title: Protein kinase FA/GSK-3 phosphorylates tau on Ser235-Pro and Ser404-Pro that are abnormally phosphorylated in Alzheimer's disease brain.
abstract: Previously, we identified protein kinase FA/glycogen synthase kinase-3 (GSK-3) as a microtubule-associated protein tau kinase that can incorporate 4 mol of phosphates into 1 mol of tau protein and cause its electrophoretic mobility shift in sodium dodecyl sulfate gels, a unique property characteristic of paired helical filament-associated pathological tau (PHF-tau) in Alzheimer's disease brains. In this report, we identified TPPKS(p)PSAAK and SPVVSGDTS(p)PR as two phosphorylation site sequences phosphorylated by kinase FA/GSK-3 in tau using peptide sequence analysis and sequential manual Edman degradation for radiosequencing. When mapping with human brain tau sequence, we further identified Ser235-Pro and Ser404-Pro as the two major phosphorylation sites according to the numbering of the longest tau isoform. Ser235 and Ser404 have been reported as two of the major abnormal phosphorylation sites in PHF-tau. Taken together, the results provide initial evidence that protein kinase FA/GSK-3 may represent one of the Ser-Pro motif-directed tau kinases involved in the abnormal phosphorylation of pathological PHF-tau in Alzheimer's disease brain.
authors.affiliation: Institute of Biomedical and Life Sciences, National Tsing Hua University, Hsinchu, Taiwan, R.O.C.
authors.forename: S D
authors.initials: SD
authors.lastname: Yang
authors.forename: J S
authors.initials: JS
authors.lastname: Song
authors.forename: J S
authors.initials: JS
authors.lastname: Yu
authors.forename: S G
authors.initials: SG
authors.lastname: Shiah
mesh_terms: D000544:Alzheimer Disease / Q000201:enzymology*; D000595:Amino Acid Sequence; D000818:Animals; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism*; D002417:Cattle; D002846:Chromatography, Affinity; D002851:Chromatography, High Pressure Liquid; D038362:Glycogen Synthase Kinase 3; D008869:Microtubule-Associated Proteins / Q000378:metabolism*; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry / Q000302:isolation & purification; D010449:Peptide Mapping; D010748:Phosphopeptides / Q000737:chemistry / Q000302:isolation & purification; D010766:Phosphorylation; D011392:Proline; D012694:Serine; D016875:tau Proteins / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D008869:Microtubule-Associated Proteins; D010446:Peptide Fragments; D010748:Phosphopeptides; D016875:tau Proteins; D012694:Serine; D011392:Proline; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D038362:Glycogen Synthase Kinase 3