Probable non-functional T cell receptor beta variable 23-1
1_MGTRL 6_ LGCAA 11_ LCLLA 16_ ADSFH 21_ AKVTQ 26_ TPGHL 31_ VKGKG 36_ QKTKM 41_ DCTPE 46_ KGHTF 51_ VYWYQ 56_ QNQNK 61_ EFMLL 66_ ISFQN 71_ EQVLQ 76_ ETEMH 81_ KKRFS 86_ SQCPK 91_ NAPCS 96_ LAILS 101_ SEPGD 106_TALYL
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)