title: Selective expression of a plasmid cat gene at a late stage of Bacillus subtilis sporulation.
abstract: The cat-86 gene in plasmid pPL603 specifies chloramphenicol acetyltransferase (CAT) and is selectively expressed in Bacillus subtilis at a stage in sporulation in which internal spores are first observed (approximately T8). The gene is unexpressed in vegetatively growing cells. cat-86 expression and spore formation are both blocked when cells are grown in excess glucose. cat-86 expression at T8 is due to selective transcription of the gene, since cat-86 mRNA is undetectable in vegetatively growing cells but is readily demonstrated in sporulating cells. The transcription start site for cat-86 mRNA from sporulating cells is within a 203-base-pair restriction fragment designated P1, which is located upstream from the cat coding region on pPL603 . Deletion of P1 from pPL603 eliminates the sporulation -associated expression of cat-86. Host sporulation genes, whose function is absolutely required for cat-86 expression at T8, include six early sporulation, spo0 , genes and spoIIE . Therefore, pPL603 provides a novel system in which the in vivo expression of a known, plasmid-linked gene is dependent on sporulation-specific changes in B. subtilis.
mesh_terms: D000123:Acetyltransferases / Q000235:genetics*; D001412:Bacillus subtilis / Q000235:genetics / Q000502:physiology*; D015500:Chloramphenicol O-Acetyltransferase; D005786:Gene Expression Regulation; D005798:Genes, Bacterial; D010957:Plasmids; D013171:Spores, Bacterial; D014158:Transcription, Genetic
chemical_list: D000123:Acetyltransferases; D015500:Chloramphenicol O-Acetyltransferase