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The nine biosynthesis genes of theNocardia lactamdurans cephamycin cluster are expressed as three different mRNAs initiating at promoterslatp ,cefDp , andpcbABp , as shown by low-resolution S1 nuclease protection assays and Northern blotting analysis. Bidirectional expression occurred from divergent promoters (latp andcefDp ) located in a 629-bp intergenic region that contains three heptameric direct repeats similar to those recognized by members of the SARP (Streptomyces antibiotic regulatory proteins) family. Thelat gene is transcribed in a single monocistronic transcript initiating atlatp . A second unusually long polycistronic mRNA (more than 16 kb) corresponding to six biosynthesis genes (pcbAB ,pcbC ,cmcI ,cmcJ ,cefF , andcmcH ) started atpcbABp . A third polycistronic mRNA corresponding to thecefD andcefE genes started atcefDp .

journal of bacteriology

The Nine Genes of the <i>Nocardia lactamdurans</i> Cephamycin Cluster Are Transcribed into Large mRNAs from Three Promoters, Two of Them Located in a Bidirectional Promoter Region

The Nine Genes of the Nocardia lactamdurans Cephamycin Cluster Are Transcribed into Large mRNAs from Three Promoters, Two of Them Located in a Bidirectional Promoter Region