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Synonyms
CD55, DAF, CR, CROM, TC
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Alternative_names
CD55, DAF, CR, CROM, TC
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Description
A membrane protein that regulates the complement system on the cell surface.
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Recombinant
Yes
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Source
HEK293 cells
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Purity by SDS PAGE
≥95%
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Assay
SDS-PAGE
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Biological activity
Measured by its binding ability in a functional ELISA. When rhCD55 is coated at 1 ug/ml (100 ul/well), the concentration of rhCD97 that produces 50% of the optimal binding response is found to be approximately 0.15-2.0 ug/ml.
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Results
Measured by its binding ability in a functional ELISA. When rhCD55 is coated at 1 ug/ml (100 ul/well), the concentration of rhCD97 that produces 50% of the optimal binding response is found to be approximately 0.15-2.0 ug/ml.
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Molecular Weight
This protein is fused with 6×His tag at the C-terminus, has a calculated MW of 35.8 kDa. The predicted N-terminus is Asp 35 . DTT-reduced Protein migrates as 50-65 kDa due to glycosylation.
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Storage Temp
-20°C
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Shipping
Gel Pack
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Shelf Life
12 months
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Appearance
Lyophilized
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Physical form description
Lyophilized from 0.22 um filtered solution in PBS, pH7.4. Normally Mannitol or Trehalose is added as protectants before lyophilization.
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Reconstitution Instructions
Centrifuge the vial prior to opening. Reconstitute in sterile PBS, pH 7.4 to a concentration of 50 µg/ml. Do not vortex. This solution can be stored at 2-8°C for up to 1 month. For extended storage, it is recommended to store at -20°C.
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Background Information
CD55, also known as DAF or decay accelerating factor, 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. CD55 /DAF is a 70 kDa membrane protein that regulates the complement system on the cell surface. It prevents the assembly of the C3bBb complex (the C3-convertase of the alternative pathway) or accelerates the disassembly of preformed convertase, thus blocking the formation of the membrane attack complex. This glycoprotein is broadly distributed among hematopoietic and non-hematopoietic cells. It is a determinant for the Cromer blood group system. CD55 is known to bind CD97 via the first SCR. It also binds physiologically generated C3 convertases with its second and third SCRs. Binding results in an accelerated “decay”, or dissociation of active C3 convertases, thus blocking the development of C’ attack complexes on non-foreign cells. Finally, viruses and bacteria are also known to utilize multiple SCR sites for infection.
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Handling
Centrifuge the vial prior to opening.
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Usage
For Research Use Only! Not to be used in humans
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Properties
Human proteins, cDNA and human recombinants are used in human reactive ELISA kits and to produce anti-human mono and polyclonal antibodies. Modern humans (Homo sapiens, primarily ssp. Homo sapiens sapiens). Depending on the epitopes used human ELISA kits can be cross reactive to many other species. Mainly analyzed are human serum, plasma, urine, saliva, human cell culture supernatants and biological samples.
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Additional source
Recombinants or rec. proteins
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Group
recombinants
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Gene target
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Gene symbol
CD55
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Short name
CellExp™ CD55/DAF, recombinant
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Technique
Recombinant, E. coli recombinant proteins are genetic recombinations in Escherichia coli, supplied as white sterile powder lyopillized. Biovision advises they will be reconstituted in a buffer soluion or culture medium for cell culture.
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Species
Humans
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Alternative name
H. sapiens CellExp™ CD55 molecule, decay accelerating factor to measure complement (Cromer blood group)/DAF, H. sapiens Rec.
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Alternative technique
rec
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Alternative to gene target
CD55 molecule, decay accelerating factor for complement (Cromer blood group), CR and CROM and DAF and TC, CD55 and IDBG-106331 and ENSG00000196352 and 1604, lipid binding, Extracellular, CD55 and IDBG-629269 and ENSBTAG00000006984 and 518609
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