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Did2 coordinates Vps4-mediated dissociation of ESCRT-III from endosomes
Did2 coordinates Vps4-mediated dissociation of ESCRT-III from endosomes.
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The sorting of transmembrane cargo proteins into the lumenal vesicles of multivesicular bodies (MVBs) depends on the recruitment of endosomal sorting complexes required for transport (ESCRTs) to the cytosolic face of endosomal membranes. The subsequent dissociation of ESCRT complexes from endosomes requires Vps4, a member of the AAA family of adenosine triphosphatases. We show that Did2 directs Vps4 activity to the dissociation of ESCRT-III but has no role in the dissociation of ESCRT-I or -II. Surprisingly, vesicle budding into the endosome lumen occurs in the absence of Did2 function even though Did2 is required for the efficient sorting of MVB cargo proteins into lumenal vesicles. This uncoupling of MVB cargo sorting and lumenal vesicle formation suggests that the Vps4-mediated dissociation of ESCRT-III is an essential step in the sorting of cargo proteins into MVB vesicles but is not a prerequisite for the budding of vesicles into the endosome lumen.
Nickerson DP, West M, Odorizzi G
The Journal of cell biology
2006-12-04 00:00
175
5
715-20
Adenosine Triphosphatases,Binding Sites,Carrier Proteins,Endosomes,Models, Biological,Protein Structure, Tertiary,Protein Transport,Saccharomyces cerevisiae Proteins,Transport Vesicles,Carrier Proteins,Saccharomyces cerevisiae Proteins,VPS4 protein, S cerevisiae,Vps46 protein, S cerevisiae,Adenosine Triphosphatases
Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, CO 80309, USA
J. Cell Biol.
NIGMS GM065505, NIGMS GM07135
0021-9525
10.1083/jcb.200606113
jcb.200606113
834
True
17130288
