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• W2994860319 endingPage "1434" @default.
• W2994860319 startingPage "1423" @default.
• W2994860319 abstract "U6 snRNA undergoes post-transcriptional 3' end modification prior to incorporation into the active site of spliceosomes. The responsible exoribonuclease is Usb1, which removes nucleotides from the 3' end of U6 and, in humans, leaves a 2',3' cyclic phosphate that is recognized by the Lsm2-8 complex. Saccharomycescerevisiae Usb1 has additional 2',3' cyclic phosphodiesterase (CPDase) activity, which converts the cyclic phosphate into a 3' phosphate group. Here we investigate the molecular basis for the evolution of Usb1 CPDase activity. We examine the structure and function of Usb1 from Kluyveromyces marxianus, which shares 25 and 19% sequence identity to the S. cerevisiae and Homo sapiens orthologs of Usb1, respectively. We show that K. marxianus Usb1 enzyme has CPDase activity and determined its structure, free and bound to the substrate analog uridine 5'-monophosphate. We find that the origin of CPDase activity is related to a loop structure that is conserved in yeast and forms a distinct penultimate (n - 1) nucleotide binding site. These data provide structural and mechanistic insight into the evolutionary divergence of Usb1 catalysis." @default.
• W2994860319 created "2019-12-26" @default.
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• W2994860319 date "2019-12-13" @default.
• W2994860319 modified "2023-10-14" @default.
• W2994860319 title "Structural basis for the evolution of cyclic phosphodiesterase activity in the U6 snRNA exoribonuclease Usb1" @default.
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• W2994860319 doi "https://doi.org/10.1093/nar/gkz1177" @default.
• W2994860319 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7026655" @default.
• W2994860319 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31832688" @default.
• W2994860319 hasPublicationYear "2019" @default.
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