(redirected from Repressor Protein)
Also found in: Dictionary, Thesaurus, Medical.
Related to Repressor Protein: aporepressor


see nucleic acidnucleic acid,
any of a group of organic substances found in the chromosomes of living cells and viruses that play a central role in the storage and replication of hereditary information and in the expression of this information through protein synthesis.
..... Click the link for more information.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a special regulating protein formed in bacterial cells that halts transcription, which is the synthesis of messenger ribonucleic acid (m-RNA) from a specific operon (a group of genes that carry out the synthesis of functionally related enzymes). The number of different repressors corresponds to the number of operons.

Unlike other proteins, a repressor present in a cell consists of ten to 20 molecules. The synthesis of m-RNA ceases when a repressor combines with an operator, which is the regulating part of an operon. An effector, for example, lactose in a lactose operon, interacts with a repressor to form a complex that inactivates and produces a reversible spatial change in a repressor molecule. This type of repressor can no longer combine with an operator and, as a result, m-RNA synthesis resumes.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


An end product of metabolism which represses the synthesis of enzymes in the metabolic pathway.
The product of a regulator gene that acts to repress the transcription of another gene.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
On the other hand, by binding to C1 repressor protein, the gene product Lxc renders C1 repressor less likely to bind to other regions along the DNA (1, 9, 10, 13, 20).
The P1 repressor protein, encoded by the c1 gene, is responsible for maintaining the P1 prophage in the lysogenic state.
A repressor protein coding sequence with a promoter that is active all of the time; and
A recombinase coding sequence, controlled by a promoter that would be active at all times, except that it is also regulated by repressor protein, which can be overridden with tetracycline.
The mechanism by which a key hormone called auxin regulates the growth and development of plants by promoting the degradation of repressor proteins has been discovered by researchers at The University of Texas at Austin.
Domain III contains an amphipat hic [beta][alpha][alpha]-fold, found in [beta]-ribbon DNA-binding domains of prokaryotic repressor proteins.
It was renamed as HIRA because the most significant peptides were similar to Hir1p and Hir2p which were two histone gene repressor proteins from the yeast Saccharomyces cerevisiae.
In addition, cell proliferation repressor proteins, p27 and p21, also were induced in this in vitro model.