Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 102383.07 
• Atom Count: 6766 
• Residue Count: 888 
• Unique protein chains: 1

1D0O

BOVINE ENDOTHELIAL NITRIC OXIDE SYNTHASE HEME DOMAIN COMPLEXED WITH 3-BROMO-7-NITROINDAZOLE (H4B PRESENT)

• DOI: 10.2210/pdb1D0O/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Bos taurus
• Expression System: Escherichia coli


• Deposited: 1999-09-13 Released: 2001-11-21 
• Deposition Author(s): Raman, C.S., Li, H., Martasek, P., Southan, G.J., Masters, B.S.S., Poulos, T.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.247 
• R-Value Work: 0.200 

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

• PubMed: 11695891 
• Primary Citation of Related Structures:  
  8NSE, 1FOJ, 1ED5, 1DM6, 1D0C


• 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. 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.

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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.,Poulos, T.L.
  (1998) Cell 95: 939
• The Structure of Nitric Oxide Synthase Oxygenase Domain and Inhibitor Complexes
  Crane, B.R.,Arvai, A.S.,Gachhui, R.,Wu, C.,Ghosh, D.K.,Getzoff, E.D.,Stuehr, D.J.,Tainer, J.A.
  (1997) Science 278: 425
• 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, J.A.
  (1998) Science 279: 2121




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Organizational Affiliation: 

Department of Molecular Biology & Biochemistry, University of California, Irvine, California 92697, USA. [e-mail]

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
BOVINE ENDOTHELIAL NITRIC OXIDE SYNTHASE HEME	A, B	444	Bos taurus	Mutation(s): 0  Gene Names: NOS3 EC: 1.14.13.39
Find proteins for P29473 (Bos taurus) Go to Gene View: NOS3 Go to UniProtKB:  P29473

Small Molecules

Ligands 6 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
INE	A, B	3-BROMO-7-NITROINDAZOLE C7 H4 Br N3 O2 NFSTZPMYAZRZPC-UHFFFAOYSA-N
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
ACT	A, B	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M
CAD	A, B	CACODYLIC ACID HYDROXYDIMETHYLARSINE OXIDE C2 H7 As O2 OGGXGZAMXPVRFZ-UHFFFAOYSA-N
GOL	A, B	GLYCEROL GLYCERIN; PROPANE-1,2,3-TRIOL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
HEM	A, B	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
INE	IC50: 2000 nM (99) BINDINGDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.247 
• R-Value Work: 0.200 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 57.590	α = 90.00
b = 106.060	β = 90.00
c = 155.780	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
DENZO	data reduction
X-PLOR	refinement
X-PLOR	model building
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-09-13 
• Released Date: 2001-11-21 
• Deposition Author(s): Raman, C.S., Li, H., Martasek, P., Southan, G.J., Masters, B.S.S., Poulos, T.L.

Revision History 

• Version 1.0: 2001-11-21
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Non-polymer description, Version format compliance