Formulation: Lyophilized from sterile PBS, pH 7.4
Purity: ≥95% as determined by SDS-PAGE
Shelf life (days): 365
Notes: P-selectin glycoprotein ligand 1 (PSGL-1), also known as CD162, is a cell surface glycoprotein encoded by SELPLG in humans that binds to P-, E-, and L-selectins to mediate the rolling and tethering of immune cells on endothelium for migration into sites of inflammation.{67272,67274,67276} It is expressed as a homodimer on myeloid and lymphoid cells, including platelets, and is composed of an extracellular domain, which contains branching sites for glycosylation and sulfation, a transmembrane domain, and a cytoplasmic domain.{67274} PSGL-1 selectin binding requires post-translational modifications, including sulfation and glycosylation, and these modifications are constitutively present on PSGL-1 in innate immune cells and differentiated T cells.{67275} Ectopic expression of PSGL-1 in CD4+ T cells inhibits processing and incorporation of the HIV-1 envelope glycoprotein, disrupting attachment of viral progeny to target cells but does not inhibit HIV-1 infection.{67273} It also inhibits the incorporation of severe acute respiratory syndrome coronavirus (SARS-CoV) and SARS-CoV-2 spike glycoproteins into pseudovirions and blocks pseudovirus attachment and infection of target cells.{67276} Cayman’s PSGL-1 (human, recombinant; His- and Fc-tagged) protein is a disulfide-linked homodimer. The reduced monomer, composed of PSGL-1 (amino acids 18-295) fused to His-tagged human IgG1 Fc at its C-terminus, consists of 526 amino acids, has a calculated molecular weight of 57.1 kDa, and a predicted N-terminus of Leu18 after signal peptide cleavage. As a result of glycosylation, the monomer migrates at approximately 110-120 kDa by SDS-PAGE under reducing conditions.
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