Purification and characterization of a novel glycoprotein from wheat germ water-soluble extracts

A novel glycoprotein, referred to as WGGP, was isolated from wheat germ water-soluble extracts, and purified by ion-exchange and gel filtration column chromatography. The homogeneity of WGGP was demonstrated by gel filtration on Sepharose CL-6B. The glycoprotein contains 56.4% of protein, rich in glutamic acid, asparagic acid, alanine, glycine, valine and leucine. Mannose accounted for 94% of the neutral sugar moiety, and traces of arabinose, xylose, glucose and galactose were found in WGGP. The molecular weight was estimated to be about 40,000 on SDS-PAGE. The existence of O-glycosidic linkage in WGGP was demonstrated with a β-elimination reaction.