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Traffic. 2009 Feb;10(2):161-71. doi: 10.1111/j.1600-0854.2008.00855.x. Epub 2008 Nov 11.

Dictyostelium Tom1 participates to an ancestral ESCRT-0 complex.

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IFR 128 BioSciences Gerland-Lyon Sud, Institut de Biologie et Chimie des Protéines, UMR5086 - CNRS/Université Lyon I, 7 Passage du Vercors, 69367 Lyon cedex 07, France.


Sorting of ubiquitinated proteins to multivesicular bodies (MVBs) in mammalian cells relies on proteins with a Vps27/Hrs/STAM (VHS) domain. Here, we show that the amoeba Dictyostelium presents only one protein with a VHS domain: DdTom1. We demonstrate that the VHS domain of DdTom1 is followed by a Golgi-localized, gamma-ear-containing, ADP-ribosylation-factor-binding and Tom1 (GAT) domain that binds ubiquitin, and by a non-conserved C-terminal domain that can recruit clathrin, EGFr pathway substrate 15 and tumor susceptibility gene 101, a component of the MVB biogenesis machinery [endosomal complexes required for transport (ESCRT) complexes]. Both VHS and GAT domains interact with phospholipids and therefore could ensure the recruitment of DdTom1 to endosomal membranes. We propose that DdTom1 participates in an ancestral ESCRT-0 complex implicated in the sorting of ubiquitinated proteins into MVBs.

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