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1t9a

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{{STRUCTURE_1t9a| PDB=1t9a | SCENE= }}
{{STRUCTURE_1t9a| PDB=1t9a | SCENE= }}
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'''Crystal structure of yeast acetohydroxyacid synthase in complex with a sulfonylurea herbicide, tribenuron methyl'''
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===Crystal structure of yeast acetohydroxyacid synthase in complex with a sulfonylurea herbicide, tribenuron methyl===
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==Overview==
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Acetohydroxyacid synthase (AHAS, EC 2.2.1.6) is the target for the sulfonylurea herbicides, which act as potent inhibitors of the enzyme. Chlorsulfuron (marketed as Glean) and sulfometuron methyl (marketed as Oust) are two commercially important members of this family of herbicides. Here we report crystal structures of yeast AHAS in complex with chlorsulfuron (at a resolution of 2.19 A), sulfometuron methyl (2.34 A), and two other sulfonylureas, metsulfuron methyl (2.29 A) and tribenuron methyl (2.58 A). The structures observed suggest why these inhibitors have different potencies and provide clues about the differential effects of mutations in the active site tunnel on various inhibitors. In all of the structures, the thiamin diphosphate cofactor is fragmented, possibly as the result of inhibitor binding. In addition to thiamin diphosphate, AHAS requires FAD for activity. Recently, it has been reported that reduction of FAD can occur as a minor side reaction due to reaction with the carbanion/enamine of the hydroxyethyl-ThDP intermediate that is formed midway through the catalytic cycle. Here we report that the isoalloxazine ring has a bent conformation that would account for its ability to accept electrons from the hydroxyethyl intermediate. Most sequence and mutation data suggest that yeast AHAS is a high-quality model for the plant enzyme.
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(as it appears on PubMed at http://www.pubmed.gov), where 15709745 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15709745}}
==About this Structure==
==About this Structure==
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[[Category: Thiamin diphosphate]]
[[Category: Thiamin diphosphate]]
[[Category: Tribenuron methyl]]
[[Category: Tribenuron methyl]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 09:41:49 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 18:54:58 2008''

Revision as of 15:55, 27 July 2008

Image:1t9a.png

Template:STRUCTURE 1t9a

Crystal structure of yeast acetohydroxyacid synthase in complex with a sulfonylurea herbicide, tribenuron methyl

Template:ABSTRACT PUBMED 15709745

About this Structure

1T9A is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

Reference

Elucidating the specificity of binding of sulfonylurea herbicides to acetohydroxyacid synthase., McCourt JA, Pang SS, Guddat LW, Duggleby RG, Biochemistry. 2005 Feb 22;44(7):2330-8. PMID:15709745

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