Schizosaccharomyces pombe Ppr10 and mpa1 together mediate mitochondrial translational initiation
Open accessAbstract
Pentatricopeptide repeat (PPR) proteins are a large family of proteins that act primarily at different posttranscriptional steps of organellar gene expression. We have previously found that the Schizosaccharomyces pombe PPR protein mpal10 interacts with mitochondrial translational activator Mpa1, and both are essential for mitochondrial protein synthesis. However, it is unclear how these two proteins function in mitochondrial protein synthesis in S. pombe. In this study, we further investigated the role of Ppr10 and Mpa1 in mitochondrial protein synthesis. Mitochondrial translational initiation requires two initiation factors, Mti2 and Mti3, which bind to the small subunit of the mitochondrial ribosome (mt-SSU) during the formation of the mitochondrial translational initiation complex. Using sucrose gradient sedimentation analysis, we found that disruption of ppr10, mpa1, or the PPR motifs in Ppr10 impairs the association of Mti2 and Mti3 with the mt-SSU, suggesting that both Ppr10 and Mpa1 may be required for the interaction of Mti2 and Mti3 with the mt-SSU during the assembly of mitochondrial translational initiation complex. Loss of Ppr10 perturbs the association of mitochondrially encoded cytochrome b (cob1) and cytochrome c oxidase subunit 1 (cox1) mRNAs with assembled mitochondrial ribosomes. Proteomic analysis revealed that a fraction of Ppr10 and Mpa1 copurified with a subset of mitoribosomal proteins. The PPR motifs of Ppr10 are necessary for its interaction with Mpa1 and that disruption of these PPR motifs impairs mitochondrial protein synthesis. Our results suggest that Ppr10 and Mpa1 function together to mediate mitochondrial translational initiation.
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SpPpr10p mediates the association of translation initiation factors SpMti2p, SpMti3p, and SpMpa1 with the small mitoribosome subunit.
“SpPpr10p was reported to mediate the association of translation initiation factors (SpMti2p, SpMti3p, and the SpMpa1 matrix protein) with the small mitoribosome subunit (mt-SSU) (Liu et al. 2020; Luo et al. 2021).”
From <i>Candida albicans</i> PPR proteins are required for the expression of respiratory Complex I subunits (2024) · cites this paper as Luo et al. 2021
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Self-citationSchizosaccharomyces pombe Ppr10 is required for mitochondrial translation
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Wenda, J. M., Drzewicka, K., Mulica, P., Tetaud, E., di Rago, J. P., Golik, P., & Łabędzka-Dmoch, K. (2024) · GENETICS · doi:10.1093/genetics/iyae124 · Cited by 2 · see citing works
- Authors
- Luo, Y., Wang, Y., & Huang, Y.
- Affiliations
- Nanjing Normal University (CN)
- Corresponding author
- Huang, Ying
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2021-07
- Volume
- 297
- Issue
- 1
- Pages
- 100869
- ISSN
- 0021-9258 (ISSN-L)
- PMC
- PMC8258696
- OpenAlex
- W3166432529
- Cited by
- 10
- References
- 55
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 3 · 2023: 1 · 2022: 3
- FWCI
- 0.55
- Type
- journal article
- Language
- en
- Update notices
- erratum (2022-08-01)
- Open access
- gold
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- Funders
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- National Natural Science Foundation of China (31470778)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
- Keywords
- pentatricopeptide repeat proteins, mitochondrial ribosome, mitochondrial translation, Schizosaccharomyces pombe
- MeSH terms
- Mitochondrial Ribosomes, Binding Sites, Carrier Proteins, Mitochondria, Peptide Chain Initiation, Translational, Protein Binding, RNA, Messenger, Schizosaccharomyces, RNA-Binding Proteins, Mitochondrial Proteins, Schizosaccharomyces pombe Proteins, Eukaryotic Initiation Factors
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