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PMID: 26161500 Published · epublish English Journal Article Research Support, Non-U.S. Gov't

A composite double-/single-stranded RNA-binding region in protein Prp3 supports tri-snRNP stability and splicing.

eLife ·Vol. 4 ·2015-07-10 ·Pages e07320

Liu S, Mozaffari-Jovin S, Wollenhaupt J, Santos KF, Theuser M, Dunin-Horkawicz S, Fabrizio P, Bujnicki JM, Lührmann R, Wahl MC

Abstract

Prp3 is an essential U4/U6 di-snRNP-associated protein whose functions and molecular mechanisms in pre-mRNA splicing are presently poorly understood. We show by structural and biochemical analyses that Prp3 contains a bipartite U4/U6 di-snRNA-binding region comprising an expanded ferredoxin-like fold, which recognizes a 3'-overhang of U6 snRNA, and a preceding peptide, which binds U4/U6 stem II. Phylogenetic analyses revealed that the single-stranded RNA-binding domain is exclusively found in Prp3 orthologs, thus qualifying as a spliceosome-specific RNA interaction module. The composite double-stranded/single-stranded RNA-binding region assembles cooperatively with Snu13 and Prp31 on U4/U6 di-snRNAs and inhibits Brr2-mediated U4/U6 di-snRNA unwinding in vitro. RNP-disrupting mutations in Prp3 lead to U4/U6•U5 tri-snRNP assembly and splicing defects in vivo. Our results reveal how Prp3 acts as an important bridge between U4/U6 and U5 in the tri-snRNP and comparison with a Prp24-U6 snRNA recycling complex suggests how Prp3 may be involved in U4/U6 reassembly after splicing.

Keywords
S. cerevisiae X-ray crystallography biochemistry biophysics human pre-mRNA splicing protein–RNA interaction small nuclear ribonucleoprotein particle structural biology
MeSH Terms
Crystallography, X-Ray DNA Mutational Analysis Humans Models, Biological Models, Molecular Mutation Nuclear Proteins/chemistry,genetics,metabolism Protein Binding RNA/metabolism RNA Splicing Ribonucleoprotein, U4-U6 Small Nuclear/chemistry,genetics,metabolism Ribonucleoproteins, Small Nuclear/chemistry,metabolism
Chemicals
Nuclear Proteins PRPF3 protein, human Ribonucleoprotein, U4-U6 Small Nuclear Ribonucleoproteins, Small Nuclear RNA
Authors & Affiliations
10 authors, click to expand affiliations / ORCID
Liu Sunbin
Laboratory of Structural Biochemistry, Freie Universität Berlin, Berlin, Germany.
Mozaffari-Jovin Sina
Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
Wollenhaupt Jan
Laboratory of Structural Biochemistry, Freie Universität Berlin, Berlin, Germany.
Santos Karine F
Laboratory of Structural Biochemistry, Freie Universität Berlin, Berlin, Germany.
Theuser Matthias
Laboratory of Structural Biochemistry, Freie Universität Berlin, Berlin, Germany.
Dunin-Horkawicz Stanislaw
Laboratory of Bioinformatics and Protein Engineering, International Institute of Molecular and Cell Biology, Warsaw, Poland.
Fabrizio Patrizia
Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
Bujnicki Janusz M
Laboratory of Bioinformatics and Protein Engineering, International Institute of Molecular and Cell Biology, Warsaw, Poland.
Lührmann Reinhard
Department of Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
Wahl Markus C
Laboratory of Structural Biochemistry, Freie Universität Berlin, Berlin, Germany.
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Article Info
Journal
eLife
Abbr.
Elife
ISSN
2050-084X
Published
2015-07-10
Epub
2015-00-10
Pages
e07320
Language
English
Region
England
NLM ID
101579614
PMCID
PMC4520091
Subset
IM
Databases
PDB
Analysis Services
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