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Non-proline-dependent protein kinases phosphorylate several sites found in tau from Alzheimer disease brain

Abstract

Of 21 phosphorylation sites identified in PHF-tau 11 are on ser/thr-X motifs and are probably phosphorylated by non-proline-dependent protein kinases (non-PDPKs). The identities of the non-PDPKs and how they interact to hyperphosphorylate PHF-tau are still unclear. In a previous study we have shown that the rate of phosphorylation of human tau 39 by a PDPK (GSK-3) was increased several fold if tau were first prephosphorylated by non-PDPKs (Singh et al., FEBS Lett 358: 267-272, 1995). In this study we have examined how the specificity of a non-PDPK for different sites on human tau 39 is modulated when tau is prephosphorylated by other non-PDPKs (A-kinase, C-kinase, CK-1, CaM kinase II) as well as a PDPK (GSK-3). We found that the rate of phosphorylation of tau 39 by a non-PDPK can be stimulated if tau were first prephosphorylated by other non-PDPKs. Of the four non-PDPKs only CK-1 can phosphorylate sites (thr 231, ser 396, ser 404) known to be present in PHF-tau. Further, these sites were phosphorylated more rapidly and to a greater extent by CK-1 if tau 39 were first prephosphorylated by A-kinase, CaM kinase II or GSK-3. These results suggest that the site specificities of the non-PDPKs that participate in PHF-tau hyperphosphorylation can be modulated at the substrate level by the phosphorylation state of tau.

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Abbreviations

PHF:

paired helical filaments

A-kinase:

cyclic AMP-dependent protein kinase

CaM kinase II:

calcium/calmodulin-dependent protein kinase II

C-kinase:

calcium/phospholipid-dependent protein kinase

CK-1:

casein kinase-1

CK-2:

casein kinase-2

GSK-3:

glycogen synthase kinase-3

MAP kinase:

mitogen-activated protein kinase

PDPK:

proline-dependent protein kinase

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Singh, T.J., Zaidi, T., Grundke-Iqbal, I. et al. Non-proline-dependent protein kinases phosphorylate several sites found in tau from Alzheimer disease brain. Mol Cell Biochem 154, 143–151 (1996). https://doi.org/10.1007/BF00226782

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  • DOI: https://doi.org/10.1007/BF00226782

Key words

  • GSK-3
  • tau protein
  • protein kinases
  • Alzheimer disease
  • paired helical filaments
  • microtubules