期刊
BIOCHEMICAL ENGINEERING JOURNAL
卷 77, 期 -, 页码 154-160出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bej.2013.05.012
关键词
Pseudomonas aeruginosa elastase; Pseudolysin; Organic solvent-stability; Peptide synthesis; Pichia pastoris; Gene expression
资金
- Key Laboratory of Carbohydrate Chemistry & Biotechnology Ministry of Education [KLCCB-KF201308]
The lasB gene encoding a solvent-stable elastase from Pseudomonas aeruginosa (PAE) was isolated and heterologously expressed in Pichia pastoris, resulting in production of three heterogeneously glycosylated recombinant elastases (rPAEs). rPAEs showed higher solvent-stability and thermostability than native PAE, but these recombinant and native enzymes achieved similar values of specific activity (2393 U/mg and 2427 U/mg for rPAEs and the native one, respectively), apparent K-m (2.55 and 2.48 g/l for rPAEs and the native one, respectively) and k(cat) (0.0489 and 0.0496/s for rPAEs and the native one, respectively) for casein hydrolysis. While rPAEs and their native counterpart displayed similar substrate specificity in bipeptide synthesis reactions in water-miscible organic solvents, the former gave higher synthesis rates and yields than the latter. The yields and rates of rPAEs-catalyzed bipeptide synthesis reactions substantially varied with the type of solvent, and dimethylsulfoxide (DMSO) was found to be more suitable for these reactions than methanol, ethanol, isopropanol, and n-butanol. The optimal reaction conditions for rPAEs-catalyzed Cbz-Ala-Phe-NH2 synthesis were the presence of 50% (v/v) DMSO, and at pH 8.0 and temperature 20-30 degrees C. (C) 2013 Elsevier B.V. All rights reserved.
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