Biological Assembly 1  

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: 98.31 kDa 
• Atom Count: 6,620 
• Modelled Residue Count: 800 
• Deposited Residue Count: 854 
• Unique protein chains: 1

 3EAH

Structure of inhibited human eNOS oxygenase domain

• PDB DOI: 10.2210/pdb3EAH/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-08-25 Released: 2008-10-07 
• Deposition Author(s): Garcin, E.D., Arvai, A.S., Rosenfeld, R.J., Kroeger, M.D., Crane, B.R., Andersson, G., Andrews, G., Hamley, P.J., Mallinder, P.R., Nicholls, D.J., St-Gallay, S.A., Tinker, A.C., Gensmantel, N.P., Mete, A., Cheshire, D.R., Connolly, S., Stuehr, D.J., Aberg, A., Wallace, A.V., Tainer, J.A., Getzoff, E.D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.44 Å
• R-Value Free: 0.258 
• R-Value Work: 0.213 

Literature

Anchored plasticity opens doors for selective inhibitor design in nitric oxide synthase.

Garcin, E.D., Arvai, A.S., Rosenfeld, R.J., Kroeger, M.D., Crane, B.R., Andersson, G., Andrews, G., Hamley, P.J., Mallinder, P.R., Nicholls, D.J., St-Gallay, S.A., Tinker, A.C., Gensmantel, N.P., Mete, A., Cheshire, D.R., Connolly, S., Stuehr, D.J., Aberg, A., Wallace, A.V., Tainer, J.A., Getzoff, E.D.

(2008) Nat Chem Biol 4: 700-707

• PubMed: 18849972 
• DOI: 10.1038/nchembio.115
• Primary Citation of Related Structures:  
  3E65, 3E67, 3E68, 3E6L, 3E6N, 3E6O, 3E6T, 3E7G, 3E7I, 3E7M, 3E7S, 3E7T, 3EAH, 3EAI, 3EBD, 3EBF, 3EJ8


• PubMed Abstract: 
  

Nitric oxide synthase (NOS) enzymes synthesize nitric oxide, a signal for vasodilatation and neurotransmission at low concentrations and a defensive cytotoxin at higher concentrations. The high active site conservation among all three NOS isozymes hinders the design of selective NOS inhibitors to treat inflammation, arthritis, stroke, septic shock and cancer. Our crystal structures and mutagenesis results identified an isozyme-specific induced-fit binding mode linking a cascade of conformational changes to a new specificity pocket. Plasticity of an isozyme-specific triad of distant second- and third-shell residues modulates conformational changes of invariant first-shell residues to determine inhibitor selectivity. To design potent and selective NOS inhibitors, we developed the anchored plasticity approach: anchor an inhibitor core in a conserved binding pocket, then extend rigid bulky substituents toward remote specificity pockets, which become accessible upon conformational changes of flexible residues. This approach exemplifies general principles for the design of selective enzyme inhibitors that overcome strong active site conservation.

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Organizational Affiliation: 

The Scripps Research Institute, Department of Molecular Biology and Skaggs Institute for Chemical Biology, 10550 North Torrey Pines Road, MB4, La Jolla, California 92037, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Nitric oxide synthase, endothelial	A, B	427	Homo sapiens	Mutation(s): 0  Gene Names: NOS3 EC: 1.14.13.39
UniProt & NIH Common Fund Data Resources
Find proteins for P29474 (Homo sapiens) Explore P29474  Go to UniProtKB:  P29474
PHAROS:  P29474

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEC	C [auth A], L [auth B]	HEME C C34 H34 Fe N4 O4 HXQIYSLZKNYNMH-LJNAALQVSA-N
327	E [auth A], M [auth B]	(3S,5E)-3-propyl-3,4-dihydrothieno[2,3-f][1,4]oxazepin-5(2H)-imine C10 H14 N2 O S JIIBOYBTIWHZFJ-ZETCQYMHSA-N
MPD	F [auth A], H [auth A], I [auth A], K [auth B]	(4S)-2-METHYL-2,4-PENTANEDIOL C6 H14 O2 SVTBMSDMJJWYQN-YFKPBYRVSA-N
ZN	D [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
CL	G [auth A], J [auth B]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Binding Affinity Annotations
ID	Source	Binding Affinity
327	Binding MOAD:  3EAH	IC50: 40 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.44 Å
• R-Value Free: 0.258 
• R-Value Work: 0.213 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 71.09	α = 90
b = 90.15	β = 90
c = 156.1	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
PDB_EXTRACT	data extraction
DENZO	data reduction
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2008-10-07 
Deposition Author(s): Garcin, E.D., Arvai, A.S., Rosenfeld, R.J., Kroeger, M.D., Crane, B.R., Andersson, G., Andrews, G., Hamley, P.J., Mallinder, P.R., Nicholls, D.J., St-Gallay, S.A., Tinker, A.C., Gensmantel, N.P., Mete, A., Cheshire, D.R., Connolly, S., Stuehr, D.J., Aberg, A., Wallace, A.V., Tainer, J.A., Getzoff, E.D.

Revision History  

• Version 1.0: 2008-10-07
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance