3k8x
From Proteopedia
Crystal structure of the carboxyltransferase domain of acetyl-coenzyme A carboxylase in complex with tepraloxydim
Structural highlights
Function[ACAC_YEAST] Carries out three functions: biotin carboxyl carrier protein, biotin carboxylase and carboxyltransferase. Involved in the synthesis of very-long-chain fatty acid synthesis which is required to maintain a functional nuclear envelope. Required for acylation and vacuolar membrane association of VAC8 which is necessary to maintain a normal morphology of the vacuole.[1] [2] [3] [4] [5] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedAcetyl-CoA carboxylases (ACCs) are crucial metabolic enzymes and are attractive targets for drug discovery. Haloxyfop and tepraloxydim belong to two distinct classes of commercial herbicides and kill sensitive plants by inhibiting the carboxyltransferase (CT) activity of ACC. Our earlier structural studies showed that haloxyfop is bound near the active site of the CT domain, at the interface of its dimer, and a large conformational change in the dimer interface is required for haloxyfop binding. We report here the crystal structure at 2.3 A resolution of the CT domain of yeast ACC in complex with tepraloxydim. The compound has a different mechanism of inhibiting the CT activity compared to haloxyfop, as well as the mammalian ACC inhibitor CP-640186. Tepraloxydim probes a different region of the dimer interface and requires only small but important conformational changes in the enzyme, in contrast to haloxyfop. The binding mode of tepraloxydim explains the structure-activity relationship of these inhibitors, and provides a molecular basis for their distinct sensitivity to some of the resistance mutations, as compared to haloxyfop. Despite the chemical diversity between haloxyfop and tepraloxydim, the compounds do share two binding interactions to the enzyme, which may be important anchoring points for the development of ACC inhibitors. A different mechanism for the inhibition of the carboxyltransferase domain of acetyl-coenzyme A carboxylase by tepraloxydim.,Xiang S, Callaghan MM, Watson KG, Tong L Proc Natl Acad Sci U S A. 2009 Nov 19. PMID:19926852[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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Categories: Saccharomyces cerevisiae | Callaghan, M M | Tong, L | Watson, K G | Xiang, S | Acc | Acetyl-coa carboxylase | Atp-binding | Biotin | Carboxyltransferase | Ct | Fatty acid biosynthesis | Ligase | Lipid synthesis | Manganese | Metal-binding | Multifunctional enzyme | Nucleotide-binding | Phosphoprotein | Tepraloxydim | Transferase
