1. 1. An antiserum raised against a 14kDa β-galactoside specific lectin from human brain (HBL14) was used to probe blots from samples of serum and cerebrospinal fluid. The only HBL14-immunoreactive material detected was heavy and light chains of a β-galactoside-binding IgG fraction (lectin-like IgG). 2. 2. Lectin-like IgG, as well as IgG Fab fragments, compete with HBL14 for binding either to anti-HBL14 antibody or to a lactosyl polyacrylamide-based copolymer. 3. 3. Purification of lectin-like IgG was obtained by affinity chromatography on immobilized rabbit anti-lectin immunoglobulins. The carbohydrate-binding specificity of the purified molecules was restricted to β-Gal-containing structures and close to the HBL14 one.
- Soluble lectin Immunoglobulins Affinity chromatography Anti-idiotypes
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