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3nse

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[[Image:3nse.jpg|left|200px]]
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{{Seed}}
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{{STRUCTURE_3nse| PDB=3nse | SCENE= }}
{{STRUCTURE_3nse| PDB=3nse | SCENE= }}
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'''BOVINE ENOS, H4B-FREE, SEITU COMPLEX'''
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===BOVINE ENOS, H4B-FREE, SEITU COMPLEX===
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==Overview==
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Nitric oxide, a key signaling molecule, is produced by a family of enzymes collectively called nitric oxide synthases (NOS). Here, we report the crystal structure of the heme domain of endothelial NOS in tetrahydrobiopterin (H4B)-free and -bound forms at 1.95 A and 1.9 A resolution, respectively. In both structures a zinc ion is tetrahedrally coordinated to pairs of symmetry-related cysteine residues at the dimer interface. The phylogenetically conserved Cys-(X)4-Cys motif and its strategic location establish a structural role for the metal center in maintaining the integrity of the H4B-binding site. The unexpected recognition of the substrate, L-arginine, at the H4B site indicates that this site is poised to stabilize a positively charged pterin ring and suggests a model involving a cationic pterin radical in the catalytic cycle.
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(as it appears on PubMed at http://www.pubmed.gov), where 9875848 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9875848}}
==About this Structure==
==About this Structure==
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[[Category: Nitric oxide synthase]]
[[Category: Nitric oxide synthase]]
[[Category: Tetrahydrobiopterin]]
[[Category: Tetrahydrobiopterin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:08:17 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 12:58:05 2008''

Revision as of 09:58, 3 July 2008

Image:3nse.png

Template:STRUCTURE 3nse

BOVINE ENOS, H4B-FREE, SEITU COMPLEX

Template:ABSTRACT PUBMED 9875848

About this Structure

3NSE is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.

Reference

Crystal structure of constitutive endothelial nitric oxide synthase: a paradigm for pterin function involving a novel metal center., Raman CS, Li H, Martasek P, Kral V, Masters BS, Poulos TL, Cell. 1998 Dec 23;95(7):939-50. PMID:9875848

Page seeded by OCA on Thu Jul 3 12:58:05 2008

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