Recombinant Human CD200 Biotinylated Protein (carrier-free)

Pricing & Availability
Other Names
OX-2 membrane glycoprotein, OX-2, OX2, MRC OX-2, MOX1, MOX2, My033
Ave. Rating
Submit a Review
Product Citations
When human CD200R1 is immobilized at 0.5 µg/mL, human CD200 Biotin binds with EC50 of 1.5 - 6.0 ng/mL.
  • Human_CD200_Biotinylated_Prot_RECOM_CF_1_011618
    When human CD200R1 is immobilized at 0.5 µg/mL, human CD200 Biotin binds with EC50 of 1.5 - 6.0 ng/mL.
  • Human_CD200_Biotinylated_Prot_RECOM_CF_2_011618
    Human CD200 biotin was aliquoted in PBS, 5% glycerol at 0.2 mg/ml. One aliquot was freeze and thawed four times (4x freeze/thaws), and compared to a control kept at 4°C (control). The samples were tested in a binding assay with human CD200R1.
Cat # Size Price Quantity Avail. Save
770202 10 µg $95
Check Availability

Need larger quantities of this item?
Request Bulk Quote
770204 25 µg $195
Check Availability

Need larger quantities of this item?
Request Bulk Quote
770206 100 µg $540
Check Availability

Need larger quantities of this item?
Request Bulk Quote

CD200 (OX-2) is a 45 kD cell surface glycoprotein that belongs to the immunoglobulin superfamily (IgSF). CD200 is composed of 202 amino acid extracellular domain containing two IgSF domains, 27 amino acid transmembrane segment, and a 19 amino acid cytoplasmic domain. CD200 is the only known ligand of the CD200R family and it is highly conserved in the CNS, expressed mainly by neurons and vascular endothelium. It is also present in most peripheral cell types, thymocytes, T and B cells, and dendritic cells. CD200 and CD200R interact with each other through N-terminal IgSF domains. Their interaction plays important roles in negatively regulating immune responses, and attenuating autoimmune diseases and excessive inflammatory responses against pathogens. High expression of CD200 in CNS is thought to be a mechanism of constitutive immune suppression, and is developmentally regulated in the mouse brain. Deficiency in neuronal CD200 may explain the chronic inflammation in human neurodegenerative diseases such as Alzheimer, Parkinson, and multiple sclerosis. CD200 and CD200R interaction has also been shown to play an important role in the regulation of anti-tumor immunity, and overexpression of CD200 has been reported in a number of malignancies, including CLL, as well as on cancer stem cells.

Product Details
Technical data sheet

Product Details

Human CD200, amino acids Gln31-Gly232 (Accession # P41217) with a C-terminal human IgG1 Fc and 6-His tag was expressed in 293E cells.
Molecular Mass
The unlabeled 446 amino acid recombinant protein has a predicted molecular mass of approximately 50 kD. The DTT-reduced protein migrates at approximately 65 kD and and non-reduced protein migrates at approximately 130 kD by SDS-PAGE. The predicted N-terminal amino acid is Gln.
>95 %, as determined by Coomassie stained SDS-PAGE.
0.22 µm filtered protein solution is in PBS, pH 7.2, 5% Glycerol
Endotoxin Level
Less than 1.0 EU per µg protein as determined by the LAL method.
10 and 25 µg sizes are bottled at 200 µg/mL. 100 µg and larger sizes are 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 months, 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.
When human CD200R1 is immobilized at 0.5 µg/mL, human CD200 Biotin binds with EC50 of 1.5 – 6.0 ng/mL.


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

Antigen Details

Disulfide-linked homodimer, biotinylated via amines

Neurons and vascular endothelium in CNS, and most peripheral cell types, thymocytes, T and B cells, and dendritic cells.

Costimulates T-cell proliferation. May regulate myeloid cell activity in a variety of tissues.
Mast cells, basophils, macrophages, and dendritic cells
Ligand Receptor
Measured by it’s ability to bind immobilized hCD200R1
Biology Area
Cell Biology, Immunology, Neuroscience, Neuroscience Cell Markers, Costimulatory Molecules
Molecular Family
CD Molecules, Soluble Receptors
Antigen References

1. Hernangomez M, C. et al. 2014. Curr Pharm Des. 20:4707-22.
2. Walker DG, Lue LF. 2013. Future Neurol. 10.2217/fnl.13.14.
3. Wright GJ, et al. 2003. J Immunol. 171: 3034-46.
4. Vaine CA, Soberman RJ. 2014. Adv Immunol. 121:191-211.
5. Minas K, et al. 2006. Crit Rev Immunol. 26(3): 213-30.
6. Wang XJ, et al. 2007. J Neuroimmune Pharmacol. 2(3): 259-64.
7. Wong KK, et al. 2010. J Leukoc Biol. 88(2): 361-72.

Gene ID
4345 View all products for this Gene ID
View information about CD200 Biotinylated Protein on

Related FAQs

Does specific activity of a recombinant protein vary between lots?

Specific activity will vary for each lot and for the type of experiment that is done to validate it, but all passed lots will have activity within the established ED50 range for the product and we guarantee that our products will have lot-to-lot consistency. Please conduct an experiment-specific validation to find the optimal ED50 for your system.

Have your recombinants been tested for stability?

Our testing shows that the recombinant proteins are able to withstand room temperature for a week without losing activity. In addition the recombinant proteins were also found to withstand four cycles of freeze and thaw without losing activity.

How do you convert activity as an ED50 in ng/ml to a specific activity in Units/mg?
Use formula Specific activity (Units/mg) = 10e6/ ED50 (ng/mL)
How does the activity of your recombinant proteins compare to competitors?

We quality control each and every lot of recombinant protein. Not only do we check its bioactivity, but we also compare it against other commercially available recombinant proteins. We make sure each recombinant protein’s activity is at least as good as or better than the competition’s. In order to provide you with the best possible product, we ensure that our testing process is rigorous and thorough. If you’re curious and eager to make the switch to BioLegend recombinants, contact your sales representative today!

What is the specific activity or ED50 of my recombinant protein?

The specific activity range of the protein is indicated on the product datasheets. Because the exact activity values on a per unit basis can largely fluctuate depending on a number of factors, including the nature of the assay, cell density, age of cells/passage number, culture media used, and end user technique, the specific activity is best defined as a range and we guarantee the specific activity of all our lots will be within the range indicated on the datasheet. Please note this only applies to recombinants labeled for use in bioassays. ELISA standard recombinant proteins are not recommended for bioassay usage as they are not tested for these applications.

Go To Top Version: 0    Revision Date: 01/17/2018

For research use only. Not for diagnostic use. Not for resale. BioLegend will not be held responsible for patent infringement or other violations that may occur with the use of our products.


*These products may be covered by one or more Limited Use Label Licenses (see the BioLegend Catalog or our website, BioLegend products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products, reverse engineer functionally similar materials, or to provide a service to third parties without written approval of BioLegend. By use of these products you accept the terms and conditions of all applicable Limited Use Label Licenses. Unless otherwise indicated, these products are for research use only and are not intended for human or animal diagnostic, therapeutic or commercial use.


8999 BioLegend Way, San Diego, CA 92121
Toll-Free Phone: 1-877-Bio-Legend (246-5343) Phone: (858) 768-5800 Fax: (877) 455-9587

Forgot your password? Reset Password
Request an Account