repressor (redirected from Repressor Protein)

repressor /re·pres·sor/ (-pres´er) in genetics, a substance produced by a regulator gene that acts to prevent initiation by the operator gene of protein synthesis by the operon.

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re·pres·sor (r-prsr)

n.

1. One that represses.

2. A protein, especially either of two proteins produced by regulatory genes, that blocks transcription of an operon.

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repressor

[ripres′ər]

Etymology: L, reprimere, to press back

a protein produced by a regulator gene in a bacterial genome. It binds to a sequence of nucleotides in an operator gene, blocking the transcription of one or more structural genes.

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repressor

that which restrains or inhibits; a specific protein molecule coded for by a regulatory gene, which acts to repress the synthesis of a specific protein.

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lac repressor

interacts specifically with the lac operator.