T cell receptor and co-stimulatory signaling (WP3282)

Bos taurus

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The activation and translocation of transcription factors NFAT, AP-1 and NF-kappa-B via the co-stimulatory signaling cascade triggered by MHC peptide, B7 proteins and PD-L1. The activation of NFAT involves a Ca2+/calcineurin disruption of a massive RNA-protein complex prior to its translocation into the nucleus and ultimate transcription factor activity.

Authors

Martina Summer-Kutmon , Egon Willighagen , and Eric Weitz

Activity

last edited

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Organisms

Bos taurus

Communities

Annotations

Pathway Ontology

nuclear factor of activated T-cells signaling pathway calcineurin signaling pathway Toll-like receptor signaling pathway

Participants

Label Type Compact URI Comment
PIP2 Metabolite hmdb:HMDB0010059 PIP2 is a membrane lipid.
PIP3 Metabolite hmdb:HMDB0010147 PIP3 is a membrane lipid generated from PIP2 by the enzyme P13K. PIP3 has a PH binding domain that can be recognized by PLC-g, Itk, and Atk.
Ca2+ Metabolite hmdb:HMDB0000464 Calcium ions are second messengers, small-molecule biochemical mediators. Calcium is released from the ER by IP3. It diffuses throughough the cell enabling the signal to activate a variety of taget proteins. A certain calcium ion concentration must be acheived before targets can be activated.
DAG Metabolite hmdb:HMDB0007223 Produced from PIP2 cleaveage by PLC-g. DAG is a membrane protein which can now recruit other signaling molecules to the membrane by serving as a binding target.
IP3 Metabolite hmdb:HMDB0001059 IP3 is generated when PLC-g cleaves PIP2. IP3 is a second messanger that diffuses into the cytosol and binds to IP3 receptors on the ER therey opening calcium channels.
PIP2 Metabolite hmdb:HMDB0010059 PIP2 is a membrane lipid.
LCK GeneProduct ensembl:ENSBTAG00000012695 Cytoplasmic tyrosine kinase - Lck in its inactive state is bound to CD4/CD8 cytoplasmic tail and it's terminal tyrosine is phosphorylated. Dephosphorylation of this amino acid (by tyrosine phosphotase CD45 -- CD4/CD8 binding its ligand) causes a conformations change in LcK and it becomes an active tyrosine kinase. LcK is activated when the extracellular part of CD8 binds its (MHC:peptide) ligand. Lck is a Src family kinase that is constitutively expressed. It phosphorylates all TCR ITAMS. Rephosphorylation of this carboxyl-terminal tyrosine by Csk returns Lck to the inactive state. Basically, Lck is bound to CD8. When CD8 binds MHC:peptide, Lck gets activated and can phosphorylate nearby ITAMs.
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:3932
ZAP70 GeneProduct ensembl:ENSBTAG00000005892 ZAP-70 is kinase that becomes activated after phosphorylation. It contains to tandem SH2 domains that bind to phosphorylated ITAMs on the TCR complex cytoplasmic tails. It docks at the TCR (requires both ITAM positions to be phosphorylated), is then phosphorylated by Lck, and then recruits other signaling proteins.
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:7535
PLCG1 GeneProduct ensembl:ENSBTAG00000017584 PLC-g is a phospholipase, a class of enzymes that cleave phospholipids just before the phosphate group. PLC-g is initially brought to the plasma membrane by binding of its PH domain to membrane lipid PIP3. PLC-g then binds to LAT and SLP-76 and can be activated by Itk mediated phosphorylation. PLC-g ultimately produces 3 different second messangers to activate 3 paths leading to different TFs that lead to IL-2 transcription
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:5335
AKT1 GeneProduct ensembl:ENSBTAG00000017636 Akt is a serine/threonine-specific protein kinase that plays a key role in many cellular processes such as glucose metabolism, apoptosis, cell proliferation, transcription, and cell migration. Akt is recruited to the membrane by PIP3. Here Akt can be activated / phosphorylated (indirectly) by P13K and can then phosphorylate a variety of downstream pathways. Noteably, Akt promotes cell survival by inhibiting the cell death pathway and stimulates cell metabolism by increasing the utilization of glucose.
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:207
PRKCA GeneProduct ensembl:ENSBTAG00000001061 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:5578
PTPN6 GeneProduct ensembl:ENSBTAG00000020294 SHP-1/2 are tyrosine phosphatases. Here, SHP removes phosphates from PIP3 reverting it back to PIP2. (reverses the work of tyrosine kinase P13K) SHP is recruited to the PD-1 cytoplasmic tail when PD-1 ITIMs are phosphorylated.
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:5777
NFKB1 GeneProduct ensembl:ENSBTAG00000020270 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:4790
RASA1 GeneProduct ensembl:ENSBTAG00000009565 Ras-GAP rapidly downregulates the activity of Ras by converting its bound GTP to GDP
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:5921
RASGRP1 GeneProduct ensembl:ENSBTAG00000021872 RasGRP binds to DAG in the membrane where it can activate Ras
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:10125
IL2 GeneProduct ensembl:ENSBTAG00000020883 All three TFs (NFAT, AP-1, and NFkB) a needed to initiate IL-2 transcription.
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:3558
PPP3CA GeneProduct ensembl:ENSBTAG00000016005 Calcineurin is a protein phosphatase that acts on NFAT.
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:5530
PDK1 GeneProduct ensembl:ENSBTAG00000016836 Phosphoinositide-dependent kinase-1: recruited to the membrane by docking at PIP3 and phosphorylates/activates Akt
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:5163
CSNK1A1 GeneProduct ensembl:ENSBTAG00000005326 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:1452
GSK3A GeneProduct ensembl:ENSBTAG00000020756 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:2931
GSK3B GeneProduct ensembl:ENSBTAG00000048057 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:2932
DYRK1A GeneProduct ensembl:ENSBTAG00000001771 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:1859
DYRK2 GeneProduct ensembl:ENSBTAG00000007256 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:8445
NRON GeneProduct ensembl:ENSBTAG00000044315 NRON is a long non-coding RNA
Homology Mapping from Homo sapiens to Bos taurus: Original ID = En:ENSG00000253079
FYN GeneProduct ensembl:ENSBTAG00000011851 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:2534
CD8A GeneProduct ensembl:ENSBTAG00000021141 CD8 co-receptor - alpha subunit
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:925
CD8B GeneProduct ensembl:ENSBTAG00000008956 CD8 co-receptor - beta subunit
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:926
CD28 GeneProduct ensembl:ENSBTAG00000007445 CD28 is a co-stimulatory surface receptor. It bind B7-1 and B7-2. After CD28 binds its ligand, it is phosphorylated by Lck. The effect of this phosphorylation activates P13K to generate PIP3 which recruits Itk to the cell membrane where Lck can phosphorylate it. Then Itk-P can recruit PLC-g
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:940
CTLA4 GeneProduct ensembl:ENSBTAG00000013170 Expression is enhanced by IL-2. Function is controlled largely by regulation of its surface expression. Initially CTLA-4 is in the intracellular membrane but moves to the cell surface after T-cell receptor signaling. When CTLA-4 cytoplasmic tail is NOT phosphorylated it binds to AP-2 (clathrin adapter molecule) and is removed from the surface. When the tail is phosphorylated AP-2 cannot bind and CTLA-4 is expressed on the surface. CTLA-4 competes with CD28 for B7 ligand, and it has a higher affinity of B7 in part because CTLA-4 binds B7 in a dimer. CTLA-4 interfers with the formation of lipid rafts, TCR:ZAP70 microclusters, and central supramolecular activation complex.
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:1493
PDCD1 GeneProduct ensembl:ENSBTAG00000011543 PD-1 is repressed by pro-inflammatry cytokines. It's ligand, PD-L1, is constitutively expressed on T-cells. PD-1 contains a ITIM (immunoreceptor tyrosine-based inhibitory motif) in its cytoplasmic tail. When this ITIM is phosphorylated, it recruits either of 2 inhibitory phosphatases called SHP
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:5133
ITK Protein ensembl:ENSBTAG00000000306 Itk is a membrane associated tryosine kinase. It binds to phosphorylated LAT and SLP-76 scafflods. From here is activates PLC-g by phosphorylation
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:3702
NFATC2 Protein ensembl:ENSBTAG00000018270 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:4773
NFKBIA Protein ensembl:ENSBTAG00000016683 IkB is an inhibitory protein which when bound to NFkB holds it in an inactive state.
Homology Mapping from Homo sapiens to Bos taurus: Original ID = S:P25963
PTEN Protein ensembl:ENSBTAG00000009498 Phosphatase and tensin homolog - PTEN is constitutively expressed and is a PIP3 phosphatase.
Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:5728
NFATC2 Protein ensembl:ENSBTAG00000018270 Homology Mapping from Homo sapiens to Bos taurus: Original ID = L:4773

References

  1. Orai1-NFAT signalling pathway triggered by T cell receptor stimulation. Srikanth S, Gwack Y. Mol Cells. 2013 Mar;35(3):182–94. PubMed Europe PMC Scholia
  2. Long noncoding RNA in liver diseases. Takahashi K, Yan I, Haga H, Patel T. Hepatology. 2014 Aug;60(2):744–53. PubMed Europe PMC Scholia