sigma factor


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Related to sigma factor: RNA polymerase, TATA box

sigma factor

[′sig·mə ‚fak·tər]
(cell and molecular biology)
A regulatory protein in prokaryotes that combines with the ribonucleic acid (RNA) polymerase enzyme to facilitate the initiation of RNA synthesis.
References in periodicals archive ?
Among the set of promoters under the control of a single and the same sigma factor, the level of transcription varies depending on the culture conditions or the growth phase.
30] DeVries CA, Ohman DE Mucoid-to-nonmucoid conversion in alginate-producing Pseudomonas aeruginosa often results from spontaneous mutations in algT, encoding a putative alternate sigma factor, and shows evidence for autoregulation.
CTX-M-14], nikB, putative sigma factor, rci, pilN, and pCT008-009) and when compared with pCT had identical flanking regions adjacent to [bla.
The bacteria's defenses are controlled by an alternative sigma factor, a protein that acts as a switch for certain genes.
Other section topics include biosensors, biocontrol, bottled water, Enterobacter sakazakii, food sanitizers, milk, probiotics, proteobacteria, quorum sensing, and sigma factors.