title: Use of temperature-sensitive mutants to study gene expression during sporulation in Bacillus subtilis.
abstract: Two temperature-sensitive sporulation mutants have been characterized. One mutant, which is blocked at stage II, has a short temperature-sensitive period that occurs at about the time when the spore septum is formed. Cells can escape the sporulation block, if incubated for a short period at the permissive temperature, but are prevented from doing so by inhibitors of transcription and translation; this suggests that the product of the defective gene is a protein and that the messenger ribonucleic acid which codes for this protein is short-lived. The other mutant is blocked at stage IV to V and has a long temperature-sensitive period that starts during stage III and precedes the stage at which the mutational defect is phenotypically expressed. The behavior of this mutant in temperature-shift experiments suggests that synthesis of the product of the defective gene commences long before it assumes its physiological function.
mesh_terms: D001412:Bacillus subtilis / Q000254:growth & development* / Q000378:metabolism / Q000648:ultrastructure; D001426:Bacterial Proteins / Q000096:biosynthesis; D002473:Cell Wall / Q000648:ultrastructure; D002701:Chloramphenicol / Q000494:pharmacology; D003609:Dactinomycin / Q000494:pharmacology; D005796:Genes; D009154:Mutation; D012329:RNA, Bacterial / Q000096:biosynthesis; D013171:Spores, Bacterial / Q000254:growth & development / Q000378:metabolism / Q000648:ultrastructure; D013696:Temperature
chemical_list: D001426:Bacterial Proteins; D012329:RNA, Bacterial; D003609:Dactinomycin; D002701:Chloramphenicol