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- W2103037377 abstract "One molecule of ADP-ribose 1″,2″-cyclic phosphate (Appr>p) is formed during each of the approximately 500 000 tRNA splicing events per Saccharomyces cerevisiae generation. The metabolism of Appr>p remains poorly defined. A cyclic phosphodiesterase (Cpd1p) has been shown to convert Appr>p to ADP-ribose-1″-phosphate (Appr1p). We used a biochemical genomics approach to identify two yeast phosphatases that can convert Appr1p to ADP-ribose: the product of ORF YBR022w (now Poa1p), which is completely unrelated to other known phosphatases; and Hal2p, a known 3′-phosphatase of 5′,3′-pAp. Poa1p is highly specific for Appr1p, and thus likely acts on this molecule in vivo. Poa1 has a relatively low KM for Appr1p (2.8 μM) and a modest kcat (1.7 min−1), but no detectable activity on several other substrates. Furthermore, Poa1p is strongly inhibited by ADP-ribose (KI, 17 μM), modestly inhibited by other nucleotides containing an ADP-ribose moiety and not inhibited at all by other tested molecules. In contrast, Hal2p is much more active on pAp than on Appr1p, and several other tested molecules were Hal2p substrates or inhibitors. poa1-Δ mutants have no obvious growth defect at different temperatures in rich media, and analysis of yeast extracts suggests that ∼90% of Appr1p processing activity originates from Poa1p." @default.
- W2103037377 created "2016-06-24" @default.
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- W2103037377 creator A5019470184 @default.
- W2103037377 creator A5060123979 @default.
- W2103037377 date "2005-01-19" @default.
- W2103037377 modified "2023-09-26" @default.
- W2103037377 title "A highly specific phosphatase that acts on ADP-ribose 1''-phosphate, a metabolite of tRNA splicing in Saccharomyces cerevisiae" @default.
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- W2103037377 doi "https://doi.org/10.1093/nar/gki211" @default.
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