| 释义 |
reˈpressor
Also 8 -our.
[a. L. repressor, agent-n. f. reprimĕre to repress: cf. represser.]
1. One who, or that which represses. rare.
1611Florio, Ripressore, a repressor. 1676G. Towerson Decalogue 416 No furtherer of uncleanness but on the contrary the repressor of it. 1725J. Lewis Life Pecock (1744) 62 An account of a book published by the bishop, entituled, The repressour [etc.]. 1860(title) The repressor of over much blaming of the clergy, by Reginald Pecock.
2. Biochem. A substance which by its action on an operon can inhibit the synthesis of a specific enzyme or set of enzymes.
1957H. J. Vogel in McElroy & Glass Chem. Basis Heredity ii. 286 In order to facilitate further discussion, the following terminology will be used hereafter: a relative decrease, resulting from the exposure of cells to a given substance, in the rate of synthesis of a particular apoenzyme is termed ‘enzyme repression’; the substance thus decelerating enzyme synthesis is a ‘represser’ (‘repressor’); an enzyme-forming system that can be antagonized by a represser is ‘repressible’; and, under conditions of repression, the formation of the enzyme is ‘repressed’. 1964G. H. Haggis et al. Introd. Molecular Biol. x. 273 Either inducible cells contain built-in repressors, which are inactivated by added inducers, or repressible enzyme synthesis depends on intracellular inducers inactivated by external repressors. There is evidence that the first of these alternatives is the correct one. 1971J. Z. Young Introd. Study Man iii. 54 The repressor is produced by a regulator gene. 1973B. J. Williams Evolution & Human Origins vi. 91/1 Diffusable repressor substances that form complexes with specific operator regions prevent the mRNA transcription. |