Abstract
The autolysins of Lactobacillus helveticus ISLC5 were detected and partially characterized by renaturing sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis with substrate-containing gels (zymogram). By using lyophilized Micrococcus luteus cells or heated whole cells of L. helveticus ISLC5 (0.2% [wt/vol]) as a substrate, several lytic activities were detected in the whole-cell SDS extract of strain ISLC5 (i) one activity at 42.4 kDa, which was named autolysin A, and (ii) six other activities having very similar molecular weights (29.1, 29.6, 30, 30.8, 31.7, and 32.8 kDa), which were named autolysins B (B1 through B6, respectively). As regards the temporal distribution of the enzymes, autolysins A and B were detected in the cells harvested from the beginning of the exponential growth phase. Autolysin A appeared to be associated only with viable cells, whereas the autolysins B remained associated with the cell envelope several days after the complete loss of culture viability. When SDS-treated walls of L. helveticus ISLC5 were used as a substrate, a supplementary lytic activity appeared at 37.5 kDa; it was considered a peptidoglycan hydrolase, since it was not able to induce lysis of whole-cell substrate. The autolysi...Continue Reading
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