Human CD58 / LFA-3 Protein, Fc Tag

INTRODUCTION

QC & Assay Protocol

Citation & Background

Synonym
CD58,LFA3,Ag3
Source
Human CD58, Fc Tag (LF3-H5256) is expressed from human 293 cells (HEK293). It contains AA Phe 29 - Arg 215 (Accession # AAH05930).
Predicted N-terminus: Phe 29
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Molecular Characterization
This protein carries a human IgG1 Fc tag at the C-terminus.
The protein has a calculated MW of 48.1 kDa. As a result of differtent glycosylation, the protein migrates as 60-75 kDa under reducing (R) condition, and 125-150 kDa under non-reducing (NR) condition (SDS-PAGE).
Endotoxin
Less than 1.0 EU per μg by the LAL method.
Purity
>95% as determined by SDS-PAGE.

Formulation
Lyophilized from 0.22 μm filtered solution in 50 mM Tris, 100 mM Glycine, pH7.5. Normally trehalose is added as protectant before lyophilization.
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Reconstitution
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
Storage
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please avoid repeated freeze-thaw cycles.
No activity loss is observed after storage at:
1. 4-8^°C for 12 months in lyophilized state;
2. -70^°C for 3 months under sterile conditions after reconstitution.

SDS-PAGE

Human CD58, Fc Tag on SDS-PAGE under reducing (R) and no-reducing (NR) conditions. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 95%.

Bioactivity

Immobilized Human CD2, His Tag (Cat. No. CD2-H5226) at 2μg/mL (100 μL/well) can bind Human CD58, Fc Tag (Cat. No. LF3-H5256) with a linear range of 10-156 ng/mL (QC tested).

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Background
CD antigen CD58 is also known as Lymphocyte function-associated antigen 3 (LFA-3). CD58 is a cell adhesion molecule expressed on Antigen Presenting Cells (APC), particularly macrophages. CD58 /LFA3 is ligand of the T-lymphocyte CD2 glycoprotein, which binds to CD2 (LFA-2) [3] on T cells and is important in strengthening the adhesion between the T cells and Professional Antigen Presenting Cells. In addition, the LFA-3/CD2 interaction may prime response by both the CD2+ and LFA-3+ cells. Polymorphisms in the CD58 gene are associated with increased risk for multiple sclerosis.
References
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