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  • Title: Conservation of the 168 divIB gene in Bacillus subtilis W23 and B. licheniformis, and evidence for homology to ftsQ of Escherichia coli.
    Author: Harry EJ, Partridge SR, Weiss AS, Wake RG.
    Journal: Gene; 1994 Sep 15; 147(1):85-9. PubMed ID: 8088553.
    Abstract:
    The chromosomal regions of Bacillus subtilis (Bs) W23 and Bacillus licheniformis (Bl), which span the sequence encoding the homolog of the division initiation gene, divIB, of Bs168 were cloned and sequenced. The high level of conservation of the amino acid (aa) sequence of the DivIB protein (99 and 68% identity for BsW23 and Bl, respectively) was consistent with a significant role for this protein in the cell cycle of the two species. The hydropathy profile for DivIB of Bl was almost identical to that of Bs168 and consistent with a membrane location, as previously established for the latter. The higher than average level of identity (87%) of the 31-aa N-terminal cytoplasmic domain of DivIB between Bs168 and Bl raised the possibility of a special role for this domain. Database analyses using the Bl DivIB sequence and similarity analyses also strongly suggested that DivIB, of Bl and Bs, is a homolog of FtsQ of Escherichia coli. The flanking sequences extending into the unidentified orfs both upstream and downstream from divIB were highly conserved between Bs168 and Bl at both the nucleotide and aa levels. It was confirmed that orf4 of Bs168 is dispensable.
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