aporepressor
A regulatory protein which, when combined with another corepressor, undergoes allosteric transformation, allowing it to combine with an operator locus and inhibit transcription of certain genes.

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apo·re·pres·sor (ap″o-re-presґər) an inactive form of a repressor (q.v.), requiring binding of a corepressor to become a functional repressor.

Medical dictionary. 2011.

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