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. 1992 May;174(10):3161–3170. doi: 10.1128/jb.174.10.3161-3170.1992

Regulation of the sacPA operon of Bacillus subtilis: identification of phosphotransferase system components involved in SacT activity.

M Arnaud 1, P Vary 1, M Zagorec 1, A Klier 1, M Debarbouille 1, P Postma 1, G Rapoport 1
PMCID: PMC205982  PMID: 1577686

Abstract

The sacT gene which controls the sacPA operon of Bacillus subtilis encodes a polypeptide homologous to the B. subtilis SacY and the Escherichia coli BglG antiterminators. Expression of the sacT gene is shown to be constitutive. The DNA sequence upstream from sacP contains a palindromic sequence which functions as a transcriptional terminator. We have previously proposed that SacT acts as a transcriptional antiterminator, allowing transcription of the sacPA operon. In strains containing mutations inactivating ptsH or ptsI, the expression of sacPA and sacB is constitutive. In this work, we show that this constitutivity is due to a fully active SacY antiterminator. In the wild-type sacT+ strain or in the sacT30 mutant, SacT requires both enzyme I and HPr of the phosphotransferase system (PTS) for antitermination. It appears that the PTS exerts different effects on the sacB gene and the sacPA operon. The general proteins of the PTS are not required for the activity of SacY while they are necessary for SacT activity.

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Selected References

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