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• W2023346220 abstract "Abstract Photoreactivating (PR) enzyme activity has already been demonstrated by us in cell-free extracts of Euglena gracilis var. bacillaris Pringsheim using the Hemophilus transformation assay. This activity can also be detected in extracts using a direct non-biological assay for the photorepair of thymine dimers in DNA. PR enzyme is found in extracts of both wild-type cells and cells of an aplastidic mutant, W 3 BUL, lacking detectable chloroplast DNA, indicating that the PR enzyme is neither coded nor translated exclusively in the chloroplast, but is probably coded in the nucleus and translated in the cytoplasm. Growing cultures of wild-type cells manifest a large increase in PR enzyme activity in vitro upon entering stationary phase. This correlates with the increased photoreactivability of chloroplast inheritance in vivo in stationary phase cells, previously found for Euglena , and suggests that a substantial part of the newly synthesized PR enzyme is available to repair plastid DNA. When dark-grown nondividing wild-type cells are exposed to light, there is a large increase in the specific activity of PR enzyme measured in vitro . This increase is prevented by cycloheximide but not by chloramphenicol or streptomycin, indicating that the enzyme is synthesized on 87s cytoplasmic ribosomes rather than 68s chloroplast ribosomes. Wavelengths of light effective for PR of chloroplast DNA in vivo are also effective for the light induction of PR enzyme. A brief illumination (45 min) of dark-grown nondividing wild-type cells triggers the synthesis of PR enzyme which continues in the absence of light. Growing cultures of W 3 BUL also exhibit a preferential synthesis of PR enzyme in the staionary phase of growth, but the specific activity in vitro is consistently ten times higher than that of wild-type. Dark-grown non-dividing cultures of W 3 BUL also show a cycloheximide-sensitive light induction of PR enzyme synthesis which, however, is dependent on the continued presence of light. The light induction of PR enzyme synthesis can be regarded as the induction of an enzyme by one of its substrates." @default.
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• W2023346220 date "1975-04-01" @default.
• W2023346220 modified "2023-09-26" @default.
• W2023346220 title "Photoreactivating enzyme from Euglena and the control of its intracellular level" @default.
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• W2023346220 doi "https://doi.org/10.1016/0003-9861(75)90504-4" @default.
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