Dictionary > Repressor protein

Repressor protein

Definition
noun, plural: repressor proteins
A protein in which its binding to the operator inhibits the transcription of one or more genes
Supplement
Repressor proteins can be DNA– or RNA-binding:

  • DNA-binding repressors – block the binding of RNA polymerase to the promoter. As a result, the gene is prevented from being transcribed into mRNA
  • RNA-binding repressors – bind to mRNA, preventing protein translation

Examples of repressor proteins are lac repressor that inhibits the expression of lac operon in E. coli. Another is MetJ, a methionine repressor of met operon.
Repressor proteins are influenced by the presence of other molecules, such as corepressors and inducers. Corepressors are molecules that bind and activate repressors. Inducers, on the other hand, bind and regulate repressors by inducing the latter to undergo conformational change thereby decreasing binding affinity to the operator.
See also:

Related term(s):

  • repression
  • aporepressor
  • Met repressor operator complex
  • Lactose repressor
  • Mentioned in:


    You will also like...

    Adaptive Radiation
    Adaptive Radiation

    The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..

    Structural depiction of catalase, an enzyme
    Protein Activity and Cellular Metabolism

    Proteins have a crucial role in various biological activities. Get to know how proteins are able to perform as enzymes, ..

    Control of body movement
    Control of Body Movement

    Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..

    Types and Causes of Brain Damage
    Types and Causes of Brain Damage

    This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

    Biological Cell Defense
    Biological Cell Defense

    Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..

    Freshwater aquatic plankton
    Freshwater Communities & Plankton

    Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..