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recA +-dependent inactivation of the lambda repressor in Escherichia coli lysogens by γ-radiation and by tif expression

✍ Scribed by West, Stephen C. ;Powell, Keith A. ;Emmerson, Peter T.

Publisher: Springer
Year: 1975
Tongue: English
Weight: 493 KB
Volume: 141
Category: Article
ISSN: 0026-8925
DOI: 10.1007/bf00332374

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✦ Synopsis

When gamma lysogens of E. coli are induced by gamma-radiation the gamma repressor, as measured by its specific binding to gamma DNA, is rapidly inactivated by a recA+-dependent process which does not require new protein synthesis. This rapid inactivation is similar to inactivation of repressor by expression of the temperature sensitive E. coli mutation tif. In contrast, induction by UV irradiation or mitomycin C treatment requires new protein synthesis and there is a lag before the repressor is inactivated (Tomizawa and Ogawa, 1967; Shinagawa and Itoh, 1973).

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