title: Phosphorylation sites on tau by tau protein kinase I, a bovine derived kinase generating an epitope of paired helical filaments.
abstract: Tau protein kinase I (TPKI) isolated from bovine brain has been determined to phosphorylate tau at four distinct sites by detecting modified Ser and Thr residues with protein sequencer. Ser199, Thr231, Ser396 and Ser413 were all found to have been phosphorylated by TPKI (numbering of amino acids was done in relation to the longest human tau [Neuron, 3 (1989) 519-526]). These phosphorylations generate an epitope of PHF (paired helical filaments) and eliminate the recognition of tau by the monoclonal antibody, tau-1. These results suggested that TPKI might be responsible for at least some of the phosphorylation of tau to induce PHF formation.
authors.affiliation: Mitsubishi Kasei Institute of Life Sciences, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ishiguro
authors.forename: A
authors.initials: A
authors.lastname: Omori
authors.forename: M
authors.initials: M
authors.lastname: Takamatsu
authors.forename: K
authors.initials: K
authors.lastname: Sato
authors.forename: M
authors.initials: M
authors.lastname: Arioka
authors.forename: T
authors.initials: T
authors.lastname: Uchida
authors.forename: K
authors.initials: K
authors.lastname: Imahori
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D004591:Electrophoresis, Polyacrylamide Gel; D000939:Epitopes / Q000032:analysis; D038362:Glycogen Synthase Kinase 3; D015151:Immunoblotting; D007527:Isoenzymes / Q000378:metabolism*; D007700:Kinetics; D008870:Microtubules / Q000378:metabolism*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010446:Peptide Fragments / Q000302:isolation & purification; D010748:Phosphopeptides / Q000302:isolation & purification; D010766:Phosphorylation; D011494:Protein Kinases / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D014404:Tubulin / Q000378:metabolism*; D016875:tau Proteins / Q000276:immunology / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D000939:Epitopes; D007527:Isoenzymes; D010446:Peptide Fragments; D010748:Phosphopeptides; D014404:Tubulin; D016875:tau Proteins; D011494:Protein Kinases; D017346:Protein Serine-Threonine Kinases; D038362:Glycogen Synthase Kinase 3; C080888:tau-protein kinase