repressor

noun

1. represser.
2. Genetics. a protein that binds DNA at an operator site and thereby prevents transcription of one or more adjacent genes.

noun

1. a person or thing that represses.

noun

1. biochem a protein synthesized under the control of a repressor gene, which has the capacity to bind to the operator gene and thereby shut off the expression of the structural genes of an operon

n.

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

1. A protein that binds to an operator, blocking transcription of an operon and the enzymes for which the operon codes.