The affinity of the sample streptavidine biotine has been engineered in order to lower the affinity. One part can be attached to your gene of interest and express fused to the protein, while the other part will be linked chemically to a solid phase for separation.
Strep-tag® characteristics:
buffer high variability: high salts, detergents, metal ions, chelators or reducing agents
a short tag
low Kd value (10-7) allowing simple and gentle separation using a competitor
low pressure
HPLC columns available
Strep-tag® products have also numerous advantages:
high protein purity: >95% under physiological conditions
high specificity
physiological and fast purification with low background
allows isolation of bioactive proteins, metalloproteins and protein complexes
high-performance tool for protein:protein interaction studies
efficient protein immobilization
no influence on protein folding and function
low immunogenicity
re-usable resins
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