Abstract
A hemagglutinin specific for blood group B antigen has been purified to 190-fold from the culture fluid of a strain of Streptomyces sp. by conventional procedure involving ammonium sulfate fractionation and column chromatography. The molecular weight of the partially purified preparation was estimated to be approximately 5000±1000; this value is extremely small as compared with those of hemagglutinins which have been so far isolated from various sources. Hemagglutination-inhibition tests revealed that the Streptomyces agglutinin has a specificity to combine with D-galactose and several saccharides having D-galactose residues at the non-reducing terminal, and that the special configuration of the hydroxyl groups at C-2 and C-4, particularly the hydroxyl group at C-2, is essential for binding of the sugars to the hemagglutinin.
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