Product Specifications for Recombinant Human CD59 Protein, CF
Mouse myeloma cell line, NS0-derived human CD59 protein Leu26-Asn102, with a C-terminal 10-His tag
>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
<0.01 EU per 1 μg of the protein by the LAL method.
N-terminal sequence Analysis
Starts at Leu26
Predicted Molecular Mass
10-20 kDa, reducing conditions
Measured by its binding ability in a functional ELISA. When recombinant human C9 is coated at 5 μg/mL (100 μL/well), the concentration of Recombinant Human CD59 that produces 50% optimal binding response is 0.6‑3 μg/mL.
Formulation, Preparation and Storage
What does CF mean?
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our
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
Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitute at 100 μg/mL in PBS.
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.
CD59, also known as membrane attack complex inhibition factor (MACIF) and Protectin, is an approximately 20 kDa GPI‑anchored glycoprotein that is an important regulator of the complement system in blood. The complement system triggers innate immune responses to immune complexes, MBL‑opsonized microorganisms, and apoptotic cells through the classical, lectin, and alternative pathways. One major consequence of complement activation is the assembly of a membrane attack complex (MAC) composed of one molecule each of complement proteins C5b, C6, C7, and C8 (C5b‑8) followed by the incorporation of multiple copies of C9 (C5b‑9). Membrane insertion of the MAC results in formation of a cytolytic pore in the target cell (1). CD59, which is widely expressed on healthy cells, binds to both C8 and C9 and shields them from complement‑mediated lysis. It inhibits MAC pore formation by blocking C5b‑8 complex membrane insertion and the incorporation of C9 molecules (2‑4). The binding of CD59 to C8 and C9 is species‑selective, and this contributes to the restricted ability of MACs to lyse cells of other species (5). The cytoprotective function of CD59 plays a variety of roles in pathology. It limits tissue damage and inflammation following ischemia/reperfusion injury (6, 7). It also protects against the development of atherosclerosis and abdominal aortic aneurysms (8, 9). Its protectiveness can be inactivated by diabetes‑induced glycation, leading to increased MAC deposition and hemolytic anemia (10). In contrast, CD59 can be exploited to promote red cell lysis; it functions as a cellular receptor for the bacterial pore‑forming toxin Intermedilysin (11). CD59 can be incorporated into several enveloped viruses such as hepatitis C virus where it limits the destruction of virus particles (12). Aside from its complement regulatory functions, CD59 limits the activation of T cells following their interaction with antigen presenting cells (13), but it promotes NK cell activation through association with NKp30 and NKp46 (14). In mouse, gene duplication has given rise to two related proteins, CD59a and CD59b. Mature human CD59 shares 37%, 43%, and 44% amino acid sequence identity with mouse CD59a, mouse CD59b, and rat CD59, respectively (15).
Ricklin, D. et al. (2010) Nat. Rev. Immunol. 11:785.
Farkas, I. et al. (2002) J. Physiol. 539:537.
Meri, S. et al. (1990) Immunology 71:1.
Rollins, S.A. and P.J. Sims (1990) J. Immunol. 144:3478.
Rollins, S.A. et al. (1991) J. Immunol. 146:2345.
Turnberg, D. et al. (2004) Am. J. Physiol. 165:825.
Zhang, J. et al. (2011) Am. J. Pathol. 179:2876.
Wu, G. et al. (2009) Circ. Res. 104:550.
Wu, G. et al. (2010) Circulation 121:1338.
Acosta, J. et al. (2000) Proc. Natl. Acad. Sci. USA 97:5450.
Giddings, K.S. et al. (2004) Nat. Str. Mol. Biol. 11:1173.
Amet, T. et al. (2012) Hepatology 55:354.
Xie, X.-H. et al. (2012) Cell. Immunol. 274:1.
Marcenaro, E. et al. (2003) Eur. J. Immunol. 33:3367.
Which Brands are Currently Available on bio‑techne.com? R&D Systems, Tocris Bioscience and ProteinSimple branded products are available to purchase through bio‑techne.com. ProteinSimple branded instruments are available to quote. ACD branded products will be available on bio‑techne.com in the near future. Novus Biologicals branded products are not currently available on bio‑techne.com and can be found at novusbio.com.
Setting the standard in quality research reagents for over 30 years
A trusted leader in quality life science reagents
Your trusted supplier for innovative and high performance life science reagents
Proprietary systems and consumables for simpler, more quantitative and affordable protein analysis
Proprietary RNAscope® technology capable of detecting and quantifying RNA biomarkers in situ at single molecule sensitivity
A world leader in developing liquid biopsy based diagnostics