2G6N - Header Asymmetric Unit

HEADER OXIDOREDUCTASE 24-FEB-06 2G6N

TITLE STRCTURE OF RAT NNOS HEME DOMAIN (BH2 BOUND) COMPLEXED WITH TITLE 2 CO

COMPND MOL_ID: 1; COMPND 2 MOLECULE: NITRIC-OXIDE SYNTHASE, BRAIN; COMPND 3 CHAIN: A, B; COMPND 4 SYNONYM: NOS TYPE I, NEURONAL NOS, N-NOS, NNOS, COMPND 5 CONSTITUTIVE NOS, NC-NOS, BNOS; COMPND 6 EC: 1.14.13.39; COMPND 7 ENGINEERED: YES

SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: RATTUS NORVEGICUS; SOURCE 3 ORGANISM_COMMON: NORWAY RAT; SOURCE 4 ORGANISM_TAXID: 10116; SOURCE 5 GENE: NOS1, BNOS; SOURCE 6 EXPRESSION_SYSTEM: ESCHERICHIA COLI BL21(DE3); SOURCE 7 EXPRESSION_SYSTEM_TAXID: 469008; SOURCE 8 EXPRESSION_SYSTEM_STRAIN: BL21(DE3); SOURCE 9 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID; SOURCE 10 EXPRESSION_SYSTEM_PLASMID: PCWORI

KEYWDS NITRIC OXIDE SYNTHASE, HEME PROTEIN, DIATOMIC LIGAND, KEYWDS 2 OXIDOREDUCTASE

EXPDTA X-RAY DIFFRACTION

AUTHOR H.LI,J.IGARASHI,J.JAMAL,W.YANG,T.L.POULOS

REVDAT 2 24-FEB-09 2G6N 1 VERSN REVDAT 1 08-AUG-06 2G6N 0

JRNL AUTH H.LI,J.IGARASHI,J.JAMAL,W.YANG,T.L.POULOS JRNL TITL STRUCTURAL STUDIES OF CONSTITUTIVE NITRIC OXIDE JRNL TITL 2 SYNTHASES WITH DIATOMIC LIGANDS BOUND. JRNL REF J.BIOL.INORG.CHEM. V. 11 753 2006 JRNL REFN ISSN 0949-8257 JRNL PMID 16804678 JRNL DOI 10.1007/S00775-006-0123-8

REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH H.LI,C.S.RAMAN,P.MARTASEK,B.S.MASTERS,T.L.POULOS REMARK 1 TITL CRYSTALLOGRAPHIC STUDIES ON ENDOTHELIAL NITRIC REMARK 1 TITL 2 OXIDE SYNTHASE COMPLEXED WITH NITRIC OXIDE AND REMARK 1 TITL 3 MECHANISM-BASED INHIBITORS. REMARK 1 REF BIOCHEMISTRY V. 40 5399 2001 REMARK 1 REFN ISSN 0006-2960 REMARK 1 PMID 11331003 REMARK 1 DOI 10.1021/BI002658V

REMARK 2 REMARK 2 RESOLUTION. 1.90 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) : 1.90 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 49.55 REMARK 3 DATA CUTOFF (SIGMA(F)) : 0.000 REMARK 3 DATA CUTOFF HIGH (ABS(F)) : 2434071.150 REMARK 3 DATA CUTOFF LOW (ABS(F)) : 0.0000 REMARK 3 COMPLETENESS (WORKING+TEST) (%) : 98.3 REMARK 3 NUMBER OF REFLECTIONS : 74825 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) : 0.227 REMARK 3 FREE R VALUE : 0.262 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 5.000 REMARK 3 FREE R VALUE TEST SET COUNT : 3745 REMARK 3 ESTIMATED ERROR OF FREE R VALUE : 0.004 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) : 1.90 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 2.02 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 95.30 REMARK 3 REFLECTIONS IN BIN (WORKING SET) : 11327 REMARK 3 BIN R VALUE (WORKING SET) : 0.3100 REMARK 3 BIN FREE R VALUE : 0.3350 REMARK 3 BIN FREE R VALUE TEST SET SIZE (%) : 5.10 REMARK 3 BIN FREE R VALUE TEST SET COUNT : 608 REMARK 3 ESTIMATED ERROR OF BIN FREE R VALUE : 0.014 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 6676 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 157 REMARK 3 SOLVENT ATOMS : 450 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : 23.10 REMARK 3 MEAN B VALUE (OVERALL, A**2) : 39.00 REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : 5.66000 REMARK 3 B22 (A**2) : 7.18000 REMARK 3 B33 (A**2) : -12.84000 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) : 0.26 REMARK 3 ESD FROM SIGMAA (A) : 0.27 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) : 0.31 REMARK 3 ESD FROM C-V SIGMAA (A) : 0.30 REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 BOND LENGTHS (A) : 0.008 REMARK 3 BOND ANGLES (DEGREES) : 1.40 REMARK 3 DIHEDRAL ANGLES (DEGREES) : 22.30 REMARK 3 IMPROPER ANGLES (DEGREES) : 1.04 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) : 1.380 ; 1.500 REMARK 3 MAIN-CHAIN ANGLE (A**2) : 2.130 ; 2.000 REMARK 3 SIDE-CHAIN BOND (A**2) : 2.380 ; 2.000 REMARK 3 SIDE-CHAIN ANGLE (A**2) : 3.090 ; 2.500 REMARK 3 REMARK 3 BULK SOLVENT MODELING. REMARK 3 METHOD USED : FLAT MODEL REMARK 3 KSOL : 0.37 REMARK 3 BSOL : 46.25 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 : HETERO2.PAR REMARK 3 PARAMETER FILE 3 : WATER_REP.PARAM REMARK 3 PARAMETER FILE 5 : BH2.PAR REMARK 3 PARAMETER FILE 6 : NULL REMARK 3 TOPOLOGY FILE 1 : PROTEIN.TOP REMARK 3 TOPOLOGY FILE 2 : HETERO2.TOP REMARK 3 TOPOLOGY FILE 3 : WATER_REP.TOP REMARK 3 TOPOLOGY FILE 5 : BH2.TOP REMARK 3 TOPOLOGY FILE 6 : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NULL

REMARK 4 REMARK 4 2G6N COMPLIES WITH FORMAT V. 3.15, 01-DEC-08

REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 14-MAR-06. REMARK 100 THE RCSB ID CODE IS RCSB036754.

REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : 14-SEP-05 REMARK 200 TEMPERATURE (KELVIN) : 100 REMARK 200 PH : 5.6 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y REMARK 200 RADIATION SOURCE : ALS REMARK 200 BEAMLINE : 5.0.2 REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 1.00 REMARK 200 MONOCHROMATOR : GRAPHITE REMARK 200 OPTICS : MIRRORS REMARK 200 REMARK 200 DETECTOR TYPE : CCD REMARK 200 DETECTOR MANUFACTURER : ADSC QUANTUM 315 REMARK 200 INTENSITY-INTEGRATION SOFTWARE : HKL-2000 REMARK 200 DATA SCALING SOFTWARE : SCALEPACK REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 74863 REMARK 200 RESOLUTION RANGE HIGH (A) : 1.900 REMARK 200 RESOLUTION RANGE LOW (A) : 50.000 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : -3.000 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 1.0 REMARK 200 DATA REDUNDANCY : 4.800 REMARK 200 R MERGE (I) : 0.05800 REMARK 200 R SYM (I) : 0.05800 REMARK 200 <I/SIGMA(I)> FOR THE DATA SET : 13.4000 REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.90 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 1.93 REMARK 200 COMPLETENESS FOR SHELL (%) : 1.0 REMARK 200 DATA REDUNDANCY IN SHELL : 4.80 REMARK 200 R MERGE FOR SHELL (I) : 0.62500 REMARK 200 R SYM FOR SHELL (I) : 0.62500 REMARK 200 <I/SIGMA(I)> FOR SHELL : 2.500 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: PDB ENTRY 1OM4 REMARK 200 REMARK 200 REMARK: NULL

REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 49.77 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.45 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: PEG3350, MES, AMMONIUM ACETATE, REMARK 280 GSH, SDS, PH 5.6, VAPOR DIFFUSION, SITTING DROP, TEMPERATURE REMARK 280 280K

REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 21 21 21 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -X+1/2,-Y,Z+1/2 REMARK 290 3555 -X,Y+1/2,-Z+1/2 REMARK 290 4555 X+1/2,-Y+1/2,-Z REMARK 290 REMARK 290 WHERE NNN -> OPERATOR NUMBER REMARK 290 MMM -> TRANSLATION VECTOR REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY TRANSFORMATIONS REMARK 290 THE FOLLOWING TRANSFORMATIONS OPERATE ON THE ATOM/HETATM REMARK 290 RECORDS IN THIS ENTRY TO PRODUCE CRYSTALLOGRAPHICALLY REMARK 290 RELATED MOLECULES. REMARK 290 SMTRY1 1 1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 1 0.000000 1.000000 0.000000 0.00000 REMARK 290 SMTRY3 1 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 2 -1.000000 0.000000 0.000000 25.98500 REMARK 290 SMTRY2 2 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 82.18500 REMARK 290 SMTRY1 3 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 55.76500 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 82.18500 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 25.98500 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 55.76500 REMARK 290 SMTRY3 4 0.000000 0.000000 -1.000000 0.00000 REMARK 290 REMARK 290 REMARK: NULL

REMARK 300 REMARK 300 BIOMOLECULE: 1 REMARK 300 SEE REMARK 350 FOR THE AUTHOR PROVIDED AND/OR PROGRAM REMARK 300 GENERATED ASSEMBLY INFORMATION FOR THE STRUCTURE IN REMARK 300 THIS ENTRY. THE REMARK MAY ALSO PROVIDE INFORMATION ON REMARK 300 BURIED SURFACE AREA.

REMARK 350 REMARK 350 COORDINATES FOR A COMPLETE MULTIMER REPRESENTING THE KNOWN REMARK 350 BIOLOGICALLY SIGNIFICANT OLIGOMERIZATION STATE OF THE REMARK 350 MOLECULE CAN BE GENERATED BY APPLYING BIOMT TRANSFORMATIONS REMARK 350 GIVEN BELOW. BOTH NON-CRYSTALLOGRAPHIC AND REMARK 350 CRYSTALLOGRAPHIC OPERATIONS ARE GIVEN. REMARK 350 REMARK 350 BIOMOLECULE: 1 REMARK 350 AUTHOR DETERMINED BIOLOGICAL UNIT: DIMERIC REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: DIMERIC REMARK 350 SOFTWARE USED: PISA REMARK 350 TOTAL BURIED SURFACE AREA: 11010 ANGSTROM**2 REMARK 350 SURFACE AREA OF THE COMPLEX: 32920 ANGSTROM**2 REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -84.0 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 SER A 339 REMARK 465 GLN A 340 REMARK 465 HIS A 341 REMARK 465 THR A 342 REMARK 465 ARG A 343 REMARK 465 LYS A 344 REMARK 465 PRO A 345 REMARK 465 GLU A 346 REMARK 465 ASP A 347 REMARK 465 LYS A 717 REMARK 465 GLY A 718 REMARK 465 SER B 339 REMARK 465 GLN B 340 REMARK 465 HIS B 341 REMARK 465 THR B 342 REMARK 465 ARG B 343 REMARK 465 LYS B 344 REMARK 465 PRO B 345 REMARK 465 GLU B 346 REMARK 465 ASP B 347

REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: CLOSE CONTACTS IN SAME ASYMMETRIC UNIT REMARK 500 REMARK 500 THE FOLLOWING ATOMS ARE IN CLOSE CONTACT. REMARK 500 REMARK 500 ATM1 RES C SSEQI ATM2 RES C SSEQI DISTANCE REMARK 500 N GLU A 608 O HOH A 1079 2.07 REMARK 500 O HOH A 1067 O HOH A 1103 2.07 REMARK 500 O ASP A 556 O HOH A 1075 2.12 REMARK 500 O HOH A 1049 O HOH B 1123 2.18 REMARK 500 OG SER A 643 O HOH A 1083 2.19 REMARK 500 O GLU A 543 O HOH A 1073 2.19 REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: COVALENT BOND ANGLES REMARK 500 REMARK 500 THE STEREOCHEMICAL PARAMETERS OF THE FOLLOWING RESIDUES REMARK 500 HAVE VALUES WHICH DEVIATE FROM EXPECTED VALUES BY MORE REMARK 500 THAN 6*RMSD (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN REMARK 500 IDENTIFIER; SSEQ=SEQUENCE NUMBER; I=INSERTION CODE). REMARK 500 REMARK 500 STANDARD TABLE: REMARK 500 FORMAT: (10X,I3,1X,A3,1X,A1,I4,A1,3(1X,A4,2X),12X,F5.1) REMARK 500 REMARK 500 EXPECTED VALUES PROTEIN: ENGH AND HUBER, 1999 REMARK 500 EXPECTED VALUES NUCLEIC ACID: CLOWNEY ET AL 1996 REMARK 500 REMARK 500 M RES CSSEQI ATM1 ATM2 ATM3 REMARK 500 CYS B 326 CA - CB - SG ANGL. DEV. = 11.6 DEGREES REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: TORSION ANGLES REMARK 500 REMARK 500 TORSION ANGLES OUTSIDE THE EXPECTED RAMACHANDRAN REGIONS: REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE). REMARK 500 REMARK 500 STANDARD TABLE: REMARK 500 FORMAT:(10X,I3,1X,A3,1X,A1,I4,A1,4X,F7.2,3X,F7.2) REMARK 500 REMARK 500 EXPECTED VALUES: GJ KLEYWEGT AND TA JONES (1996). PHI/PSI- REMARK 500 CHOLOGY: RAMACHANDRAN REVISITED. STRUCTURE 4, 1395 - 1400 REMARK 500 REMARK 500 M RES CSSEQI PSI PHI REMARK 500 ASP A 309 -5.48 63.94 REMARK 500 ARG A 371 42.57 -141.33 REMARK 500 SER A 390 -72.37 -85.63 REMARK 500 THR A 393 -172.46 167.73 REMARK 500 ALA A 412 93.99 -68.74 REMARK 500 THR A 433 -13.46 -141.14 REMARK 500 THR A 466 -66.24 -124.11 REMARK 500 SER A 491 -168.14 -70.40 REMARK 500 GLN A 500 -70.43 -62.64 REMARK 500 ASN A 527 14.90 57.58 REMARK 500 PRO A 549 5.57 -67.71 REMARK 500 LYS A 550 -26.35 -152.52 REMARK 500 CYS A 582 58.66 -146.91 REMARK 500 ARG A 603 -130.56 -117.52 REMARK 500 ASN A 605 64.02 37.92 REMARK 500 TRP A 711 11.98 -66.95 REMARK 500 THR A 713 -28.25 -150.31 REMARK 500 HIS A 714 -178.18 -61.67 REMARK 500 VAL A 715 90.35 -166.37 REMARK 500 ASP B 309 -2.44 58.13 REMARK 500 SER B 374 176.37 -57.33 REMARK 500 THR B 393 -162.05 -161.42 REMARK 500 ALA B 412 98.82 -69.94 REMARK 500 THR B 466 -80.43 -119.64 REMARK 500 CYS B 582 53.65 -144.71 REMARK 500 VAL B 595 -60.01 -94.74 REMARK 500 ARG B 603 -131.96 -119.08 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 HEM A 750 FE REMARK 620 N RES CSSEQI ATOM REMARK 620 1 CYS A 415 SG REMARK 620 2 CMO A 920 C 170.1 REMARK 620 3 CMO A 920 O 168.3 2.0 REMARK 620 N 1 2 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 HEM B 750 FE REMARK 620 N RES CSSEQI ATOM REMARK 620 1 CYS B 415 SG REMARK 620 2 CMO B 920 C 171.7 REMARK 620 3 CMO B 920 O 169.6 2.3 REMARK 620 N 1 2 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 ZN A 900 ZN REMARK 620 N RES CSSEQI ATOM REMARK 620 1 CYS A 326 SG REMARK 620 2 CYS B 331 SG 103.0 REMARK 620 3 CYS B 326 SG 121.1 114.2 REMARK 620 4 CYS A 331 SG 112.9 100.0 103.8 REMARK 620 N 1 2 3

REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ACT A 860 REMARK 800 SITE_IDENTIFIER: AC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ACT B 861 REMARK 800 SITE_IDENTIFIER: AC3 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ZN A 900 REMARK 800 SITE_IDENTIFIER: AC4 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE HEM A 750 REMARK 800 SITE_IDENTIFIER: AC5 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE HBI A 760 REMARK 800 SITE_IDENTIFIER: AC6 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ARG A 770 REMARK 800 SITE_IDENTIFIER: AC7 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE CMO A 920 REMARK 800 SITE_IDENTIFIER: AC8 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE HEM B 750 REMARK 800 SITE_IDENTIFIER: AC9 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE HBI B 761 REMARK 800 SITE_IDENTIFIER: BC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ARG B 771 REMARK 800 SITE_IDENTIFIER: BC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE CMO B 920

DBREF 2G6N A 299 718 UNP P29476 NOS1_RAT 299 718 DBREF 2G6N B 299 718 UNP P29476 NOS1_RAT 299 718

SEQRES 1 A 420 ARG PHE LEU LYS VAL LYS ASN TRP GLU THR ASP VAL VAL SEQRES 2 A 420 LEU THR ASP THR LEU HIS LEU LYS SER THR LEU GLU THR SEQRES 3 A 420 GLY CYS THR GLU HIS ILE CYS MET GLY SER ILE MET LEU SEQRES 4 A 420 PRO SER GLN HIS THR ARG LYS PRO GLU ASP VAL ARG THR SEQRES 5 A 420 LYS ASP GLN LEU PHE PRO LEU ALA LYS GLU PHE LEU ASP SEQRES 6 A 420 GLN TYR TYR SER SER ILE LYS ARG PHE GLY SER LYS ALA SEQRES 7 A 420 HIS MET ASP ARG LEU GLU GLU VAL ASN LYS GLU ILE GLU SEQRES 8 A 420 SER THR SER THR TYR GLN LEU LYS ASP THR GLU LEU ILE SEQRES 9 A 420 TYR GLY ALA LYS HIS ALA TRP ARG ASN ALA SER ARG CYS SEQRES 10 A 420 VAL GLY ARG ILE GLN TRP SER LYS LEU GLN VAL PHE ASP SEQRES 11 A 420 ALA ARG ASP CYS THR THR ALA HIS GLY MET PHE ASN TYR SEQRES 12 A 420 ILE CYS ASN HIS VAL LYS TYR ALA THR ASN LYS GLY ASN SEQRES 13 A 420 LEU ARG SER ALA ILE THR ILE PHE PRO GLN ARG THR ASP SEQRES 14 A 420 GLY LYS HIS ASP PHE ARG VAL TRP ASN SER GLN LEU ILE SEQRES 15 A 420 ARG TYR ALA GLY TYR LYS GLN PRO ASP GLY SER THR LEU SEQRES 16 A 420 GLY ASP PRO ALA ASN VAL GLN PHE THR GLU ILE CYS ILE SEQRES 17 A 420 GLN GLN GLY TRP LYS ALA PRO ARG GLY ARG PHE ASP VAL SEQRES 18 A 420 LEU PRO LEU LEU LEU GLN ALA ASN GLY ASN ASP PRO GLU SEQRES 19 A 420 LEU PHE GLN ILE PRO PRO GLU LEU VAL LEU GLU VAL PRO SEQRES 20 A 420 ILE ARG HIS PRO LYS PHE ASP TRP PHE LYS ASP LEU GLY SEQRES 21 A 420 LEU LYS TRP TYR GLY LEU PRO ALA VAL SER ASN MET LEU SEQRES 22 A 420 LEU GLU ILE GLY GLY LEU GLU PHE SER ALA CYS PRO PHE SEQRES 23 A 420 SER GLY TRP TYR MET GLY THR GLU ILE GLY VAL ARG ASP SEQRES 24 A 420 TYR CYS ASP ASN SER ARG TYR ASN ILE LEU GLU GLU VAL SEQRES 25 A 420 ALA LYS LYS MET ASP LEU ASP MET ARG LYS THR SER SER SEQRES 26 A 420 LEU TRP LYS ASP GLN ALA LEU VAL GLU ILE ASN ILE ALA SEQRES 27 A 420 VAL LEU TYR SER PHE GLN SER ASP LYS VAL THR ILE VAL SEQRES 28 A 420 ASP HIS HIS SER ALA THR GLU SER PHE ILE LYS HIS MET SEQRES 29 A 420 GLU ASN GLU TYR ARG CYS ARG GLY GLY CYS PRO ALA ASP SEQRES 30 A 420 TRP VAL TRP ILE VAL PRO PRO MET SER GLY SER ILE THR SEQRES 31 A 420 PRO VAL PHE HIS GLN GLU MET LEU ASN TYR ARG LEU THR SEQRES 32 A 420 PRO SER PHE GLU TYR GLN PRO ASP PRO TRP ASN THR HIS SEQRES 33 A 420 VAL TRP LYS GLY SEQRES 1 B 420 ARG PHE LEU LYS VAL LYS ASN TRP GLU THR ASP VAL VAL SEQRES 2 B 420 LEU THR ASP THR LEU HIS LEU LYS SER THR LEU GLU THR SEQRES 3 B 420 GLY CYS THR GLU HIS ILE CYS MET GLY SER ILE MET LEU SEQRES 4 B 420 PRO SER GLN HIS THR ARG LYS PRO GLU ASP VAL ARG THR SEQRES 5 B 420 LYS ASP GLN LEU PHE PRO LEU ALA LYS GLU PHE LEU ASP SEQRES 6 B 420 GLN TYR TYR SER SER ILE LYS ARG PHE GLY SER LYS ALA SEQRES 7 B 420 HIS MET ASP ARG LEU GLU GLU VAL ASN LYS GLU ILE GLU SEQRES 8 B 420 SER THR SER THR TYR GLN LEU LYS ASP THR GLU LEU ILE SEQRES 9 B 420 TYR GLY ALA LYS HIS ALA TRP ARG ASN ALA SER ARG CYS SEQRES 10 B 420 VAL GLY ARG ILE GLN TRP SER LYS LEU GLN VAL PHE ASP SEQRES 11 B 420 ALA ARG ASP CYS THR THR ALA HIS GLY MET PHE ASN TYR SEQRES 12 B 420 ILE CYS ASN HIS VAL LYS TYR ALA THR ASN LYS GLY ASN SEQRES 13 B 420 LEU ARG SER ALA ILE THR ILE PHE PRO GLN ARG THR ASP SEQRES 14 B 420 GLY LYS HIS ASP PHE ARG VAL TRP ASN SER GLN LEU ILE SEQRES 15 B 420 ARG TYR ALA GLY TYR LYS GLN PRO ASP GLY SER THR LEU SEQRES 16 B 420 GLY ASP PRO ALA ASN VAL GLN PHE THR GLU ILE CYS ILE SEQRES 17 B 420 GLN GLN GLY TRP LYS ALA PRO ARG GLY ARG PHE ASP VAL SEQRES 18 B 420 LEU PRO LEU LEU LEU GLN ALA ASN GLY ASN ASP PRO GLU SEQRES 19 B 420 LEU PHE GLN ILE PRO PRO GLU LEU VAL LEU GLU VAL PRO SEQRES 20 B 420 ILE ARG HIS PRO LYS PHE ASP TRP PHE LYS ASP LEU GLY SEQRES 21 B 420 LEU LYS TRP TYR GLY LEU PRO ALA VAL SER ASN MET LEU SEQRES 22 B 420 LEU GLU ILE GLY GLY LEU GLU PHE SER ALA CYS PRO PHE SEQRES 23 B 420 SER GLY TRP TYR MET GLY THR GLU ILE GLY VAL ARG ASP SEQRES 24 B 420 TYR CYS ASP ASN SER ARG TYR ASN ILE LEU GLU GLU VAL SEQRES 25 B 420 ALA LYS LYS MET ASP LEU ASP MET ARG LYS THR SER SER SEQRES 26 B 420 LEU TRP LYS ASP GLN ALA LEU VAL GLU ILE ASN ILE ALA SEQRES 27 B 420 VAL LEU TYR SER PHE GLN SER ASP LYS VAL THR ILE VAL SEQRES 28 B 420 ASP HIS HIS SER ALA THR GLU SER PHE ILE LYS HIS MET SEQRES 29 B 420 GLU ASN GLU TYR ARG CYS ARG GLY GLY CYS PRO ALA ASP SEQRES 30 B 420 TRP VAL TRP ILE VAL PRO PRO MET SER GLY SER ILE THR SEQRES 31 B 420 PRO VAL PHE HIS GLN GLU MET LEU ASN TYR ARG LEU THR SEQRES 32 B 420 PRO SER PHE GLU TYR GLN PRO ASP PRO TRP ASN THR HIS SEQRES 33 B 420 VAL TRP LYS GLY

HET ACT A 860 4 HET ACT B 861 4 HET ZN A 900 1 HET HEM A 750 43 HET HBI A 760 17 HET ARG A 770 12 HET CMO A 920 2 HET HEM B 750 43 HET HBI B 761 17 HET ARG B 771 12 HET CMO B 920 2

HETNAM ACT ACETATE ION HETNAM ZN ZINC ION HETNAM HEM PROTOPORPHYRIN IX CONTAINING FE HETNAM HBI 7,8-DIHYDROBIOPTERIN HETNAM ARG ARGININE HETNAM CMO CARBON MONOXIDE

HETSYN HEM HEME

FORMUL 3 ACT 2(C2 H3 O2 1-) FORMUL 5 ZN ZN 2+ FORMUL 6 HEM 2(C34 H32 FE N4 O4) FORMUL 7 HBI 2(C9 H13 N5 O3) FORMUL 8 ARG 2(C6 H15 N4 O2 1+) FORMUL 9 CMO 2(C O) FORMUL 14 HOH *450(H2 O)

HELIX 1 1 THR A 315 SER A 320 5 6 HELIX 2 2 THR A 350 ILE A 369 1 20 HELIX 3 3 SER A 374 SER A 392 1 19 HELIX 4 4 LYS A 397 ASN A 411 1 15 HELIX 5 5 GLY A 417 LEU A 424 5 8 HELIX 6 6 THR A 434 ASN A 451 1 18 HELIX 7 7 LYS A 452 ASN A 454 5 3 HELIX 8 8 ASN A 498 GLN A 508 1 11 HELIX 9 9 PRO A 537 VAL A 541 5 5 HELIX 10 10 TRP A 553 GLY A 558 5 6 HELIX 11 11 MET A 589 VAL A 595 1 7 HELIX 12 12 VAL A 595 ASP A 600 1 6 HELIX 13 13 ILE A 606 MET A 614 1 9 HELIX 14 14 LYS A 620 SER A 623 5 4 HELIX 15 15 LEU A 624 ASP A 644 1 21 HELIX 16 16 ASP A 650 GLY A 670 1 21 HELIX 17 17 ASP A 675 VAL A 680 1 6 HELIX 18 18 SER A 684 GLN A 693 5 10 HELIX 19 19 ASP A 709 THR A 713 5 5 HELIX 20 20 THR B 315 SER B 320 5 6 HELIX 21 21 THR B 350 ILE B 369 1 20 HELIX 22 22 SER B 374 SER B 392 1 19 HELIX 23 23 LYS B 397 ALA B 412 1 16 HELIX 24 24 GLY B 417 LEU B 424 5 8 HELIX 25 25 THR B 434 ASN B 451 1 18 HELIX 26 26 LYS B 452 ASN B 454 5 3 HELIX 27 27 ASN B 498 GLN B 508 1 11 HELIX 28 28 PRO B 537 VAL B 541 5 5 HELIX 29 29 PHE B 554 GLY B 558 5 5 HELIX 30 30 GLY B 590 VAL B 595 1 6 HELIX 31 31 VAL B 595 ASP B 600 1 6 HELIX 32 32 ILE B 606 MET B 614 1 9 HELIX 33 33 LYS B 620 SER B 623 5 4 HELIX 34 34 LEU B 624 ASP B 644 1 21 HELIX 35 35 ASP B 650 GLY B 670 1 21 HELIX 36 36 ASP B 675 VAL B 680 1 6 HELIX 37 37 SER B 684 GLN B 693 5 10 HELIX 38 38 ASP B 709 HIS B 714 1 6

SHEET 1 A 2 LEU A 301 LYS A 304 0 SHEET 2 A 2 VAL A 311 ASP A 314 -1 O ASP A 314 N LEU A 301 SHEET 1 B 3 GLN A 425 ASP A 428 0 SHEET 2 B 3 ALA A 458 ILE A 461 1 O ILE A 459 N PHE A 427 SHEET 3 B 3 PHE A 584 SER A 585 -1 O SER A 585 N ALA A 458 SHEET 1 C 3 ARG A 473 VAL A 474 0 SHEET 2 C 3 LEU A 522 GLN A 525 -1 O GLN A 525 N ARG A 473 SHEET 3 C 3 GLU A 532 PHE A 534 -1 O PHE A 534 N LEU A 522 SHEET 1 D 2 GLY A 484 LYS A 486 0 SHEET 2 D 2 THR A 492 GLY A 494 -1 O LEU A 493 N TYR A 485 SHEET 1 E 2 GLU A 543 PRO A 545 0 SHEET 2 E 2 LYS A 560 TYR A 562 -1 O TRP A 561 N VAL A 544 SHEET 1 F 3 LEU A 577 PHE A 579 0 SHEET 2 F 3 LEU A 571 ILE A 574 -1 N LEU A 572 O PHE A 579 SHEET 3 F 3 SER A 703 GLU A 705 -1 O GLU A 705 N LEU A 571 SHEET 1 G 2 LEU B 301 LYS B 304 0 SHEET 2 G 2 VAL B 311 ASP B 314 -1 O ASP B 314 N LEU B 301 SHEET 1 H 4 GLN B 425 ASP B 428 0 SHEET 2 H 4 ALA B 458 ILE B 461 1 O ILE B 459 N PHE B 427 SHEET 3 H 4 PHE B 584 SER B 585 -1 O SER B 585 N ALA B 458 SHEET 4 H 4 ALA B 566 VAL B 567 -1 N VAL B 567 O PHE B 584 SHEET 1 I 3 ARG B 473 VAL B 474 0 SHEET 2 I 3 LEU B 522 GLN B 525 -1 O GLN B 525 N ARG B 473 SHEET 3 I 3 GLU B 532 PHE B 534 -1 O PHE B 534 N LEU B 522 SHEET 1 J 2 GLY B 484 LYS B 486 0 SHEET 2 J 2 THR B 492 GLY B 494 -1 O LEU B 493 N TYR B 485 SHEET 1 K 2 GLU B 543 PRO B 545 0 SHEET 2 K 2 LYS B 560 TYR B 562 -1 O TRP B 561 N VAL B 544 SHEET 1 L 3 LEU B 577 PHE B 579 0 SHEET 2 L 3 LEU B 571 ILE B 574 -1 N LEU B 572 O PHE B 579 SHEET 3 L 3 SER B 703 GLU B 705 -1 O SER B 703 N GLU B 573 SHEET 1 M 2 TYR B 588 MET B 589 0 SHEET 2 M 2 ILE B 648 VAL B 649 1 O VAL B 649 N TYR B 588

LINK FE HEM A 750 SG CYS A 415 1555 1555 2.39 LINK FE HEM B 750 SG CYS B 415 1555 1555 2.39 LINK FE HEM A 750 C CMO A 920 1555 1555 1.73 LINK FE HEM B 750 C CMO B 920 1555 1555 1.71 LINK FE HEM A 750 O CMO A 920 1555 1555 2.87 LINK ZN ZN A 900 SG CYS A 326 1555 1555 2.29 LINK ZN ZN A 900 SG CYS B 331 1555 1555 2.35 LINK ZN ZN A 900 SG CYS B 326 1555 1555 2.30 LINK ZN ZN A 900 SG CYS A 331 1555 1555 2.32 LINK FE HEM B 750 O CMO B 920 1555 1555 2.83

CISPEP 1 THR A 701 PRO A 702 0 -0.50 CISPEP 2 THR B 701 PRO B 702 0 0.37

SITE 1 AC1 4 GLN A 420 TRP A 587 SER A 657 HOH A1059 SITE 1 AC2 4 GLN B 420 TRP B 587 VAL B 649 HOH B1041 SITE 1 AC3 4 CYS A 326 CYS A 331 CYS B 326 CYS B 331 SITE 1 AC4 20 TRP A 409 ALA A 412 ARG A 414 CYS A 415 SITE 2 AC4 20 PHE A 584 SER A 585 GLY A 586 TRP A 587 SITE 3 AC4 20 GLU A 592 TRP A 678 PHE A 704 TYR A 706 SITE 4 AC4 20 HBI A 760 ARG A 770 CMO A 920 HOH A 929 SITE 5 AC4 20 HOH A 933 HOH A 956 HOH A 967 HOH A1101 SITE 1 AC5 15 SER A 334 MET A 336 ARG A 596 VAL A 677 SITE 2 AC5 15 TRP A 678 HEM A 750 HOH A 921 HOH A 933 SITE 3 AC5 15 HOH A 949 HOH A 952 HOH A1100 TRP B 676 SITE 4 AC5 15 PHE B 691 HIS B 692 GLN B 693 SITE 1 AC6 12 GLN A 478 TYR A 562 PRO A 565 TRP A 587 SITE 2 AC6 12 TYR A 588 GLU A 592 ASP A 597 HEM A 750 SITE 3 AC6 12 CMO A 920 HOH A 928 HOH A 953 HOH A1103 SITE 1 AC7 3 PHE A 584 HEM A 750 ARG A 770 SITE 1 AC8 17 TRP B 409 ARG B 414 CYS B 415 PHE B 584 SITE 2 AC8 17 SER B 585 TRP B 587 GLU B 592 TRP B 678 SITE 3 AC8 17 PHE B 704 TYR B 706 HBI B 761 ARG B 771 SITE 4 AC8 17 CMO B 920 HOH B 922 HOH B 925 HOH B 961 SITE 5 AC8 17 HOH B 964 SITE 1 AC9 15 TRP A 676 PHE A 691 HIS A 692 GLU A 694 SITE 2 AC9 15 SER B 334 MET B 336 ARG B 596 VAL B 677 SITE 3 AC9 15 TRP B 678 HEM B 750 HOH B 921 HOH B 925 SITE 4 AC9 15 HOH B 946 HOH B 947 HOH B1118 SITE 1 BC1 11 GLN B 478 TYR B 562 PRO B 565 TRP B 587 SITE 2 BC1 11 TYR B 588 GLU B 592 ASP B 597 HEM B 750 SITE 3 BC1 11 CMO B 920 HOH B 933 HOH B1187 SITE 1 BC2 3 PHE B 584 HEM B 750 ARG B 771

CRYST1 51.970 111.530 164.370 90.00 90.00 90.00 P 21 21 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 0.019242 0.000000 0.000000 0.00000

SCALE2 0.000000 0.008966 0.000000 0.00000

SCALE3 0.000000 0.000000 0.006084 0.00000