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The target of the DEAH-box NTP triphosphatase Prp43 in Saccharomyces cerevisiae spliceosomes is the U2 snRNP-intron interaction.

MPG-Autoren
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Fourmann,  J. B.
Department of Cellular Biochemistry, MPI for biophysical chemistry, Max Planck Society;

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Dybkov,  O.
Department of Cellular Biochemistry, MPI for biophysical chemistry, Max Planck Society;

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Agafonov,  D. E.
Department of Cellular Biochemistry, MPI for biophysical chemistry, Max Planck Society;

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Urlaub,  H.
Research Group of Bioanalytical Mass Spectrometry, MPI for biophysical chemistry, Max Planck Society;

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Fabrizio,  P.
Department of Cellular Biochemistry, MPI for biophysical chemistry, Max Planck Society;

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Lührmann,  R.
Department of Cellular Biochemistry, MPI for biophysical chemistry, Max Planck Society;

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Zitation

Fourmann, J. B., Dybkov, O., Agafonov, D. E., Tauchert, M. J., Urlaub, H., Ficner, R., et al. (2016). The target of the DEAH-box NTP triphosphatase Prp43 in Saccharomyces cerevisiae spliceosomes is the U2 snRNP-intron interaction. eLife, 5: e15564. doi:10.7554/eLife.15564.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002A-DB03-F
Zusammenfassung
The DEAH-box NTPase Prp43 and its cofactors Ntr1 and Ntr2 form the NTR complex and are required for disassembling intron-lariat spliceosomes (ILS) and defective earlier spliceosomes. However, the Prp43 binding site in the spliceosome and its target(s) are unknown. We show that Prp43 fused to Ntr1's G-patch motif (Prp43_Ntr1GP) is as efficient as the NTR in ILS disassembly, yielding identical dissociation products and recognizing its natural ILS target even in the absence of Ntr1's C-terminal-domain (CTD) and Ntr2. Unlike the NTR, Prp43_Ntr1GP disassembles earlier spliceosomal complexes (A, B, B(act)), indicating that Ntr2/Ntr1-CTD prevents NTR from disrupting properly assembled spliceosomes other than the ILS. The U2 snRNP-intron interaction is disrupted in all complexes by Prp43_Ntr1GP, and in the spliceosome contacts U2 proteins and the pre-mRNA, indicating that the U2 snRNP-intron interaction is Prp43's major target.