Abstract
We have previously demonstrated hyposialylation of the two major CD45 and leukosialin (CD43) molecules at the surface of latently human immunodeficiency virus type 1-infected CEM T cells (CEMLAI/NP), (Lefebvre, J. C., Giordanengo, V., Doglio, A., Cagnon, L., Breittmayer, J. P., Peyron, J. F., and Lesimple, J. (1994) Virology 199, 265-274; Lefebvre, J. C., Giordanengo, V., Limouse, M., Doglio, A., Cucchiarini, M., Monpoux, F., Mariani, R., and Peyron, J. F. (1994) J. Exp. Med. 180, 1609-1617). Searching to clarify mechanism(s) of hyposialylation, we observed two sulfated secreted glycoproteins (molecular mass approximately 47 and approximately 40 kDa) (P47 and P40), which were differentially sulfated and/or differentially secreted in the culture supernatants of CEMLAI/NP cells when compared with parental CEM cells. A hybridoma clone (7H1) resulting from the fusion between CEMLAI/NP and human embryonic fibroblasts MRC5 cells produced very large amounts of P47 that was purified using Jacalin lectin (specific for O-glycans) and microsequenced. Cloning of P47 was achieved using a CEMLAI/NP cDNA library screened with a degenerate oligonucleotide probe based on its NH2-terminal amino acid sequence. A single open reading frame encoding...Continue Reading
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