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SELPLG

This gene encodes a glycoprotein that functions as a high affinity counter-receptor for the cell adhesion molecules P-, E- and L- selectin expressed on myeloid cells and stimulated T lymphocytes. As such, this protein plays a critical role in leukocyte trafficking during inflammation by tethering of leukocytes to activated platelets or endothelia expressing selectins. This protein requires two post-translational modifications, tyrosine sulfation and the addition of the sialyl Lewis x tetrasaccharide (sLex) to its O-linked glycans, for its high-affinity binding activity. Aberrant expression of this gene and polymorphisms in this gene are associated with defects in the innate and adaptive immune response. Alternate splicing results in multiple transcript variants.
Protein class

Candidate cardiovascular disease genes, CD markers, Plasma proteins

Predicted location

Membrane

Single cell type specificity

Cell type enhanced (dendritic cells, NK-cells, monocytes, Kupffer cells, T-cells, Plasma cells, Macrophages)

Immune cell specificity

Low immune cell specificity

Cell line specificity

Cell line enhanced (HDLM-2, HMC-1, JURKAT, Karpas-707, RPMI-8226, U-266/70, U-266/84)

Interaction

Homodimer; disulfide-linked. Interaction with P-, E- and L-selectins, through their lectin/EGF domains, is required for promoting recruitment and rolling of leukocytes. These interactions require sialyl Lewis X glycan modification but there is a differing dependence for tyrosine sulfations. Sulfation on Tyr-51 of PSGL1 is most important for high affinity L-selectin/SELL binding while P-selectin/SELP requires sulfation on Tyr-48. E-selectin/SELE binds with much lower affinity and requires the sLe(x) epitope, but apparently not tyrosine sulfation. Dimerization appears not to be required for P-selectin/SELP binding. Interacts with SNX20. Interacts with MSN and SYK; mediates the activation of SYK by SELPLG. Interacts with HAVCR1 (PubMed:24703780). (Microbial infection) Interacts with enterovirus 71 capsid proteins. (Microbial infection) Interacts with Staphylococcus aureus proteins SSL5 and SSL11; these interactions prevent SELPLG-mediated neutrophil rolling.

Molecular function

Host cell receptor for virus entry, Receptor

More Types Infomation

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