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Rab9 GTPase Regulates Late Endosome Size and Requires Effector Interaction for Its Stability

Ganley, Ian G., Carroll, Kate, Bittova, Lenka, Pfeffer, Suzanne·2004·Molecular Biology of the Cell
DOI 10.1091/mbc.e04-08-0747
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Abstract

Rab9 GTPase resides in a late endosome microdomain together with mannose 6-phosphate receptors (MPRs) and the tail-interacting protein of 47 kDa (TIP47). To explore the importance of Rab9 for microdomain establishment, we depleted the protein from cultured cells. Rab9 depletion decreased late endosome size and reduced the numbers of multilamellar and dense-tubule–containing late endosomes/lysosomes, but not multivesicular endosomes. The remaining late endosomes and lysosomes were more tightly clustered near the nucleus, implicating Rab9 in endosome localization. Cells displayed increased surface MPRs and lysosome-associated membrane protein 1. In addition, cells showed increased MPR synthesis in conjunction with MPR missorting to the lysosome. Surprisingly, Rab9 stability on late endosomes required interaction with TIP47. Rabs are thought of as independent, prenylated entities that reside either on membranes or in cytosol, bound to GDP dissociation inhibitor. These data show that Rab9 stability is strongly influenced by a specific effector interaction. Moreover, Rab9 and the proteins with which it interacts seem critical for the maintenance of specific late endocytic compartments and endosome/lysosome localization.

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Metadata

Authors
Ganley, I. G., Carroll, K., Bittova, L., & Pfeffer, S.
Affiliations
Department of Biochemistry, Stanford University School of Medicine, Stanford, CA 94305-5307
Venue
Molecular Biology of the Cell
Publisher
American Society for Cell Biology (ASCB)
Published
2004-12
Volume
15
Issue
12
Pages
5420-5430
ISSN
  • 1059-1524
  • 1939-4586
DOI
10.1091/mbc.e04-08-0747
Cited by
157
References
1
Language
en

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