Abstract
Soybean (Glycine max L.) seeds contain a galactose-binding protein which displays two activities: (a) an α-galactosidase activity and (b) a hemagglutinin activity. The α-galactosidase-hemagglutinin was purified to homogeneity by conventional protein purification procedures and also by affinity chromatography. This protein can be easily separated from soybean agglutinin, the N-acetyl-d-galactosamine-specific lectin in soybean. Further, these two agglutinins show no immunological relatedness. The α-galactosidase-hemagglutinin can be reversibly converted by pH changes from a tetrameric form which displays both enzymic and hemagglutinin activities to a monomeric form which displays enzymic activity only. Although both the monomeric and tetrameric forms are enzymically active, they display different pH optima and carbohydrate specificities.
Full text
PDF



Images in this article
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Hankins C. N., Kindinger J. I., Shannon L. M. Legume Lectins: I. Immunological Cross-Reactions between the Enzymic Lectin from Mung Beans and other Well Characterized Legume Lectins. Plant Physiol. 1979 Jul;64(1):104–107. doi: 10.1104/pp.64.1.104. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hankins C. N., Kindinger J. I., Shannon L. M. Legume alpha-Galactosidases Which Have Hemagglutinin Properties. Plant Physiol. 1980 Apr;65(4):618–622. doi: 10.1104/pp.65.4.618. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hankins C. N., Shannon L. M. The physical and enzymatic properties of a phytohemagglutinin from mung beans. J Biol Chem. 1978 Nov 10;253(21):7791–7797. [PubMed] [Google Scholar]
- Harpaz N., Flowers H. M., Sharon N. alpha-D-galactosidase from soybeans destroying blood-group B antigens. Purification by affinity chromatography and properties. Eur J Biochem. 1977 Jul 15;77(2):419–426. doi: 10.1111/j.1432-1033.1977.tb11682.x. [DOI] [PubMed] [Google Scholar]
- Lis H., Sharon N., Katchalski E. Soybean hemagglutinin, a plant glycoprotein. I. Isolation of a glycopeptide. J Biol Chem. 1966 Feb 10;241(3):684–689. [PubMed] [Google Scholar]
- OUCHTERLONY O. Diffusion-in-gel methods for immunological analysis. Prog Allergy. 1958;5:1–78. [PubMed] [Google Scholar]
- del Campillo E., Shannon L. M., Hankins C. N. Molecular properties of the enzymic phytohemagglutinin of mung bean. J Biol Chem. 1981 Jul 25;256(14):7177–7180. [PubMed] [Google Scholar]