UniProtKB - P16004 (CD4_PANTR)
T-cell surface glycoprotein CD4
CD4
Functioni
GO - Molecular functioni
- coreceptor activity Source: InterPro
- interleukin-16 binding Source: Ensembl
- interleukin-16 receptor activity Source: Ensembl
- MHC class II protein binding Source: GO_Central
- protein homodimerization activity Source: Ensembl
- protein tyrosine kinase binding Source: GO_Central
- zinc ion binding Source: Ensembl
GO - Biological processi
- adaptive immune response Source: UniProtKB-KW
- cell adhesion Source: InterPro
- cellular response to granulocyte macrophage colony-stimulating factor stimulus Source: Ensembl
- cytokine production Source: Ensembl
- defense response to Gram-negative bacterium Source: Ensembl
- helper T cell enhancement of adaptive immune response Source: Ensembl
- induction by virus of host cell-cell fusion Source: Ensembl
- interleukin-15-mediated signaling pathway Source: GO_Central
- macrophage differentiation Source: Ensembl
- maintenance of protein location in cell Source: Ensembl
- positive regulation of calcium-mediated signaling Source: Ensembl
- positive regulation of ERK1 and ERK2 cascade Source: GO_Central
- positive regulation of I-kappaB kinase/NF-kappaB signaling Source: Ensembl
- positive regulation of monocyte differentiation Source: Ensembl
- positive regulation of peptidyl-tyrosine phosphorylation Source: Ensembl
- positive regulation of protein kinase activity Source: Ensembl
- positive regulation of T cell activation Source: Ensembl
- positive regulation of transcription, DNA-templated Source: Ensembl
- positive regulation of viral entry into host cell Source: Ensembl
- regulation of calcium ion transport Source: Ensembl
- signal transduction Source: GO_Central
- T cell activation Source: GO_Central
- T cell differentiation Source: UniProtKB
- T cell selection Source: UniProtKB
Keywordsi
Biological process | Adaptive immunity, Immunity |
Names & Taxonomyi
Protein namesi | Recommended name: T-cell surface glycoprotein CD4Alternative name(s): T-cell surface antigen T4/Leu-3 CD_antigen: CD4 |
Gene namesi | Name:CD4 |
Organismi | Pan troglodytes (Chimpanzee) |
Taxonomic identifieri | 9598 [NCBI] |
Taxonomic lineagei | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Pan |
Proteomesi |
|
Organism-specific databases
VGNCi | VGNC:5330, CD4 |
Subcellular locationi
Plasma membrane
- Cell membrane By similarity; Single-pass type I membrane protein By similarity
Note: Localizes to lipid rafts.By similarity
Endoplasmic reticulum
- endoplasmic reticulum lumen Source: Ensembl
- endoplasmic reticulum membrane Source: Ensembl
Plasma Membrane
- external side of plasma membrane Source: GO_Central
- integral component of plasma membrane Source: Ensembl
Other locations
- membrane raft Source: GO_Central
Topology
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Topological domaini | 26 – 396 | ExtracellularSequence analysisAdd BLAST | 371 | |
Transmembranei | 397 – 418 | HelicalSequence analysisAdd BLAST | 22 | |
Topological domaini | 419 – 458 | CytoplasmicSequence analysisAdd BLAST | 40 |
Keywords - Cellular componenti
Cell membrane, MembranePTM / Processingi
Molecule processing
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Signal peptidei | 1 – 25 | By similarityAdd BLAST | 25 | |
ChainiPRO_0000014626 | 26 – 458 | T-cell surface glycoprotein CD4Add BLAST | 433 |
Amino acid modifications
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Disulfide bondi | 41 ↔ 109 | PROSITE-ProRule annotation | ||
Disulfide bondi | 155 ↔ 184 | PROSITE-ProRule annotation | ||
Glycosylationi | 296 | N-linked (GlcNAc...) asparagineBy similarity | 1 | |
Glycosylationi | 325 | N-linked (GlcNAc...) asparagineBy similarity | 1 | |
Disulfide bondi | 328 ↔ 370 | PROSITE-ProRule annotation | ||
Lipidationi | 419 | S-palmitoyl cysteineBy similarity | 1 | |
Lipidationi | 422 | S-palmitoyl cysteineBy similarity | 1 | |
Modified residuei | 433 | PhosphoserineBy similarity | 1 | |
Modified residuei | 440 | PhosphoserineBy similarity | 1 | |
Modified residuei | 456 | PhosphoserineBy similarity | 1 |
Post-translational modificationi
Keywords - PTMi
Disulfide bond, Glycoprotein, Lipoprotein, Palmitate, PhosphoproteinProteomic databases
PaxDbi | P16004 |
Interactioni
Subunit structurei
Forms disulfide-linked homodimers at the cell surface.
Interacts with LCK.
Interacts with PTK2/FAK1. Binds to P4HB/PDI.
Interacts with IL16; this interaction induces a CD4-dependent signaling in lymphocytes.
Interacts (via Ig-like V-type domain) with MHCII alpha chain (via alpha-2 domain) and beta chain (via beta-2 domain); this interaction increases the affinity of TCR for peptide-MHCII. CD4 oligomerization via Ig-like C2-type 2 and 3 domains appears to be required for stable binding to MHCII and adhesion between T cells and APCs.
By similarityGO - Molecular functioni
- interleukin-16 binding Source: Ensembl
- MHC class II protein binding Source: GO_Central
- protein homodimerization activity Source: Ensembl
- protein tyrosine kinase binding Source: GO_Central
Protein-protein interaction databases
STRINGi | 9598.ENSPTRP00000054833 |
Family & Domainsi
Domains and Repeats
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Domaini | 26 – 125 | Ig-like V-typeAdd BLAST | 100 | |
Domaini | 126 – 203 | Ig-like C2-type 1Add BLAST | 78 | |
Domaini | 204 – 317 | Ig-like C2-type 2Add BLAST | 114 | |
Domaini | 318 – 374 | Ig-like C2-type 3Add BLAST | 57 |
Domaini
Keywords - Domaini
Immunoglobulin domain, Repeat, Signal, Transmembrane, Transmembrane helixPhylogenomic databases
eggNOGi | ENOG502S0W5, Eukaryota |
GeneTreei | ENSGT00390000001745 |
InParanoidi | P16004 |
OMAi | KTCQCSH |
OrthoDBi | 652984at2759 |
Family and domain databases
Gene3Di | 2.60.40.10, 4 hits |
InterProi | View protein in InterPro IPR000973, CD4 IPR015274, CD4-extracel IPR007110, Ig-like_dom IPR036179, Ig-like_dom_sf IPR013783, Ig-like_fold IPR008424, Ig_C2-set IPR003599, Ig_sub IPR003598, Ig_sub2 IPR013106, Ig_V-set IPR013151, Immunoglobulin IPR021963, Tcell_CD4_Cterm |
PANTHERi | PTHR11422:SF0, PTHR11422:SF0, 1 hit |
Pfami | View protein in Pfam PF05790, C2-set, 2 hits PF09191, CD4-extracel, 1 hit PF00047, ig, 1 hit PF12104, Tcell_CD4_C, 1 hit |
PRINTSi | PR00692, CD4TCANTIGEN |
SMARTi | View protein in SMART SM00409, IG, 3 hits SM00408, IGc2, 2 hits SM00406, IGv, 1 hit |
SUPFAMi | SSF48726, SSF48726, 4 hits |
PROSITEi | View protein in PROSITE PS50835, IG_LIKE, 1 hit |
(1+)i Sequence
Sequence statusi: Complete.
: The displayed sequence is further processed into a mature form. Sequence processingi
This entry has 1 described isoform and 2 potential isoforms that are computationally mapped.Show allAlign All
10 20 30 40 50
MNRGVPFRHL LLVLQLALLP AATQGKKVVL GKKGDTVELT CTASQKKSIQ
60 70 80 90 100
FHWKNSNQTK ILGNQGSFLT KGPSKLNDRV DSRRSLWDQG NFTLIIKNLK
110 120 130 140 150
IEDSDTYICE VGDQKEEVQL LVFGLTANSD THLLQGQSLT LTLESPPGSS
160 170 180 190 200
PSVQCRSPRG KNIQGGKTLS VSQLELQDSG TWTCTVLQNQ KKVEFKIDIV
210 220 230 240 250
VLAFQKASSI VYKKEGEQVE FSFPLAFTVE KLTGSGELWW QAERASSSKS
260 270 280 290 300
WITFDLKNKE VSVKRVTQDP KLQMGKKLPL HLTLPQALPQ YAGSGNLTLA
310 320 330 340 350
LEAKTGKLHQ EVNLVVMRAT QLQKNLTCEV WGPTSPKLML SLKLENKEAK
360 370 380 390 400
VSKREKAVWV LNPEAGMWQC LLSDSGQVLL ESNIKVLPTW STPVQPMALI
410 420 430 440 450
VLGGVAGLLL FIGLGIFFCV RCRHRRRQAQ RMSQIKRLLS EKKTCQCPHR
FQKTCSPI
Computationally mapped potential isoform sequencesi
There are 2 potential isoforms mapped to this entry.BLASTAlignShow allAdd to basketA0A2I3RUH7 | A0A2I3RUH7_PANTR | T-cell surface glycoprotein CD4 | CD4 | 148 | Annotation score: | ||
A0A2I3SLH1 | A0A2I3SLH1_PANTR | T-cell surface glycoprotein CD4 | CD4 | 268 | Annotation score: |
Experimental Info
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Sequence conflicti | 42 | T → N (PubMed:1425921).Curated | 1 | |
Sequence conflicti | 62 | L → S (PubMed:1425921).Curated | 1 | |
Sequence conflicti | 191 | K → N (PubMed:1425921).Curated | 1 |
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | M31135 mRNA Translation: AAA35407.1 X73323 mRNA Translation: CAA51749.1 |
PIRi | B32722, RWCZT4 |
RefSeqi | NP_001009043.1, NM_001009043.1 XP_016777999.1, XM_016922510.1 XP_016778000.1, XM_016922511.1 |
Genome annotation databases
Ensembli | ENSPTRT00000062277; ENSPTRP00000054833; ENSPTRG00000004590 |
GeneIDi | 450124 |
KEGGi | ptr:450124 |
Similar proteinsi
Cross-referencesi
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | M31135 mRNA Translation: AAA35407.1 X73323 mRNA Translation: CAA51749.1 |
PIRi | B32722, RWCZT4 |
RefSeqi | NP_001009043.1, NM_001009043.1 XP_016777999.1, XM_016922510.1 XP_016778000.1, XM_016922511.1 |
3D structure databases
SMRi | P16004 |
ModBasei | Search... |
Protein-protein interaction databases
STRINGi | 9598.ENSPTRP00000054833 |
Proteomic databases
PaxDbi | P16004 |
Genome annotation databases
Ensembli | ENSPTRT00000062277; ENSPTRP00000054833; ENSPTRG00000004590 |
GeneIDi | 450124 |
KEGGi | ptr:450124 |
Organism-specific databases
CTDi | 920 |
VGNCi | VGNC:5330, CD4 |
Phylogenomic databases
eggNOGi | ENOG502S0W5, Eukaryota |
GeneTreei | ENSGT00390000001745 |
InParanoidi | P16004 |
OMAi | KTCQCSH |
OrthoDBi | 652984at2759 |
Family and domain databases
Gene3Di | 2.60.40.10, 4 hits |
InterProi | View protein in InterPro IPR000973, CD4 IPR015274, CD4-extracel IPR007110, Ig-like_dom IPR036179, Ig-like_dom_sf IPR013783, Ig-like_fold IPR008424, Ig_C2-set IPR003599, Ig_sub IPR003598, Ig_sub2 IPR013106, Ig_V-set IPR013151, Immunoglobulin IPR021963, Tcell_CD4_Cterm |
PANTHERi | PTHR11422:SF0, PTHR11422:SF0, 1 hit |
Pfami | View protein in Pfam PF05790, C2-set, 2 hits PF09191, CD4-extracel, 1 hit PF00047, ig, 1 hit PF12104, Tcell_CD4_C, 1 hit |
PRINTSi | PR00692, CD4TCANTIGEN |
SMARTi | View protein in SMART SM00409, IG, 3 hits SM00408, IGc2, 2 hits SM00406, IGv, 1 hit |
SUPFAMi | SSF48726, SSF48726, 4 hits |
PROSITEi | View protein in PROSITE PS50835, IG_LIKE, 1 hit |
ProtoNeti | Search... |
MobiDBi | Search... |
Entry informationi
Entry namei | CD4_PANTR | |
Accessioni | P16004Primary (citable) accession number: P16004 | |
Entry historyi | Integrated into UniProtKB/Swiss-Prot: | April 1, 1990 |
Last sequence update: | April 1, 1990 | |
Last modified: | February 10, 2021 | |
This is version 142 of the entry and version 1 of the sequence. See complete history. | ||
Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
Annotation program | Chordata Protein Annotation Program |