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Vol. 12, Issue 2, 475-485, February 2001


and
*Howard Hughes Medical Institute and Department of Molecular and
Cell Biology, University of California, 229 Stanley Hall, Berkeley,
California 94720-3206; A native immunoisolation procedure has been used to investigate the
role of clathrin-coated vesicles (CCVs) in the transport of vacuolar
proteins between the trans-Golgi network (TGN) and the
prevacuolar/endosome compartments in the yeast Saccharomyces cerevisiae. We find that Apl2p, one large subunit of the
adaptor protein-1 complex, and Vps10p, the carboxypeptidase Y
vacuolar protein receptor, are associated with clathrin molecules.
Vps10p packaging in CCVs is reduced in pep12
Department of Biological
Chemistry, School of Medicine, University of California, Los Angeles,
California 90095; and
Département de Biochimie
Médicale, Centre Médicale Universitaire, Université
de Genève, 1211 Geneva 4, Switzerland
and
vps34
, two mutants that block Vps10p transport from
the TGN to the endosome. However, Vps10p sorting is independent of
Apl2p. Interestingly, a Vps10Ct
p mutant lacking its
C-terminal cytoplasmic domain, the portion of the receptor responsible
for carboxypeptidase Y sorting, is also coimmunoprecipitated with
clathrin. Our results suggest that CCVs mediate Vps10p transport from
the TGN to the endosome independent of direct interactions between
Vps10p and clathrin coats. The Vps10p C-terminal domain appears to play
a principal role in retrieval of Vps10p from the prevacuolar
compartment rather than in sorting from the TGN.
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