repressor
the protein product of a regulator gene that prevents transcription of a gene at some other locus
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
Repressor
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Repressor
A repressor is a protein that turns off the expression of one or more genes. The repressor protein works by binding to the gene's promoter region, preventing the production of messenger RNA (mRNA).
Narration Transcription ...
The lac repressor is an enzyme which stops the metabolism of lactose in bacteria as long as glucose is available. When glucose is scarce and lactose is plentiful the lac repressor becomes inactive to permit the conversion of lactose to glucose.
a repressor that cannot combine with an operator gene until it has combined with a corepressor (usually a product of a protein pathway); after activation, the repressor arrests production of the proteins controlled by the operator gene; ...
The Tryptophan Repressor
In E. coli, the synthesis of the amino acid tryptophan from precursors available to the cell requires 5 enzymes.
Repressor
A gene product that negatively regulates gene expression. Usually refers to a DNA-binding protein that inhibits transcription under certain conditions.
repressor
reproductive isolation
Two populations of organisms are isolated if their members are unable to interbreed and produce fertile offspring.
repressor protein - DNA regulatory protein that binds the operator (a specific DNA sequence) in the absence of the inducing substance (in the case of the lac operon, lactose).
Repressor. A DNA-binding protein in prokaryotes that blocks gene transcription by binding to the operator.
Repressor A protein that binds to an operator sequence and inhibits the transcription of the structural genes in the operon.
repressor A compound that binds to and controls the regulator in gene regulation.
reproductive barrier The factors that prevent one sexually propagating population from interbreeding and exchanging genes with another population.
The repressor protein is produced by a regulator gene. The region of DNA where the repressor protein binds is the operator site. The promoter site is a region of DNA where RNA polymerase can bind.
genes for the repressor, a regulatory protein
C.
gene for RNA polymerase ...
A prokaryotic regulatory element that interacts with a repressor to control the transcription of adjacent structural genes. Organelle. A cell structure that carries out a specialized function in the life of a cell. Origin of replication.
Talk a little bit about repressors and activators.
In terms of a biological process, in order to get it going, one always usually thinks of activators.
The term introduced by Jacob, Perrin, Sanchez and Monod (1960) for the site at one end of an operon where a repressor molecule binds to the DNA and thereby inhibits transcription.
The plasmid contains a Lac repressor gene. Insertion of a DNA fragment inside the repressor gene disrupts its function, resulting in GFP expression. We currently have vector strains with Blue as well as Green Fluorescent Proteins.
The regulator gene codes for a repressor protein that binds to the operator, obstructing the promoter (thus, transcription) of the structural genes. The regulator does not have to be adjacent to other genes in the operon.
The metabolite that when bound to the repressor (of a repressible operon) forms a functional unit that can bind to its operator and block transcription.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
OPERATOR - The site on DNA at which a repressor protein binds to prevent transcription from initiating at the adjacent promoter.
 See also: Protein, Trans, DNA, Gene, Transcript
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