title: The adhesive protein of Choromytilus chorus (Molina, 1782) and Aulacomya ater (Molina, 1782): a proline-rich and a glycine-rich polyphenolic protein.
abstract: The adhesive polyphenolic proteins from Aulacomya ater and Choromytilus chorus with apparent molecular masses of 135000 and 105000, respectively, were digested with trypsin and the peptides produced resolved by reversed phase liquid chromatography. About 5 and 12 major peptides were obtained from the protein of A. ater and C. chorus, respectively. The major peptides were purified by reverse-phase chromatography and the amino acid sequence indicates that both polyphenolic proteins consisted of repeated sequence motifs in their primary structure. The major peptides of A. ater contain seven amino acids corresponding to the consensus sequence AGYGGXK, whereas the tyrosine was always found as 3, 4-dihydroxyphenylalanine (Dopa), the X residue in position 6 was either valine, leucine or isoleucine, and the carboxy terminal was either lysine or hydroxylysine. On the other hand, the major peptides of C. chorus ranged in size from 6 to 21 amino acids and the majority correspond to the consensus sequence AKPSKYPTGYKPPVK. Both proteins differ markedly in the sequence of their tryptic peptides, but they share the common characteristics of other adhesive proteins in having a tandem sequence repeat in their primary structure.
authors.affiliation: BiosChile Ingenieria Genética S.A., Santiago, Chile.
authors.forename: L A
authors.initials: LA
authors.lastname: Burzio
authors.forename: C
authors.initials: C
authors.lastname: Saéz
authors.forename: J
authors.initials: J
authors.lastname: Pardo
authors.forename: J H
authors.initials: JH
authors.lastname: Waite
authors.forename: L O
authors.initials: LO
authors.lastname: Burzio
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D049872:Bivalvia; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D005998:Glycine / Q000737:chemistry*; D008969:Molecular Sequence Data; D010449:Peptide Mapping; D011392:Proline / Q000737:chemistry*; D011506:Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D013045:Species Specificity; D014357:Trypsin / Q000737:chemistry
chemical_list: D011506:Proteins; C037403:adhesive protein, mussel; D011392:Proline; D014357:Trypsin; D005998:Glycine