Protein-A is a highly stable cell surface receptor produced by several strains of Staphylococcus aureus. It is capable of binding to the Fc portion of immunoglobulins, especially IgG from a large number of species. Protein-A may be conjugated with various reporter molecules, including colloidial gold, without affecting the antibody binding site on the molecule. Protein A is immobilized on the nanogold beads.
- Particle size 1.5-2.5 nm (monodisperse), nominal 15 nm (colloidal gold)
- Suspension in 0.01 M phosphate buffered saline, pH 7.4, containing 1% bovine serum albumin, 20% glycerol, and 15 mM sodium azide.
- Storage: 2-8 C