BTLA

This gene encodes a member of the immunoglobulin superfamily. The encoded protein contains a single immunoglobulin (Ig) domain and is a receptor that relays inhibitory signals to suppress the immune response. Alternative splicing results in multiple transcript variants. Polymorphisms in this gene have been associated with an increased risk of rheumatoid arthritis. [provided by RefSeq, Aug 2011]

B And T Lymphocyte Associated

Inhibitory receptor on lymphocytes that negatively regulates antigen receptor signaling via PTPN6/SHP-1 and PTPN11/SHP-2 (PubMed:12796776, PubMed:14652006, PubMed:15568026, PubMed:18193050).
May interact in cis (on the same cell) or in trans (on other cells) with TNFRSF14 (PubMed:19915044).
In cis interactions, appears to play an immune regulatory role inhibiting in trans interactions in naive T cells to maintain a resting state. In trans interactions, can predominate during adaptive immune response to provide survival signals to effector T cells (PubMed:19915044).

Adaptive immune response Source: UniProtKB-KW
Immune response-regulating cell surface receptor signaling pathway Source: GO_Central
T cell costimulation Source: Reactome

Cell membrane

Extracellular: 31-157 aa
Helical: 158-178 aa
Cytoplasmic: 179-289 aa

Phosphorylated on Tyr residues by TNFRSF14 and by antigen receptors cross-linking, both inducing association with PTPN6 and PTPN11.1 Publication
N-glycosylated.