title: The cell-wall glycoproteins of the green alga Scenedesmus obliquus. The predominant cell-wall polypeptide of Scenedesmus obliquus is related to the cell-wall glycoprotein gp3 of Chlamydomonas reinhardtii.
abstract: The green alga Scenedesmus obliquus contains a multilayered cell wall, ultrastructurally similar to that of Chlamydomonas reinhardtii, although its proportion of hydroxyproline is considerably lower. Therefore, we have investigated the polypeptide composition of the insoluble and the chaotrope-soluble wall fractions of S. obliquus. The polypeptide pattern of the chaotrope-soluble wall fraction was strongly modified by chemical deglycosylation with anhydrous hydrogen fluoride (HF) in pyridine indicating that most of these polypeptides are glycosylated. Polypeptide constituents of the chaotrope-soluble cell-wall fraction with apparent molecular masses of 240, 270, 265, and 135 kDa cross-reacted with a polyclonal antibody raised against the 100 kDa deglycosylation product of the C. reinhardtii cell-wall glycoprotein GP3B. Chemical deglycosylation of the chaotrope-soluble wall fraction resulted in a 135 kDa major polypeptide and a 106 kDa minor component reacting with the same antibody. This antibody recognized specific peptide epitopes of GP3B. When the insoluble wall fraction of S. obliquus was treated with anhydrous HF/pyridine, three polypeptides with apparent molecular masses of 144, 135, and 65 kDa were solubilized, which also occured in the deglycosylated chaotrope-soluble wall fraction. These findings indicate that theses glycoproteins are cross-linked to the insoluble wall fraction via HF-sensitive bonds.
authors.affiliation: Institute for Biochemistry, Charité - Universitätsmedizin Berlin, D-10117 Berlin, Germany. Electronic address: juergen.voigt@charite.de.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Voigt
authors.affiliation: Department of Pharmacognosy and Phytochemistry, Silesian Medical University, 41-200 Sosnowiec, Poland.
authors.forename: Adam
authors.initials: A
authors.lastname: Stolarczyk
authors.affiliation: Department of Pharmacognosy and Phytochemistry, Silesian Medical University, 41-200 Sosnowiec, Poland.
authors.forename: Maria
authors.initials: M
authors.lastname: Zych
authors.affiliation: Department of Plant Physiology and Biochemistry, Jagiellonian University, 30-387 Kraków, Poland.
authors.forename: Przemysław
authors.initials: P
authors.lastname: Malec
authors.affiliation: Department of Pharmacognosy and Phytochemistry, Silesian Medical University, 41-200 Sosnowiec, Poland; Laboratory of Biotechnology, 43-400 Cieszyn, Poland.
authors.forename: Jan
authors.initials: J
authors.lastname: Burczyk
mesh_terms: D000595:Amino Acid Sequence; D002473:Cell Wall / Q000737:chemistry*; D016825:Chlamydomonas reinhardtii / Q000737:chemistry*; D003432:Cross-Linking Reagents; D006023:Glycoproteins / Q000737:chemistry*; D006031:Glycosylation; D008970:Molecular Weight; D010455:Peptides / Q000737:chemistry*; D044444:Scenedesmus / Q000737:chemistry*; D012995:Solubility
chemical_list: D003432:Cross-Linking Reagents; D006023:Glycoproteins; D010455:Peptides
keywords: Antibodies; Cell wall; Chlamydomonas reinhardtii; Deglycosylation; GP1; GP2; GP3; Glycoproteins; Ig; IgG; PVDF; Scenedesmus obliquus; cell wall glycoprotein number 1 (Chlamydomonas reinhardtii); cell wall glycoprotein number 2 (Chlamydomonas reinhardtii); cell wall glycoprotein number 3 (Chlamydomonas reinhardtii); dGP100; dICW; deglycosylated glycoprotein (final M(r) 100kDa); deglycosylated insoluble cell wall fraction; immunoglobuline; immunoglobuline class G; polyvinylidene fluoride