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Human Siglec-2/CD22 Protein

Product Info

Recombinant Human Siglec-2/CD22 Protein is expressed from Expi293 with His tag at the C-terminal. It contains Asp20-Arg687.[Accession | P20273]

Molecular Weight

The protein has a predicted MW of 76.2 kDa. Due to glycosylation, the protein migrates to 100-120 kDa based on Tris-Bis PAGE result.


Less than 1EU per μg by the LAL method.


> 95% as determined by Tris-Bis PAGE
> 95% as determined by HPLC


Lyophilized from 0.22μm filtered solution in PBS (pH 7.4). Normally 5 % trehalose is added as protectant before lyophilization.


Centrifuge tubes before opening. Reconstituting to a concentration more than 100 μg/ml is recommended. Dissolve the lyophilized protein in distilled water.


The product should be stored at -70℃ or -20℃.

Assay Data
Tris-Bis PAGE

Human Siglec-2/CD22 on Tris-Bis PAGE under reduced condition. The purity is greater than 95%.


The purity of Human Siglec-2/CD22 is greater than 95% as determined by SEC-HPLC.


Immobilized Human Siglec-2 at 0.5μg/ml (100μl/well) on the plate. Dose response curve for Anti-Siglec-2 Antibody, hFc Tag with the EC50 of 19.1ng/ml determined by ELISA.


CD22, or cluster of differentiation-22, is a molecule belonging to the SIGLEC family of lectins. It is found on the surface of mature B cells and to a lesser extent on some immature B cells. CD22 a member of the immunoglobulin superfamily. CD22 functions as an inhibitory receptor for B cell receptor (BCR) signaling. It is also involved in the B cell trafficking to Peyer's patches in mice.


CD22 molecule; CD22; Siglec2; Siglec-2;B-cell receptor CD22; BL-CAM; B-lymphocyte cell adhesion molecule; CD22 antigenMGC130020;sialic acid binding Ig-like lectin 2; Sialic acid-binding Ig-like lectin 2;  SIGLEC2FLJ22814; T-cell surface antigen Leu-14


(1)Kato J , Robert T. O’Donnell, Abuhay M , et al. Efficacy and toxicity of a CD22-targeted antibody-saporin conjugate in a xenograft model of non-Hodgkin’s lymphoma[J]. OncoImmunology, 2012, 1(9):7.

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