6u9d

Saccharomyces cerevisiae acetohydroxyacid synthase

spinqualitylabelsall models 6u9d, resolution 3.19Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6u9d is a 24 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.194Å Ligands: 60G, ATP, FAD, MG, TPP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ILVB_YEAST Publication Abstract from PubMed Acetohydroxyacid synthase (AHAS), also known as acetolactate synthase, is a FAD and ThDP-Mg(2+)-dependent enzyme that catalyses the first step in the biosynthesis of the branched chain amino acids (BCAAs)(1). It is the target for over 50 commercial herbicides(2). AHAS requires both catalytic and regulatory subunits for maximal activity and functionality. Herein, our structures of the hexadecameric Saccharomyces cerevisiae and dodecameric Arabidopsis thaliana AHAS complexes demonstrate that the regulatory subunits form a core upon which the catalytic subunit dimers are attached, adopting the shape of a "Maltese Cross". The structures show how the catalytic and regulatory subunits communicate with each other to provide a pathway for activation and for feedback inhibition by the BCAAs. We also show that Mycobacterium tuberculosis AHAS adopts a similar structure, thus demonstrating that the overall AHAS architecture is conserved across kingdoms. Structures of fungal and plant acetohydroxyacid synthases.,Lonhienne T, Low YS, Garcia MD, Croll T, Gao Y, Wang Q, Brillault L, Williams CM, Fraser JA, McGeary RP, West NP, Landsberg MJ, Rao Z, Schenk G, Guddat LW Nature. 2020 Jul 8. pii: 10.1038/s41586-020-2514-3. doi:, 10.1038/s41586-020-2514-3. PMID:32640464 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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