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1tll

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[[Image:1tll.gif|left|200px]]
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{{STRUCTURE_1tll| PDB=1tll | SCENE= }}
{{STRUCTURE_1tll| PDB=1tll | SCENE= }}
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'''CRYSTAL STRUCTURE OF RAT NEURONAL NITRIC-OXIDE SYNTHASE REDUCTASE MODULE AT 2.3 A RESOLUTION.'''
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===CRYSTAL STRUCTURE OF RAT NEURONAL NITRIC-OXIDE SYNTHASE REDUCTASE MODULE AT 2.3 A RESOLUTION.===
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==Overview==
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Three nitric-oxide synthase (NOS) isozymes play crucial, but distinct, roles in neurotransmission, vascular homeostasis, and host defense, by catalyzing Ca(2+)/calmodulin-triggered NO synthesis. Here, we address current questions regarding NOS activity and regulation by combining mutagenesis and biochemistry with crystal structure determination of a fully assembled, electron-supplying, neuronal NOS reductase dimer. By integrating these results, we structurally elucidate the unique mechanisms for isozyme-specific regulation of electron transfer in NOS. Our discovery of the autoinhibitory helix, its placement between domains, and striking similarities with canonical calmodulin-binding motifs, support new mechanisms for NOS inhibition. NADPH, isozyme-specific residue Arg(1400), and the C-terminal tail synergistically repress NOS activity by locking the FMN binding domain in an electron-accepting position. Our analyses suggest that calmodulin binding or C-terminal tail phosphorylation frees a large scale swinging motion of the entire FMN domain to deliver electrons to the catalytic module in the holoenzyme.
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(as it appears on PubMed at http://www.pubmed.gov), where 15208315 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15208315}}
==About this Structure==
==About this Structure==
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[[Category: Nitric-oxide synthase]]
[[Category: Nitric-oxide synthase]]
[[Category: Reductase module]]
[[Category: Reductase module]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:06:04 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 09:39:47 2008''

Revision as of 06:39, 29 July 2008

Image:1tll.png

Template:STRUCTURE 1tll

CRYSTAL STRUCTURE OF RAT NEURONAL NITRIC-OXIDE SYNTHASE REDUCTASE MODULE AT 2.3 A RESOLUTION.

Template:ABSTRACT PUBMED 15208315

About this Structure

1TLL is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Structural basis for isozyme-specific regulation of electron transfer in nitric-oxide synthase., Garcin ED, Bruns CM, Lloyd SJ, Hosfield DJ, Tiso M, Gachhui R, Stuehr DJ, Tainer JA, Getzoff ED, J Biol Chem. 2004 Sep 3;279(36):37918-27. Epub 2004 Jun 17. PMID:15208315

Page seeded by OCA on Tue Jul 29 09:39:47 2008

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