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. 1981 Sep 1;197(3):695–706. doi: 10.1042/bj1970695

Isolation and partial characterization of two antigenic glycoproteins from rye-grass (Lolium perenne) pollen.

B J Howlett, A E Clarke
PMCID: PMC1163183  PMID: 7325979

Abstract

Two glycoproteins have been purified from a buffer extract of rye-grass (Lolium perenne) pollen. Both migrated as single bands on sodium dodecyl sulphate/polyacrylamide gels. Glycoprotein 1 (0.8 mg/g of pollen) had a apparent mol.wt. of 33 000 and contained 95% protein and 5% carbohydrate. The monosaccharides glucose, galactose, mannose, arabinose and N-acetylglucosamine were present in the proportions 3:3:1:2:1. Glycoprotein 2 (0.4 mg/g of pollen) had an apparent mol. wt. of 68000 and contained 88% protein and 12% carbohydrate. The monosaccharides glucose, galactose, mannose, fucose, xylose, arabinose and N-acetylglucosamine were present in the proportions 4:7:13:5:8:6:6. This glycoprotein bound concanavalin A and Lotus tetragonolobus (asparagus pea) lectin. Radioallergosorbent (RAST) inhibition tests showed that Glycoprotein 1 is an effective allergen, whereas Glycoprotein 2 has less allergenic activity. A method for performing both lectin-binding assays and RAST inhibition tests using microtitre trays is described.

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Selected References

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