Human CD55/DAF Antibody

Catalog #: MAB20091 Datasheet / COA / SDS

Catalog #	Availability	Size / Price	Qty
MAB20091
MAB20091-SP

All CD55/DAF Antibodies

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Summary Preparation and Storage Reconstitution Calculator Background Product Datasheets Related Research Areas

Human CD55/DAF Antibody Summary

Species Reactivity

Human

Specificity

Detects human CD55/DAF.

Source

Monoclonal Mouse IgG₁ Clone # 278810

Purification

Protein A or G purified from hybridoma culture supernatant

Immunogen

NS0-derived recombinant human CD55/DAF
Asp35-Ser353
Accession # P08174.4

Formulation

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.

Endotoxin Level

<0.10 EU per 1 μg of the antibody by the LAL method.

Label

Unconjugated

Applications

Recommended Concentration

Sample

Flow Cytometry

0.25 µg/10⁶ cells

Human whole blood

CyTOF-ready

Ready to be labeled using established conjugation methods. No BSA or other carrier proteins that could interfere with conjugation.

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.

Reconstitution Calculator

Preparation and Storage

Reconstitution

Reconstitute at 0.5 mg/mL in sterile PBS.

Shipping

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).

References

Herbert, A. et al. (2002) Biochem. Soc. Trans. 30:990.
Miwa, T. and W-C. Song (2001) Int. Immunopharmacol. 1:445.
Hourcade, D. et al. (2000) Immunopharmacology 49:103.
Lea, S. (2002) Biochem. Soc. Trans. 30:1014.
Medof, M.E. et al. (1987) Proc. Natl. Acad. Sci. USA 84:2007.
Caras, I.W. et al. (1987) Nature 325:545.
Lukacik, P. et al. (2004) Proc. Natl. Acad. Sci. USA 101:1279.
Moran, P. et al. (1991) J. Biol. Chem. 266:1250.
Lublin, D.M. et al. (1994) Blood 84:1276.
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