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© The Rockefeller University Press, 0021-9525/1998//665 $5.00
The Journal of Cell Biology, Volume 142, Number 3, , 1998 665-681


Regular Articles

A Membrane Coat Complex Essential for Endosome-to-Golgi Retrograde Transport in Yeast



Matthew N.J. Seaman, J. Michael McCaffery, and Scott D. Emr

Division of Cellular and Molecular Medicine and Howard Hughes Medical Institute, University of California at San Diego, School of Medicine, La Jolla, California 92093–0668

We have recently characterized three yeast gene products (Vps35p, Vps29p, and Vps30p) as candidate components of the sorting machinery required for the endosome-to-Golgi retrieval of the vacuolar protein sorting receptor Vps10p (Seaman, M.N.J., E.G. Marcusson, J.-L. Cereghino, and S.D. Emr. 1997. J. Cell Biol. 137:79–92). By genetic and biochemical means we now show that Vps35p and Vps29p interact and form part of a multimeric membrane-associated complex that also contains Vps26p, Vps17p, and Vps5p. This complex, designated here as the retromer complex, assembles from two distinct subcomplexes comprising (a) Vps35p, Vps29p, and Vps26p; and (b) Vps5p and Vps17p. Density gradient fractionation of Golgi/endosomal/vesicular membranes reveals that Vps35p cofractionates with Vps5p/Vps17p in a vesicle-enriched dense membrane fraction. Furthermore, gel filtration analysis indicates that Vps35p and Vps5p are present on a population of vesicles and tubules slightly larger than COPI/coatomer-coated vesicles. We also show by immunogold EM that Vps5p is localized to discrete regions at the rims of the prevacuolar endosome where vesicles appear to be budding. Size fractionation of cytosolic and recombinant Vps5p reveals that Vps5p can self-assemble in vitro, suggesting that Vps5p may provide the mechanical impetus to drive vesicle formation. Based on these findings we propose a model in which Vps35p/Vps29p/Vps26p function to select cargo for retrieval, and Vps5p/Vps17p assemble onto the membrane to promote vesicle formation. Conservation of the yeast retromer complex components in higher eukaryotes suggests an important general role for this complex in endosome-to-Golgi retrieval.

Key Words: retrieval • endosome • Golgi • vesicle • coat



Abbreviations used in this paper: CPY, carboxypeptidase Y; DPAP A, dipeptidyl amino peptidase A; DTSSP, 3,3'-dithiobis sulfosuccinimidyl-proprionate; GST, glutathione S-transferase; HA, hemagglutinin; M6P, mannose-6-phosphate.

We are very grateful to the Immunoelectron Microscopy Core B (program project grant CA 58689) headed by Marilyn Farquhar for outstanding assistance with the EM. The authors wish to thank Dr. Elizabeth Jones for plasmid p8HA22, and Dr. Steve Nothwehr for plasmid pAH31 and for many valuable discussions. Thanks are also due to members of the Emr lab for critical reading of the manuscript; in particular, Dr. Beverly Wendland, Dr. Markus Babst, Dr. Jon Gary, and Dr. Greg Odorizzi, and also to Dr. Chris Burd for invaluable discussions and Dr. Stephanie Rieder for suggesting the term retromer.

The present address of Matthew N.J. Seaman is Department of Clinical Biochemistry, University of Cambridge, Addenbrookes Hospital, Hills Road, Cambridge, CB2 2QR, United Kingdom.

Address all correspondence to Scott D. Emr, Division of Cellular and Molecular Medicine, Howard Hughes Medical Institute, UCSD School of Medicine, 9500 Gilman Drive, La Jolla, CA 92093-0668. Tel.: 619-534-6462; Fax: 619-534-6414; E-mail: semr{at}ucsd.edu



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