILE LEU TRP GLN ALA GLU          
SEQRES  24 A  482  GLN PRO VAL SER GLN THR THR THR LEU PRO GLN LYS VAL          
SEQRES  25 A  482  LEU ASP SER THR PRO VAL LEU ASP SER VAL LEU SER GLU          
SEQRES  26 A  482  SER LEU ARG LEU THR ALA ALA PRO PHE ILE THR ARG GLU          
SEQRES  27 A  482  VAL VAL VAL ASP LEU ALA MET PRO MET ALA ASP GLY ARG          
SEQRES  28 A  482  GLU PHE ASN LEU ARG ARG GLY ASP ARG LEU LEU LEU PHE          
SEQRES  29 A  482  PRO PHE LEU SER PRO GLN ARG ASP PRO GLU ILE TYR THR          
SEQRES  30 A  482  ASP PRO GLU VAL PHE LYS TYR ASN ARG PHE LEU ASN PRO          
SEQRES  31 A  482  ASP GLY SER GLU LYS LYS ASP PHE TYR LYS ASP GLY LYS          
SEQRES  32 A  482  ARG LEU LYS ASN TYR ASN MET PRO TRP GLY ALA GLY HIS          
SEQRES  33 A  482  ASN HIS CYS LEU GLY ARG SER TYR ALA VAL ASN SER ILE          
SEQRES  34 A  482  LYS GLN PHE VAL PHE LEU VAL LEU VAL HIS LEU ASP LEU          
SEQRES  35 A  482  GLU LEU ILE ASN ALA ASP VAL GLU ILE PRO GLU PHE ASP          
SEQRES  36 A  482  LEU SER ARG TYR GLY PHE GLY LEU MET GLN PRO GLU HIS          
SEQRES  37 A  482  ASP VAL PRO VAL ARG TYR ARG ILE ARG PRO HIS HIS HIS          
SEQRES  38 A  482  HIS                                                          
SEQRES   1 B  482  ARG THR ARG ARG PRO GLY GLU PRO PRO LEU ASP LEU GLY          
SEQRES   2 B  482  SER ILE PRO TRP LEU GLY TYR ALA LEU ASP PHE GLY LYS          
SEQRES   3 B  482  ASP ALA ALA SER PHE LEU THR ARG MET LYS GLU LYS HIS          
SEQRES   4 B  482  GLY ASP ILE PHE THR ILE LEU VAL GLY GLY ARG TYR VAL          
SEQRES   5 B  482  THR VAL LEU LEU ASP PRO HIS SER TYR ASP ALA VAL VAL          
SEQRES   6 B  482  TRP GLU PRO ARG THR ARG LEU ASP PHE HIS ALA TYR ALA          
SEQRES   7 B  482  ILE PHE LEU MET GLU ARG ILE PHE ASP VAL GLN LEU PRO          
SEQRES   8 B  482  HIS TYR SER PRO SER ASP GLU LYS ALA ARG MET LYS LEU          
SEQRES   9 B  482  THR LEU LEU HIS ARG GLU LEU GLN ALA LEU THR GLU ALA          
SEQRES  10 B  482  MET TYR THR ASN LEU HIS ALA VAL LEU LEU GLY ASP ALA          
SEQRES  11 B  482  THR GLU ALA GLY SER GLY TRP HIS GLU MET GLY LEU LEU          
SEQRES  12 B  482  ASP PHE SER TYR SER PHE LEU LEU ARG ALA GLY TYR LEU          
SEQRES  13 B  482  THR LEU TYR GLY ILE GLU ALA LEU PRO ARG THR HIS GLU          
SEQRES  14 B  482  SER GLN ALA GLN ASP ARG VAL HIS SER ALA ASP VAL PHE          
SEQRES  15 B  482  HIS THR PHE ARG GLN LEU ASP ARG LEU LEU PRO LYS LEU          
SEQRES  16 B  482  ALA ARG GLY SER LEU SER VAL GLY ASP LYS ASP HIS MET          
SEQRES  17 B  482  CYS SER VAL LYS SER ARG LEU TRP LYS LEU LEU SER PRO          
SEQRES  18 B  482  ALA ARG LEU ALA ARG ARG ALA HIS ARG SER LYS TRP LEU          
SEQRES  19 B  482  GLU SER TYR LEU LEU HIS LEU GLU GLU MET GLY VAL SER          
SEQRES  20 B  482  GLU GLU MET GLN ALA ARG ALA LEU VAL LEU GLN LEU TRP          
SEQRES  21 B  482  ALA THR GLN GLY ASN MET GLY PRO ALA ALA PHE TRP LEU          
SEQRES  22 B  482  LEU LEU PHE LEU LEU LYS ASN PRO GLU ALA LEU ALA ALA          
SEQRES  23 B  482  VAL ARG GLY GLU LEU GLU SER ILE LEU TRP GLN ALA GLU          
SEQRES  24 B  482  GLN PRO VAL SER GLN THR THR THR LEU PRO GLN LYS VAL          
SEQRES  25 B  482  LEU ASP SER THR PRO VAL LEU ASP SER VAL LEU SER GLU          
SEQRES  26 B  482  SER LEU ARG LEU THR ALA ALA PRO PHE ILE THR ARG GLU          
SEQRES  27 B  482  VAL VAL VAL ASP LEU ALA MET PRO MET ALA ASP GLY ARG          
SEQRES  28 B  482  GLU PHE ASN LEU ARG ARG GLY ASP ARG LEU LEU LEU PHE          
SEQRES  29 B  482  PRO PHE LEU SER PRO GLN ARG ASP PRO GLU ILE TYR THR          
SEQRES  30 B  482  ASP PRO GLU VAL PHE LYS TYR ASN ARG PHE LEU ASN PRO          
SEQRES  31 B  482  ASP GLY SER GLU LYS LYS ASP PHE TYR LYS ASP GLY LYS          
SEQRES  32 B  482  ARG LEU LYS ASN TYR ASN MET PRO TRP GLY ALA GLY HIS          
SEQRES  33 B  482  ASN HIS CYS LEU GLY ARG SER TYR ALA VAL ASN SER ILE          
SEQRES  34 B  482  LYS GLN PHE VAL PHE LEU VAL LEU VAL HIS LEU ASP LEU          
SEQRES  35 B  482  GLU LEU ILE ASN ALA ASP VAL GLU ILE PRO GLU PHE ASP          
SEQRES  36 B  482  LEU SER ARG TYR GLY PHE GLY LEU MET GLN PRO GLU HIS          
SEQRES  37 B  482  ASP VAL PRO VAL ARG TYR ARG ILE ARG PRO HIS HIS HIS          
SEQRES  38 B  482  HIS                                                          
HET     NA  B 701       1                                                       
HET    HEM  A 600      43                                                       
HET    HEM  B 600      43                                                       
HETNAM      NA SODIUM ION                                                       
HETNAM     HEM PROTOPORPHYRIN IX CONTAINING FE                                  
HETSYN     HEM HEME                                                             
FORMUL   3   NA    NA 1+                                                        
FORMUL   4  HEM    2(C34 H32 FE N4 O4)                                          
FORMUL   6  HOH   *435(H2 O)                                                    
HELIX    1   1 TYR A   42  ASP A   49  1                                   8    
HELIX    2   2 ASP A   49  GLY A   62  1                                  14    
HELIX    3   3 ASP A   79  SER A   82  5                                   4    
HELIX    4   4 TYR A   83  TRP A   88  1                                   6    
HELIX    5   5 PHE A   96  ASP A  109  1                                  14    
HELIX    6   6 SER A  116  THR A  127  1                                  12    
HELIX    7   7 LEU A  129  GLY A  156  1                                  28    
HELIX    8   8 LEU A  164  GLY A  182  1                                  19    
HELIX    9   9 THR A  189  LEU A  213  1                                  25    
HELIX   10  10 LEU A  213  GLY A  220  1                                   8    
HELIX   11  11 SER A  223  LEU A  241  1                                  19    
HELIX   12  12 SER A  242  ALA A  247  1                                   6    
HELIX   13  13 SER A  253  MET A  266  1                                  14    
HELIX   14  14 SER A  269  GLY A  286  1                                  18    
HELIX   15  15 ASN A  287  ASN A  302  1                                  16    
HELIX   16  16 ASN A  302  TRP A  318  1                                  17    
HELIX   17  17 PRO A  331  SER A  337  1                                   7    
HELIX   18  18 THR A  338  ALA A  353  1                                  16    
HELIX   19  19 GLY A  443  HIS A  461  1                                  19    
HELIX   20  20 ASP A  477  TYR A  481  5                                   5    
HELIX   21  21 TYR B   42  ASP B   49  1                                   8    
HELIX   22  22 ASP B   49  GLY B   62  1                                  14    
HELIX   23  23 ASP B   79  HIS B   81  5                                   3    
HELIX   24  24 SER B   82  TRP B   88  1                                   7    
HELIX   25  25 PHE B   96  ASP B  109  1                                  14    
HELIX   26  26 SER B  116  THR B  127  1                                  12    
HELIX   27  27 LEU B  129  GLY B  156  1                                  28    
HELIX   28  28 LEU B  164  GLY B  182  1                                  19    
HELIX   29  29 THR B  189  GLY B  220  1                                  32    
HELIX   30  30 SER B  223  LEU B  241  1                                  19    
HELIX   31  31 SER B  242  ARG B  248  1                                   7    
HELIX   32  32 SER B  253  MET B  266  1                                  14    
HELIX   33  33 SER B  269  GLY B  286  1                                  18    
HELIX   34  34 ASN B  287  LYS B  301  1                                  15    
HELIX   35  35 ASN B  302  TRP B  318  1                                  17    
HELIX   36  36 GLN B  332  SER B  337  1                                   6    
HELIX   37  37 THR B  338  ALA B  353  1                                  16    
HELIX   38  38 ALA B  436  HIS B  440  5                                   5    
HELIX   39  39 GLY B  443  HIS B  461  1                                  19    
HELIX   40  40 ASP B  477  TYR B  481  5                                   5    
SHEET    1   A 6 LEU A  32  ASP A  33  0                                        
SHEET    2   A 6 ILE A  64  VAL A  69  1  O  THR A  66   N  ASP A  33           
SHEET    3   A 6 ARG A  72  LEU A  77 -1  O  VAL A  74   N  ILE A  67           
SHEET    4   A 6 ARG A 382  LEU A 385  1  O  ARG A 382   N  THR A  75           
SHEET    5   A 6 ILE A 357  VAL A 361 -1  N  ARG A 359   O  LEU A 383           
SHEET    6   A 6 LEU A  94  ASP A  95 -1  N  ASP A  95   O  GLU A 360           
SHEET    1   B 3 HIS A 160  GLY A 163  0                                        
SHEET    2   B 3 PRO A 493  ILE A 498 -1  O  VAL A 494   N  MET A 162           
SHEET    3   B 3 LEU A 462  LEU A 466 -1  N  GLU A 465   O  ARG A 495           
SHEET    1   C 2 LEU A 365  PRO A 368  0                                        
SHEET    2   C 2 GLU A 374  LEU A 377 -1  O  PHE A 375   N  MET A 367           
SHEET    1   D 2 TYR A 421  LYS A 422  0                                        
SHEET    2   D 2 LYS A 425  ARG A 426 -1  O  LYS A 425   N  LYS A 422           
SHEET    1   E 2 GLY A 435  ALA A 436  0                                        
SHEET    2   E 2 ASN A 439  HIS A 440 -1  O  ASN A 439   N  ALA A 436           
SHEET    1   F 6 LEU B  32  ASP B  33  0                                        
SHEET    2   F 6 ILE B  64  VAL B  69  1  O  THR B  66   N  ASP B  33           
SHEET    3   F 6 ARG B  72  LEU B  77 -1  O  VAL B  76   N  PHE B  65           
SHEET    4   F 6 ARG B 382  LEU B 385  1  O  ARG B 382   N  THR B  75           
SHEET    5   F 6 ILE B 357  VAL B 361 -1  N  ARG B 359   O  LEU B 383           
SHEET    6   F 6 LEU B  94  ASP B  95 -1  N  ASP B  95   O  GLU B 360           
SHEET    1   G 3 HIS B 160  GLY B 163  0                                        
SHEET    2   G 3 PRO B 493  ILE B 498 -1  O  VAL B 494   N  MET B 162           
SHEET    3   G 3 LEU B 462  LEU B 466 -1  N  ASP B 463   O  ARG B 497           
SHEET    1   H 2 LEU B 365  PRO B 368  0                                        
SHEET    2   H 2 GLU B 374  LEU B 377 -1  O  PHE B 375   N  MET B 367           
SHEET    1   I 2 TYR B 421  LYS B 422  0                                        
SHEET    2   I 2 LYS B 425  ARG B 426 -1  O  LYS B 425   N  LYS B 422           
LINK        FE   HEM A 600                 SG  CYS A 441     1555   1555  2.53  
LINK        FE   HEM B 600                 SG  CYS B 441     1555   1555  2.47  
CISPEP   1 SER A  390    PRO A  391          0        11.39                     
CISPEP   2 SER B  390    PRO B  391          0        10.88                     
SITE     1 AC1 17 MET A 124  GLN A 280  ALA A 283  THR A 284                    
SITE     2 AC1 17 ASN A 287  PRO A 433  TRP A 434  GLY A 435                    
SITE     3 AC1 17 ASN A 439  CYS A 441  LEU A 442  GLY A 443                    
SITE     4 AC1 17 TYR A 446  ALA A 447  LEU A 485  HOH A 807                    
SITE     5 AC1 17 HOH A 812                                                     
SITE     1 AC2 19 LYS B 121  MET B 124  LEU B 128  ALA B 283                    
SITE     2 AC2 19 THR B 284  ASN B 287  MET B 288  PRO B 355                    
SITE     3 AC2 19 PRO B 433  TRP B 434  GLY B 435  ASN B 439                    
SITE     4 AC2 19 CYS B 441  LEU B 442  GLY B 443  ALA B 447                    
SITE     5 AC2 19 LEU B 485  HOH B 919  HOH B 921                               
CRYST1   67.733  105.596   73.950  90.00  92.01  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      0.014764  0.000000  0.000518        0.00000                         
SCALE2      0.000000  0.009470  0.000000        0.00000                         
SCALE3      0.000000  0.000000  0.013531        0.00000