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Product Info

ELISA 1:10000, IF/ICC 1:200-1:1000
*The optimal dilutions should be determined by the end user.

WB: For western blot detection of denatured protein samples. IHC: For immunohistochemical detection of paraffin sections (IHC-p) or frozen sections (IHC-f) of tissue samples. IF/ICC: For immunofluorescence detection of cell samples. ELISA(peptide): For ELISA detection of antigenic peptide.

Monoclonal [AFB1533]
CD3 epsilon antibody detects endogenous levels of CD3 epsilon.
Cite Format: Affinity Biosciences Cat# BF0520, RRID:AB_2833558.
Mouse IgG1 in phosphate buffered saline (without Mg2+ and Ca2+), pH 7.4, 150mM NaCl, 0.02% sodium azide and 50% glycerol. Store at -20 °C. Stable for 12 months from date of receipt.


CD3 epsilon; CD3e; CD3e antigen epsilon polypeptide (TiT3 complex); CD3E antigen epsilon polypeptide; CD3E antigen, epsilon subunit; CD3e molecule epsilon; CD3e molecule, epsilon (CD3 TCR complex); CD3e molecule, epsilon (CD3-TCR complex); CD3E_HUMAN; IMD18; T cell antigen receptor complex epsilon subunit of T3; T cell surface antigen T3/Leu 4 epsilon chain; T cell surface glycoprotein CD3 epsilon chain; T-cell surface antigen T3/Leu-4 epsilon chain; T-cell surface glycoprotein CD3 epsilon chain; T3E; TCRE;



Purified recombinant fragment of human CD3 epsilon expressed in E. Coli.

CD3 is a component of T cell surface receptor (TCR), it cantains 5 invariable chains: gamma- , delta-, epsilon-, and zeta/eta。Clevers et al. (1988) showed the TCR/CD3 complex consists of either a TCR alpha/beta or TCR gamma/delta heterodimer coexpressed at the cell surface with the invariant subunits,CD3 is responsible for the signal transduction of the TCR.

PTMs - P07766 As Substrate

Site PTM Type Enzyme
K64 Ubiquitination
K73 Ubiquitination
S77 Phosphorylation
S83 Phosphorylation
K85 Ubiquitination
K104 Ubiquitination
K177 Ubiquitination
Y188 Phosphorylation P06239 (LCK) , P06241 (FYN)
Y199 Phosphorylation P06241 (FYN) , P06239 (LCK)
S200 Phosphorylation

Research Backgrounds


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 of this role of signal transduction in T-cell activation, CD3E plays an essential role in correct T-cell development. Initiates the TCR-CD3 complex assembly by forming the two heterodimers CD3D/CD3E and CD3G/CD3E. Participates also in internalization and cell surface down-regulation of TCR-CD3 complexes via endocytosis sequences present in CD3E cytosolic region.


Phosphorylated on Tyr residues after T-cell receptor triggering by LCK in association with CD4/CD8.

Subcellular Location:

Cell membrane>Single-pass type I membrane protein.

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionSubcellular location
Subunit Structure:

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. Interacts with CD6. Interacts with NCK1. Interacts with NUMB; this interaction is important for TCR-CD3 internalization and subsequent degradation.

Research Fields

· Human Diseases > Infectious diseases: Parasitic > Chagas disease (American trypanosomiasis).

· Human Diseases > Infectious diseases: Viral > Measles.

· Human Diseases > Infectious diseases: Viral > HTLV-I infection.

· Human Diseases > Immune diseases > Primary immunodeficiency.

· Organismal Systems > Immune system > Hematopoietic cell lineage.   (View pathway)

· Organismal Systems > Immune system > Th1 and Th2 cell differentiation.   (View pathway)

· Organismal Systems > Immune system > Th17 cell differentiation.   (View pathway)

· Organismal Systems > Immune system > T cell receptor signaling pathway.   (View pathway)


1). Polysaccharides from Chinese Herbal Lycium barbarum Induced Systemic and Local Immune Responses in H22 Tumor-Bearing Mice. Journal of Immunology Research (PubMed: 29967800) [IF=4.1]

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