Crystal Structures of Malonyl-Coenzyme A Decarboxylase Provide Insights into Its Catalytic Mechanism and Disease-Causing Mutations

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• 作者：D.?Sean Froese ; Farhad Forouhar ; Timothy?H. Tran ; Melanie Vollmar ; Yi?Seul Kim ; Scott Lew ; Helen Neely ; Jayaraman Seetharaman ; Yang Shen ; Rong Xiao ; Thomas?B. Acton ; John?K. Everett ; Giuseppe Cannone ; Sriharsha Puranik ; Pavel Savitsky ; Tobias Krojer ; Ewa?S. Pilka ; Wasim Kiyani ; Wen?Hwa Lee ; Brian?D. Marsden ; et al.
• 刊名：Structure
• 出版年：2013
• 出版时间：2 July, 2013
• 年：2013
• 卷：21
• 期：7
• 页码：1182-1192
• 全文大小：3557 K

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Summary

Malonyl-coenzyme A decarboxylase (MCD) is found from bacteria to humans, has important roles in regulating fatty acid metabolism and food intake, and is an attractive target for drug discovery. We report here four crystal structures of MCD from human, Rhodopseudomonas palustris, Agrobacterium vitis, and Cupriavidus metallidurans at up to 2.3?? resolution. The MCD monomer contains an N-terminal helical domain involved in oligomerization and a C-terminal catalytic domain. The four structures exhibit substantial differences in the organization of the helical domains and, consequently, the oligomeric states and intersubunit interfaces. Unexpectedly, the MCD catalytic domain is structurally homologous to those of the GCN5-related N-acetyltransferase superfamily, especially the curacin A polyketide synthase catalytic module, with a conserved His-Ser/Thr dyad important for catalysis. Our structures, along with mutagenesis and kinetic studies, provide a molecular basis for understanding pathogenic mutations and catalysis, as well as a template for structure-based drug design.