The Bacillus subtilis regulator SinR inhibits spoIIG promoter transcription in vitro without displacing RNA polymerase.

AUTOR(ES)

Cervin, M A

RESUMO

Initiation of sporulation in Bacillus subtilis is controlled by several regulators which affect activation by phosphorylation of the key response regulator Spo0A or transcription of Spo0A-P-dependent genes. In vivo overexpression of one of these regulators, sinR , results in suppression of transcription from the Spo0A-P-dependent promoters of spo0A , spoIIA , spoIIE and spoIIG and in vitro SinR binds to the promoters of the spoIIA operon and the spo0A gene. In this study we have demonstrated that in vitro SinR directly repressed Spo0A- P-dependent transcription by B.subtilis RNA polymerase from the spoIIG operon promoter. SinR inhibited transcription prior to formation of heparin-resistant complexes but did not displace RNA polymerase from the spoIIG promoter. DNase I protection studies demonstrated that SinR protected a large region of the spoIIG promoter and induced DNase I hypersensitive sites, particularly around the 0A boxes, at the same positions as those induced by zinc. Since binding of zinc induces bends in the DNA, we concluded that SinR binding also altered the conformation of the spoIIG promoter. We propose that SinR-induced conformational changes in Spo0A-dependent promoters prevent activation of trans-cription by Spo0A-P.

Documentos Relacionados

• Activation of the Bacillus subtilis spoIIG promoter requires interaction of Spo0A and the sigma subunit of RNA polymerase.
• Surfaces of Spo0A and RNA Polymerase Sigma Factor A That Interact at the spoIIG Promoter in Bacillus subtilis
• Surfaces of Spo0A and RNA Polymerase Sigma Factor A That Interact at the spoIIG Promoter in Bacillus subtilis
• Binding of Spo0A stimulates spoIIG promoter activity in Bacillus subtilis.
• A Region in the Bacillus subtilis Transcription Factor Spo0A That Is Important for spoIIG Promoter Activation