Streptavidin

Streptavidin

CATALOGUE NUMBER

PRO-283

INTRODUCTION

Streptavidin is a tetrameric protein secreted by Streptomyces avidinii which binds firmly to biotin. Streptavidin is wilyde used in molecular biology through its unique high affinity for the vitamin biotin. The dissociation constant (Kd) of the biotin-streptavidin complex is about ~10-15 mol/L. The strong affinity recognition of biotin and biotinylated molecules has made streptavidin one of the most important components in diagnostics and laboratory kits. The streptavidin/biotin system has one of the biggest free energies of association of yet observed for noncovalent binding of a protein and small ligand in aqueous solution (K_assoc = 10**14). The complexes are also extremely stable over a wide range of temperature and pH.

DESCRIPTION

Streptavidin is a protein produced by Streptomyces avidinii and isolated by purification from fermentation broth. The pure, homogeneous protein shows predominantly one single band in SDS PAGE. Streptavidin consists of 4 identical subunits, each bearing an active binding site for biotin. Streptavidin has a molecular weight of 55kDa.

SOURCE

Bacterium Streptomyces avidinii.

PHYSICAL APPEARANCE

Sterile Filtered lyophilized powder.

FORMULATION

Lyophilized (1mg/ml) in 50mM NaCl, pH 9.0.

SOLUBILITY

Gives a clear solution at 5mg/ml in 0.1M NaCl.

STABILITY

Streptavidin although stable at 4°C for 3 weeks, should be stored desiccated below -18°C. 
For longer storage in dissolved form add 1mM EDTA and/or 0.02 % NaN3 or pass the solution through a sterile filter.
Please prevent freeze-thaw cycles.

SPECIFIC ACTIVITY

Greater than 18.2U/mg, 1 unit binds 1µg biotin.

USAGE

ProSpec's products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.