UniProtKB - Q95LI7 (CD3G_MACFA)
Protein
T-cell surface glycoprotein CD3 gamma chain
Gene
CD3G
Organism
Macaca fascicularis (Crab-eating macaque) (Cynomolgus monkey)
Status
Functioni
Part of the TCR-CD3 complex present on T-lymphocyte cell surface that plays an essential role in adaptive immune response. When antigen presenting cells (APCs) activate T-cell receptor (TCR), TCR-mediated signals are transmitted across the cell membrane by the CD3 chains CD3D, CD3E, CD3G and CD3Z. All CD3 chains contain immunoreceptor tyrosine-based activation motifs (ITAMs) in their cytoplasmic domain. Upon TCR engagement, these motifs become phosphorylated by Src family protein tyrosine kinases LCK and FYN, resulting in the activation of downstream signaling pathways. In addition to this role of signal transduction in T-cell activation, CD3G plays an essential role in the dynamic regulation of TCR expression at the cell surface. Indeed, constitutive TCR cycling is dependent on the di-leucine-based (diL) receptor-sorting motif present in CD3G.By similarity
GO - Molecular functioni
- protein heterodimerization activity Source: UniProtKB
- transmembrane signaling receptor activity Source: UniProtKB
GO - Biological processi
- adaptive immune response Source: UniProtKB-KW
- cell surface receptor signaling pathway Source: UniProtKB
- establishment or maintenance of cell polarity Source: UniProtKB
- protein transport Source: UniProtKB
- regulation of lymphocyte apoptotic process Source: UniProtKB
Keywordsi
Molecular function | Receptor |
Biological process | Adaptive immunity, Immunity |
Names & Taxonomyi
Protein namesi | Recommended name: T-cell surface glycoprotein CD3 gamma chainAlternative name(s): T-cell receptor T3 gamma chain CD_antigen: CD3g |
Gene namesi | Name:CD3G |
Organismi | Macaca fascicularis (Crab-eating macaque) (Cynomolgus monkey) |
Taxonomic identifieri | 9541 [NCBI] |
Taxonomic lineagei | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Cercopithecidae › Cercopithecinae › Macaca |
Proteomesi |
|
Subcellular locationi
Plasma membrane
- Cell membrane By similarity; Single-pass type I membrane protein By similarity
Plasma Membrane
- plasma membrane Source: UniProtKB-SubCell
Other locations
- integral component of membrane Source: UniProtKB-KW
Topology
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Topological domaini | 23 – 113 | ExtracellularSequence analysisAdd BLAST | 91 | |
Transmembranei | 114 – 134 | HelicalSequence analysisAdd BLAST | 21 | |
Topological domaini | 135 – 181 | CytoplasmicSequence analysisAdd BLAST | 47 |
Keywords - Cellular componenti
Cell membrane, MembranePTM / Processingi
Molecule processing
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Signal peptidei | 1 – 22 | By similarityAdd BLAST | 22 | |
ChainiPRO_0000014616 | 23 – 181 | T-cell surface glycoprotein CD3 gamma chainAdd BLAST | 159 |
Amino acid modifications
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Disulfide bondi | 45 ↔ 86 | By similarity | ||
Glycosylationi | 51 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Modified residuei | 144 | PhosphoserineBy similarity | 1 | |
Modified residuei | 147 | Phosphoserine; by PKCBy similarity | 1 |
Post-translational modificationi
Phosphorylated on Tyr residues after T-cell receptor triggering by LCK in association with CD4/CD8. Phosphorylated also by PKC; leading to the TCR complex down-regulation.By similarity
Phosphorylated on Tyr residues after T-cell receptor triggering by LCK in association with CD4/CD8.By similarity
Keywords - PTMi
Disulfide bond, Glycoprotein, PhosphoproteinInteractioni
Subunit structurei
The TCR-CD3 complex is composed of a CD3D/CD3E and a CD3G/CD3E heterodimers that preferentially associate with TCRalpha and TCRbeta, respectively, to form TCRalpha/CD3E/CD3G and TCRbeta/CD3G/CD3E trimers. In turn, the hexamer interacts with CD3Z homodimer to form the TCR-CD3 complex. Alternatively, TCRalpha and TCRbeta can be replaced by TCRgamma and TCRdelta.
By similarityGO - Molecular functioni
- protein heterodimerization activity Source: UniProtKB
Protein-protein interaction databases
STRINGi | 9541.XP_005579857.1 |
Family & Domainsi
Domains and Repeats
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Domaini | 24 – 97 | Ig-likeAdd BLAST | 74 | |
Domaini | 148 – 176 | ITAMPROSITE-ProRule annotationAdd BLAST | 29 |
Motif
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Motifi | 152 – 153 | Di-leucine motifBy similarity | 2 |
Domaini
A di-leucine motif and a tyrosine-based motif are individually sufficient to induce both endocytosis and delivery to lysosomes.By similarity
Keywords - Domaini
Immunoglobulin domain, Signal, Transmembrane, Transmembrane helixPhylogenomic databases
eggNOGi | ENOG502S4XC, Eukaryota |
Family and domain databases
Gene3Di | 2.60.40.10, 1 hit |
InterProi | View protein in InterPro IPR015484, CD3_esu/gsu/dsu IPR036179, Ig-like_dom_sf IPR013783, Ig-like_fold IPR032052, Ig_4 IPR003598, Ig_sub2 IPR003110, Phos_immunorcpt_sig_ITAM |
PANTHERi | PTHR10570, PTHR10570, 1 hit |
Pfami | View protein in Pfam PF16680, Ig_4, 1 hit PF02189, ITAM, 1 hit |
SMARTi | View protein in SMART SM00408, IGc2, 1 hit SM00077, ITAM, 1 hit |
SUPFAMi | SSF48726, SSF48726, 1 hit |
PROSITEi | View protein in PROSITE PS51055, ITAM_1, 1 hit |
i Sequence
Sequence statusi: Complete.
: The displayed sequence is further processed into a mature form. Sequence processingi
Q95LI7-1 [UniParc]FASTAAdd to basket
10 20 30 40 50
MVQGKGLTGF ILAIILLQGS LAQSFEENRK LNVYNQEDGS VLLTCHVKNT
60 70 80 90 100
NITWFKEGKM IDILTAHKNK WNLGSNTKDP RGVYQCKGSK DKSKTLQVYY
110 120 130 140 150
RMCQNCIELN AATILGFVFA EIISIFFLAV GVYFIAGQDG VRQSRASDKQ
160 170 180
TLLPNDQLYQ PLKDREDDQY SHLQGNQLRM N
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | AB073992 mRNA Translation: BAB71848.1 |
RefSeqi | NP_001270839.1, NM_001283910.1 |
Genome annotation databases
GeneIDi | 102134381 |
KEGGi | mcf:102134381 |
Similar proteinsi
Cross-referencesi
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | AB073992 mRNA Translation: BAB71848.1 |
RefSeqi | NP_001270839.1, NM_001283910.1 |
3D structure databases
BMRBi | Q95LI7 |
SMRi | Q95LI7 |
ModBasei | Search... |
Protein-protein interaction databases
STRINGi | 9541.XP_005579857.1 |
Genome annotation databases
GeneIDi | 102134381 |
KEGGi | mcf:102134381 |
Organism-specific databases
CTDi | 917 |
Phylogenomic databases
eggNOGi | ENOG502S4XC, Eukaryota |
Family and domain databases
Gene3Di | 2.60.40.10, 1 hit |
InterProi | View protein in InterPro IPR015484, CD3_esu/gsu/dsu IPR036179, Ig-like_dom_sf IPR013783, Ig-like_fold IPR032052, Ig_4 IPR003598, Ig_sub2 IPR003110, Phos_immunorcpt_sig_ITAM |
PANTHERi | PTHR10570, PTHR10570, 1 hit |
Pfami | View protein in Pfam PF16680, Ig_4, 1 hit PF02189, ITAM, 1 hit |
SMARTi | View protein in SMART SM00408, IGc2, 1 hit SM00077, ITAM, 1 hit |
SUPFAMi | SSF48726, SSF48726, 1 hit |
PROSITEi | View protein in PROSITE PS51055, ITAM_1, 1 hit |
ProtoNeti | Search... |
MobiDBi | Search... |
Entry informationi
Entry namei | CD3G_MACFA | |
Accessioni | Q95LI7Primary (citable) accession number: Q95LI7 | |
Entry historyi | Integrated into UniProtKB/Swiss-Prot: | May 23, 2003 |
Last sequence update: | December 1, 2001 | |
Last modified: | December 2, 2020 | |
This is version 89 of the entry and version 1 of the sequence. See complete history. | ||
Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
Annotation program | Chordata Protein Annotation Program |