Human CD55/DAF Antibody

Catalog # Availability Size / Price Qty
CD55/DAF in HeLa and MOLT-4 Human Cell Lines.
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Product Details
Citations (5)
Supplemental Products

Human CD55/DAF Antibody Summary

Species Reactivity
Detects human CD55/DAF in direct ELISAs and Western blots.
Polyclonal Goat IgG
Antigen Affinity-purified
Mouse myeloma cell line NS0-derived recombinant human CD55/DAF
Accession # P08174
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.


Recommended Concentration
5-15 µg/mL
See below
0.5-15 µg/mL
See below

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Scientific Data

Immunocytochemistry CD55/DAF antibody in HeLa and MOLT-4 Human Cell Lines by Immunocytochemistry (ICC). View Larger

CD55/DAF in HeLa and MOLT-4 Human Cell Lines. CD55/DAF was detected in immersion fixed HeLa human cervical epithelial carcinoma cell line (left panel, positive staining) and MOLT-4 human acute lymphoblastic leukemia cell line (right panel, negative staining) using Goat Anti-Human CD55/DAF Antigen Affinity-purified Polyclonal Antibody (Catalog # AF2009) at 0.5 µg/mL for 3 hours at room temperature. Cells were stained using the NorthernLights™ 557-conjugated Anti-Goat IgG Secondary Antibody (red; Catalog # NL001) and counterstained with DAPI (blue). Specific staining was localized to plasma membrane and cytoplasm. View our protocol for Fluorescent ICC Staining of Cells on Coverslips.

Immunohistochemistry CD55/DAF antibody in Human Colon Cancer Tissue by Immunohistochemistry (IHC-P). View Larger

CD55/DAF in Human Colon Cancer Tissue. CD55/DAF was detected in immersion fixed paraffin-embedded sections of human colon cancer tissue using 15 µg/mL Goat Anti-Human CD55/DAF Antigen Affinity-purified Polyclonal Antibody (Catalog # AF2009) overnight at 4 °C. Tissue was stained with the Anti-Goat HRP-DAB Cell & Tissue Staining Kit (brown; Catalog # CTS008) and counterstained with hematoxylin (blue). View our protocol for Chromogenic IHC Staining of Paraffin-embedded Tissue Sections.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Preparation and Storage

Reconstitute at 0.2 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Size / Price
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
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.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: CD55/DAF

CD55, also known as DAF or decay-accelerating factor, is a 70‑75 kDa member of the RCA family of proteins. Human RCA (regulators of complement/C’ activation) proteins are products of chromosome 1 genes that are ubiquitously expressed on cells exposed to plasma complement proteins (1‑4). A hallmark of RCA proteins is the presence of four to 30 SCRs (short consensus repeats; also called CCPs for C’ control protein modules) in their plasma-exposed regions. SCRs are characterized by a 60‑65 amino acid (aa) module that contains a highly conserved Trp residue and two internal disulfide bonds that create a beta -barrel structure (1). Human CD55 is synthesized as a 381 aa precursor that contains a 34 aa signal sequence, a 319 aa mature region and a 28 aa C-terminal prosegment (5, 6). The mature region contains four SCR modules and a C-terminal O-glycosylated extension (7). Following cleavage of the prosegment, a serine is exposed that serves as an anchor for a GPI-linkage (8). Multiple polymorphisms are found in the molecule. Alternate splicing also exists. One form that may not be translated shows an intron insertion in the prosegment, resulting in a 79 aa substitution for the standard C-terminal 20 aas of the prosegment (6). Another form generates a truncated 199 aa precursor that cannot be membrane-bound and may not be secreted (9). Mature CD55 is 53% and 84% aa identical to mouse and monkey CD55, respectively. CD55 is known to bind CD97 via the first SCR (4). It also binds physiologically-generated C3 convertases with its second and third SCRs (7, 10). Binding results in an accelerated “decay”, or dissociation of active C3 convertases, thus blocking the development of C’ attack complexes on nonforeign cells (1, 2). Finally, viruses and bacteria are also known to utilize multiple SCR sites for infection (4).

  1. Herbert, A. et al. (2002) Biochem. Soc. Trans. 30:990. 
  2. Miwa, T. and W-C. Song (2001) Int. Immunopharmacol. 1:445. 
  3. Hourcade, D. et al. (2000) Immunopharmacology 49:103. 
  4. Lea, S. (2002) Biochem. Soc. Trans. 30:1014. 
  5. Medof, M.E. et al. (1987) Proc. Natl. Acad. Sci. USA 84:2007. 
  6. Caras, I.W. et al. (1987) Nature 325:545.
  7. Lukacik, P. et al. (2004) Proc. Natl. Acad. Sci. USA 101:1279.
  8. Moran, P. et al. (1991) J. Biol. Chem. 266:1250.
  9. Lublin, D.M. et al. (1994) Blood 84:1276.
  10. Williams, P. et al. (2003) J. Biol. Chem. 278:10691.
Entrez Gene IDs
1604 (Human); 13136 (Mouse)
Alternate Names
CD55 antigen; CD55 molecule, decay accelerating factor for complement (Cromer blood group); CD55; CR; CRdecay accelerating factor for complement (CD55, Cromer blood group system); CROMDAFcomplement decay-accelerating factor; DAF; decay accelerating factor for complement; TC

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Citations for Human CD55/DAF Antibody

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.

5 Citations: Showing 1 - 5
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  1. Complement Regulation in Human Tenocytes under the Influence of Anaphylatoxin C5a
    Authors: S Silawal, B Kohl, J Shi, G Schulze-Ta
    International Journal of Molecular Sciences, 2021;22(6):.
    Species: Human
    Sample Types: Whole Cells
    Applications: ICC
  2. Using chemiluminescence imaging of cells (CLIC) for relative protein quantification
    Authors: J Fisher, OE Sørensen, AHA Abu-Humaid
    Sci Rep, 2020;10(1):18280.
    Species: Human
    Sample Types: Whole Cells
    Applications: ICC
  3. The effect of vascular endothelial growth factor on osteoclastogenesis in rheumatoid arthritis.
    Authors: Kim H, Kim K, Kim B, Cho M, Lee S
    PLoS ONE, 2015;10(4):e0124909.
    Species: Human
    Sample Types: Whole Tissue
    Applications: IHC-Fr
  4. Escherichia coli type 1 pili trigger late IL-8 production by neutrophil-like differentiated PLB-985 cells through a Src family kinase- and MAPK-dependent mechanism.
    Authors: Semiramoth N, Gleizes A, Turbica I, Sandre C, Gorges R, Kansau I, Servin A, Chollet-Martin S
    J. Leukoc. Biol., 2009;85(2):310-21.
    Species: Human
    Sample Types: Cell Lysates
    Applications: Western Blot
  5. Receptor for advanced glycation endproducts mediates neutrophil migration across intestinal epithelium.
    Authors: Zen K, Chen CX, Chen YT, Wilton R, Liu Y
    J. Immunol., 2007;178(4):2483-90.
    Species: Human
    Sample Types: Whole Cells
    Applications: ICC


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Isotype Controls

Reconstitution Buffers

Secondary Antibodies

Goat IgG (H+L) Antibody


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