Physical and functional characterization of the Bacillus subtilis spoIIM gene.
The spoIIM locus of Bacillus subtilis is the most recently discovered of six genetic loci in which mutations can prevent the synthesis of a normal asymmetric septum or prevent migration of the septal structure to engulf the forespore compartment of the sporangium. Ultrastructure studies of a spoIIM mutant confirmed a block prior to the completion of engulfment. Introduction of a spoIIM mutation into a panel of strains containing lacZ fusions belonging to different regulatory classes allowed us to determine that the spoIIM gene product is required for the efficient expression of genes transcribed by sigma G-associated RNA polymerase but is not required for the expression of sigma F-controlled genes, including spoIIIG, which encodes sigma G. The results of complementation studies, gene disruption analysis, and DNA sequencing revealed that the spoIIM locus contains a single sporulation-essential gene encoding a polypeptide with a predicted molecular mass of 24,850 Da. The predicted spoIIM gene product is highly hydrophobic and very basic, and it does not exhibit significant homology to sequence files in several major data bases.
Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia 19104.
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Smith
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Bayer
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Youngman
D000595:Amino Acid Sequence; D001412:Bacillus subtilis / Q000235:genetics* / Q000648:ultrastructure; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D002451:Cell Compartmentation / Q000235:genetics; D002455:Cell Division / Q000235:genetics; D003001:Cloning, Molecular; D005798:Genes, Bacterial / Q000235:genetics*; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D009024:Morphogenesis / Q000235:genetics; D016254:Mutagenesis, Insertional; D015183:Restriction Mapping; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012808:Sigma Factor; D012995:Solubility; D013171:Spores, Bacterial / Q000235:genetics*; D014157:Transcription Factors
D001426:Bacterial Proteins; D012808:Sigma Factor; D014157:Transcription Factors; C092468:spoIIR protein, Bacillus subtilis; C030069:spore-specific proteins, Bacillus