JAML1 Antibody - #DF2551

Transmembrane protein of the plasma membrane of leukocytes that control their migration and activation through interaction with CXADR, a plasma membrane receptor found on adjacent epithelial and endothelial cells. The interaction between both receptors mediates the activation of gamma-delta T-cells, a subpopulation of T-cells residing in epithelia and involved in tissue homeostasis and repair. Upon epithelial CXADR-binding, JAML induces downstream cell signaling events in gamma-delta T-cells through PI3-kinase and MAP kinases. It results in proliferation and production of cytokines and growth factors by T-cells that in turn stimulate epithelial tissues repair. It also controls the transmigration of leukocytes within epithelial and endothelial tissues through adhesive interactions with epithelial and endothelial CXADR.

Cell membrane>Single-pass type I membrane protein. Cell junction.
Note: Localized at the plasma membrane and enriched in areas of cell-cell contacts (PubMed:12869515).

Expression is restricted to the hematopoietic tissues with the exception of liver. Expressed in fetal liver, spleen and thymus. Preferentially expressed by mature leukocytes (at protein level).

Homodimer; active form in leukocyte-endothelial cell adhesion. Interacts (homodimeric form) with CXADR. Interacts (via cytoplasmic domain) with the PI3 kinase; upon CXADR-binding. Interacts with ITGA4 and ITGB1; integrin alpha-4/beta-1 may regulate leukocyte to endothelial cells adhesion by controlling JAML homodimerization.

The Ig-like V-type domain 1 mediates interaction with CXADR (By similarity). The Ig-like V-type domain 2 may also play a role in the interaction (PubMed:15800062).

Belongs to the immunoglobulin superfamily.