1gsn: Difference between revisions

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[[Image:1gsn.gif|left|200px]]
{{Seed}}
[[Image:1gsn.png|left|200px]]


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{{STRUCTURE_1gsn|  PDB=1gsn  |  SCENE=  }}  
{{STRUCTURE_1gsn|  PDB=1gsn  |  SCENE=  }}  


'''HUMAN GLUTATHIONE REDUCTASE MODIFIED BY DINITROSOGLUTATHIONE'''
===HUMAN GLUTATHIONE REDUCTASE MODIFIED BY DINITROSOGLUTATHIONE===




==Overview==
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Nitric oxide (NO) is a pluripotent regulatory molecule, yet the molecular mechanisms by which it exerts its effects are largely unknown. Few physiologic target molecules of NO have been identified, and even for these, the modifications caused by NO remain uncharacterized. Human glutathione reductase (hGR), a central enzyme of cellular antioxidant defense, is inhibited by S-nitrosoglutathione (GSNO) and by diglutathionyl-dinitroso-iron (DNIC-[GSH]2), two in vivo transport forms of NO. Here, crystal structures of hGR inactivated by GSNO and DNIC-[GSH]2 at 1.7 A resolution provide the first picture of enzyme inactivation by NO-carriers: in GSNO-modified hGR, the active site residue Cys 63 is oxidized to an unusually stable cysteine sulfenic acid (R-SOH), whereas modification with DNIC-[GSH]2 oxidizes Cys 63 to a cysteine sulfinic acid (R-SO2H). Our results illustrate that various forms of NO can mediate distinct chemistry, and that sulfhydryl oxidation must be considered as a major mechanism of NO action.
The line below this paragraph, {{ABSTRACT_PUBMED_9546215}}, adds the Publication Abstract to the page
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{{ABSTRACT_PUBMED_9546215}}


==About this Structure==
==About this Structure==
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[[Category: Sulfenic acid]]
[[Category: Sulfenic acid]]
[[Category: Sulfhydryl oxidation]]
[[Category: Sulfhydryl oxidation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 06:00:34 2008''

Revision as of 03:00, 1 July 2008

File:1gsn.png

Template:STRUCTURE 1gsn

HUMAN GLUTATHIONE REDUCTASE MODIFIED BY DINITROSOGLUTATHIONE

Template:ABSTRACT PUBMED 9546215

About this Structure

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

Reference

Enzyme inactivation through sulfhydryl oxidation by physiologic NO-carriers., Becker K, Savvides SN, Keese M, Schirmer RH, Karplus PA, Nat Struct Biol. 1998 Apr;5(4):267-71. PMID:9546215

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