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Effects of FTDP‐17 mutations on the in vitro phosphorylation of tau by glycogen synthase kinase 3β identified by mass spectrometry demonstrate certain mutations exert long‐range conformational changes
Author(s) -
Connell James W,
Gibb Graham M,
Betts Joanna C,
Blackstock Walter P,
Gallo Jean-Marc,
Lovestone Simon,
Hutton Michael,
Anderton Brian H
Publication year - 2001
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(01)02267-0
Subject(s) - phosphopeptide , phosphorylation , gsk 3 , serine , mutant , threonine , chemistry , gsk3b , kinase , glycogen synthase , biochemistry , peptide , tau protein , gene isoform , microbiology and biotechnology , wild type , biology , gene , medicine , disease , pathology , alzheimer's disease
In vitro phosphorylation of recombinant wild‐type 2N4R tau and FTDP‐17 exonic mutant forms P301L, V337M and R406W by glycogen synthase kinase 3β (GSK3β) was examined by two dimensional phosphopeptide mapping analysis on thin layer cellulose plates. Comparison of these peptide maps with those generated from wild‐type 1N4R tau isoform from which the phosphopeptide constituents and sites of phosphorylation had been determined previously, enabled us to monitor directly changes in phosphorylation of the individual tau proteins. No differences were found in the phosphorylation of wild‐type, P301L or V337M tau by GSK3β but the R406W mutant showed at least two clear differences from the other three tau proteins. The peptides, identified by mass spectrometry corresponding to phosphorylation at both threonine 231 and serine 235 (spot 3), serines 396, 400 and 404 (spot 6a) and serines 195 and 199 (spot 6b) were absent from the R406W peptide map. The findings imply that the R406W mutation in tau exerts long‐range conformational effects on the structure of tau.