1jsc | pdb_00001jsc
Crystal Structure of the Catalytic Subunit of Yeast Acetohydroxyacid Synthase: A target for Herbicidal Inhibitors
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| 1jsc, resolution 2.6Å | |||||||||||||
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| Ligands: | K, MG, 2HP, TPP and FAD | ||||||||||||
| Gene: | ILV2 (Saccharomyces cerevisiae) | ||||||||||||
| Activity: | Acetolactate synthase, with EC number 2.2.1.6 | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
Overview
Acetohydroxyacid synthase (AHAS; EC 4.1.3.18) catalyzes the first step in branched-chain amino acid biosynthesis. The enzyme requires thiamin diphosphate and FAD for activity, but the latter is unexpected, because the reaction involves no oxidation or reduction. Due to its presence in plants, AHAS is a target for sulfonylurea and imidazolinone herbicides. Here, the crystal structure to 2.6 A resolution of the catalytic subunit of yeast AHAS is reported. The active site is located at the dimer interface and is near the proposed herbicide-binding site. The conformation of FAD and its position in the active site are defined. The structure of AHAS provides a starting point for the rational design of new herbicides.
About this Structure
1JSC is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.
Reference
Crystal structure of yeast acetohydroxyacid synthase: a target for herbicidal inhibitors., Pang SS, Duggleby RG, Guddat LW, J Mol Biol. 2002 Mar 22;317(2):249-62. PMID:11902841
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