Transcription of the Staphylococcus aureus cid and lrg Murein Hydrolase Regulators Is Affected by Sigma Factor B

Kelly C. Rice, Toni Patton, Soo Jin Yang, Alexis Dumoulin, Markus Bischoff, Kenneth W Bayles

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

The Staphylococcus aureus lrg and cid loci are homologous operons that have been shown to regulate murein hydrolase activity and affect sensitivity to penicillin. Although the mode of action of these operons has not been demonstrated, a model based on the similarities of the lrgA and cidA gene products to the bacteriophage holin family of proteins has been proposed. In this study, the transcription organization and regulation of these operons were examined by Northern blot analyses. Unexpectedly, cidB and a gene located immediately downstream, designated cidC, were found to be cotranscribed on a 2.7-kb transcript. Maximal cidBC transcription occurred during early exponential growth, and high-level transcription of cidBC was dependent on the rsbU-mediated activation of the alternative sigma factor B (CrB). In contrast, IrgAB transcription in stationary phase was negatively regulated by σ B. Although cidABC transcription was not detected by Northern blot analysis, reverse transcriptase PCR revealed that these genes are also cotranscribed as a single RNA message in early exponential growth. Primer extension analysis revealed the presence of two cidBC transcription start sites, but no apparent σB-dependent promoter consensus sequence was identified in these regions. The rsbU gene was also shown to have a positive impact on murein hydrolase activity but a negligible effect on sensitivity to penicillin-induced killing. These results suggest that the lrgAB and cidBC genes may be part of the S. aureus σB-controlled stress regulon.

Original languageEnglish (US)
Pages (from-to)3029-3037
Number of pages9
JournalJournal of bacteriology
Volume186
Issue number10
DOIs
StatePublished - May 1 2004

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N-Acetylmuramoyl-L-alanine Amidase
Sigma Factor
Staphylococcus aureus
Operon
Genes
Penicillins
Northern Blotting
Regulon
Transcription Initiation Site
Consensus Sequence
Growth
Reverse Transcriptase Polymerase Chain Reaction
Bacteriophages
RNA
Proteins

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

Cite this

Transcription of the Staphylococcus aureus cid and lrg Murein Hydrolase Regulators Is Affected by Sigma Factor B. / Rice, Kelly C.; Patton, Toni; Yang, Soo Jin; Dumoulin, Alexis; Bischoff, Markus; Bayles, Kenneth W.

In: Journal of bacteriology, Vol. 186, No. 10, 01.05.2004, p. 3029-3037.

Research output: Contribution to journalArticle

Rice, Kelly C. ; Patton, Toni ; Yang, Soo Jin ; Dumoulin, Alexis ; Bischoff, Markus ; Bayles, Kenneth W. / Transcription of the Staphylococcus aureus cid and lrg Murein Hydrolase Regulators Is Affected by Sigma Factor B. In: Journal of bacteriology. 2004 ; Vol. 186, No. 10. pp. 3029-3037.
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