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Lysogenic Conversion to Phospholipase A Production in Bacillus cereus

Institute of Microbiology, Medical University, Szeged, Hungary

A double lysogenic Bacillus cereus strain w (, wx) induced with mitomycin C liberates phages and wx. In addition the lysis of the organism is associated with the accumulation of a bacteriocin which was identified as phospholipase A. When the bacteria were cured of prophage wx they lost the enzyme production ability; the w () bacteria, named for convenience as cin^- bacteria, could be converted to phospholipase A production by wx phage infection. Phage wx and its mutant wxc were very slowly adsorbed by cin^- bacteria in a liquid medium and did not propagate noticeably, but the presence of agar led to normal multiplication. The rate of lysogenic conversion was also enhanced by agar. The bulk of the enzyme produced by the convertant was isolated as a homomolecular protein and identified as phospholipase A.

Received 5 February 1974; accepted 18 April 1974.