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Structural Patching Fosters Divergence of Mitochondrial Ribosomes
Anton S Petrov1, Elizabeth C Wood1, Chad R Bernier1
1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA.
Molecular Biology and Evolution
|December 6, 2018
Summary
Mitochondrial ribosomes (mitoribosomes) show remarkable species diversity. Rapid evolution of mitochondrial rRNAs, patched by compensatory elements, drives this divergence, shaping mitoribosome structure and function.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Structural Biology
Background:
- Mitochondrial ribosomes (mitoribosomes) synthesize proteins encoded by the mitochondrial genome.
- Mitoribosomes exhibit significant structural variability across different species, a phenomenon not yet fully understood.
Purpose of the Study:
- To investigate the compositional and evolutionary history of mitoribosomes.
- To elucidate the structural basis for mitoribosome diversity across the phylogenetic tree.
Main Methods:
- Combined 3D structural data with comparative analysis of mitochondrial rRNA secondary structures.
- Analyzed available proteomic data to map structural variation.
- Reconstructed evolutionary stages of the mitoribosomal large subunit.
Main Results:
- Identified a critical role for ablation and expansion of rapidly evolving mitochondrial rRNAs.
- Observed that structural instabilities are resolved by acquiring compensatory elements, enabling rapid evolution.
- Documented specific examples like mt-tRNA incorporation in mammalian mitoribosomes and altered polypeptide exit tunnels in yeast mitoribosomes.
Conclusions:
- The evolution of mitoribosome diversity is driven by rapid mitochondrial rRNA changes and compensatory structural patching.
- Divergent evolutionary pathways, utilizing different compensatory elements, lead to the increasing structural divergence of mitoribosomes across species.
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