Human B7-H3 Protein, ECD (Extracellular Domain), Fc-fusion, Recombinant

Description

B7­H3 (B7 homolog 3), also known as CD276, is a single pass type I transmembrane glycoprotein that belongs to the B7 family of the Ig superfamily. Like other B7 family members, B7-H3 contains one Ig V-like and one Ig C-like domain in the extracellular region. Among the family members, they share about 20-25% amino acid identity. B7-H3 serves as an accessory modulator of T-cell response. It has been reported that B7-H3 can provide both a stimulatory and inhibitory signal to T cells. As a negative regulator, it preferentially affects Th1 responses. B7-H3 may also play an important role in muscle-immune interactions. A longer form of B7-H3 has been identified in human but not in mouse. It is termed 4IgB7­H3 or B7­H3b with two additional Ig­like domains (one V-type and one C-type). B7-H3b appears to be the dominantly expressed form in human and is found on human dendritic cells, activated T, B and NK cells. Human B7­H3b binding to an undefined receptor may inhibit NK cell killing and cytokine release.  It is also involved in late stage osteoblast differentiation. B7-H3 is detected in a variety of cancer types and its expression in some cancers correlates with poor outcome of cancer patients.

 

 

Gene Symbol: B7-H3; CD276; B7H3; B7RP-2; 4Ig-B7-H3; PSEC0249; UNQ309/PRO352

 

NCBI Gene ID: 80381

 

Uniprot Entry: Q5ZPR3

 

Construct Details: The recombinant human B7-H3-Fc fusion is expressed as a 448 amino acid protein consisting of Leu29 - Ala248 region of B7-H3 (UniProt accession #Q5ZPR3 - isoform 2) and a C-terminal Fc fusion from human IgG1, which exists as a dimer under non-reducing condition.

 

Source:  Human cells stably expressing B7-H3-Fc and growing in chemical-defined media with no animal components or antibiotics

 

Deduced Amino Acid Sequence:

LEVQVPEDPVVALVGTDATLCCSFSPEPGFSLAQLNLIWQLTDTKQLVHSFAEGQDQGSAYANRTALFPDLLAQ

GNASLRLQRVRVADEGSFTCFVSIRDFGSAAVSLQVAAPYSKPSMTLEPNKDLRPGDTVTITCSSYRGYPEAEV

FWQDGQGVPLTGNVTTSQMANEQGLFDVHSVLRVVLGANGTYSCLVRNPVLQQDAHGSVTITGQPMTFPPEAST

GTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQ

YNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV

KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSL

SPGK

 

M.W.:  Calculated molecular mass 49.2 kDa; estimated by SDS-PAGE under reducing condition 65-70 kDa probably due to glycosylation

 

Calculated PI: 5.53

 

Calculated Extinction Coefficients (M-1 cm-1, at 280nm): 54485

 

Purity: >95% judged by SDS-PAGE under reducing condition (see the gel image above)

 

Formulation: Supplied at 0.5 mg/ml in sterile PBS pH7.4 (carrier free).

 

Endotoxin Level: <0.1 EU per 1 μg of purified recombinant protein determined by the LAL method

 

Biological Activity: Inhibits anti­CD3­induced proliferation of stimulated human T cells. Binds anti-B7-H3 monoclonal antibodies, human IgG1 (SKU#MAB1755) and rabbit IgG (SKUMAB1753) in a functional ELISA (see Technical Data).

 

 

  

 

FOR RESEARCH USE ONLY. NOT FOR DIAGNOSTIC OR THERAPEUTIC USE IN HUMAN.

Restriction: This product is not transferable or re-sellable.  Customer obtain no right to transfer, assign, or sublicense its use rights, or to transfer, resell, package, or otherwise distribute the product, or to use the product for the benefit of any third party or for any commercial purpose.  Customer may only use the product in compliance with applicable local, state and federal laws, regulations and rules.  Customer may not directly or indirectly use the product or allow the transfer, transmission, export or re-export of all or any part of the product in violation of any export control law or regulation of the united states or any other relevant jurisdiction.  Your use of this product constitutes acceptance of the terms of this limited use agreement.  Please refer to our “terms & conditions” for details.  If you are not willing to accept the limitation of this agreement, G&P Biosciences will accept return of the product for a full/partial refund.

 

 

Recombinant B7-H3-Fc protein (SKU#FCL1198) was immobilized at 50 ng/well on a 96-well NuncMaxisorp plate for ELISA with serially diluted biotinylated anti-B7-H3/CD276 monoclonal antibody, human IgG1 (SKU#MAB1755B). Biotinylated anti-OX40 (SKU#MAB0103B) human IgG1 was used as a control to demonstrate the specificity of B7-H3/CD276 binding under the experimental conditions.  The binding curve was fit and apparent K_D was calculated for anti-B7-H3:B7-H3 binding to be 163 ± 7 pM.   

  

FOR RESEARCH USE ONLY. NOT FOR DIAGNOSTIC OR THERAPEUTIC USE IN HUMAN.

 

 

The product is shipped at 4°C. Upon receipt, centrifuge the product briefly before opening the vial. It is recommended to store small aliquots at the temperature below –20°C for long-term storage and the product is stable for 3 months. The undiluted protein can be stored at 4°C for no more than 2 weeks.

 

 

Use a manual defrost freezer and avoid repeated freeze-thaw cycles.

 

 

 

FOR RESEARCH USE ONLY. NOT FOR DIAGNOSTIC OR THERAPEUTIC USE IN HUMAN.

 

 

1. Nat. Immunol. 2:269 (2001). 

2. Nat. Immunol. 2:203 (2001).  

3. J. Immunol. 168:6294 (2002).  

4. J. Immunol. 172:2352 (2004).  

5. Proc. Natl. Acad. Sci. 101:12969 (2004).

 

 

 

 FOR RESEARCH USE ONLY. NOT FOR DIAGNOSTIC OR THERAPEUTIC USE IN HUMAN.

 

 

Product datasheet (pdf) can be downloaded here: FCL1198-PDS.pdf

 

 

 

Additional supporting documents, including COA and MSDS are available upon request.

 

 

 

FOR RESEARCH USE ONLY. NOT FOR DIAGNOSTIC OR THERAPEUTIC USE IN HUMAN.

Restriction: This product is not transferable or re-sellable.  Customer obtain no right to transfer, assign, or sublicense its use rights, or to transfer, resell, package, or otherwise distribute the product, or to use the product for the benefit of any third party or for any commercial purpose.  Customer may only use the product in compliance with applicable local, state and federal laws, regulations and rules.  Customer may not directly or indirectly use the product or allow the transfer, transmission, export or re-export of all or any part of the product in violation of any export control law or regulation of the united states or any other relevant jurisdiction.  Your use of this product constitutes acceptance of the terms of this limited use agreement.  Please refer to our “terms & conditions” for details.  If you are not willing to accept the limitation of this agreement, G&P Biosciences will accept return of the product for a full/partial refund.