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J. Biol. Chem., Vol. 276, Issue 10, 7069-7078, March 9, 2001
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From the Department of Pharmacology and of Cell and Molecular
Physiology, Bowles Center for Alcohol Studies, School of Medicine,
University of North Carolina, Chapel Hill, North Carolina 27599
Hepatocyte growth factor-regulated tyrosine
kinase substrate (Hrs) is a mammalian homologue of yeast vacuolar
protein sorting (Vps) protein Vps27p; however, the role of Hrs in
lysosomal trafficking is unclear. Here, we report that Hrs interacts
with sorting nexin 1 (SNX1), a recently identified mammalian homologue
of yeast Vps5p that recognizes the lysosomal targeting code of
epidermal growth factor receptor (EGFR) and participates in lysosomal
trafficking of the receptor. Biochemical analyses demonstrate that Hrs
and SNX1 are ubiquitous proteins that exist in both cytosolic and membrane-associated pools, and that the association of Hrs and SNX
occurs on cellular membranes but not in the cytosol. Furthermore, endogenous SNX1 and Hrs form a ~550-kDa complex that excludes EGFR.
Immunofluorescence and subcellular fractionation studies show that Hrs
and SNX1 colocalize on early endosomes. By using deletion analysis, we
have mapped the binding domains of Hrs and SNX1 that mediate their
association. Overexpression of Hrs or its SNX1-binding domain inhibits
ligand-induced degradation of EGFR, but does not affect either
constitutive or ligand-induced receptor-mediated endocytosis. These
results suggest that Hrs may regulate lysosomal trafficking through its
interaction with SNX1.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AF218916.
Hrs Interacts with Sorting Nexin 1 and Regulates Degradation of
Epidermal Growth Factor Receptor*
*
This work was supported by a grant from the University of
North Carolina Research Council (to L.-S. C.) and by Grant NS37939 from the National Institutes of Health (to L. L.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed: Dept. of Pharmacology,
Rm. 1025A Thurston-Bowles, University of North Carolina, Chapel Hill,
NC 27599-7178. Tel.: 919-966-0503; Fax: 919-966-5679; E-mail:
LianLi@med.unc.edu.
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