Streptavidin is a biotin-binding protein purified from Streptomyces avidinii with a near neutral isoelectric point. Streptavidin is composed of 4 identical polypeptide chain subunits, which binds 4 moles of biotin per mole of protein with a high affinity (Kd ~10-15). ProteoChem's high purity streptavidin has a specific activity >14.0 U/mg of protein and is predominantly a single band by SDS-PAGE. Streptavidin is lyophilized and may be reconstituted with water.
Biotinylate your protein or antibody of interest using ProteoChem's Biotinylation Reagents for use in conjunction with streptavidin.
Molecular Weight: ~52,000 daltons
CAS Number: 9013-20-1