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J. Bacteriol., 01 1995, 166-175, Vol 177, No. 1
JR LeDeaux and AD Grossman
Phosphorylation of the transcription factor encoded by spo0A is required
for the initiation of sporulation in Bacillus subtilis. Production and
accumulation of Spo0A-P is controlled by histidine protein kinases and the
spo0 gene products. To identify additional genes that might be involved in
the initiation of sporulation and production of Spo0A-P, we isolated genes
which when present on a multicopy plasmid could suppress the sporulation
defect of a spo0K mutant. kinC was one gene isolated in this way. A
multicopy plasmid containing kinC completely or partially suppressed the
sporulation defect caused by mutations in spo0K, kinA, spo0F, and spo0B,
indicating that at least when overexpressed, KinC is capable of stimulating
phosphorylation of Spo0A independently of the normal phosphorylation
pathway. The predicted product of kinC is 428 amino acids long and is most
similar to KinA and KinB, the histidine protein kinases involved in the
initiation of sporulation. In otherwise wild-type strains, kinC null
mutations caused little or no defect in sporulation under the conditions
tested. However, in the absence of a functional phosphorelay (spo0F or
spo0B), KinC appears to be the kinase responsible for phosphorylation of
the sof-1 and rvtA11 forms of Spo0A.
Copyright © 1995, American Society for Microbiology
Isolation and characterization of kinC, a gene that encodes a sensor kinase homologous to the sporulation sensor kinases KinA and KinB in Bacillus subtilis
Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.
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