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Mitochondrial uncoupling proteins in mammals and plants
J Borecký1, I G Maia, P Arruda
1Department of Membrane Transport Biophysics. Institute of Physiology, Academy of Sciences of the Czech Republic, Prague.
Bioscience Reports
|December 1, 2001
Summary
Uncoupling proteins (UCPs) are vital mitochondrial proteins found across diverse species. While UCP1 aids thermogenesis, the functions of other UCP types remain largely unknown but may involve energy balance and oxidative stress protection.
Area of Science:
- Mitochondrial biology and molecular evolution.
- Biochemistry and comparative genomics of protein families.
Background:
- Uncoupling proteins (UCPs) are part of the mitochondrial anion carrier family, with diverse types identified in mammals, plants, and other organisms.
- UCPs share conserved structural motifs, suggesting an ancient evolutionary origin predating the divergence of major eukaryotic kingdoms.
Purpose of the Study:
- To review the structural, evolutionary, and functional aspects of uncoupling proteins.
- To explore the phylogenetic relationships and potential roles of different UCP types.
Main Methods:
- Analysis of molecular, biochemical, and phylogenetic data.
- Comparison of conserved structural motifs across UCPs from various species.
Main Results:
- Identified five UCP types in mammals and plants, with recent discoveries in other taxa.
- Mammalian UCP1, UCP2, UCP3, and plant pUCP1/pUCP2 form a subgroup; UCP4 and BMCP1 form another.
- Phylogenetic data suggest UCP2 as a potential prototype.
Conclusions:
- UCPs likely evolved from anion transporters before the split of animal, fungal, and plant lineages.
- UCP1 is primarily involved in non-shivering thermogenesis.
- Other UCPs may regulate energy expenditure, protect against reactive oxygen species, and influence plant processes like fruit ripening.