Molecular weight and amino acid composition of glycinin subunits

Glycinin, the major soyabean globulin, is composed of subunits having molecular weights of about 22,300, and 37,200. On the basis of amino acid analysis, the six submits of glycinin isolated by isoelectric focusing are all different. The ‘acidic’ subunits have higher content of glutamic acid and proline, whereas the ‘basic’ subunits are higher in the hydrophobic amino acids leucine, tyrosine, phenylalanine, valine and alanine.