The product of a regulator or r. gene.
- active r. a r. that combines directly with an operator gene to repress the operator and its structural genes, thus repressing protein synthesis; an active r. may be repressed by an inducer, with resulting protein synthesis; a homeostatic mechanism for regulation of inducible enzyme systems.
- inactive r. a r. that cannot combine with an operator gene until it has combined with a corepressor (usually a product of a protein pathway); after activation, the r. arrests production of the proteins controlled by the operator gene; a homeostatic mechanism for regulation of repressible enzyme systems.

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re·pres·sor ri-'pres-ər n one that represses esp a protein that is determined by a regulatory gene, binds to a genetic operator, and inhibits the initiation of transcription of messenger RNA

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re·pres·sor (re-presґər) [L. “a restrainer”] in genetics, a protein produced by a regulator gene that binds to the operator region of a structural gene to block initiation of transcription of the gene or operon.

Medical dictionary. 2011.

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  • repressor — repressor. См. репрессор. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Repressor — Repressor, vom ⇒ Regulatorgen codiertes, die Aktivität des ⇒ Operators regulierendes Protein in Protocyten; dient der ⇒ Genregulation bei Prokaryoten, wie sie durch das ⇒ Jacob Monod Modell beschrieben ist …   Deutsch wörterbuch der biologie

  • repressor — |ô| adj. s. m. Que ou aquele que reprime …   Dicionário da Língua Portuguesa

  • repressor — [ri pres′ər] n. something that represses; esp., a protein produced in a cell that prevents the synthesis of a specific enzyme: also sp. represser …   English World dictionary

  • Repressor — For other uses, see repression 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.Repressor proteins are coded for by… …   Wikipedia

  • Repressor — Als Repressor bezeichnet man in der Genetik ein DNA bindendes Regulator Protein, welches an den Operator bindet und damit die Bindung der RNA Polymerase an den Promotor blockiert, wodurch die Transkription des Gens (oder Operons) verhindert wird …   Deutsch Wikipedia

  • repressor — represorius statusas T sritis augalininkystė apibrėžtis Reguliuojančiojo geno koduojamas baltymas, kuris stabdo geno operatoriaus veiklą ir dėl to įsijungia operonas. atitikmenys: angl. repressor rus. репрессор …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • repressor — noun Etymology: New Latin Date: 1611 one that represses; especially a protein that is determined by a regulatory gene, binds to a genetic operator, and inhibits the initiation of transcription of messenger RNA …   New Collegiate Dictionary

  • repressor — /ri pres euhr/, n. 1. represser. 2. Genetics. a protein that binds DNA at an operator site and thereby prevents transcription of one or more adjacent genes. [1955 60; < L; see REPRESS, TOR] * * * …   Universalium

  • repressor — noun a) Anything that represses. b) Any protein that binds to DNA and thus regulates the expression of genes by decreasing the rate of transcription …   Wiktionary