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Active Cluster Of Differentiation 2 (CD2)

LFA2; SRBC; T11; T-Cell Surface Antigen T11/Leu-5; LFA-3 Receptor; Lymphocyte Function Associated Antigen 2; Erythrocyte Receptor; Rosette Receptor; Sheep Red Blood Cell Receptor

ACTIVITY TEST

Cluster of Differentiation 2 (CD2) is a surface antigen found on all peripheral blood T-cells. CD2 functions as an activator of T lymphocytes and thymocytes. Mature human CD2 consists of a 185 amino acid (aa) extracellular domain (ECD) with an Ig-like V-type and an Ig-like C2 type domain, a 26 aa transmembrane segment, and a 116 aa cytoplasmic tail. Cluster of Differentiation 5 (CD5) has been identified as an interactor of CD2, thus a functional binding ELISA assay was conducted to detect the interaction of recombinant human CD2 and recombinant human CD5. Briefly, CD2 were diluted serially in PBS, with 0.01% BSA (pH 7.4). Duplicate samples of 100 µl were then transferred to CD5-coated microtiter wells and incubated for 2h at 37℃. Wells were washed with PBST and incubated for 1h with anti-CD2 pAb, then aspirated and washed 3 times. After incubation with HRP labelled secondary antibody, wells were aspirated and washed 3 times. With the addition of substrate solution, wells were incubated 15-25 minutes at 37℃. Finally, add 50 µL stop solution to the wells and read at 450 nm immediately. The binding activity of recombinant human CD2 and recombinant human CD5 was shown in Figure 1, the EC50 was 1.88 ug/ml.

USAGE

Reconstitute in 10mM PBS (pH7.4) to a concentration of 0.1-1.0 mg/mL. Do not vortex.

STORAGE

Avoid repeated freeze/thaw cycles. Store at 2-8°C for one month. Aliquot and store at -80°C for 12 months.

STABILITY

The thermal stability is described by the loss rate. The loss rate was determined by accelerated thermal degradation test, that is, incubate the protein at 37°C for 48h, and no obvious degradation and precipitation were observed. The loss rate is less than 5% within the expiration date under appropriate storage condition.

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