Recombinant Human CD55 protein, His-tagged
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|Product Overview :||Recombinant Human CD55 protein (Asp35-Ser353), fused to His tag at C-terminus, was expressed in human 293 cells (HEK293).|
|Description :||CD55 is also known as DAF or decayaccelerating 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 physiologicallygenerated 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 nonforeign cells. Finally, viruses and bacteria are also known to utilize multiple SCR sites for infection.|
|Form :||Lyophilized from 0.22 um filtered solution in PBS, pH7.4, 10% trehalose.|
|Molecular Mass :||The protein has a calculated MW of 35.8 kDa. The protein migrates as 50-65 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.|
|Protein length :||319|
|Endotoxin :||Less than 1.0 EU per ug by the LAL method.|
|Purity :||>95% as determined by SDS-PAGE.|
|Storage :||For long term storage, the product should be stored at lyophilized state at -20 centigrade or lower.
Please avoid repeated freeze-thaw cycles.
This product is stable after storage at:
-20 centigrade to -70 centigrade for 12 months in lyophilized state;
-70 centigrade for 3 months under sterile conditions after reconstitution.
|Reconstitution :||It is recommended that sterile water be added to the vial to prepare a stock solution of 0.2 ug/ul. Centrifuge the vial at 4ºC before opening to recover the entire contents.|
|SDS-PAGE of CD55-65H :||
Human CD55, His Tag on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 95%.
|Gene Name :||CD55|
|Official Symbol :||CD55|
|Synonyms :||CD55; CD55 molecule, decay accelerating factor for complement (Cromer blood group); DAF, decay accelerating factor for complement (CD55, Cromer blood group system); complement decay-accelerating factor; CR; CROM; TC; CD55 antigen; DAF|
|Gene ID :||1604|
|mRNA Refseq :||NM_000574|
|Protein Refseq :||NP_000565|
|UniProt ID :||P08174|
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