1DM6

BOVINE ENDOTHELIAL NITRIC OXIDE SYNTHASE HEME DOMAIN COMPLEXED WITH N-(4-CHLOROPHENYL)-N'-HYDROXYGUANIDINE (H4B FREE)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 

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This is version 1.2 of the entry. See complete history. 


Literature

Crystal structure of nitric oxide synthase bound to nitro indazole reveals a novel inactivation mechanism.

Raman, C.S., Li, H., Martasek, P., Southan, G., Masters, B.S., Poulos, T.L.

(2001) Biochemistry 40: 13448-13455

  • DOI: 10.1021/bi010957u
  • Primary Citation of Related Structures:  
    1D0C, 1D0O, 1DM6, 1ED5, 1FOJ, 8NSE

  • PubMed Abstract: 

    • Nitric oxide is generated under normal and pathophysiological conditions by three distinct isoforms of nitric oxide synthase (NOS). A small-molecule inhibitor of NOS (3-Br-7-nitroindazole, 7-NIBr) is profoundly neuroprotective in mouse models of stroke and Parkinson's disease ...

    Nitric oxide is generated under normal and pathophysiological conditions by three distinct isoforms of nitric oxide synthase (NOS). A small-molecule inhibitor of NOS (3-Br-7-nitroindazole, 7-NIBr) is profoundly neuroprotective in mouse models of stroke and Parkinson's disease. We report the crystal structure of the catalytic heme domain of endothelial NOS complexed with 7-NIBr at 1.65 A resolution. Critical to the binding of 7-NIBr at the substrate site is the adoption by eNOS of an altered conformation, in which a key glutamate residue swings out toward one of the heme propionate groups. Perturbation of the heme propionate ensues and eliminates the cofactor tetrahydrobiopterin-heme interaction. We also present three crystal structures that reveal how alterations at the substrate site facilitate 7-NIBr and structurally dissimilar ligands to occupy the cofactor site.

    Related Citations: 
    • Crystal Structure of Constitutive Endothelial Nitric Oxide Synthase: A Paradigm for Pterin Function Involving a Novel Metal Center
      Raman, C.S., Li, H., Martasek, P., Kral, V., Masters, B.S.S., Poulos, T.L.
      (1998) Cell 95: 939
    • Structure of Nitric Oxide Synthase Oxygenase Dimer with Pterin and Substrate
      Crane, B.R., Arvai, A.S., Ghosh, D.K., Wu, C., Getzoff, E.D., Stuehr, D.J., Tainer, A.
      (1998) Science 279: 2121
    • Efficient Formation of Nitric Oxide from Selective Oxidation of N-Aryl N'- Hydroxyguanidines by Inducible Nitric Oxide Synthase
      Renodon-Corniere, A., Boucher, J.-L., Dijols, S., Stuehr, D.J., Mansuy, D.
      (1999) Biochemistry 38: 4663
    Organizational Affiliation: 

    Department of Molecular Biology & Biochemistry, University of California, Irvine, California 92697, USA. c.s.raman@uth.tmc.edu



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NITRIC OXIDE SYNTHASEA, B444Bos taurusMutation(s): 0 
Gene Names: NOS3
EC: 1.14.13.39
UniProt
Find proteins for P29473 (Bos taurus)
Explore P29473 
Go to UniProtKB:  P29473
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29473
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM
Download Ideal Coordinates CCD File 
G [auth A],
N [auth B]		PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L		 Ligand Interaction
PH3
Query on PH3
Download Ideal Coordinates CCD File 
H [auth A],
I [auth A],
M [auth B],
O [auth B]		N-(CHLOROPHENYL)-N'-HYDROXYGUANIDINE
C7 H8 Cl N3 O
JYBXKTLYOMPMQY-UHFFFAOYSA-N		 Ligand Interaction
CAC
Query on CAC
Download Ideal Coordinates CCD File 
E [auth A],
L [auth B]		CACODYLATE ION
C2 H6 As O2
OGGXGZAMXPVRFZ-UHFFFAOYSA-M		 Ligand Interaction
ZN
Query on ZN
Download Ideal Coordinates CCD File 
F [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
ACT
Query on ACT
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
J [auth B],
K [auth B]		ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.88α = 90
b = 106.43β = 90
c = 155.92γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-12-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance