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  5. CD8A-CD8B Heterodimer Protein, Mouse (HEK293, Flag-His)

CD8A-CD8B Heterodimer Protein, Mouse (HEK293, Flag-His)

Cat. No.: HY-P74259
COA Handling Instructions

The CD8A, a vital immune glycoprotein, acts as a coreceptor for MHC class I:peptide complexes, connecting T-cells to antigens presented by APCs. Its interaction with TCR and MHC class I recruits LCK kinase, initiating diverse signaling pathways. This mechanism enables CTLs to recognize and eliminate infected and tumor cells. In NK-cells, CD8A homodimers provide a survival mechanism for conjugation and lysis of target cells, contributing to lymphocyte survival and differentiation into memory CD8 T-cells. The heterodimer forms disulfide-linked complexes and homodimers, interacting with HLA-A/B2M and LCK in a zinc-dependent manner. CD8A-CD8B Heterodimer Protein, Mouse (HEK293, Flag-His) is a recombinant protein dimer complex containing mouse-derived CD8A-CD8B Heterodimer protein, expressed by HEK293, with C-His, C-Flag labeled tag. CD8A-CD8B Heterodimer Protein, Mouse (HEK293, Flag-His), has molecular weight of ~45.9 (23.7+22.2) kDa.

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Description

The CD8A, a vital immune glycoprotein, acts as a coreceptor for MHC class I:peptide complexes, connecting T-cells to antigens presented by APCs. Its interaction with TCR and MHC class I recruits LCK kinase, initiating diverse signaling pathways. This mechanism enables CTLs to recognize and eliminate infected and tumor cells. In NK-cells, CD8A homodimers provide a survival mechanism for conjugation and lysis of target cells, contributing to lymphocyte survival and differentiation into memory CD8 T-cells. The heterodimer forms disulfide-linked complexes and homodimers, interacting with HLA-A/B2M and LCK in a zinc-dependent manner. CD8A-CD8B Heterodimer Protein, Mouse (HEK293, Flag-His) is a recombinant protein dimer complex containing mouse-derived CD8A-CD8B Heterodimer protein, expressed by HEK293, with C-His, C-Flag labeled tag. CD8A-CD8B Heterodimer Protein, Mouse (HEK293, Flag-His), has molecular weight of ~45.9 (23.7+22.2) kDa.

Background

The CD8A, an integral membrane glycoprotein, plays a critical role in the immune response, fulfilling multiple functions in responses against both external and internal threats. In T-cells, it primarily functions as a coreceptor for the MHC class I molecule:peptide complex, interacting simultaneously with the T-cell receptor (TCR) and the MHC class I proteins presented by antigen-presenting cells (APCs). This interaction leads to the recruitment of the Src kinase LCK to the vicinity of the TCR-CD3 complex. LCK, in turn, initiates diverse intracellular signaling pathways, phosphorylating various substrates and ultimately promoting lymphokine production, motility, adhesion, and activation of cytotoxic T-lymphocytes (CTLs). This mechanism enables CTLs to recognize and eliminate infected cells and tumor cells. In NK-cells, the presence of CD8A homodimers at the cell surface provides a survival mechanism allowing the conjugation and lysis of multiple target cells. CD8A homodimer molecules also contribute to the survival and differentiation of activated lymphocytes into memory CD8 T-cells. The CD8A forms disulfide-linked complexes at the cell surface and also homodimers in various cell types, including NK-cells and peripheral blood T-lymphocytes. It interacts with the MHC class I HLA-A/B2M dimer and with LCK in a zinc-dependent manner.

Species

Mouse

Source

HEK293

Tag

C-His;C-Flag

Accession

P01731 (K28-Y196)&P10300 (L22-T175)

Gene ID
Synonyms
T-cell surface glycoprotein CD8; CD8a; Lyt-2; Cd8b; Lyt-3
Molecular Weight

Approximately 45.9 (23.7+22.2) kDa

Purity

Greater than 95% as determined by reducing SDS-PAGE.

Appearance

Lyophilized powder

Formulation

Lyophilized from a 0.2 μm filtered solution of PBS, pH 7.4. Normally 5 % - 8 % trehalose, mannitol and 0.01% Tween 80 are added as protectants before lyophilization.

Endotoxin Level

<1 EU/μg, determined by LAL method.

Reconstitution

It is not recommended to reconstitute to a concentration less than 100 μg/mL in ddH2O.

Storage & Stability

Stored at -20°C for 2 years. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Shipping

Room temperature in continental US; may vary elsewhere.

Documentation
Help & FAQs
  • Do most proteins show cross-species activity?

    Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

  • Reconstitution Calculator

  • Dilution Calculator

  • Specific Activity Calculator

The reconstitution calculator equation

Volume (to add to vial) = Mass (in vial) ÷ Desired Reconstitution Concentration

Volume (to add to vial) = Mass (in vial) ÷ Desired Reconstitution Concentration
= ÷

The dilution calculator equation

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
× = ×
C1   V1   C2   V2

The specific activity calculator equation

Specific Activity (Unit/mg) = 106 ÷ Biological Activity (ED50)

Specific Activity (Unit/mg) = 106 ÷ Biological Activity (ED50)
Unit/mg = 106 ÷ ng/mL

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Product Name:
CD8A-CD8B Heterodimer Protein, Mouse (HEK293, Flag-His)
Cat. No.:
HY-P74259
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