… as a targeting or specificity factor is well-recognized by microbiologists. In this review, we
highlight 2 additional σ factor activities: (i) their interaction with other transcription factors and …

… Carol Gross) selected sigma variants that compensated for the poor activity of promoters with
… Identification of three regions essential for interaction between a σ-like factor and core RNA …

… of four sporulation-induced sigma factors that direct transcription of … of these essential genes
when o^ activity is low. a H … The sequential appearance of each sigma factor de termines the …

… Recent genetic and biochemical analyses have confirmed and extended the essential features
of the … Intriguingly, mutational studies of RsbT reveal that kinase activity is not essential for …

… aeruginosa, to act as an anti-sigma activity. This inner … anti-sigma activity leads to the
release of the sigma factor and … None of the genes belonging to the σ E regulon is essential. …

… The expression and activity of alternative σ factors can be controlled at many levels, but …
are structurally closely related to Group 1, but lack σ 1.1 and are non-essential. Where studied, …

… transcribing genesof the essential biosynthetic pathways such … σ factors arecommonly referred
to as alternative sigma factors… anti-σ 28 factor that inhibitsσ 28 activity by direct interaction …

… that were discovered on the basis of biochemical activity (eg, σA) were … of the sigma
factors were found to be the products of genes that were originally identified as sporulation-essential …

… Sigma factors are a class of proteins constituting essential … The association of appropriate
alternative sigma factors with … FpvR also controls the activity of another sigma factor, FpvI (9…

… We present evidence that E is an essential sigma factor at all … sigma factor (4, 13, 14, 18)
that controls the extracytoplasmic stress response in Escherichia coli (9, 15). The activity of σE is …