Purification and characterization of L-aminoacylase from Pseudomonas maltophila B1

Mamoru Wakayama, Eiichi Shiiba, Kenji Sakai, Mitsuaki Moriguchi

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Abstract

The constitutive L-aminoacylase, which is used for optical resolution of DL-α-aminosuberic acid (DL-Asu), has been purified and characterized from Pseudomonas maltophila B1. The crude enzyme showed a specific activity of 0.062 units/mg for N-acetyl(Ac)-L-Asu. This value is very high compared with those from Aspergillus melleus, porcine kidney, and Bacillus stearothermophilus. Molecular masses of 108 kDa for the native enzyme and 50 kDa for the subunit were determined, indicating a dimer. The enzyme activity was optimal at pH 8.0 and at 55°C. The enzyme hydrolyzed N-acyl derivatives of various neutral L-amino acids and acidic L-amino acids, L-glutamate and L-Asu. The enzyme also had dipeptidase activity. The Km values for N-Ac-L-alanine and N-Ac-DL-Asu were determined at 2.32 and 12.7 mM, respectively. The apoenzyme was activated using Zn2+, Ca2+, and Co2+. Glyoxylate, DL-lactate, phenylboronic acid (PBA), butaneboronic acid (BBA), diethylpyrocarbonate (DEP), and phenylglyoxal (PGO) inhibited enzyme activity.

Original languageEnglish
Pages (from-to)278-282
Number of pages5
JournalJournal of Fermentation and Bioengineering
Volume85
Issue number3
DOIs
Publication statusPublished - Jan 1 1998
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Applied Microbiology and Biotechnology

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