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• W2140446786 startingPage "5942" @default.
• W2140446786 abstract "ABSTRACT The interaction of the Fip1 subunit of polyadenylation factor I with the Saccharomyces cerevisiae poly(A) polymerase (PAP) was assayed in vivo by two-hybrid analysis and was found to involve two separate regions on PAP, located at opposite ends of the protein sequence. In vitro, Fip1 blocks access of the RNA primer to an RNA binding site (RBS) that overlaps the Fip1 carboxy-terminal interaction region and, in doing so, shifts PAP to a distributive mode of action. Partial truncation of this RBS has the same effect, indicating that this site is required for processivity. A comparison of the utilization of ribo- and deoxyribonucleotides as substrates indicates the existence on PAP of a second RBS which recognizes the last three nucleotides at the 3′ end of the primer. This site discriminates against deoxyribonucleotides at the 3′ end, and interactions at this site are not affected by Fip1. Further analysis revealed that the specificity of PAP for adenosine is not simply a function of the ATP binding site but also reflects interactions with bases at the 3′ end of the primer and at another contact site 14 nucleotides upstream of the 3′ end. These results suggest that the unique specificity of PAP for ribose and base, and thus the extent and type of activity with different substrates, depends on interactions at multiple nucleotide binding sites." @default.
• W2140446786 created "2016-06-24" @default.
• W2140446786 creator A5029319648 @default.
• W2140446786 creator A5039371860 @default.
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• W2140446786 date "1998-10-01" @default.
• W2140446786 modified "2023-09-27" @default.
• W2140446786 title "Processivity of the <i>Saccharomyces cerevisiae</i> Poly(A) Polymerase Requires Interactions at the Carboxyl-Terminal RNA Binding Domain" @default.
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• W2140446786 doi "https://doi.org/10.1128/mcb.18.10.5942" @default.
• W2140446786 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/109180" @default.
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