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Comparative Studies on Induction of Sporulation and Synthesis of Inducible Enzymes in Bacillus subtilis

^a Microbiology Unit, Department of Biochemistry, University of Oxford, Oxford, England, and Institut de Microbiologie, Université de Paris-Sud, 91405, Orsay, France

ABSTRACT

An attempt was made to determine whether sporulation and inducible enzyme synthesis in Bacillus subtilis are controlled by the same mechanism of catabolite repression. By the use of a thymine-requiring strain, it has been shown that, whereas sporulation remained repressed unless chromosome replication proceeded to completion, the induction of the enzymes histidase, sucrase, and -glucosidase proceeded quite normally in the absence of continued deoxyribonucleic acid synthesis. It is concluded that the mechanism for overcoming the repression of sporulation differs qualitatively from that involved in overcoming the repression of inducible enzyme synthesis. Attempts to isolate pleiotropic mutants that would provide additional support for this contention were unsuccessful. A pleiotropic mutant deficient in phosphoenolpyruvate-dependent phosphotransferase activity sporulated quite well, whereas a mutant presumed deficient in glutamate synthetase sporulated poorly under all conditions.

¹ Present address: Department of Microbiology, University of Glasgow, Garscube Estate, Bearsden, Glasgow, U.K.