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- W2044162092 abstract "Leukocyte rolling in the vasculature is mediated by the interaction of endothelial P-selectin and leukocyte P-selectin glycoprotein ligand 1 (PSGL-1). Since cell−cell interaction mediated by P-selectin and PSGL-1 is cooperative and complex, we have developed a model system to examine the binding of P-selectin to PSGL-1 in a soluble system. Equilibrium binding analyses were performed with truncated forms of soluble human P-selectin and dimeric PSGL-1, both lacking the transmembrane domain and both produced in Chinese hamster ovary (CHO) cells. Soluble PSGL-1 (sPSGL-1), which contains no tryptophan residues and exhibits no intrinsic fluorescence, was harvested from CHO cells cotransfected with either fucosyltransferase III (sPSGL-1/Fuc-TIII) or fucosyltransferase VII (sPSGL-1/Fuc-TVII). Both fucosylation isoforms of sPSGL-1 bound to sP-selectin. The interaction of sP-selectin and sPSGL-1 was studied by monitoring changes in the intrinsic fluorescence of sP-selectin upon binding to sPSGL-1. Binding of sPSGL-1 to sP-selectin in the presence of calcium caused an increase in tryptophan fluorescence that could be reversed by the addition of ethylenediaminetetraacetic acid (EDTA). The fluorescence enhancement of sP-selectin by sPSGL-1 was used to generate binding isotherms, and these data were fitted to a bimolecular binding model. The binding constant, Kd, for the binding of sPSGL-1/Fuc-TIII and sPSGL-1/Fuc-TVII to sP-selectin was 3 ± 2 nM and 80 ± 44 nM, respectively. Monomeric sP-selectin bound to dimeric sPSGL-1 with a 2:1 stoichiometry. In a system in which both protein species are soluble and lack transmembrane domains, these results indicate high-affinity interaction between P-selectin and PSGL-1. Furthermore, the fucosylation pattern of PSGL-1 can affect its affinity for P-selectin. These binding constants can be used to explore models of cell adhesion in flow systems." @default.
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- W2044162092 date "1998-11-01" @default.
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- W2044162092 title "Interaction between Soluble P-Selectin and Soluble P-Selectin Glycoprotein Ligand 1: Equilibrium Binding Analysis" @default.
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- W2044162092 doi "https://doi.org/10.1021/bi981341g" @default.
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