Recombinant Human CD21/CR2/C3DR Protein (His Tag)

Specifications

Catalog number

PKSH031416

Size / count

100 µg

Dry ice

No

Hazardous

No

Discontinued

No

Background

The cluster of differentiation (CD) system is commonly used as cell markers in immunophynotyping. Different kinds of cells in the immune system can be identified through the surface CD molecules which associating with the immune function of the cell. There are more than 320 CD unique clusters and subclusters have been identified. Some of the CD molecules serve as receptors or ligands important to the cell through initiating a signal cascade which then alter the behavior of the cell. Some CD proteins do not take part in cell signal process but have other functions such as cell adhesion. CD21, also known as Complement component (3d / Epstein Barr virus) receptor 2 and CR2, is a member of the CD system and is a protein involved in complement system. CD21 is present on all mature B-cells and some T-cells and follicular dendritic cells. CD21 on mature B-cells form a complex called the B cell receptor complex with two other membrane proteins, CD19 and CD81. CD21 has a function in the complement system through serving as the cellular receper specific for ligands such as C3 and C4 which can be attached to foreign macromolecules in order to remove or uptake them. This results in B-cells having enhanced response to the antigen.

Synonyms

C3DR; CD21; CR; CVID7; SLEB9

UniProt

P20023

Accession Number

P20023-1

Expression System

HEK293 Cells

Tag

C-His

Sequence

Met 1-Arg 971

Applications

ELISA

Field of Research

Immunology

Endotoxin

< 1.0 EU per μg of the protein as determined by the LAL method.

Purity

> 95 % as determined by reducing SDS-PAGE.

Bioactivity

Immobilized human CD21 at 2 μg/ml (100 μl/well) can bind biotinylated human CD9.The EC50 of biotinylated human CD9 is 1.76 μg/ml.

Reconstitution

Please refer to the printed manual for detailed information.

Shipping Conditions

This product is provided as lyophilized powder which is shipped with ice packs.

Storage Conditions

Generally, 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.

Calculated Molecular Weight

106 kDa

Observed Molecular Weight

110-120 kDa

Species

Human