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Vol. 13, Issue 12, 4317-4332, December 2002
Membrane Biology Laboratory, Institute of Molecular and Cell
Biology, Singapore 117609, Singapore
We present evidence to suggest the existence of a regulatory
pathway for the Golgi apparatus to modulate the spatial positioning of
otherwise distantly located lysosomes. Rab34, a new member of the Rab
GTPase family, is associated primarily with the Golgi apparatus.
Expression of wild-type or GTP-restricted but not GDP-restricted versions of Rab34 causes spatial redistribution of lysosomes from the
periphery to the peri-Golgi region. The regulation of lysosomal positioning by Rab34 depends on its association with the membrane mediated by prenylation and its direct interaction with Rab-interacting lysosomal protein (RILP). This biological activity, mediated by Rab34-RILP interaction, is dependent on Lys82 in the switch I region.
Our results have uncovered a novel mechanism for the Golgi apparatus to
regulate the spatial distribution of another organelle.
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