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OPA1 processing controls mitochondrial fusion and is regulated by mRNA splicing, membrane potential, and Yme1L

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Item Type:Article
Title:OPA1 processing controls mitochondrial fusion and is regulated by mRNA splicing, membrane potential, and Yme1L
Creators Name:Song, Z., Chen, H., Fiket, M., Alexander, C. and Chan, D.C.
Abstract:OPA1, a dynamin-related guanosine triphosphatase mutated in dominant optic atrophy, is required for the fusion of mitochondria. Proteolytic cleavage by the mitochondrial processing peptidase generates long isoforms from eight messenger RNA (mRNA) splice forms, whereas further cleavages at protease sites S1 and S2 generate short forms. Using OPA1-null cells, we developed a cellular system to study how individual OPA1 splice forms function in mitochondrial fusion. Only mRNA splice forms that generate a long isoform in addition to one or more short isoforms support substantial mitochondrial fusion activity. On their own, long and short OPA1 isoforms have little activity, but, when coexpressed, they functionally complement each other. Loss of mitochondrial membrane potential destabilizes the long isoforms and enhances the cleavage of OPA1 at S1 but not S2. Cleavage at S2 is regulated by the i-AAA protease Yme1L. Our results suggest that mammalian cells have multiple pathways to control mitochondrial fusion through regulation of the spectrum of OPA1 isoforms.
Keywords:Cultured Cells, Fibroblasts, GTP Phosphohydrolases, Membrane Fusion, Membrane Potentials, Messenger RNA, Metalloendopeptidases, Mitochondria, Protein Isoforms, RNA Splicing, Animals, Mice
Source:Journal of Cell Biology
ISSN:0021-9525
Publisher:Rockefeller University Press
Volume:178
Number:5
Page Range:749-755
Date:27 August 2007
Additional Information:The original publication is available at http://www.jcb.org/.
Official Publication:https://doi.org/10.1083/jcb.200704110
PubMed:View item in PubMed

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