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Rapid Isolation of the Mitoribosome from HEK Cells
Published on: October 4, 2018
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MTG1 couples mitoribosome large subunit assembly with intersubunit bridge formation.
Hyun-Jung Kim1, Antoni Barrientos1,2
1Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA.
Nucleic Acids Research
|August 8, 2018
Summary
Human MTG1 protein is crucial for mitochondrial ribosome assembly, preventing cardiovascular defects. Its function ensures proper mitochondrial translation and ribosome quality control.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Mammalian mitochondrial ribosomes (mitoribosomes) synthesize essential oxidative phosphorylation proteins.
- Mitoribosome dysfunction is linked to mitochondrial disorders, including cardiomyopathy.
- Cofactors aiding mitoribosome biogenesis are largely uncharacterized.
Purpose of the Study:
- To investigate the function of the conserved ribosome assembly GTPase, human MTG1, in mitoribosome biogenesis.
- To elucidate the role of MTG1 in cardiovascular health and mitochondrial translation.
Main Methods:
- MTG1-silencing in human cardiomyocytes and zebrafish.
- Gene-editing and biochemical approaches in HEK293T cells.
Main Results:
- MTG1-silencing caused early cardiovascular lesions in cardiomyocytes and zebrafish.
- MTG1 binds to the large subunit (mtLSU) 16S ribosomal RNA, aiding late-assembly protein incorporation.
- MTG1 interacts with mtLSU uL19 and mtSSU mS27 to facilitate MTG1 release and mB6 bridge formation.
Conclusions:
- MTG1 acts as a quality control checkpoint in mitoribosome assembly.
- MTG1 couples mtLSU assembly with intersubunit bridge formation via mS27-acquired GEF activity.
- MTG1 is essential for mammalian mitochondrial translation and cardiovascular integrity.
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