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FEBS Lett. 2009 Jul 7;583(13):2237-43. doi: 10.1016/j.febslet.2009.05.053. Epub 2009 Jun 6.

Distinct roles of the two isoforms of the dynamin-like GTPase Mgm1 in mitochondrial fusion.

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1
Adolf-Butenandt-Institut für Physiologische Chemie, Ludwig-Maximilians-Universität München, München, Germany.

Abstract

The mitochondrial dynamin-like GTPase Mgm1 exists as a long (l-Mgm1) and a short isoform (s-Mgm1). They both are essential for mitochondrial fusion. Here we show that the isoforms interact in a homotypic and heterotypic manner. Their submitochondrial distribution between inner boundary membrane and cristae was markedly different. Overexpression of l-Mgm1 exerts a dominant negative effect on mitochondrial fusion. A functional GTPase domain is required only in s-Mgm1 but not in l-Mgm1. We propose that l-Mgm1 acts primarily as an anchor in the inner membrane that in concert with the GTPase activity of s-Mgm1 mediates the fusion of inner membranes.

PMID:
19505460
DOI:
10.1016/j.febslet.2009.05.053
[Indexed for MEDLINE]
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