title: Purification and characterization of 31-kDa palm pollen glycoprotein (Ela g Bd 31 K), which is recognized by IgE from palm pollinosis patients.
abstract: A basic glycoprotein, which was recognized by IgE from oil palm pollinosis patients, has been purified from oil palm pollen (Elaeis guineensis Jacq.), which is a strong allergen and causes severe pollinosis in Malaysia and Singapore. Soluble proteins were extracted from defatted palm pollen with both Tris-HCl buffer (pH 7.8) and Na-acetate buffer (pH 4.0). The allergenic glycoprotein was purified from the total extract to homogeneity with 0.4% yield by a combination of DEAE- and CM-cellulose, SP-HPLC, and gel filtration. The purified oil palm pollen glycoprotein with molecular mass of 31 kDa was recognized by the beta1-2 xylose specific antibody, suggesting this basic glycoprotein bears plant complex type N-glycan(s). The palm pollen basic glycoprotein, designated Ela g Bd 31 K, was recognized by IgE of palm pollinosis patients, suggesting Ela g Bd 31 K should be one of the palm pollen allergens. The preliminary structural analysis of N-glycans linked to glycoproteins of palm pollens showed that the antigenic N-glycans having alpha1-3 fucose and alpha1-2 xylose residues (GlcNAc(2 to approximately 0)Man3Xyl1Fuc(1 to approximately 0)GlcNAc2) actually occur on the palm pollen glycoproteins, in addition to the high-mannose type structures (Man(9 to approximately 5)GlcNAc2).
authors.affiliation: Department of Bioresources Chemistry, Faculty of Agriculture, Okayama University, Japan. yosh8mar@cc.okayama-u.ac.jp
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Kimura
authors.forename: Megumi
authors.initials: M
authors.lastname: Maeda
authors.forename: Mariko
authors.initials: M
authors.lastname: Kimupa
authors.forename: Oi Ming
authors.initials: OM
authors.lastname: Lai
authors.forename: Siang Hee
authors.initials: SH
authors.lastname: Tan
authors.forename: Sook Mei
authors.initials: SM
authors.lastname: Hon
authors.forename: Fook Tim
authors.initials: FT
authors.lastname: Chew
mesh_terms: D000485:Allergens / Q000737:chemistry* / Q000302:isolation & purification; D028023:Arecaceae / Q000737:chemistry*; D002240:Carbohydrate Sequence; D002850:Chromatography, Gel; D004591:Electrophoresis, Polyacrylamide Gel; D006023:Glycoproteins / Q000737:chemistry* / Q000302:isolation & purification; D006801:Humans; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000737:chemistry*; D010940:Plant Proteins / Q000737:chemistry* / Q000302:isolation & purification; D011058:Pollen / Q000009:adverse effects* / Q000737:chemistry*
chemical_list: D000485:Allergens; D006023:Glycoproteins; D009844:Oligosaccharides; D010940:Plant Proteins