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Catabolite-insensitive Revertants Of Lac Promoter Mutants.

A. Silverstone, R. Arditti, B. Magasanik
Published 1970 · Biology, Medicine

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The maximum rate of expression of the lac operon is severely reduced in lac promoter mutants. Revertants of these mutations which produce higher levels of enzyme were isolated. Some of these revertants had lost sensitivity to catabolite repression and transient repression. The mutations responsible for these losses took place at sites very close to the original promoter mutations. From these results we conclude that the promoter itself is the target site for both catabolite and transient repression of the lac operon.



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