gnt operon mediated by the CcpA protein. Catabolite repression of the Bacillus subtilis

repression.In the genusBacillus, catabolite repression is observed notonly in adaptive enzyme synthesis but also at the onset ofsporulation (4). Catabolite repression of carbon utilizationenzymes might be explained in part by inducer exclusion,becausemanyoftheseenzymesareinducedbytheirsubstrates.Recently, the cis-acting sequences responsible for catabolite