Document Detail

Cloning, expression and characterization of d-aminoacylase from Achromobacter xylosoxidans subsp. denitrificans ATCC 15173.
MedLine Citation:
PMID:  23369306     Owner:  NLM     Status:  Publisher    
d-Aminoacylase catalyzes the conversion of N-acyl-d-amino acids to d-amino acids and fatty acids. The aim of this study was to identify the d-aminoacylase gene from Achromobacter xylosoxidans subsp. denitrificans ATCC 15173 and investigate the biochemical characterization of the enzyme. A previously uncharacterized d-aminoacylase gene (ADdan) from this organism was cloned and sequenced. The open reading frame (ORF) of ADdan was 1467bp in size encoding a 488-amino acid polypeptide. ADdan, with a high amino acid similarity to N-acyl-d-aspartate amidohydrolase from Alcaligenes A6, showed relatively low sequence similarities to other characterized d-aminoacylases. The recombinant ADdan protein was expressed in Escherichia coli BL21 (DE3) using pET-28a with a T7 promoter. The enzyme was purified in a single chromatographic step using nickel affinity gel column. The molecular mass of the expressed protein, calculated by SDS-PAGE, was about 52kDa. The purified ADdan showed optimal activity at pH 8.0 and 50°C, and was stable at pH 6.0-8.0 and up to 45°C. Its activity was inhibited by Cu(2+), Fe(2+), Ca(2+), Mn(2+), Ni(2+), Zn(2+) and Hg(2+), whereas Mg(2+) had no significant influence on this recombinant d-aminoacylase. This is the first report on the characterization of d-aminoacylase with activity towards both N-acyl derivatives of neutral d-amino acids and N-acyl-d-aspartate. The characteristics of ADdan could prove to be of interest in industrial production of d-amino acids.
Wei Wang; Huange Xi; Qirui Bi; Ying Hu; Yang Zhang; Mengxiang Ni
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-28
Journal Detail:
Title:  Microbiological research     Volume:  -     ISSN:  1618-0623     ISO Abbreviation:  Microbiol. Res.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-2-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9437794     Medline TA:  Microbiol Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Elsevier GmbH. All rights reserved.
School of Life Science & Technology, China Pharmaceutical University, No. 24, Tong Jia Xiang, Nanjing 210009, PR China.
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