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. 1983;2(7):1137–1143. doi: 10.1002/j.1460-2075.1983.tb01558.x

In vivo sulfation of the contact site A glycoprotein of Dictyostelium discoideum

J Stadler 1,*, G Gerisch 1, G Bauer 1, C Suchanek 1, WB Huttner 1
PMCID: PMC555247  PMID: 16453468

Abstract

During the development of Dictyostelium discoideum from the growth phase to the aggregation stage, a glycoprotein with an apparent mol. wt. of 80 kd is known to be expressed on the cell surface. This glycoprotein, referred to as contact site A, has been implicated in the formation of species-specific, EDTA-stable contacts of aggregating cells. When developing cells were labeled in vivo with [35S]sulfate, the 80-kd glycoprotein was found to be the most prominently sulfated protein. Another strongly sulfated protein had an apparent mol. wt. of 130 kd and was, like the 80-kd glycoprotein, developmentally regulated and associated with the particulate fraction of the cells. The [35S]sulfate incorporated into the 80-kd and 130-kd proteins was not present as tyrosine-O-sulfate, a modified amino acid found in many proteins of mammalian cells. D. discoideum cells incubated with [35S]sulfate in the presence of tunicamycin, an inhibitor of N-glycosylation, produced a 66-kd protein that reacted with monoclonal antibodies raised against the 80-kd glycoprotein, but no longer contained [35S]sulfate. These results suggest that sulfation of the 80-kd glycoprotein occurred on carbohydrate residues. The possible importance of sulfation for a role of the 80-kd glycoprotein in cell adhesion is discussed.

Keywords: glycoprotein, sulfation, cell adhesion, Dictyostelium

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