Trisaccharide, having blood group H activity, was obtained from H substance. When the H-active trisaccharide was acted on by the enzyme (α-L-fucosidase) from
Bac. Fulminans, fucose was liberated from it, thus losing its H activity and being reduced in the antigenicity common to
Sh. dysenteriae, but retaining that common to
D. pneumoniae Type XIV. The trisaccharide was split by the enzymes (α-L-fucosidase and β-D-galactosidase) from
Bac. cereus H into the component sugars.
When the enzyme (α-(1→2)-L-fucosidase) from
Bac. fulminans was applied on a Le
b-active oligosaccharide, fucose was liberated from it, and Le
b-activity was lost to be replaced by Le
a-activity.
A weak Le
a-active trisaccharide obtained from Le
a substance was decomposed by the enzymes from
Bac. cereus Le
a into monosaccharides, fucose, galactose and
N-acetylglucosamine.
View full abstract