PMID: 2507524Oct 1, 1989Paper

Nucleotide sequence and genetic organization of the Bacillus subtilis comG operon

Journal of Bacteriology
M AlbanoD Dubnau

Abstract

A series of Tn917lac insertions define the comG region of the Bacillus subtilis chromosome. comG mutants are deficient in competence and specifically in the binding of exogenous DNA. The genes included in the comG region are first expressed during the transition from the exponential to the stationary growth phase. From nucleotide sequence information, it was concluded that the comG locus contains seven open reading frames (ORFs), several of which overlap at their termini. High-resolution S1 nuclease mapping and primer extension were used to identify the 5' terminus of the comG mRNA. The sequence upstream from the comG start site closely resembled the consensus recognition sequence for the major B. subtilis vegetative RNA polymerase holoenzyme. Complementation analysis confirmed that the comG ORF1 protein is required for the ability of competent cultures to resolve into two populations with different cell densities on Renografin (E. R. Squibb & Sons, Princeton, N.J.) gradients, as well as for full expression of comE, another late competence locus. The predicted comG ORF1 protein showed significant similarity to the virB ORF11 protein from Agrobacterium tumefaciens, which is probably involved in T-DNA transfer. The N-terminal seq...Continue Reading

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Citations

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