Purification and characterization of enantioselective N-acetyl-β-Phe acylases from Burkholderia sp. AJ110349

• Published in: Bioscience, biotechnology, and biochemistry Vol. 80; no. 1; pp. 104 - 113
• Main Authors: Imabayashi, Yuki, Suzuki, Shun'ichi, Kawasaki, Hisashi, Nakamatsu, Tsuyoshi
• Format: Journal Article
• Language: English
• Published: England Taylor & Francis 02-01-2016
• Subjects: Amidohydrolases - genetics; Amidohydrolases - isolation & purification; Amidohydrolases - metabolism; Amino Acids - chemistry; Amino Acids - metabolism; Bacterial Proteins - genetics; Bacterial Proteins - isolation & purification; Bacterial Proteins - metabolism; Biocatalysis; Burkholderia; Burkholderia - enzymology; Burkholderia - genetics; Cloning, Molecular; enantiomer selective amidohydrolyzing activity; Enzyme Assays; Escherichia coli - genetics; Escherichia coli - metabolism; Gene Expression; Hydrolysis; Kinetics; N-acetyl-β-amino acid; Recombinant Proteins - genetics; Recombinant Proteins - isolation & purification; Recombinant Proteins - metabolism; Stereoisomerism; Substrate Specificity; β-amino acid; β-amino acid; N-acetyl-β-amino acid; Burkholderia; enantiomer selective amidohydrolyzing activity
• ISSN: 0916-8451; 1347-6947
• DOI: 10.1080/09168451.2015.1072458

For the production of enantiopure β-amino acids, enantioselective resolution of N-acyl β-amino acids using acylases, especially those recognizing N-acetyl-β-amino acids, is one of the most attractive methods. Burkholderia sp. AJ110349 had been reported to exhibit either (R)- or (S)-enantiomer selective N-acetyl-β-Phe amidohydrolyzing activity, and in this study, both (R)- and (S)-enantioselective N-acetyl-β-Phe acylases were purified to be electrophoretically pure and determined the sequences, respectively. They were quite different in terms of enantioselectivities and in their amino acids sequences and molecular weights. Although both the purified acylases were confirmed to catalyze N-acetyl hydrolyzing activities, neither of them show sequence similarities to the N-acetyl-α-amino acid acylases reported thus far. Both (R)- and (S)-enantioselective N-acetyl-β-Phe acylase were expressed in Escherichia coli. Using these recombinant strains, enantiomerically pure (R)-β-Phe (>99% ee) and (S)-β-Phe (>99% ee) were obtained from the racemic substrate.
Enantioselectivity of purified acylases. N-Ac-(R,S)-β-Phe was incubated with either purified N-Ac-(R)- or (S)-β-Phe acylase. The reaction products were analyzed by HPLC.