3E7G

Structure of human INOSOX with inhibitor AR-C95791


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.182 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


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

  • DOI: 10.1038/nchembio.115
  • Primary Citation of Related Structures:  
    3E65, 3E67, 3E68, 3E6T, 3E6L, 3E6N, 3E6O, 3E7M, 3E7S, 3E7T

  • 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 ...

    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.


    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. egarcin@umbc.edu



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Nitric oxide synthase, inducibleABCD424Homo sapiensMutation(s): 0 
Gene Names: NOS2NOS2A
EC: 1.14.13.39
Find proteins for P35228 (Homo sapiens)
Explore P35228 
Go to UniProtKB:  P35228
NIH Common Fund Data Resources
PHAROS  P35228
Protein Feature View
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  • Reference Sequence
Small Molecules
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
AT2IC50:  350   nM  Binding MOAD
AT2IC50:  350   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.206α = 90
b = 158.671β = 90
c = 191.141γ = 90
Software Package:
Software NamePurpose
CNSrefinement
PDB_EXTRACTdata extraction
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Revision History 

  • Version 1.0: 2008-10-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description