The protein product of a regulator gene that acts to control transcription of inducible and repressible operons. A molecule that binds to the operator and prevents transcription of an operon. Generally any molecule that can reversibly inactivate a gene.
a protein product made by one gene in the bacterium in order to control a second gene by turning it off when its product is not wanted
a protein that can regulate a gene by turning it on and off
a protein that inhibits expression of a gene
A protein that regulates a gene by turning it off.
A protein that binds to an operator adjacent to a structural gene, inhibiting transcription of that gene.
A protein which binds to a specific DNA sequence (the operator) upstream from the transcription initiation site of a gene or operon and prevents RNA polymerase from commencing mRNA synthesis. Examples of repressors are the C1 protein of bacteriophage and the lac 1 protein of the lac operon.
A protein coded by the regulatory gene. The repressor can bind to a specific operator and prevent transcription of the operon.
A gene product that negatively regulates gene expression. Usually refers to a DNA-binding protein that inhibits transcription under certain conditions. Transcriptional repressors typically decrease the transcription of certain other genes by specifically binding to operator sites -- one or more short DNA sequences located upstream of the structural gene. Regulation of repression is usually modulated by a ligand which binds to the repressor protein and alters its DNA-binding properties. DNA-binding may be increased by association with a co-repressor or DNA-binding may be decreased by association with an inducer.
a protein that inhibits the transcription of a gene (or genes) by binding to an operator sequence of DNA.
a protein synthesized by a regulator gene that binds to an operator locus and blocks transcription of that operon
Protein that binds with an operator on bacterial DNA to block transcription.
A repressor is a DNA-binding protein that regulates the expression of one or more genes by decreasing the rate of transcription. This blocking of expression is called repression.
