Linker for activation of T-cells (LAT) (LAT)

Linker for activation of T-cells (LAT) is a critical integral membrane adaptor protein primarily expressed in T-cells, NK cells, and mast cells. It lacks intrinsic enzymatic activity but serves as a fundamental signaling hub by organizing the 'LAT signalosome' upon phosphorylation by the kinase ZAP-70 following T-cell receptor activation (UniProt: P43441). By recruiting various effector proteins, LAT facilitates the transmission of signals from the cell surface to the nucleus, driving T-cell differentiation, proliferation, and cytokine production (PubMed: 25173748). Due to its central role in immune response, LAT is a significant target for investigating T-cell-mediated pathologies, including autoimmune disorders and certain T-cell malignancies. Genetic mutations or dysregulation of LAT are associated with severe combined immunodeficiency and systemic lupus erythematosus, highlighting its importance in maintaining immune homeostasis (PubMed: 28834471). While direct pharmacological targeting of LAT remains largely in the experimental and preclinical stages, it is considered a high-value node for the development of immunomodulatory therapies designed to fine-tune T-cell sensitivity or disrupt aberrant signaling in allergic and inflammatory diseases (NCBI: PMC4021319).

Other names

Linker for activation of T-cells family member 1LAT136 kDa phospho-proteinpp36

Functions as a central scaffold protein that is phosphorylated by ZAP-70 following T-cell receptor (TCR) stimulation; once phosphorylated, it recruits SH2-domain-containing proteins such as PLC-gamma-1, Grb2, and Gads to initiate downstream signaling cascades including the Ras/MAPK and calcium pathways.