Biotinylated Recombinant Mouse CTLA-4-Fc Chimera (carrier-free)

Pricing & Availability
Other Names
Cytotoxic T-lymphocyte protein 4, Ctla4, CTLA-4, Cytotoxic T-lymphocyte-associated antigen 4, CD152, Ly-56
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publications
Mouse_CTLA-4-Fc_Chimera_Biotinylated_Protein_121318_1
When mouse CD86 (Cat. No. 771702) is immobilized at 1.0 µg/mL, Mouse CTLA-4-Fc Chimera Biotinylated Protein binds with an EC50 of 5 - 20 ng/mL.
  • Mouse_CTLA-4-Fc_Chimera_Biotinylated_Protein_121318_1
    When mouse CD86 (Cat. No. 771702) is immobilized at 1.0 µg/mL, Mouse CTLA-4-Fc Chimera Biotinylated Protein binds with an EC50 of 5 - 20 ng/mL.
  • Mouse_CTLA-4-Fc_Chimera_Biotinylated_Protein_121318_2.png
    Stability testing for Mouse CTLA4-biotin. Mouse CTLA-4-Fc Chimera Biotinylated Protein was aliquoted in PBS, pH 7.2, 5% glycerol at 0.2 mg/mL. One aliquot was frozen and thawed four times (4x Freeze/Thaws), and compared to a control kept at 4°C (Control). The samples were tested for their ability to bind immobilized mouse CD86 (Cat. No. 771702).
Cat # Size Price Quantity Avail. Save
779102 10 µg $125
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779104 25 µg $245
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779106 100 µg $730
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Description

Mouse CTLA-4 was initially identified by differential screening of a murine cytolitic cDNA library. It is a member of the IgG superfamily, and it encodes a 223 amino acid protein and possesses a single extracellular V domain, a transmembrane domain, and a cytoplasmic domain. CTLA-4 is ~30% homologous with CD28, and both bind to the same ligands (B7.1/CD80 and B7.2/CD86) although CTLA-4 binds with higher affinity than CD28. Parallel recognition of a specific MHC-peptide complex by the T-cell receptor and CD80 or CD86 by the costimulatory receptor CD28 results in T cell activation, cytokine production, proliferation, and differentiation. After the T cells' activation process and upregulation of CTLA-4, co-ligation of the TCR to MHC-peptide complex and CTLA-4 to its ligands results in cell cycle arrest and the end to T cell activation. It has been suggested that the negative regulatory mechanism of CTLA-4 is mediated through trans-endocytosis of CD80 and CD86 (capture of ligands from opposing cells). The ligands are removed from the original cell and degraded inside of CTLA-4-expressing cells. As a result, the action of CD28 is impaired. Alternative splice variants of CTLA-4 have been described in mice and humans; these variants skip exon 2 (ligand-binding domain) or exon 3 (transmembrane domain). The ligand independent CTLA-4 is expressed in mice, but not in humans, and the soluble CTLA-4 (sCTLA-4) is expressed in mice and humans. CTLA-4 is constitutively expressed by Tregs, and they are an important source of sCTLA-4. It has been suggested that sCTLA-4 potentiates regulatory T cell function. High levels of sCTLA-4 in Tregs have been associated with type 1 diabetes (T1D) and other autoimmune diseases.

Product Details
Technical data sheet

Product Details

Reactivity
Mouse
Source
Mouse CTLA-4, amino acids Ala37-Phe162 (Accession# AAH42741), with a C-terminal human IgG1 Fc and a 6His-tag was expressed in CHO cells.
Molecular Mass
The unlabeled 366 amino acid recombinant protein has a predicted molecular mass of approximately 41 kD. The DTT-reduced and non-reduced glycosylated proteins migrate at approximately 55 kD and 110 kD respectively by SDS-PAGE. The predicted N-terminal amino acid is Ala.
Purity
> 95%, as determined by Coomassie stained SDS-PAGE.
Formulation
0.22 μm filtered protein solution is in PBS, pH 7.2, 5% glycerol.
Endotoxin Level
Less than 0.1 EU per μg protein as determined by the LAL method.
Concentration
10-25 µg sizes are bottled at 200 µg/mL. 100 µg size is lot-specific and bottled at the concentration indicated on the vial. (Please contact technical support for concentration, or use our Lookup tool if you have a lot number.)
Storage & Handling
Unopened vial can be stored between 2°C and 8°C for one month, at -20°C for six months, or at -70°C for one year. For maximum results, quick spin vial prior to opening. The protein can be aliquoted and stored at -20°C to -70°C. Stock solutions can also be prepared at 50-100 µg/mL in sterile buffer (PBS, HPBS, DPBS, or EBSS) containing carrier protein such as 0.2-1% BSA or HSA and stored in working aliquots at -20°C to -70°C. Avoid repeated freeze/thaw cycles.
Activity
When mouse B7-2/CD86 (Cat. No. 771702) is immobilized at 1.0 µg/mL, mouse CTLA-4-Fc Chimera Biotinylated Protein binds with EC50 of 5 - 20 ng/mL. HRP Avidin (Cat. No. 405103) was used to detect the binding.
Application

Bioassay

Application Notes

BioLegend carrier-free recombinant proteins provided in liquid format are shipped on blue ice. Our comparison testing data indicates that when handled and stored as recommended, the liquid format has equal or better stability and shelf-life compared to commercially available lyophilized proteins after reconstitution. Our liquid proteins are validated in-house to maintain activity after shipping on blue ice and are backed by our 100% satisfaction guarantee. If you have any concerns, contact us at tech@biolegend.com.

Antigen Details

Structure
Disulfide-linked homodimer, biotinylated via amines
Distribution

Activated T cells, CD4, CD8, and Tregs

Function
Inhibits T cell activation by reducing IL-2 production and IL-2R expression, also arresting T cells in G1 phase of the cell cycle; protects against the development of autoimmunity.
Interaction
Antigen presenting cells, B cells
Ligand/Receptor
CD80 (B7.1), CD86 (B7.2)
Bioactivity
Measured by its ability to bind mouse CD86
Cell Type
B cells, T cells, Tregs
Biology Area
Immunology, Inhibitory Molecules
Molecular Family
CD Molecules, Immune Checkpoint Receptors, Soluble Receptors
Gene ID
12477 View all products for this Gene ID
UniProt
View information about CTLA-4 on UniProt.org

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Go To Top Version: 1    Revision Date: 12/13/2018

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