title: Functional organization of the riboflavin biosynthesis operon from Bacillus subtilis SHgw.
abstract: We have sequenced 6006 bp DNA of a region from the Bacillus subtilis SHgw chromosome known to contain riboflavin biosynthesis genes (rib gene cluster, 210 degrees on the B. subtilis genetic map). Five of the seven open reading frames found within the sequence are shown to represent the genes ribG, ribB, ribA, ribH and ribTD. The calculated molecular masses for the putative translation products are 39,305, 23,481, 44,121, 16,287 and 14,574 daltons respectively. The five rib genes are transcribed as a polycistronic 4277 nucleotide messenger RNA. The steady-state level of the transcript is negatively regulated by riboflavin. A cis-acting element necessary for regulation was mapped by analysis of constitutive mutations within the 5' untranslated region of the operon. The element is at least 48 bp in length and does not bear obvious similarity to well defined prokaryotic regulatory elements. The molecular mechanism of regulation remains unknown, but the data presented argue against regulation by attenuation.
authors.affiliation: Centre for Bioengineering, Russian Academy of Sciences, Moscow.
authors.forename: V N
authors.initials: VN
authors.lastname: Mironov
authors.forename: A S
authors.initials: AS
authors.lastname: Kraev
authors.forename: M L
authors.initials: ML
authors.lastname: Chikindas
authors.forename: B K
authors.initials: BK
authors.lastname: Chernov
authors.forename: A I
authors.initials: AI
authors.lastname: Stepanov
authors.forename: K G
authors.initials: KG
authors.lastname: Skryabin
mesh_terms: D001412:Bacillus subtilis / Q000235:genetics* / Q000378:metabolism; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics; D001483:Base Sequence; D002874:Chromosome Mapping; D017931:DNA Primers / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D008970:Molecular Weight; D005810:Multigene Family; D009154:Mutation; D016366:Open Reading Frames; D009876:Operon; D012333:RNA, Messenger / Q000235:genetics; D012256:Riboflavin / Q000096:biosynthesis / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D017931:DNA Primers; D012333:RNA, Messenger; D012256:Riboflavin