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CMS-G from Beta vulgaris ssp. maritima is maintained in natural populations despite containing an atypical cytochrome c oxidase
- Source :
- Biochemical Journal, Biochemical Journal, Portland Press, 2018, 475, pp.759-773. ⟨10.1042/BCJ20170655⟩, Biochemical Journal, 2018, 475, pp.759-773. ⟨10.1042/BCJ20170655⟩
- Publication Year :
- 2018
- Publisher :
- HAL CCSD, 2018.
-
Abstract
- While mitochondrial mutants of the respiratory machinery are rare and often lethal, cytoplasmic male sterility (CMS), a mitochondrially inherited trait that results in pollen abortion, is frequently encountered in wild populations. It generates a breeding system called gynodioecy. In Beta vulgaris ssp. maritima, a gynodioecious species, we found CMS-G to be widespread across the distribution range of the species. Despite the sequencing of the mitochondrial genome of CMS-G, the mitochondrial sterilizing factor causing CMS-G is still unknown. By characterizing biochemically CMS-G, we found that the expression of several mitochondrial proteins is altered in CMS-G plants. In particular, Cox1, a core subunit of the cytochrome c oxidase (complex IV), is larger but can still assemble into complex IV. However, the CMS-G-specific complex IV was only detected as a stabilized dimer. We did not observe any alteration of the affinity of complex IV for cytochrome c; however, in CMS-G, complex IV capacity is reduced. Our results show that CMS-G is maintained in many natural populations despite being associated with an atypical complex IV. We suggest that the modified complex IV could incur the associated cost predicted by theoretical models to maintain gynodioecy in wild populations.
- Subjects :
- 0301 basic medicine
Genetics
Mitochondrial DNA
[SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE]
Cytochrome c
Protein subunit
Cytoplasmic male sterility
Mutant
Cell Biology
Gynodioecy
Biology
medicine.disease_cause
Biochemistry
03 medical and health sciences
030104 developmental biology
health services administration
Pollen
biology.protein
medicine
Cytochrome c oxidase
Molecular Biology
health care economics and organizations
ComputingMilieux_MISCELLANEOUS
Subjects
Details
- Language :
- English
- ISSN :
- 02646021 and 14708728
- Database :
- OpenAIRE
- Journal :
- Biochemical Journal, Biochemical Journal, Portland Press, 2018, 475, pp.759-773. ⟨10.1042/BCJ20170655⟩, Biochemical Journal, 2018, 475, pp.759-773. ⟨10.1042/BCJ20170655⟩
- Accession number :
- edsair.doi.dedup.....718a3557bdf246877a77f1c3b73c0e8c