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J Biol Chem, Vol. 274, Issue 50, 35596-35600, December 10, 1999
From the Department of Molecular and Cell Biology, Boston
University Goldman School of Dental Medicine,
Boston, Massachusetts 02118
Glycosylation of glycoproteins, proteoglycans,
and glycolipids occurring in the Golgi apparatus requires the
translocation of nucleotide sugars from the cytosol into the lumen of
the Golgi. Translocation is mediated by specific nucleotide sugar
transporters, integral Golgi membrane proteins that regulate the above
glycosylation reactions. A defect in GDP-fucose transport into the
lumen of the Golgi apparatus has been recently identified in a patient affected by leukocyte adhesion deficiency type II syndrome (Lubke, T.,
Marquardt, T., von Figura, K., and Korner, C. (1999) J. Biol. Chem. 274, 25986-25989). We have now identified and
purified the rat liver Golgi membrane GDP-fucose transporter, a protein
with an apparent molecular mass of 39 kDa, by a combination of column chromatography, native functional size determination on a glycerol gradient, and photoaffinity labeling with
8-azidoguanosine-5'-[
Reconstitution, Identification, and Purification of the Rat Liver
Golgi Membrane GDP-fucose Transporter*
and
-32P] triphosphate, an analog
of GDP-fucose. The purified transporter appears to exist as a homodimer
within the Golgi membrane. When reconstituted into phosphatidylcholine
liposomes, it was active in GDP-fucose transport and was specifically
photolabeled with 8-azidoguanosine-5'-[
-32P]triphosphate. Transport
was also stimulated 2-3-fold after preloading proteoliposomes with
GMP, the putative antiporter.
*
This work was supported by National Institutes of Health
Grant GM30365 (to C. B. H.).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.
Supported by a Human Frontier Science Program Organization Long
Term Fellowship.
§
To whom correspondence should be addressed: Dept. of Molecular and
Cell Biology, Boston University Goldman School of Dental Medicine, 715 Albany St. (W-200), Boston, MA 02118-2392. Tel.: 617-414-1050; Fax:
617-414-1041; E-mail: chirschb@bu.edu.
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