Differential reactivity of Agaricus bisporus lectin with human IgA subclasses in gel precipitation
F J Irazoqui1, F E Zalazar, G A Chiabrando
1Departamento de Bioquimica Clinica, Facultad de Ciencias Quimicas, Universidad Nacional de Córdoba, Argentina.
Insights
Agaricus bisporus lectin (ABL) interacts with human IgA1 and IgD proteins. This lectin shows potential as a tool for distinguishing and isolating human IgA subclasses.
Area of Science:
- Immunology
- Biochemistry
Background:
- Lectins are proteins with specific carbohydrate-binding properties.
- Agaricus bisporus lectin (ABL) is a well-characterized lectin derived from the common mushroom.
Purpose of the Study:
- To investigate the interaction between purified Agaricus bisporus lectin (ABL) and various human proteins.
- To evaluate the potential of ABL as a tool for differentiating human immunoglobulin A (IgA) subclasses.
Main Methods:
- Ouchterlony double diffusion
- Immunoelectrophoresis
- Hemagglutination inhibition assays
Main Results:
- ABL formed a precipitation line with normal human serum, normal human colostrum, IgA1 myeloma serum, serum monoclonal IgA1, secretory IgA1, and monoclonal IgD.
- No reaction was observed between ABL and monoclonal IgA2, secretory IgA2, IgG, IgM, alpha 2 macroglobulin, or pregnancy-associated alpha 2 glycoprotein.
- Hemagglutination inhibition assays confirmed the reactivity patterns for IgA1, IgA2, and IgD.
Conclusions:
- Agaricus bisporus lectin (ABL) exhibits specific binding to human IgA1 and IgD.
- ABL can be utilized as a valuable reagent for the distinction and isolation of human IgA subclasses.
Abstract:
The interaction between purified Agaricus bisporus lectin and several human proteins was studied using the Ouchterlony double diffusion and immunoelectrophoresis techniques. Only one precipitation line was observed with normal human serum, normal human colostrum, IgA1 myeloma serum, both serum monoclonal and secretory IgA1 and monoclonal IgD. No reaction was observed with monoclonal and secretory IgA2, IgG, IgM, alpha 2 macroglobulin or pregnancy-associated alpha 2 glycoprotein. These results were confirmed by hemagglutination inhibition assays when IgA1, IgA2 and IgD were tested. On the basis of this reactivity, ABL could be a useful tool for distinguishing and isolating human IgA subclasses.
