Streptavidin

- Overview
  - The Streptavidin preparation contains an N- and C-terminal shortened variant (core streptavidin) with improved properties concerning homogeneity, solubility, resistance towards proteolytic degradation and accessibility of the biotin binding pocket as compared to native streptavidin. Streptavidin has a molecular weight of 55kDa. 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.
    
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- Properties
  - Source
    
    Bacterium streptomyces avidinii
    
    Type
    
    Recombinant Proteins
    
    Formulation
    
    Lyophilized (1mg/ml) in 50mM NaCl, pH 9.0.
    
    Storage
    
    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.
    
    * For Research Use Only. Not for use in diagnostic/therapeutics procedures.
- Applications
  - Application Description
    
    Gives a clear solution at 5mg/ml in 0.1M NaCl.

Streptavidin

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