A novel enantioselective SGNH family esterase (NmSGNH1) from Neisseria meningitides: Characterization, mutational analysis, and ester synthesis

Publication date: Available online 17 July 2019Source: Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of LipidsAuthor(s): W.i Yoo, Ly Thi Huong Luu Le, Jun Hyuck Lee, Kyeong Kyu Kim, T. Doohun KimAbstractIn Neisseria sp., SGNH family esterases are involved in bacterial pathogenesis as well as cell wall peptidoglycan maturation. Here, a novel enantioselective SGNH family esterase (NmSGNH1) from Neisseria meningitidis, which has sequence similarity to carbohydrate esterase (CE3) family, was catalytically characterized and functionally explored. NmSGNH1 exhibited a wide range of substrate specificities including naproxol acetate, tert-butyl acetate, glucose pentaacetate as well as p-nitrophenyl esters. Deletion of C-terminal residues (NmSGNH1Δ11) led to the altered substrate specificity, reduced catalytic activity, and increased thermostability. Furthermore, a hydrophobic residue of Leu92 in the substrate-binding pocket was identified to be critical in catalytic activity, thermostability, kinetics, and enantioselectivity. Interestingly, immobilization of NmSGNH1 by hybrid nanoflowers (hNFs) and crosslinked enzyme aggregates (CLEAs) showed increased level of activity, recycling property, and enhanced stability. Finally, synthesis of butyl acetate, oleic acid esters, and fatty acid methyl esters (FAMEs) were verified. In summary, this work provides a molecular understanding of substrate specificities, catalytic regulation, immobilization, and industrial applicat...
Source: Biochimica et Biophysica Acta (BBA) Molecular and Cell Biology of Lipids - Category: Lipidology Source Type: research