Endosome-associated complex, ESCRT-II, recruits transport machinery for protein sorting at the multivesicular body.
Sorting of ubiquitinated endosomal membrane proteins into the MVB pathway is executed by the class E Vps protein complexes ESCRT-I, -II, and -III, and the AAA-type ATPase Vps4. This study characterizes ESCRT-II, a soluble approximately 155 kDa protein complex formed by the class E Vps proteins Vps22, Vps25, and Vps36. This protein complex transiently associates with the endosomal membrane and thereby initiates the formation of ESCRT-III, a membrane-associated protein complex that functions immediately downstream of ESCRT-II during sorting of MVB cargo. ESCRT-II in turn functions downstream of ESCRT-I, a protein complex that binds to ubiquitinated endosomal cargo. We propose that the ESCRT complexes perform a coordinated cascade of events to select and sort MVB cargoes for delivery to the lumen of the vacuole/lysosome.
Babst
Markus
M
Department of Cellular and Molecular Medicine and Howard Hughes Medical Institute, School of Medicine, University of California, San Diego, La Jolla 92093, USA.
Katzmann
David J
DJ
Snyder
William B
WB
Wendland
Beverly
B
Emr
Scott D
SD
D002352:Carrier Proteins / Q000378:metabolism* / Q000648:ultrastructure; D002462:Cell Membrane / Q000378:metabolism* / Q000648:ultrastructure; D011992:Endosomes / Q000378:metabolism* / Q000648:ultrastructure; D005057:Eukaryotic Cells / Q000378:metabolism* / Q000648:ultrastructure; D005656:Fungal Proteins / Q000378:metabolism* / Q000648:ultrastructure; D008247:Lysosomes / Q000378:metabolism / Q000648:ultrastructure; D046911:Macromolecular Substances; D008565:Membrane Proteins / Q000235:genetics / Q000302:isolation & purification; D011485:Protein Binding / Q000235:genetics; D021381:Protein Transport / Q000502:physiology*; D012441:Saccharomyces cerevisiae; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000302:isolation & purification; D022161:Transport Vesicles / Q000378:metabolism* / Q000648:ultrastructure; D025801:Ubiquitin / Q000235:genetics / Q000378:metabolism
D002352:Carrier Proteins; D005656:Fungal Proteins; D046911:Macromolecular Substances; D008565:Membrane Proteins; D029701:Saccharomyces cerevisiae Proteins; D025801:Ubiquitin