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de Francisco Amorim M, Willing EM, Szabo EX, Francisco-Mangilet AG, Droste-Borel I, Maček B, Schneeberger K, Laubinger S. The U1 snRNP Subunit LUC7 Modulates Plant Development and Stress Responses via Regulation of Alternative Splicing. Plant Cell 2018; 30:2838-2854. [PMID: 30309899 PMCID: PMC6305971 DOI: 10.1105/tpc.18.00244] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 09/11/2018] [Accepted: 10/05/2018] [Indexed: 05/21/2023]
Abstract
Introns are removed by the spliceosome, a large macromolecular complex composed of five ribonucleoprotein subcomplexes (U snRNPs). The U1 snRNP, which binds to 5' splice sites, plays an essential role in early steps of the splicing reaction. Here, we show that Arabidopsis thaliana LETHAL UNLESS CBC7 (LUC7) proteins, which are encoded by a three-member gene family in Arabidopsis, are important for plant development and stress resistance. We show that LUC7 is a U1 snRNP accessory protein by RNA immunoprecipitation experiments and LUC7 protein complex purifications. Transcriptome analyses revealed that LUC7 proteins are not only important for constitutive splicing, but also affect hundreds of alternative splicing events. Interestingly, LUC7 proteins specifically promote splicing of a subset of terminal introns. Splicing of LUC7-dependent introns is a prerequisite for nuclear export, and some splicing events are modulated by stress in a LUC7-dependent manner. Taken together, our results highlight the importance of the U1 snRNP component LUC7 in splicing regulation and suggest a previously unrecognized role of a U1 snRNP accessory factor in terminal intron splicing.
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Affiliation(s)
- Marcella de Francisco Amorim
- Centre for Plant Molecular Biology (ZMBP), University of Tuebingen, 72076 Tuebingen, Germany
- Chemical Genomics Centre of the Max Planck Society, 44227 Dortmund, Germany
- Max Planck Institute for Developmental Biology, 72076 Tuebingen, Germany
| | - Eva-Maria Willing
- Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Emese X Szabo
- Centre for Plant Molecular Biology (ZMBP), University of Tuebingen, 72076 Tuebingen, Germany
- Chemical Genomics Centre of the Max Planck Society, 44227 Dortmund, Germany
- Max Planck Institute for Developmental Biology, 72076 Tuebingen, Germany
- Carl von Ossietzky University, 26129 Oldenburg, Germany
| | - Anchilie G Francisco-Mangilet
- Centre for Plant Molecular Biology (ZMBP), University of Tuebingen, 72076 Tuebingen, Germany
- Chemical Genomics Centre of the Max Planck Society, 44227 Dortmund, Germany
- Max Planck Institute for Developmental Biology, 72076 Tuebingen, Germany
- Carl von Ossietzky University, 26129 Oldenburg, Germany
| | | | - Boris Maček
- Proteome Centre, University of Tuebingen, 72076 Tuebingen, Germany
| | | | - Sascha Laubinger
- Centre for Plant Molecular Biology (ZMBP), University of Tuebingen, 72076 Tuebingen, Germany
- Chemical Genomics Centre of the Max Planck Society, 44227 Dortmund, Germany
- Max Planck Institute for Developmental Biology, 72076 Tuebingen, Germany
- Carl von Ossietzky University, 26129 Oldenburg, Germany
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