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Mitochondrial fusion depends on the evolutionary conserved dynamin, OPA1/Mgm1p/Msp1p, whose activity is controlled by proteolytic processing. Since processing diverges between Mgm1p (Saccharomyces cerevisiae) and OPA1 (mammals), we explored this process in another model, Msp1p in Schizosaccharomyces pombe. Generation of the short isoform of Msp1p neither results from the maturation of the long isoform nor correlates with mitochondrial ATP levels. Msp1p is processed by rhomboid and a protease of the matrix ATPase associated with various cellular activities (m-AAA) family. The former is involved in the generation of short Msp1p and the latter in the stability of long Msp1p. These results reveal that Msp1p processing may represent an evolutionary switch between Mgm1p and OPA1.

Original publication

DOI

10.1016/j.febslet.2010.05.060

Type

Journal article

Journal

FEBS Lett

Publication Date

16/07/2010

Volume

584

Pages

3153 - 3157

Keywords

Adenosine Triphosphatases, Animals, Biological Evolution, Dynamins, Humans, Mammals, Membrane Fusion, Mitochondria, Optic Atrophy, Autosomal Dominant, Protein Isoforms, Saccharomyces cerevisiae, Schizosaccharomyces