| 释义 |
operon Biol.|ˈɒpərɒn|
[ad. F. opéron (F. Jacob et al. 1960, in Compt. Rend. CCL. 1729), f. opér- (in opérer to effect, work, opération operation, etc.): see -on1.]
A unit of co-ordinated gene activity which is believed to account for inducible and repressible enzymes in bacteria and hence for the regulation of protein synthesis, and is usu. conceived as a linear sequence of genetic material comprising an operator, a promoter, and one or more structural genes.
1961Jacob & Monod in Jrnl. Molecular Biol. III. 344 This genetic unit of co-ordinate expression we shall call the ‘operon’. 1969Nature 18 Jan. 219/2 Essentially, Grodzicker and Zipser's experiment was to take strongly polar nonsense mutants of the lactose operon of E. coli. 1969A. M. Campbell Episomes ix. 116 The genes of one operon are all transcribed onto the same messenger molecule. 1971J. Z. Young Introd. Study Man iii. 59 Each operon is controlled by one or more regulator genes. 1973B. J. Williams Evolution & Human Origins vi. 91/1 The model of genetic control receiving the most attention today is that of the operon. |