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- W1551115285 abstract "Partially purified extracts from Chlorella pyrenoidosa and Chlamydomonas reinhardtii catalyze the cleavage of queuosine (Q), a modified 7-deazaguanine nucleoside found exclusively in the first position of the anticodon of certain tRNAs, to queuine, the base of Q. This is the first report of an enzyme that specifically cleaves a 7-deazapurine riboside. Guanosine is not a substrate for this activity, nor is the epoxide a derivative of Q. We also establish that both algae can incorporate exogenously supplied queuine into their tRNA but lack Q-containing tRNA when cultivated in the absence of queuine, indicating that they are unable to synthesize Q de novo. Although no physiological function for Q has been identified in these algae, Q cleavage to queuine would enable algae to generate queuine from exogenous Q in the wild and also to salvage (and recycle) queuine from intracellular tRNA degraded during the normal turnover process. In mammalian cells, queuine salvage occurs by the specific cleavage of queuine from Q-5'-phosphate. The present data also support the hypothesis that plants, like animals, cannot synthesize Q de novo." @default.
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- W1551115285 date "1988-12-01" @default.
- W1551115285 modified "2023-09-26" @default.
- W1551115285 title "Novel salvage of queuine from queuosine and absence of queuine synthesis in Chlorella pyrenoidosa and Chlamydomonas reinhardtii" @default.
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- W1551115285 doi "https://doi.org/10.1128/jb.170.12.5633-5641.1988" @default.
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