CD55, also well known as decay-accelerating factor (DAF), is a member of the RCA (regulators of complement activation) family characterized by four to 30 SCRs (short consensus repeats) in their plasma-exposed regions. It is a major regulator of the alternative and classical pathways of complement activation and is expressed on all serum-exposed cells. CD55 is physiologically acting as an inhibitor of the complement system, but is also broadly expressed in malignant tumours. DAF seems to exert different functions beyond its immunological role such as promotion of tumorigenesis, decrease of complement mediated tumor cell lysis, autocrine loops for cell rescue and evasion of apoptosis, neoangiogenesis, invasiveness, cell motility. It is commonly hijacked by invading pathogens, including many enteroviruses and uropathogenic Escherichia coli, to promote cellular attachment prior to infection. This 70-75 kDa glycoprotein CD55 containing four SCR modules is involved in the regulation of the complement cascade. It inhibits complement activation by suppressing the function of C3/C5 convertases, thereby limiting local generation or deposition of C3a/C5a and membrane attack complex (MAC or C5b-9) production. DAF has been identified as a ligand for an activation-associated, seven-transmembrane lymphocyte receptor, CD97, which is a receptor mediating attachment and infection of several viruses and bacteria. In addition, it has been shown that DAF regulates the interplay between complement and T cell immunity in vivo, and thus may be implicated in immune and tumor biology.
Product Name:
Rat CD55/DAF Recombinant Protein (RPES4503)
Product Code:
RPES4503
Size:
50µg
Species:
Rat
Expressed Host:
HEK293 Cells
Synonyms:
CD55,DAF,Daf1
Accession:
Q9Z0M0
Sequence:
Met1-Ser371
Fusion tag:
C-Fc
Endotoxin:
<1.0 EU per µg of the protein as determined by the LAL method
Protein Construction:
A DNA sequence encoding the rat CD55 (Q9Z0M0) (Met1-Ser371) was expressed, fused with the Fc region of human IgG1 at the C-terminus.
Purity:
> 82 % as determined by SDS-PAGE
Mol Mass:
64.5 kDa
AP Mol Mass:
91 and 54 kDa
Formulation:
Lyophilized from sterile PBS, pH 7.4
Shipping:
This product is provided as lyophilized powder which is shipped with ice packs.
Stability and Storage:
Lyophilized proteins are stable for up to 12 months when stored at -20 to -80°C. Reconstituted protein solution can be stored at 4-8°C for 2-7 days. Aliquots of reconstituted samples are stable at < -20°C for 3 months.
