1q69: Difference between revisions
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{{STRUCTURE_1q69| PDB=1q69 | SCENE= }} | {{STRUCTURE_1q69| PDB=1q69 | SCENE= }} | ||
===Solution structure of T-cell surface glycoprotein CD8 alpha chain and Proto-oncogene tyrosine-protein kinase LCK fragments=== | |||
{{ABSTRACT_PUBMED_14500983}} | |||
=== | ==Disease== | ||
[[http://www.uniprot.org/uniprot/CD8A_HUMAN CD8A_HUMAN]] Defects in CD8A are a cause of familial CD8 deficiency (CD8 deficiency) [MIM:[http://omim.org/entry/608957 608957]]. Familial CD8 deficiency is a novel autosomal recessive immunologic defect characterized by absence of CD8+ cells, leading to recurrent bacterial infections. [[http://www.uniprot.org/uniprot/LCK_HUMAN LCK_HUMAN]] Note=A chromosomal aberration involving LCK is found in leukemias. Translocation t(1;7)(p34;q34) with TCRB. | |||
==Function== | |||
[[http://www.uniprot.org/uniprot/CD8A_HUMAN CD8A_HUMAN]] Identifies cytotoxic/suppressor T-cells that interact with MHC class I bearing targets. CD8 is thought to play a role in the process of T-cell mediated killing. CD8 alpha chains binds to class I MHC molecules alpha-3 domains. [[http://www.uniprot.org/uniprot/LCK_HUMAN LCK_HUMAN]] Non-receptor tyrosine-protein kinase that plays an essential role in the selection and maturation of developing T-cells in the thymus and in the function of mature T-cells. Plays a key role in T-cell antigen receptor (TCR)-linked signal transduction pathways. Constitutively associated with the cytoplasmic portions of the CD4 and CD8 surface receptors. Association of the TCR with a peptide antigen-bound MHC complex facilitates the interaction of CD4 and CD8 with MHC class II and class I molecules, respectively, thereby recruiting the associated LCK protein to the vicinity of the TCR/CD3 complex. LCK then phosphorylates tyrosines residues within the immunoreceptor tyrosine-based activation motifs (ITAM) of the cytoplasmic tails of the TCR-gamma chains and CD3 subunits, initiating the TCR/CD3 signaling pathway. Once stimulated, the TCR recruits the tyrosine kinase ZAP70, that becomes phosphorylated and activated by LCK. Following this, a large number of signaling molecules are recruited, ultimately leading to lymphokine production. LCK also contributes to signaling by other receptor molecules. Associates directly with the cytoplasmic tail of CD2, which leads to hyperphosphorylation and activation of LCK. Also plays a role in the IL2 receptor-linked signaling pathway that controls the T-cell proliferative response. Binding of IL2 to its receptor results in increased activity of LCK. Is expressed at all stages of thymocyte development and is required for the regulation of maturation events that are governed by both pre-TCR and mature alpha beta TCR. Phosphorylates other substrates including RUNX3, PTK2B/PYK2, the microtubule-associated protein MAPT, RHOH or TYROBP.<ref>PMID:16339550</ref><ref>PMID:16709819</ref><ref>PMID:20100835</ref><ref>PMID:20028775</ref><ref>PMID:20851766</ref><ref>PMID:21269457</ref> | |||
==About this Structure== | ==About this Structure== | ||
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==Reference== | ==Reference== | ||
<ref group="xtra">PMID:014500983</ref><references group="xtra"/> | <ref group="xtra">PMID:014500983</ref><references group="xtra"/><references/> | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Blacklow, S C.]] | [[Category: Blacklow, S C.]] | ||