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- W2130366855 abstract "DNA photolyase, a DNA repair enzyme encoded by the phr gene of Escherichia coli, is normally regulated at 10 to 20 active molecules per cell. In purA mutants deprived of adenine, this amount increased sixfold within 2 h. Operon fusions placing lacZ under transcriptional control of phr promoters indicated no change in transcription rate during adenine deprivation, and gene fusions of phr with lacZ showed a nearly constant level of translation as well. Immunoblot analysis indicated that the total amount of photolyase protein remained constant during enzyme amplification. On the other hand, treatment of cells with chloramphenicol during the adenine deprivation prevented any increase. DNA regions lying 1.3 to 4.2 kb upstream of the phr coding sequences were necessary for this amplification to occur and for this purpose would function in trans. These results suggest that adenine deprivation leads to a posttranslational change, involving synthesis of protein encoded by sequences lying upstream of phr, which increases photolyase activity. The amplification in activity was found to be reversible, for when adenine was restored, the photolyase activity declined before cell growth resumed." @default.
- W2130366855 created "2016-06-24" @default.
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- W2130366855 creator A5067137899 @default.
- W2130366855 date "1990-12-01" @default.
- W2130366855 modified "2023-09-27" @default.
- W2130366855 title "Regulation of photolyase in Escherichia coli K-12 during adenine deprivation" @default.
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- W2130366855 doi "https://doi.org/10.1128/jb.172.12.6885-6891.1990" @default.
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