Post-translational modifications of recombinant P-selectin glycoprotein ligand-1 required for binding to P- and E-selectin - PubMed (original) (raw)
Comparative Study
. 1996 Feb 9;271(6):3255-64.
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- PMID: 8621728
Free article
Comparative Study
Post-translational modifications of recombinant P-selectin glycoprotein ligand-1 required for binding to P- and E-selectin
F Li et al. J Biol Chem. 1996.
Free article
Abstract
P-selectin glycoprotein ligand-1 (PSGL-1) is a mucin-like ligand for P- and E-selectin on human leukocytes. PSGL-1 requires sialylated, fucosylated O-linked glycans and tyrosine sulfate to bind P-selectin. Less is known about the determinants that PSGL-1 requires to bind E-selectin. To further define the modifications required for PSGL-1 to bind P- and E-selectin, we transfected Chinese hamster ovary (CHO) cells with cDNAs for PSGL-1 and specific glycosyltransferases. CHO cells synthesize only core 1 O-linked glycans (Galbeta1-3GalNAcalpha1-Se r/Thr); they lack core 2 O-linked glycans (Galbeta1-3(Galbeta1-4GlcNAcbeta1-6)GalNAcalpha1 -Ser/Thr) because they do not express the core 2 beta1 6-N-acetylglucosaminyltransferase (C2GnT). CHO cells also lack alpha1 3 fucosyltransferase activity. PSGL-1 expressed on transfected CHO cells bound P- and E-selectin only when it was co-expressed with both C2GnT and an alpha1 3 fucosyltransferase (Fuc-TIII, Fuc-TIV, or Fuc-TVII). Chromatography of beta-eliminated O-linked glycans from PSGL-1 co-expressed with C2GnT confirmed synthesis of core 2 structures. Tyrosine residues on PSGL-1 expressed in CHO cells were shown to be sulfated. Phenylalanine replacement of three tyrosines within a consensus sequence for tyrosine sulfation abolished binding to P-selectin but not to E-selectin. These results demonstrate that PSGL-1 requires core 2 O-linked glycans that are sialylated and fucosylated to bind P- and E-selectin. PSGL-1 also requires tyrosine sulfate to bind P-selectin but not E-selectin.
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