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Translation of which sigma factor is dependent on a genetic thermostat?

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Translation of which sigma factor is dependent on a genetic thermostat?

(a) Sigma 70

(b) Sigma 32

(c) Sigma E

(d) Sigma S

I got this question by my school principal while I was bunking the class.

Question is from Control of Translation topic in division Gene Expression : Translation of Cytogenetics

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Correct answer is (b) Sigma 32

To elaborate: When the temperature is favorable the sigma 32 gene is hidden from initiation by complex mRNA structure. When the temperature rises, this complex opens up stabilizing the mRNA of sigma 32 thus leading to increase in its translation. This is like a genetic thermostat.

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