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A new method for the preparation of a more efficient, stable iminobiotin-containing resin for the isolation of streptavidin was developed. CL-Sepharose was activated with p-nitrophenyl chloroformate, and the resultant carbonate derivative was reacted with diaminohexane. Subsequent reaction of the amino-containing resin with iminobiotin-N-hydroxysuccinimide ester (in an organic solvent) yielded the stable affinity resin. The capacity of this resin for either avidin or streptavidin was 12 mg per ml resin, and streptavidin could be purified in one step directly from the culture broth of Streptomyces avidinii. The biotin-binding protein isolated in this manner exhibited a major band at about 75 kDa and a minor band at about 150 kDa. Under denaturing conditions, a spectrum of subunit molecular weights ranging between 15 and 19 kDa was detected, the distribution of which depended upon the specific preparation.
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