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J Biol Chem, Vol. 274, Issue 37, 26233-26239, September 10, 1999
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From the We used flow cytometry to sort and analyze apical
and basolateral endocytic vesicles from filter-grown Madin-Darby canine kidney (MDCK) cells after membrane internalization of the lipophilic fluorescent probe trimethylamino-diphenylhexatriene. Western blot analysis of sorted fractions showed enrichment of the early endosomal markers transferrin receptor and the small GTPase Rab5. Two-dimensional gel analysis indicated that the apical and basolateral early endosomes differed significantly in their protein composition. We found nine
polypeptides to be specifically enriched in apical or basolateral endocytic vesicles. An apical protein identified by microsequencing was
the adaptor molecule syntenin. This protein contains two PDZ domains
(PSD-95, Dlg, and ZO-1 homology) that bind syndecan and ephrin-B2
cytoplasmic domains. In MDCK cells, transiently overexpressed Myc-tagged syntenin localized to both plasma membrane domains and to an
intracellular vesicular compartment. Syntenin positive vesicles
colocalized with internalized transferrin in the perinuclear region. In
addition, syntenin colocalized in the apical supranuclear region with
Rab5 and Rab11; the latter is a marker for the apical recycling
endosomes in MDCK cells.
Research Institute of Molecular Pathology,
Dr. Bohr Gasse 7, A-1030 Vienna, Austria, ¶ Boehringer
Ingelheim Austria, Dr. Boehringer-Gasse 5-11, A-1121 Vienna, Austria, the
Department of General and
Experimental Pathology, University of Innsbruck, Fritz-Preglstrasse 3, A-6020 Innsbruck, Austria, the ** Lombardi Cancer Center, Georgetown
University Medical Center, Washington, D.C. 20007-2197, and the

Max Planck Institute of Biochemistry,
Am Klopferspitz, D-82152 Martinsried, Germany
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