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ORFH79 impairs mitochondrial function via interaction with a subunit of electron transport chain complex III in Honglian cytoplasmic male sterile rice.
- Source :
-
The New phytologist [New Phytol] 2013 Apr; Vol. 198 (2), pp. 408-418. Date of Electronic Publication: 2013 Feb 25. - Publication Year :
- 2013
-
Abstract
- Cytoplasmic male sterility (CMS) has attracted great interest because of its application in crop breeding. Despite increasing knowledge of CMS, not much is understood about its molecular mechanisms. Previously, orfH79 was cloned and identified as the CMS gene in Honglian rice, but how the ORFH79 protein causes pollen abortion is still unknown. Through bacterial two-hybrid library screening, P61, a subunit of the mitochondrial electron transport chain (ETC) complex III, was selected as a candidate that interacts with ORFH79. Bimolecular fluorescence complementation (BiFC) and coimmunoprecipitation (coIP) assays verified their interaction inside mitochondria. Blue native polyacrylamide gel electrophoresis (BN-PAGE) and western blotting showed ORF79 and P61 colocalized in mitochondrial ETC complex III of CMS lines. Compared with the maintainer line, Yuetai B (YB), a significant decrease of enzyme activity was detected in mitochondrial complex III of the CMS line, Yuetai A (YA), which resulted in decreased ATP concentrations and an increase in the reactive oxygen species (ROS) content. We propose that the CMS protein, ORFH79, can bind to complex III and decrease its enzyme activity through interaction with P61. This defect results in energy production dysfunction and oxidative stress in mitochondria, which may work as retrograde signals that lead to abnormal pollen development.<br /> (No claim to original Chinese government works New Phytologist © 2013 New Phytologist Trust.)
- Subjects :
- Amino Acid Sequence
Cell Cycle genetics
Electron Transport Complex III chemistry
Electron Transport Complex III genetics
Fluorescence
Gene Expression Regulation, Plant
Genes, Plant genetics
Immunoprecipitation
Molecular Sequence Data
Oryza cytology
Oryza genetics
Plant Proteins chemistry
Plant Proteins genetics
Pollen cytology
Pollen genetics
Protein Binding
Protein Structure, Secondary
Protein Subunits chemistry
Protein Subunits genetics
Protein Transport
Reproduction
Subcellular Fractions metabolism
Two-Hybrid System Techniques
Cytoplasm metabolism
Electron Transport Complex III metabolism
Mitochondria metabolism
Oryza metabolism
Plant Infertility
Plant Proteins metabolism
Protein Subunits metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1469-8137
- Volume :
- 198
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- The New phytologist
- Publication Type :
- Academic Journal
- Accession number :
- 23437825
- Full Text :
- https://doi.org/10.1111/nph.12180