lac operon (redirected from Lactose operon)

lac operon

the lactose operon, a nucleotide sequence in Escherichia coli that controls the synthesis of the enzyme ß-galactosidase comprising binding sequence motifs for the cap protein, which activates transcription, the repressor protein, which inhibits transcription, and a region with which RNA polymerase interacts. The first, best studied and best understood model for gene regulation.