Senn MM Bischoff M von Eiff C Berger-Bächi B 2005 Inactivation of hemB in Staphylococcus aureus strain Newman resulted in a small-colony phenotype and was accompanied by an altered expression pattern of global regulators and control of virulence factor production. Transcription profiles followed over 15 h by Northern blot analyses revealed that transcripts of the global regulators arl, rot, sae, sarR, sarS, srr, svrA, and sigB disappeared after the exponential phase and that both agr transcripts were completely absent in the hemB mutant. Apart from a general concentration of transcriptional activity to the exponential phase, premature gene expression was observed for rot, hla, and spa. Nevertheless, reported sigmaB-dependent transcripts, such as sarC and clfA, were produced throughout the 15-h growth period monitored. The absence of these transcripts in a hemB sigB double mutant demonstrated their dependence on sigmaB and indicated an unexpected, permanent sigmaB activity in the hemB mutant. Variations in the extents of the directly sigmaB-controlled asp23, rsbVW-sigB, and sarC transcripts argue for additional factors modulating sigmaB activity. This study provides the first extended synopsis of the transcriptional patterns of different regulators over the entire growth cycle in the widely used Newman strain. application/pdf https://sonar.ch/global/documents/4149 eng info:eu-repo/semantics/altIdentifier/doi/10.1128/JB.187.21.7397-7406.2005 info:eu-repo/semantics/altIdentifier/pmid/16237023 info:eu-repo/semantics/openAccess Journal of bacteriology. - 2005 Bacterial Proteins Blotting, Northern Gene Deletion Gene Expression Profiling Gene Expression Regulation, Bacterial Gene Fusion Genes, Bacterial Genes, Regulator Genes, Reporter Luciferases Mutagenesis, Insertional Porphobilinogen Synthase RNA, Bacterial RNA, Messenger Sigma Factor Staphylococcus aureus Virulence Factors sigmaB activity in a Staphylococcus aureus hemB mutant. http://purl.org/coar/resource_type/c_6501