Recombinant Human B7-H3 His-tag Protein Summary
Product Specifications
Analysis
Product Datasheets
Carrier Free
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.
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.
1949-B3
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein. |
| Reconstitution | Reconstitute at 100 μg/mL in sterile PBS containing at least 0.1% human or bovine serum albumin. |
| Shipping | The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. |
| Stability & Storage: | Store the unopened product at -20 to -70 °C. Use a manual defrost freezer and avoid repeated freeze-thaw cycles. Do not use past expiration date. |
1949-B3/CF
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS. |
| Reconstitution | Reconstitute at 100 μg/mL in sterile PBS. |
| Shipping | The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. |
| Stability & Storage: | Store the unopened product at -20 to -70 °C. Use a manual defrost freezer and avoid repeated freeze-thaw cycles. Do not use past expiration date. |
Reconstitution Calculator
Background: B7-H3
T cells require a signal induced by the engagement of the T cell receptor and a “co-stimulatory” signal(s) through distinct T cell surface molecules for optimal T cell expansion and activation. Members of the B7 superfamily of counter-receptors were identified by their ability to interact with co-stimulatory molecules found on the surface of T cells. Members of the B7 superfamily include B7-1 (CD80), B7-2 (CD86), B7-H1 (PD-L1), B7-H2 (B7RP-1), PD-L2 (B7-DC), and B7-H3 (1). Human B7-H3 was originally identified as a 316 amino acid (aa) type I membrane precursor protein with a putative 28 aa signal peptide, a 217 aa extracellular region containing one V-like and one C-like Ig domain, a transmembrane region, and a 45 aa cytoplasmic domain (2). Subsequently, a second dominantly expressed form of human B7-H3, containing a splice variation that duplicates the V-like and C-like Ig domains, was found. The 534 aa splice variant of B7-H3 has been referred to as B7-H3b, 4Ig-B7-H3, and B7-H3VCVC (3 - 5). RT-PCR transcripts for both B7-H3 and 4Ig‑B7‑H3 have been found in all tissues except peripheral blood leukocytes (5). Southern blot analysis indicates that the 4Ig-B7-H3 isoform of B7‑H3 is the predominate isoform expressed in human tissues (5). In mouse, only a single form of B7-H3 containing one V-like and one C-like Ig domain was detected (5). Mouse and human B7-H3 share 87% aa sequence identity (3). B7-H3 has been shown to be expressed at very high levels in immature dendritic cells, at moderate levels on mature dendritic cells, LPS stimulated immature dendritic cells and LPS stimulated monocytes, and at low levels on resting monocytes (3). B7-H3 binds to activated T cells via an as yet unidentified receptor. In assays using sub-optimal amount so anti-CD3 stimulation, 2Ig‑B7‑H3 enhances T cell proliferation, T cell interferon-gamma (IFN-gamma ) production, and cytotoxic T cells induction (2). In an assay in which cells were transfected with 4Ig-B7-H3 or 2Ig‑B7‑H3 and anti-CD3 antibody was added, neither 4Ig-B7-H3 nor 2Ig‑B7‑H3 was capable of co‑stimulating T cell proliferation or IFN-gamma production (4, 5).
- Coyle, A.J. and J.-C. Gutierrez-Ramos (2001) Nature Immunol. 2:203.
- Chapoval, A.I. et al. (2001) Nature Immunol. 2:269.
- Sun, M. et al. (2002) J. Immunol. 168:6294.
- Steinberger, et al. (2004) J. Immunol. 172:2352.
- Ling, V. et al. (2003) Genomic 82:365.
Citations for Recombinant Human B7-H3 His-tag Protein
R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.
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Citations: Showing 1 - 4
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Molecular imaging of T cell co-regulator factor B7-H3 with 89Zr-DS-5573a
Authors: IJG Burvenich, S Parakh, FT Lee, N Guo, Z Liu, HK Gan, A Rigopoulos, GJ O'Keefe, SJ Gong, YW Goh, H Tochon-Dan, FE Scott, M Kotsuma, K Hirotani, G Senaldi, AM Scott
Theranostics, 2018-07-30;8(15):4199-4209.
Species: Human
Sample Types: Recombinant Protein
Applications: ELISA (Capture) -
High constitutive B7-H3 expression on human keratinocytes supports T cell immunity
Authors: D Quandt, E Fiedler, A Müller, WC Marsch, B Seliger
J. Dermatol. Sci., 2017-04-11;0(0):.
Applications: Bioassay -
B7-H3 expression in colorectal cancer: associations with clinicopathological parameters and patient outcome.
Authors: Ingebrigtsen V, Boye K, Nesland J, Nesbakken A, Flatmark K, Fodstad O
BMC Cancer, 2014-08-20;14(0):602.
Species: Human
Sample Types: Whole Tissue
Applications: Bioassay -
B7-h3 augments the inflammatory response and is associated with human sepsis.
Authors: Zhang G, Wang J, Kelly J
J. Immunol., 2010-08-09;185(6):3677-84.
Species: Human
Sample Types: Whole Cells
Applications: Bioassay
FAQs
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This protein datasheet indicates I need to use a cross-linking antibody, Catalog # MAB050, for biological activity. What is this antibody and is it really necessary?
The antibody is directed against a 6x histidine repeat and is recommended for use as a cross-linker of proteins with 6x his-tag. Crosslinking is often used for proteins that require receptor trimerization and can result greater biological activity. R&D Systems Quality Control tests the performance of these proteins in the presence of the cross-linking antibody. Therefore, it is necessary to use this antibody when trying to achieve the same level of specific activity described in the datasheet.
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How many Ig domains does the Recombinant Human B7-H3 His-tag Protein (Catalog # 1949-B3) contain?
Catalog # 1949-B3, sequence Leu29-Pro245 with a C-terminal 6-His tag, contains 2 Ig domains. One Ig-like V-type 1 domain and one Ig-like C2-type 1 domain.
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