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. 1987 Feb;169(2):461–469. doi: 10.1128/jb.169.2.461-469.1987

Effects of plasmid propagation of a sporulation promoter on promoter utilization and sporulation in Bacillus subtilis.

P Zuber, J M Healy, R Losick
PMCID: PMC211799  PMID: 3027029

Abstract

Transcription of the sporulation gene spoVG of Bacillus subtilis is induced at the onset of spore formation and depends on the products of the regulatory genes spoOA, spoOB, and spoOH. We describe two effects of propagating the promoter region of spoVG on a multicopy plasmid replicon in B. subtilis cells. One effect is that transcription from the plasmid-borne spoVG promoter is altered with respect to the time of its induction and the dependence on spoO gene products. An example of this effect is that plasmid propagation was observed to relieve substantially the inhibitory effect of a mutation in spoOH, the spoO gene upon which spoVG promoter activity is most strongly dependent. We present results which suggest that propagation on a plasmid replicon causes an alteration in the conformation of spoVG promoter DNA which somehow compensates for the defective spoOH gene product. Plasmid propagation did not, however, entirely eliminate the requirement for the spoOH gene product; little or no spoVG-directed RNA synthesis was observed in cells bearing a putative spoOH deletion mutation, a finding which indicates that SpoOH protein plays an indispensable role in spoVG promoter utilization. Another effect of propagating the promoter region of spoVG on a multicopy plasmid is to inhibit sporulation. S1 nuclease mapping experiments suggest that amplification of spoVG on a multicopy plasmid causes the titration of a transcription factor or minor form of RNA polymerase holoenzyme required for utilization of one of the two overlapping promoters which comprise the spoVG transcription initiation region.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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