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Appl Environ Microbiol. 1993 December; 59(12): 4313-4316

Antimicrobial activity of a newly identified bacteriocin of Bacillus cereus.

Department of General and Environmental Physiology, University Federico II, Naples, Italy.

ABSTRACT

A bacteriocin-producing Bacillus cereus strain was isolated. The bacteriocin, here called cerein, was shown to be active specifically against other B. cereus strains and inactive against all other bacterial species tested. Cerein was detected in the culture supernatants of stationary-phase cells, and its appearance was inhibited by induction of sporulation. The bacterial activity of cerein was insensitive to organic solvents and nonproteolytic enzymes, partially stable to heat, and active over a wide range of pH values. Direct detection of antimicrobial activity on sodium dodecyl sulfate-polyacrylamide gel suggested an apparent molecular mass of about 9 kDa.

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