Mechanism and inhibition of the FabV enoyl-ACP reductase from Burkholderia mallei.

Hao Lu, Peter J Tonge


Enoyl-ACP reductases catalyze the final step in the elongation cycle of the bacterial fatty acid biosynthesis (FAS-II) pathway. At present, four distinct enoyl-ACP reductases have been identified, which are the products of the fabI, fabL, fabK, and fabV genes. The FabV enoyl-ACP reductase is the most recent member of this enzyme class and was originally identified in Vibrio cholerae by Cronan and co-workers [Massengo-Tiasse, R. P., and Cronan, J. E. (2008) Vibrio cholerae FabV defines a new class of enoyl-acyl carrier protein reductase. J. Biol. Chem. 283, 1308-1316]. In this work, a detailed kinetic analysis of the mechanism of the FabV enzyme from Burkholderia mallei (bmFabV) has been undertaken, which reveals that bmFabV catalyzes a sequential bi-bi mechanism with NADH binding first and NAD(+) dissociating last. The enzyme is a member of the short chain dehydrogenase/reductase superfamily in which the catalytic tyrosine (Y235) and lysine (K244) residues are organized in the consensus Tyr-(Xaa)(8)-Lys motif. The role of these active site residues has been investigated using site-directed mutagenesis which has shown that both Y235 and K244 are involved in acid-base chemistry during substrate reduction. Sequence alignment and s...Continue Reading


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