Cloning, sequencing and expression of a Bacillus bacteriolytic enzyme in Escherichia coli - PubMed (original) (raw)
Cloning, sequencing and expression of a Bacillus bacteriolytic enzyme in Escherichia coli
C Potvin et al. Mol Gen Genet. 1988 Oct.
Abstract
Several hundred bacterial isolates were screened for bacteriolytic activity by growing them on agar medium containing autoclaved, lyophilized Micrococcus lysodeikticus cells as the substrate. A Bacillus sp. producing the largest lytic zone was selected. A genomic bank of this selected bacterium was constructed in the multi-functional vector pTZ18R, with partial SauIIIA DNA fragments inserted at the SalI restriction site. Screening of 800 colonies of this bank for cell lysis gave 5 recombinants exhibiting lytic activity, as detected by analysis of extracts of sonicated Escherichia coli cells on denaturing polyacrylamide gels containing autoclaved, lyophilized M. lysodeikticus cells as the substrate. One clone (pBH2500), expressed in E. coli strain NM522, was found to code for a lytic enzyme corresponding, in molecular weight, to the 27 kDa Bacillus sp. hydrolase. This clone with an insertion of 2.5 kb was then subcloned as a 929 bp EcoRI-SauIIIA fragment in pTZ18R (pBH929) and showed higher cell lytic activity. A unique open reading frame for a protein of 251 amino acids, followed by a putative terminator sequence, was found after a consensus ribosome binding site. A putative leader sequence was identified in the first 37 amino acids. One truncated subclone (pBH703), corresponding to 196 out of 251 residues from the protein N-terminal end, still possessed lytic activity.
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