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Which sigma factor is bound to Rse A?

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Which sigma factor is bound to Rse A?

(a) σ^D

(b) σ^G

(c) σ^F

(d) σ^E

The question was asked during an online exam.

I'd like to ask this question from Transcription in Prokaryotes : Sigma Factor topic in section Gene Expression : Transcription Prokaryotes of Cytogenetics

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The correct option is (d) σ^E

Explanation: Rse A binds σ^E and prevents it from activating transcription. Under extreme conditions this binding is broken by cleavage of c terminal cytosolic tail of transmambrane Rse A, thus releasing σ^E for transcribing necessary genes.

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