Jun, 2000
Purification, characterization, and primary structure of a novel cell wall hydrolytic amidase, CwhA, from Achromobacter lyticus
JOURNAL OF BIOCHEMISTRY
- ,
- ,
- Volume
- 127
- Number
- 6
- First page
- 1033
- Last page
- 1039
- Language
- English
- Publishing type
- Publisher
- JAPANESE BIOCHEMICAL SOC
A novel bacteriolytic enzyme CwhA (cell wall hydrolytic amidase) was purified by ion exchange and gel-filtration chromatographies from a commercial bacteriolytic preparation from Achromobacter lyticus, CwhA exhibited optimal pH at 8.5 and lysed CHCl3-treated Escherichia coli more efficiently than Micrococcus luteus, Staphylococcus aureus, Enterococcus faecalis, and Pediococcus acidilactici, The enzyme was inhibited by 1,10-phenanthroline strongly and by EDTA to a lesser extent, suggesting that it is probably a metalloenzyme, Amino acid composition and mass spectrometric analyses for the CwhA-derived M. luteus muropeptides revealed that CwhA is N-acetylmuramoyl-L-alanine amidase [EC 3.5.1.28]. The complete amino acid sequence of CwhA was established by a combination of Edman degradation and mass spectrometry for peptides obtained by Achromobacter protease I (API) digestion and cyanogen bromide (CNBr) cleavage. The enzyme consists of a single polypeptide chain of 177 amino acid residues with one disulfide bond, Cys114-Cys121. CwhA was found to be homologous to N-acetylmuramoyl-L-alanine amidase from bacteriophage T7 (BPT7). Its sequence identity with BPT7 is 35%, but the amino acid residues functioning as zinc ligands in BPT7 are absent in CwhA. These results suggest that CwhA is a new type of N-acetylmuramoyl-L-alanine amidase.
- Link information
- ID information
-
- ISSN : 0021-924X
- Web of Science ID : WOS:000087526900012