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J. Cell Biol.,
Volume 145, Number 4, May 17, 1999 899-910


* Department of Anatomy and Program in Immunology, and L-selectin, a lectin-like receptor, mediates
rolling of lymphocytes on high endothelial venules
(HEVs) in secondary lymphoid organs by interacting
with HEV ligands. These ligands consist of a complex of
sialomucins, candidates for which are glycosylation- dependent cell adhesion molecule 1 (GlyCAM-1),
CD34, and podocalyxin. The ligands must be sialylated,
fucosylated, and sulfated for optimal recognition by
L-selectin. Our previous structural characterization of
GlyCAM-1 has demonstrated two sulfation modifications, Gal-6-sulfate and GlcNAc-6-sulfate in the context of sialyl Lewis x. We now report the cloning of a
Gal-6-sulfotransferase and a GlcNAc-6-sulfotransferase, which can modify GlyCAM-1 and CD34. The
Gal-6-sulfotransferase shows a wide tissue distribution.
In contrast, the GlcNAc-6-sulfotransferase is highly restricted to HEVs, as revealed by Northern analysis and
in situ hybridization. Expression of either enzyme in
Chinese hamster ovary cells, along with CD34 and fucosyltransferase VII, results in ligand activity, as detected
by binding of an L-selectin/IgM chimera. When coexpressed, the two sulfotransferases synergize to produce
strongly enhanced chimera binding.
Cardiovascular Research Institute, University of California, San
Francisco, California 94143; § Program in Experimental Pathology, Aichi Cancer Center, Nagoya, Japan;
Clontech Laboratories,
Inc., Palo Alto, California 94303; and ¶ Department of Respiratory Diseases, Roche Bioscience, Palo Alto, California 94304-1397
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