4IMT image
Entry Detail
PDB ID:
4IMT
Keywords:
Oxidoreductase/Oxidoreductase inhibitor
Title:
Structure of rat neuronal nitric oxide synthase in complex with 6,6'-((4-(3-aminopropyl)-1,3-phenylene)bis(ethane-2,1-diyl))bis(4-methylpyridin-2-amine)
Biological Source:
Source Organism:
Rattus norvegicus
Host Organism:
Escherichia coli
PDB Version:
Deposition Date:
2013-01-03
Release Date:
2013-04-24
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.20 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
P 21 21 21
4IMT validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Nitric oxide synthase, brain
Chain IDs:A, B
Chain Length:422
Number of Molecules:2
Biological Source:Rattus norvegicus
UniProt ID:P29476 Pfam ID:PF02898 EC:1.14.13.39
Ligand Molecules
1EW
ACT
H4B
HEM
ZN
Primary Citation
Structure-guided design of selective inhibitors of neuronal nitric oxide synthase.
J.Med.Chem. 56 3024 3032 (2013)
PMID: 23451760 DOI: 10.1021/jm4000984

Abstact

Nitric oxide synthases (NOSs) comprise three closely related isoforms that catalyze the oxidation of L-arginine to L-citrulline and the important second messenger nitric oxide (NO). Pharmacological selective inhibition of neuronal NOS (nNOS) has the potential to be therapeutically beneficial in various neurodegenerative diseases. Here, we present a structure-guided, selective nNOS inhibitor design based on the crystal structure of lead compound 1 in nNOS. The best inhibitor, 7, exhibited low nanomolar inhibitory potency and good isoform selectivities (nNOS over eNOS and iNOS are 472-fold and 239-fold, respectively). Consistent with the good selectivity, 7 binds to nNOS and eNOS with different binding modes. The distinctly different binding modes of 7, driven by the critical residue Asp597 in nNOS, offers compelling insight to explain its isozyme selectivity, which should guide future drug design programs.

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Primary Citation of related structures
4IMT