HEADER HYDROLASE 06-MAY-03 1UDT TITLE CRYSTAL STRUCTURE OF HUMAN PHOSPHODIESTERASE 5 COMPLEXED WITH TITLE 2 SILDENAFIL(VIAGRA) COMPND MOL_ID: 1; COMPND 2 MOLECULE: CGMP-SPECIFIC 3',5'-CYCLIC PHOSPHODIESTERASE; COMPND 3 CHAIN: A; COMPND 4 FRAGMENT: CATALYTIC DOMAIN; COMPND 5 SYNONYM: PHOSPHODIESTERASE 5; COMPND 6 EC: 3.1.4.17; 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 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 6 EXPRESSION_SYSTEM_TAXID: 562 KEYWDS CGMP-SPECIFIC PHOSPHODIESTERASE 5, SILDENAFIL, SELECTIVE INHIBITOR, KEYWDS 2 HYDROLASE EXPDTA X-RAY DIFFRACTION AUTHOR B.-J.SUNG,J.I.LEE,Y.-S.HEO,J.H.KIM,J.MOON,J.M.YOON,Y.-L.HYUN,E.KIM, AUTHOR 2 S.J.EUM,T.G.LEE,J.M.CHO,S.-Y.PARK,J.-O.LEE,Y.H.JEON,K.Y.HWANG,S.RO REVDAT 3 27-DEC-23 1UDT 1 REMARK HETSYN LINK REVDAT 2 24-FEB-09 1UDT 1 VERSN REVDAT 1 11-MAY-04 1UDT 0 JRNL AUTH B.-J.SUNG,K.Y.HWANG,Y.H.JEON,J.I.LEE,Y.-S.HEO,J.H.KIM, JRNL AUTH 2 J.MOON,J.M.YOON,Y.-L.HYUN,E.KIM,S.J.EUM,S.-Y.PARK,J.-O.LEE, JRNL AUTH 3 T.G.LEE,S.RO,J.M.CHO JRNL TITL STRUCTURE OF THE CATALYTIC DOMAIN OF HUMAN PHOSPHODIESTERASE JRNL TITL 2 5 WITH BOUND DRUG MOLECULES JRNL REF NATURE V. 425 98 2003 JRNL REFN ISSN 0028-0836 JRNL PMID 12955149 JRNL DOI 10.1038/NATURE01914 REMARK 2 REMARK 2 RESOLUTION. 2.30 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : CNS 1.1 REMARK 3 AUTHORS : BRUNGER,ADAMS,CLORE,DELANO,GROS,GROSSE- REMARK 3 : KUNSTLEVE,JIANG,KUSZEWSKI,NILGES,PANNU, REMARK 3 : READ,RICE,SIMONSON,WARREN REMARK 3 REMARK 3 REFINEMENT TARGET : ENGH & HUBER REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 2.30 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 19.88 REMARK 3 DATA CUTOFF (SIGMA(F)) : 0.000 REMARK 3 DATA CUTOFF HIGH (ABS(F)) : 317636.600 REMARK 3 DATA CUTOFF LOW (ABS(F)) : 0.0000 REMARK 3 COMPLETENESS (WORKING+TEST) (%) : 87.9 REMARK 3 NUMBER OF REFLECTIONS : 16818 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) : 0.193 REMARK 3 FREE R VALUE : 0.251 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 4.900 REMARK 3 FREE R VALUE TEST SET COUNT : 823 REMARK 3 ESTIMATED ERROR OF FREE R VALUE : 0.009 REMARK 3 REMARK 3 FIT IN THE HIGHEST RESOLUTION BIN. REMARK 3 TOTAL NUMBER OF BINS USED : 6 REMARK 3 BIN RESOLUTION RANGE HIGH (A) : 2.30 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 2.44 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 61.60 REMARK 3 REFLECTIONS IN BIN (WORKING SET) : 1835 REMARK 3 BIN R VALUE (WORKING SET) : 0.2620 REMARK 3 BIN FREE R VALUE : 0.2870 REMARK 3 BIN FREE R VALUE TEST SET SIZE (%) : 5.10 REMARK 3 BIN FREE R VALUE TEST SET COUNT : 99 REMARK 3 ESTIMATED ERROR OF BIN FREE R VALUE : 0.029 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 2542 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 35 REMARK 3 SOLVENT ATOMS : 78 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : 27.10 REMARK 3 MEAN B VALUE (OVERALL, A**2) : 39.70 REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : -3.25000 REMARK 3 B22 (A**2) : -5.52000 REMARK 3 B33 (A**2) : 8.77000 REMARK 3 B12 (A**2) : 0.00000 REMARK 3 B13 (A**2) : 0.00000 REMARK 3 B23 (A**2) : 0.00000 REMARK 3 REMARK 3 ESTIMATED COORDINATE ERROR. REMARK 3 ESD FROM LUZZATI PLOT (A) : 0.27 REMARK 3 ESD FROM SIGMAA (A) : 0.33 REMARK 3 LOW RESOLUTION CUTOFF (A) : 5.00 REMARK 3 REMARK 3 CROSS-VALIDATED ESTIMATED COORDINATE ERROR. REMARK 3 ESD FROM C-V LUZZATI PLOT (A) : 0.35 REMARK 3 ESD FROM C-V SIGMAA (A) : 0.28 REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 BOND LENGTHS (A) : 0.007 REMARK 3 BOND ANGLES (DEGREES) : 1.200 REMARK 3 DIHEDRAL ANGLES (DEGREES) : 19.00 REMARK 3 IMPROPER ANGLES (DEGREES) : 0.710 REMARK 3 REMARK 3 ISOTROPIC THERMAL MODEL : RESTRAINED REMARK 3 REMARK 3 ISOTROPIC THERMAL FACTOR RESTRAINTS. RMS SIGMA REMARK 3 MAIN-CHAIN BOND (A**2) : 3.530 ; 1.500 REMARK 3 MAIN-CHAIN ANGLE (A**2) : 4.980 ; 2.000 REMARK 3 SIDE-CHAIN BOND (A**2) : 5.820 ; 2.000 REMARK 3 SIDE-CHAIN ANGLE (A**2) : 7.510 ; 2.500 REMARK 3 REMARK 3 BULK SOLVENT MODELING. REMARK 3 METHOD USED : FLAT MODEL REMARK 3 KSOL : 0.37 REMARK 3 BSOL : 38.01 REMARK 3 REMARK 3 NCS MODEL : NULL REMARK 3 REMARK 3 NCS RESTRAINTS. RMS SIGMA/WEIGHT REMARK 3 GROUP 1 POSITIONAL (A) : NULL ; NULL REMARK 3 GROUP 1 B-FACTOR (A**2) : NULL ; NULL REMARK 3 REMARK 3 PARAMETER FILE 1 : PROTEIN_REP.PARAM REMARK 3 PARAMETER FILE 2 : ION.PARAM REMARK 3 PARAMETER FILE 3 : WATER_REP.PARAM REMARK 3 PARAMETER FILE 4 : VIA.PARAM REMARK 3 PARAMETER FILE 5 : NULL REMARK 3 TOPOLOGY FILE 1 : PROTEIN.TOP REMARK 3 TOPOLOGY FILE 2 : ION.TOP REMARK 3 TOPOLOGY FILE 3 : WATER.TOP REMARK 3 TOPOLOGY FILE 4 : VIA.TOP REMARK 3 TOPOLOGY FILE 5 : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NULL REMARK 4 REMARK 4 1UDT COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY PDBJ ON 08-MAY-03. REMARK 100 THE DEPOSITION ID IS D_1000005709. REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : 17-APR-03 REMARK 200 TEMPERATURE (KELVIN) : 100 REMARK 200 PH : 7.5 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y REMARK 200 RADIATION SOURCE : PAL/PLS REMARK 200 BEAMLINE : 6B REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 1.0000 REMARK 200 MONOCHROMATOR : NULL REMARK 200 OPTICS : NULL REMARK 200 REMARK 200 DETECTOR TYPE : CCD REMARK 200 DETECTOR MANUFACTURER : ADSC QUANTUM 4 REMARK 200 INTENSITY-INTEGRATION SOFTWARE : HKL-2000 REMARK 200 DATA SCALING SOFTWARE : SCALEPACK REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 16848 REMARK 200 RESOLUTION RANGE HIGH (A) : 2.300 REMARK 200 RESOLUTION RANGE LOW (A) : 19.880 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : 0.000 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 86.7 REMARK 200 DATA REDUNDANCY : NULL REMARK 200 R MERGE (I) : NULL REMARK 200 R SYM (I) : NULL REMARK 200 FOR THE DATA SET : NULL REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 2.30 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 2.38 REMARK 200 COMPLETENESS FOR SHELL (%) : 48.1 REMARK 200 DATA REDUNDANCY IN SHELL : NULL REMARK 200 R MERGE FOR SHELL (I) : NULL REMARK 200 R SYM FOR SHELL (I) : NULL REMARK 200 FOR SHELL : NULL REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: FOURIER SYNTHESIS REMARK 200 SOFTWARE USED: CNS REMARK 200 STARTING MODEL: NULL REMARK 200 REMARK 200 REMARK: NULL REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 56.18 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.83 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: PEG 8000, MAGNESIUM CHLORIDE, TRIS REMARK 280 BUFFER, PH 7.5, VAPOR DIFFUSION, HANGING DROP, TEMPERATURE 277K REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: C 2 2 21 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -X,-Y,Z+1/2 REMARK 290 3555 -X,Y,-Z+1/2 REMARK 290 4555 X,-Y,-Z REMARK 290 5555 X+1/2,Y+1/2,Z REMARK 290 6555 -X+1/2,-Y+1/2,Z+1/2 REMARK 290 7555 -X+1/2,Y+1/2,-Z+1/2 REMARK 290 8555 X+1/2,-Y+1/2,-Z REMARK 290 REMARK 290 WHERE NNN -> OPERATOR NUMBER REMARK 290 MMM -> TRANSLATION VECTOR REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY TRANSFORMATIONS REMARK 290 THE FOLLOWING TRANSFORMATIONS OPERATE ON THE ATOM/HETATM REMARK 290 RECORDS IN THIS ENTRY TO PRODUCE CRYSTALLOGRAPHICALLY REMARK 290 RELATED MOLECULES. REMARK 290 SMTRY1 1 1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 1 0.000000 1.000000 0.000000 0.00000 REMARK 290 SMTRY3 1 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 2 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 2 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 44.94800 REMARK 290 SMTRY1 3 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 0.00000 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 44.94800 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 4 0.000000 0.000000 -1.000000 0.00000 REMARK 290 SMTRY1 5 1.000000 0.000000 0.000000 30.06100 REMARK 290 SMTRY2 5 0.000000 1.000000 0.000000 77.81600 REMARK 290 SMTRY3 5 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 6 -1.000000 0.000000 0.000000 30.06100 REMARK 290 SMTRY2 6 0.000000 -1.000000 0.000000 77.81600 REMARK 290 SMTRY3 6 0.000000 0.000000 1.000000 44.94800 REMARK 290 SMTRY1 7 -1.000000 0.000000 0.000000 30.06100 REMARK 290 SMTRY2 7 0.000000 1.000000 0.000000 77.81600 REMARK 290 SMTRY3 7 0.000000 0.000000 -1.000000 44.94800 REMARK 290 SMTRY1 8 1.000000 0.000000 0.000000 30.06100 REMARK 290 SMTRY2 8 0.000000 -1.000000 0.000000 77.81600 REMARK 290 SMTRY3 8 0.000000 0.000000 -1.000000 0.00000 REMARK 290 REMARK 290 REMARK: NULL REMARK 300 REMARK 300 BIOMOLECULE: 1 REMARK 300 SEE REMARK 350 FOR THE AUTHOR PROVIDED AND/OR PROGRAM REMARK 300 GENERATED ASSEMBLY INFORMATION FOR THE STRUCTURE IN REMARK 300 THIS ENTRY. THE REMARK MAY ALSO PROVIDE INFORMATION ON REMARK 300 BURIED SURFACE AREA. REMARK 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 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 ILE A 665 REMARK 465 GLN A 666 REMARK 465 ARG A 667 REMARK 465 SER A 668 REMARK 465 GLU A 669 REMARK 465 HIS A 670 REMARK 465 PRO A 671 REMARK 465 LEU A 672 REMARK 465 ALA A 673 REMARK 465 GLN A 674 REMARK 465 LEU A 675 REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: TORSION ANGLES REMARK 500 REMARK 500 TORSION ANGLES OUTSIDE THE EXPECTED RAMACHANDRAN REGIONS: REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE). REMARK 500 REMARK 500 STANDARD TABLE: REMARK 500 FORMAT:(10X,I3,1X,A3,1X,A1,I4,A1,4X,F7.2,3X,F7.2) REMARK 500 REMARK 500 EXPECTED VALUES: GJ KLEYWEGT AND TA JONES (1996). PHI/PSI- REMARK 500 CHOLOGY: RAMACHANDRAN REVISITED. STRUCTURE 4, 1395 - 1400 REMARK 500 REMARK 500 M RES CSSEQI PSI PHI REMARK 500 PHE A 564 -36.59 -34.02 REMARK 500 LYS A 630 -71.61 -87.10 REMARK 500 ASN A 662 -154.82 -105.46 REMARK 500 SER A 663 -55.46 -128.18 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 A1002 MG REMARK 620 N RES CSSEQI ATOM REMARK 620 1 HOH A 29 O REMARK 620 2 HOH A 72 O 88.6 REMARK 620 3 HOH A 73 O 87.2 77.1 REMARK 620 4 HOH A 76 O 114.3 156.7 99.1 REMARK 620 5 HOH A 77 O 171.1 100.3 94.0 56.8 REMARK 620 6 ASP A 654 OD1 88.0 82.1 158.7 101.9 94.0 REMARK 620 N 1 2 3 4 5 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 ZN A1001 ZN REMARK 620 N RES CSSEQI ATOM REMARK 620 1 HOH A 77 O REMARK 620 2 HOH A 78 O 80.7 REMARK 620 3 HIS A 617 NE2 162.8 83.9 REMARK 620 4 HIS A 653 NE2 101.7 170.7 92.5 REMARK 620 5 ASP A 654 OD2 99.0 103.8 91.9 84.8 REMARK 620 6 ASP A 764 OD1 86.1 88.3 86.0 82.9 167.4 REMARK 620 N 1 2 3 4 5 REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ZN A 1001 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 1002 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC3 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE VIA A 1000 REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: 1UDU RELATED DB: PDB REMARK 900 THE SAME PROTEIN COMPLEXED WITH TADALAFIL(CIALIS) DBREF 1UDT A 537 860 UNP O76074 PDE5A_HUMAN 537 860 SEQRES 1 A 324 THR ARG GLU LEU GLN SER LEU ALA ALA ALA VAL VAL PRO SEQRES 2 A 324 SER ALA GLN THR LEU LYS ILE THR ASP PHE SER PHE SER SEQRES 3 A 324 ASP PHE GLU LEU SER ASP LEU GLU THR ALA LEU CYS THR SEQRES 4 A 324 ILE ARG MET PHE THR ASP LEU ASN LEU VAL GLN ASN PHE SEQRES 5 A 324 GLN MET LYS HIS GLU VAL LEU CYS ARG TRP ILE LEU SER SEQRES 6 A 324 VAL LYS LYS ASN TYR ARG LYS ASN VAL ALA TYR HIS ASN SEQRES 7 A 324 TRP ARG HIS ALA PHE ASN THR ALA GLN CYS MET PHE ALA SEQRES 8 A 324 ALA LEU LYS ALA GLY LYS ILE GLN ASN LYS LEU THR ASP SEQRES 9 A 324 LEU GLU ILE LEU ALA LEU LEU ILE ALA ALA LEU SER HIS SEQRES 10 A 324 ASP LEU ASP HIS ARG GLY VAL ASN ASN SER TYR ILE GLN SEQRES 11 A 324 ARG SER GLU HIS PRO LEU ALA GLN LEU TYR CYS HIS SER SEQRES 12 A 324 ILE MET GLU HIS HIS HIS PHE ASP GLN CYS LEU MET ILE SEQRES 13 A 324 LEU ASN SER PRO GLY ASN GLN ILE LEU SER GLY LEU SER SEQRES 14 A 324 ILE GLU GLU TYR LYS THR THR LEU LYS ILE ILE LYS GLN SEQRES 15 A 324 ALA ILE LEU ALA THR ASP LEU ALA LEU TYR ILE LYS ARG SEQRES 16 A 324 ARG GLY GLU PHE PHE GLU LEU ILE ARG LYS ASN GLN PHE SEQRES 17 A 324 ASN LEU GLU ASP PRO HIS GLN LYS GLU LEU PHE LEU ALA SEQRES 18 A 324 MET LEU MET THR ALA CYS ASP LEU SER ALA ILE THR LYS SEQRES 19 A 324 PRO TRP PRO ILE GLN GLN ARG ILE ALA GLU LEU VAL ALA SEQRES 20 A 324 THR GLU PHE PHE ASP GLN GLY ASP ARG GLU ARG LYS GLU SEQRES 21 A 324 LEU ASN ILE GLU PRO THR ASP LEU MET ASN ARG GLU LYS SEQRES 22 A 324 LYS ASN LYS ILE PRO SER MET GLN VAL GLY PHE ILE ASP SEQRES 23 A 324 ALA ILE CYS LEU GLN LEU TYR GLU ALA LEU THR HIS VAL SEQRES 24 A 324 SER GLU ASP CYS PHE PRO LEU LEU ASP GLY CYS ARG LYS SEQRES 25 A 324 ASN ARG GLN LYS TRP GLN ALA LEU ALA GLU GLN GLN HET ZN A1001 1 HET MG A1002 1 HET VIA A1000 33 HETNAM ZN ZINC ION HETNAM MG MAGNESIUM ION HETNAM VIA 5-{2-ETHOXY-5-[(4-METHYLPIPERAZIN-1-YL) HETNAM 2 VIA SULFONYL]PHENYL}-1-METHYL-3-PROPYL-1H,6H,7H- HETNAM 3 VIA PYRAZOLO[4,3-D]PYRIMIDIN-7-ONE HETSYN VIA SILDENAFIL; VIAGRA FORMUL 2 ZN ZN 2+ FORMUL 3 MG MG 2+ FORMUL 4 VIA C22 H30 N6 O4 S FORMUL 5 HOH *78(H2 O) HELIX 1 1 THR A 537 ALA A 546 1 10 HELIX 2 2 SER A 550 LYS A 555 1 6 HELIX 3 3 SER A 567 LEU A 582 1 16 HELIX 4 4 ASN A 583 PHE A 588 1 6 HELIX 5 5 LYS A 591 ASN A 605 1 15 HELIX 6 6 ASN A 614 ALA A 631 1 18 HELIX 7 7 ILE A 634 LEU A 638 5 5 HELIX 8 8 THR A 639 HIS A 653 1 15 HELIX 9 9 SER A 679 SER A 695 1 17 HELIX 10 10 SER A 705 THR A 723 1 19 HELIX 11 11 ASP A 724 ASN A 742 1 19 HELIX 12 12 ASP A 748 LEU A 765 1 18 HELIX 13 13 SER A 766 LYS A 770 5 5 HELIX 14 14 PRO A 771 LEU A 797 1 27 HELIX 15 15 LYS A 809 ASN A 811 5 3 HELIX 16 16 LYS A 812 ILE A 824 1 13 HELIX 17 17 CYS A 825 SER A 836 1 12 HELIX 18 18 CYS A 839 GLN A 860 1 22 LINK O HOH A 29 MG MG A1002 1555 1555 2.04 LINK O HOH A 72 MG MG A1002 1555 1555 2.09 LINK O HOH A 73 MG MG A1002 1555 1555 1.98 LINK O HOH A 76 MG MG A1002 1555 1555 2.17 LINK O HOH A 77 ZN ZN A1001 1555 1555 1.92 LINK O HOH A 77 MG MG A1002 1555 1555 2.58 LINK O HOH A 78 ZN ZN A1001 1555 1555 2.34 LINK NE2 HIS A 617 ZN ZN A1001 1555 1555 2.16 LINK NE2 HIS A 653 ZN ZN A1001 1555 1555 2.13 LINK OD2 ASP A 654 ZN ZN A1001 1555 1555 2.10 LINK OD1 ASP A 654 MG MG A1002 1555 1555 2.06 LINK OD1 ASP A 764 ZN ZN A1001 1555 1555 2.31 SITE 1 AC1 6 HOH A 77 HOH A 78 HIS A 617 HIS A 653 SITE 2 AC1 6 ASP A 654 ASP A 764 SITE 1 AC2 6 HOH A 29 HOH A 72 HOH A 73 HOH A 76 SITE 2 AC2 6 HOH A 77 ASP A 654 SITE 1 AC3 12 HOH A 75 TYR A 612 ASN A 661 TYR A 664 SITE 2 AC3 12 ALA A 779 ALA A 783 LEU A 804 MET A 816 SITE 3 AC3 12 GLN A 817 GLY A 819 PHE A 820 GLU A 858 CRYST1 60.122 155.632 89.896 90.00 90.00 90.00 C 2 2 21 8 ORIGX1 1.000000 0.000000 0.000000 0.00000 ORIGX2 0.000000 1.000000 0.000000 0.00000 ORIGX3 0.000000 0.000000 1.000000 0.00000 SCALE1 0.016633 0.000000 0.000000 0.00000 SCALE2 0.000000 0.006425 0.000000 0.00000 SCALE3 0.000000 0.000000 0.011124 0.00000