Schizosaccharomyces pombe Mti2 and Mti3 act in conjunction during mitochondrial translation initiation.
Schizosaccharomyces pombe
Mti2
Mti3
mitochondria
translation initiation
Journal
The FEBS journal
ISSN: 1742-4658
Titre abrégé: FEBS J
Pays: England
ID NLM: 101229646
Informations de publication
Date de publication:
11 2019
11 2019
Historique:
received:
27
05
2019
revised:
23
06
2019
accepted:
24
07
2019
pubmed:
28
7
2019
medline:
17
6
2020
entrez:
28
7
2019
Statut:
ppublish
Résumé
Mitochondrial DNA encodes key subunits of the oxidative phosphorylation complexes essential for ATP production. Translation initiation in mitochondria requires two general factors, mtIF2 and mtIF3, whose counterparts in bacteria are essential for protein synthesis. In this study, we report the characterization of the fission yeast Schizosaccharomyces pombe mtIF2 (Mti2) and mtIF3 (Mti3). Deletion of mti2 impairs cell growth on the respiratory medium. The growth defect of the mti2 deletion mutant can be suppressed by expressing IFM1, the Saccharomyces cerevisiae homolog of Mti2, demonstrating functional conservation between the two proteins. Deletion of mti2 also impairs mitochondrial protein synthesis. Unlike mti2, deletion of mti3 does not affect cell growth on respiratory media and mitochondrial translation. However, deletion of mti3 exacerbates the growth defect of the Δmti2 mutant, suggesting that the two proteins have distinct, but partially overlapping functions during the process of mitochondrial translation initiation in S. pombe. Both Mti2 and Mti3 are associated with the small subunit of the mitochondrial ribosome (mitoribosome). Disruption of mti2, but not mti3, causes dissociation of the mitoribosome and also abolishes Mti3 binding to the small subunit of the mitoribosome. Our results suggest that Mti2 and Mti3 bind in a sequential manner to the small subunit of the mitoribosome and that Mti3 facilitates the function of Mti2 in mitochondrial translation initiation. Our findings also support the view that the importance of the mitochondrial translation initiation factors varies among the organisms.
Substances chimiques
Electron Transport Chain Complex Proteins
0
Eukaryotic Initiation Factors
0
Mitochondrial Proteins
0
Schizosaccharomyces pombe Proteins
0
mti2 protein, S pombe
0
mti3 protein, S pombe
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
4542-4553Subventions
Organisme : the Priority Academic Program Development of Jiangsu Higher Education Institutes
Pays : International
Organisme : National Natural Science Foundation of China
ID : 31770810
Pays : International
Informations de copyright
© 2019 Federation of European Biochemical Societies.
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