Purification and characterization of a cell wall hydrolase encoded by the cw1A gene of Bacillus subtilis |
| |
Authors: | Akio Kuroda Masafumi Imazeki Junichi Sekiguchi |
| |
Institution: | Department of Applied Biology, Faculty of Textile Science and Technology, Shinshu University, Nagano, Japan. |
| |
Abstract: | A cell wall hydrolase of Bacillus subtilis was prepared from Escherichia coli cells harboring a plasmid containing the B. subtilis cwlA gene and purified by hydroxyapatite column chromatography and HPLC through TSK-gel G3000SWXL. In contrast to the molecular mass of 29,919 Da deduced from its nucleotide sequence, the purified CWLA is a 23 kDa protein. Characterization of the specific substrate bond cleaved by CWLA indicated the enzyme is an N-acetylmuramyl-L-alanine amidase. A 32-kDa precursor protein was detected on zymography of a crude cell homogenate. Some of the enzymatic properties of CWLA are also described. |
| |
Keywords: | Cell wall hydroxylase Peptidoglycan Bacillus subtilis l-alanine amidase |
|