A novel lectin in rabbit serum binds H type 1, H type 2 and N-acetyl lactosamine structures.

A novel lectin (RSL) which recognizes blood group H type 1 and type 2 (Fuc alpha 1-->2Gal beta 1-->3/4GlcNAc beta-R), and N-acetyllactosamine (Gal beta 1-->4GlcNAc beta-R) was purified from rabbit serum using affinity chromatography on Synsorb H type 2 beads, gel filtration and preparative polyacrylamide gel electrophoresis. The lectin agglutinated human O type red cells, and the hemagglutination reaction was inhibited by H type 1 and type 2 haptens, N-acetyllactosamine and human salivas from secretor individuals. The molecular weight of the lectin was estimated to be approximate 650,000 and 65,000 on Sephacryl S-400 gel filtration and SDS-polyacrylamide gel electrophoresis, respectively.