4c87

Publication Abstract from PubMed

The genome of the lactic acid bacterium Lactobacillus plantarum WCFS1 reveals the presence of a rich repertoire of esterases and lipases highlighting their important role in cellular metabolism. Among them is the carboxylesterase LpEst1 a bacterial enzyme related to the mammalian hormone-sensitive lipase, which is known to play a central role in energy homeostasis. In this study, the crystal structure of LpEst1 has been determined at 2.05 A resolution; it exhibits an alphabeta-hydrolase fold, consisting of a central beta-sheet surrounded by alpha-helices, endowed with novel topological features. The structure reveals a dimeric assembly not comparable with any other enzyme from the bacterial hormone-sensitive lipase family, probably echoing the specific structural features of the participating subunits. Biophysical studies including analytical gel filtration and ultracentrifugation support the dimeric nature of LpEst1. Structural and mutational analyses of the substrate-binding pocket and active site together with biochemical studies provided insights for understanding the substrate profile of LpEst1 and suggested for the first time the conserved Asp173, which is adjacent to the nucleophile, as a key element in the stabilization of the loop where the oxyanion hole resides.

Esterase LpEst1 from Lactobacillus plantarum: A Novel and Atypical Member of the alphabeta Hydrolase Superfamily of Enzymes.,Alvarez Y, Esteban-Torres M, Cortes-Cabrera A, Gago F, Acebron I, Benavente R, Mardo K, de Las Rivas B, Munoz R, Mancheno JM PLoS One. 2014 Mar 24;9(3):e92257. doi: 10.1371/journal.pone.0092257. eCollection, 2014. PMID:24663330^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.