Medical Dictionary


noun co·ac·ti·va·tor \(ˈ)kō-ˈak-tə-ˌvā-tər\

Medical Definition of coactivator

  1. :  a protein or protein complex that activates genetic transcription usually by binding to a transcription factor Gene-regulatory proteins that do not themselves bind DNA but assemble on DNA-bound gene regulatory proteins are often termed coactivators or corepressors, depending on their effect on transcription initiation.—Bruce Alberts et al., Molecular Biology of the Cell, 2002

Seen and Heard

What made you want to look up coactivator? Please tell us where you read or heard it (including the quote, if possible).