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- W2029971914 abstract "The DEAH protein Prp22 is important for the second transesterification step of pre-mRNA splicing, and it is essential for releasing mature mRNA from the spliceosome. Recombinant Prp22 has RNA-stimulated ATPase and ATP-dependent unwinding activities, which are crucial for the mRNA release step. In this study, we characterize the RNA-binding, NTP hydrolysis, and RNA unwinding functions of Prp22. Using nitrocellulose filter binding assays, we determined that the apparent affinity of Prp22 is approximately 20-fold greater for single-stranded RNA than for single-stranded DNA or duplex nucleic acids. Inclusion of hydrolyzable ATP in binding reactions increased the apparent K(D) for RNA by 3-4-fold. The Prp22-RNA interaction is influenced by the length of the RNA chain, and the apparent K(D) values for poly(A)(40) and poly(A)(10) are 17 and 140 nM, respectively. RNA-stimulated ATP hydrolysis is similarly affected by chain length, and optimal activity requires RNA oligomers of >or=20 nt. We show that Prp22 can hydrolyze all common NTPs and dNTPs with comparable efficiencies and that Prp22 unwinds RNA duplexes with 3' to 5' directionality." @default.
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- W2029971914 date "2005-06-18" @default.
- W2029971914 modified "2023-10-07" @default.
- W2029971914 title "Characterization of the NTPase, RNA-Binding, and RNA Helicase Activities of the DEAH-Box Splicing Factor Prp22" @default.
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- W2029971914 doi "https://doi.org/10.1021/bi050407m" @default.
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