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. 1970 Apr;102(1):64–71. doi: 10.1128/jb.102.1.64-71.1970

Possible Involvement of β-Lactamase in Sporulation in Bacillus cereus1

Joy Hochstadt Ozer a,2, Arthur K Saz a
PMCID: PMC284970  PMID: 4985546

Abstract

Nonreverting β-lactamase-negative strains were isolated from the β-lactamase-constitutive strain, Bacillus cereus 569 H. These strains differed from both β-lactamase-inducible and -constitutive strains not only in failure to produce β-lactamase but also in failure to autolyze on aging, delayed sporulation, and failure to release free spores from sporangia when produced. The addition of B. cereus β-lactamase of 15% purity to a final concentration of 10 IU/ml stimulates sporulation and particularly the release of free spores in culture from sporangia of strain 569 (inducible wild-type), 569/H (constitutive mutant of 569), and HPen−, a nonreverting β-lactamase strain isolated from 569/H in this laboratory. Cultures of HPen− did not release free spores without this treatment. Similar stimulation of sporulation and spore release by β-lactamase from B. cereus were observed in another β-lactamase-negative strain derived from 569/H as well as in certain sporogeny mutants of B. subtilis. The β-lactamase preparation used in these experiments was free of peptidases, proteases, and autolysins capable of solubilizing wall from vegetative cells. These results, taken with our previous finding that a soluble peptidoglycan inducer becomes available in cultures of B. cereus only at sporulation and that normal derepression of β-lactamase accompanies normal sporulation, suggest that β-lactamase in B. cereus may be involved in peptidoglycan metabolism during sporulation and possibly the breakdown of sporangial wall with the concomitant release of mature spores.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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