Probable non-functional T cell receptor beta variable 5-3
1_MGPGL 6_ LCWEL 11_ LYLLG 16_ AGPVE 21_ AGVTQ 26_ SPTHL 31_ IKTRG 36_ QQVTL 41_ RCSPI 46_ SGHSS 51_ VSWYQ 56_ QAPGQ 61_ GPQFI 66_ FEYAN 71_ ELRRS 76_ EGNFP 81_ NRFSG 86_ RQFHD 91_ YCSEM 96_ NVSAL 101_ ELGDS 106_ALYLC
1: Probable non-functional open reading frame (ORF) of V region of the variable domain of T cell receptor (TR) beta chain (PubMed:24600447). Non-functional ORF generally cannot participate in the synthesis of a productive T cell receptor (TR) chain due to altered V-(D)-J or switch recombination and/or splicing site (at mRNA level) and/or conserved amino acid change (protein level) (PubMed:9619395). Alpha-beta T cell receptors are antigen specific receptors which are essential to the immune response and are present on the cell surface of T lymphocytes. Recognize peptide-major histocompatibility (MH) (pMH) complexes that are displayed by antigen presenting cells (APC), a prerequisite for efficient T cell adaptive immunity against pathogens (PubMed:25493333). Binding of alpha-beta TR to pMH complex initiates TR-CD3 clustering on the cell surface and intracellular activation of LCK that phosphorylates the ITAM motifs of CD3G, CD3D, CD3E and CD247 enabling the recruitment of ZAP70. In turn ZAP70 phosphorylates LAT, which recruits numerous signaling molecules to form the LAT signalosome. The LAT signalosome propagates signal branching to three major signaling pathways, the calcium, the mitogen-activated protein kinase (MAPK) kinase and the nuclear factor NF-kappa-B (NF-kB) pathways, leading to the mobilization of transcription factors that are critical for gene expression and essential for T cell growth and differentiation (PubMed:23524462). The T cell repertoire is generated in the thymus, by V-(D)-J rearrangement. This repertoire is then shaped by intrathymic selection events to generate a peripheral T cell pool of self-MH restricted, non-autoaggressive T cells. Post-thymic interaction of alpha-beta TR with the pMH complexes shapes TR structural and functional avidity (PubMed:15040585)