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The organization of the

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Three different lambda phage clones with overlapping inserts of Bacillus subtilis DNA, which cover the region from spoIIAA to serA, have been isolated. The nucleotide sequence of their inserts, starting after spoVAF and ending at serA, has been determined. A contiguous sequence of 35354 bp was established, including previously analysed overlapping adjacent regions. Within the newly determined sequence 31 open reading frames (ORFs) with putative ribosome‐binding sites have been found. Nine of them correspond to previously sequenced and characterized genes: spoVAF, lysA, sipS, ribG, ribB, ribA, ribH, ribTD and dacB. Comparison of the amino acid sequences of the products encoded by the other ORFs to known proteins allowed putative functions to be assigned to seven of these ORFs. Among these are the following: (i) the ppiB gene, encoding a cytoplasmic peptidylprolyl isomerase; (ii) two pairs of signal‐transducers, one homologous to phoR–phoP of B. subtilis, encoding regulators of phosphatase biosynthesis, and the second to the fecI–fecR of Escherichia coli, which is responsible for the regulation of the citrate‐dependent iron (III) transport system; (iii) aroC and serA genes, involved in the biosynthesis of aromatic amino acids and serine, respectively, the function of which has beer: confirmed by constructing corresponding mutants with disrupted ORFs. The organization of putative operons has been postulated on the basis of the sequences of their transcription terminators, promoters and regulatory elements.
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Document Type: Original Article

Affiliations: Laboratoire de Génétique Microbienne, Institut National de la Recherche Agronomique, Domaine de Vilvert, 78352 Jouy en Josas Cedex, France

Publication date: October 1, 1993

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