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1m9k

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{{STRUCTURE_1m9k| PDB=1m9k | SCENE= }}
{{STRUCTURE_1m9k| PDB=1m9k | SCENE= }}
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'''Human Endothelial Nitric Oxide Synthase with 7-Nitroindazole Bound'''
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===Human Endothelial Nitric Oxide Synthase with 7-Nitroindazole Bound===
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==Overview==
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Nitric oxide is a key signaling molecule in many biological processes, making regulation of nitric oxide levels highly desirable for human medicine and for advancing our understanding of basic physiology. Designing inhibitors to specifically target one of the three nitric oxide synthase (NOS) isozymes that form nitric oxide from the L-Arg substrate poses a significant challenge due to the overwhelmingly conserved active sites. We report here 10 new X-ray crystallographic structures of inducible and endothelial NOS oxygenase domains cocrystallized with chlorzoxazone and four nitroindazoles: 5-nitroindazole, 6-nitroindazole, 7-nitroindazole, and 3-bromo-7-nitroindazole. Each of these bicyclic aromatic inhibitors has only one hydrogen bond donor and therefore cannot form the bidentate hydrogen bonds that the L-Arg substrate makes with Glu371. Instead, all of these inhibitors induce a conformational change in Glu371, creating an active site with altered molecular recognition properties. The cost of this conformational change is approximately 1-2 kcal, based on our measured constants for inhibitor binding to the wild-type and E371A mutant proteins. These inhibitors derive affinity by pi-stacking above the heme and replacing both intramolecular (Glu371-Met368) and intermolecular (substrate-Trp366) hydrogen bonds to the beta-sheet architecture underlying the active site. When bound to NOS, high-affinity inhibitors in this class are planar, whereas weaker inhibitors are nonplanar. Isozyme differences were observed in the pterin cofactor site, the heme propionate, and inhibitor positions. Computational docking predictions match the crystallographic results, including the Glu371 conformational change and inhibitor-binding orientations, and support a combined crystallographic and computational approach to isozyme-specific NOS inhibitor analysis and design.
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==About this Structure==
==About this Structure==
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[[Category: Wallace, A V.]]
[[Category: Wallace, A V.]]
[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:47:42 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 23:29:51 2008''

Revision as of 20:29, 2 July 2008

Image:1m9k.png

Template:STRUCTURE 1m9k

Human Endothelial Nitric Oxide Synthase with 7-Nitroindazole Bound

Template:ABSTRACT PUBMED 12437348

About this Structure

1M9K is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Conformational changes in nitric oxide synthases induced by chlorzoxazone and nitroindazoles: crystallographic and computational analyses of inhibitor potency., Rosenfeld RJ, Garcin ED, Panda K, Andersson G, Aberg A, Wallace AV, Morris GM, Olson AJ, Stuehr DJ, Tainer JA, Getzoff ED, Biochemistry. 2002 Nov 26;41(47):13915-25. PMID:12437348

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