Recombinant Human B7-1/CD80 His-tag Protein, CF

Catalog # Availability Size / Price Qty
9050-B1-100
9050-B1-01M
R&D Systems Recombinant Proteins and Enzymes
1 Image
Product Details
FAQs
Supplemental Products
Reviews (1)

Recombinant Human B7-1/CD80 His-tag Protein, CF Summary

Product Specifications

Purity
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Activity
Measured by its binding ability in a functional ELISA. When Recombinant Human B7-1/CD80 is immobilized at 1 µg/mL (100 µL/well), the concentration of Recombinant Human CTLA-4 Fc Chimera (Catalog # 7268-CT) that produces 50% of the optimal binding response is approximately 0.05-0.3 μg/mL.
Source
Human embryonic kidney cell, HEK293-derived human B7-1/CD80 protein
Val35-Asn242, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Analysis
Val35
Predicted Molecular Mass
25 kDa
SDS-PAGE
45-58 kDa, reducing conditions

Complete Your Experiment

Product Datasheets

You must select a language.

x

9050-B1

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

9050-B1

Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 500 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

=
÷

Background: B7-1/CD80

B7-1/CD80 and B7-2/CD86, together with their receptors CD28 and CTLA-4, constitute one of the dominant co-stimulatory pathways that regulate T- and B-cell responses (1). Although both CTLA-4 and CD28 can bind to the same ligands, CTLA-4 binds to B7-1 and B7-2 with a 20-100 fold higher affinity than CD28 and is involved in the down-regulation of the immune response (2-6). Mature human B7-1 consists of a 208 aa extracellular domain (ECD) with two immunoglobulin-like domains, a 21 aa transmembrane domain, and a 25 aa cytoplasmic domain (7). Within the ECD, human B7-1 shares 50% aa sequence identity with mouse and rat
B7-1. Alternative splicing generates a 30 kDa soluble isoform that lacks the transmembrane segment and retains the ability to bind CD28 and CTLA-4 and an isoform that lacks the second Ig-like domain and the transmembrane segment (8). Both human and mouse B7-1 and B7-2 can bind to either human or mouse CD28 and
CTLA-4 (1). B7-1 is expressed on activated B cells, activated T cells, and macrophages. B7-2 is constitutively expressed on interdigitating dendritic cells, Langerhans cells, peripheral blood dendritic cells, memory B cells, and germinal center B cells (2).

References
  1. Ville, S. et al. (2015) Front. Immunol. 6:411.
  2. Azuma, M. et al. (1993) Nature 366:76.
  3. Freeman, G.J. et al. (1993) Science 262:909.
  4. Chen, C. et al. (1994) J. Immunol. 152:4929.
  5. Freeman, G.J. et al. (1993) J. Exp. Med. 178:2185.
  6. Lanier, L. et al. (1995) J. Immunol. 154:97.
  7. Freeman, G.J. et al. (1989) J. Immunol. 143:2714.
  8. Kakoulidou, M. et al. (2007) Scand. J. Immunol. 66:529.
Entrez Gene IDs
941 (Human); 12519 (Mouse); 25408 (Rat); 102140078 (Cynomolgus Monkey)
Alternate Names
Activation B7-1 antigen; B7; B71; B7-1; BB1; CD28LG1; CD28LGB7-1 antigen); CD80 antigen; CD80 molecule; CD80; costimulatory factor CD80; costimulatory molecule variant IgV-CD80; CTLA-4 counter-receptor B7.1; T-lymphocyte activation antigen CD80

FAQs

No product specific FAQs exist for this product, however you may

View all Proteins and Enzyme FAQs

Reconstitution Buffers

Reviews for Recombinant Human B7-1/CD80 His-tag Protein, CF

Average Rating: 4 (Based on 1 Review)

5 Star
0%
4 Star
100%
3 Star
0%
2 Star
0%
1 Star
0%

Have you used Recombinant Human B7-1/CD80 His-tag Protein, CF?

Submit a review and receive an Amazon gift card.

$25/€18/£15/$25CAN/¥75 Yuan/¥1250 Yen for a review with an image

$10/€7/£6/$10 CAD/¥70 Yuan/¥1110 Yen for a review without an image

Submit a Review

Filter by:


Recombinant Human B7-1/CD80 His-tag Protein, CF
By Anonymous on 09/12/2020
Application: Binding assay/Protein-protein interaction

Octet: immobilize PDL1, and monitor binding of CD80-his