repressor

repressor

[ri-pres-er]
noun
2.
Genetics. a protein that binds DNA at an operator site and thereby prevents transcription of one or more adjacent genes.

Origin:
1955–60; < Latin; see repress, -tor

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World English Dictionary
repressor (rɪˈprɛsə)
 
n
biochem a protein synthesized under the control of a repressor gene, which has the capacity to bind to the operator gene and thereby shut off the expression of the structural genes of an operon

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American Heritage
Medical Dictionary

repressor re·pres·sor (rĭ-prěs'ər)
n.

  1. One that represses.

  2. A protein, especially either of two proteins produced by regulatory genes, that blocks transcription of an operon.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
repressor   (rĭ-prěs'ər)  Pronunciation Key 
A protein that binds to an operator, blocking transcription of an operon and the enzymes for which the operon codes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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