1f1h

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{{STRUCTURE_1f1h| PDB=1f1h | SCENE= }}
{{STRUCTURE_1f1h| PDB=1f1h | SCENE= }}
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'''CRYSTAL STRUCTURE OF GLUTAMINE SYNTHETASE FROM SALMONELLA TYPHIMURIUM WITH THALLIUM IONS'''
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===CRYSTAL STRUCTURE OF GLUTAMINE SYNTHETASE FROM SALMONELLA TYPHIMURIUM WITH THALLIUM IONS===
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==Overview==
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Phosphinothricin is a potent inhibitor of the enzyme glutamine synthetase (GS). The resolution of the native structure of GS from Salmonella typhimurium has been extended to 2.5 A resolution, and the improved model is used to determine the structure of phosphinothricin complexed to GS by difference Fourier methods. The structure suggests a noncovalent, dead-end mechanism of inhibition. Phosphinothricin occupies the glutamate substrate pocket and stabilizes the Glu327 flap in a position which blocks the glutamate entrance to the active site, trapping the inhibitor on the enzyme. One oxygen of the phosphinyl group of phosphinothricin appears to be protonated, because of its proximity to the carboxylate group of Glu327. The other phosphinyl oxygen protrudes into the negatively charged binding pocket for the substrate ammonium, disrupting that pocket. The distribution of charges in the glutamate binding pocket is complementary to those of phosphinothricin. The presence of a second ammonium binding site within the active site is confirmed by its analogue thallous ion, marking the ammonium site and its protein ligands. The inhibition of GS by methionine sulfoximine can be explained by the same mechanism. These models of inhibited GS further illuminate its catalytic mechanism.
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(as it appears on PubMed at http://www.pubmed.gov), where 11329256 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11329256}}
==About this Structure==
==About this Structure==
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[[Category: Glutamine synthetase]]
[[Category: Glutamine synthetase]]
[[Category: Thallium ion]]
[[Category: Thallium ion]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:46:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 02:20:34 2008''

Revision as of 23:20, 30 June 2008

Image:1f1h.png

Template:STRUCTURE 1f1h

CRYSTAL STRUCTURE OF GLUTAMINE SYNTHETASE FROM SALMONELLA TYPHIMURIUM WITH THALLIUM IONS

Template:ABSTRACT PUBMED 11329256

About this Structure

1F1H is a Single protein structure of sequence from Salmonella typhimurium. Full crystallographic information is available from OCA.

Reference

The crystal structure of phosphinothricin in the active site of glutamine synthetase illuminates the mechanism of enzymatic inhibition., Gill HS, Eisenberg D, Biochemistry. 2001 Feb 20;40(7):1903-12. PMID:11329256

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