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. 1997 May 1;323(Pt 3):741–747. doi: 10.1042/bj3230741

Phosphorylation of tau by glycogen synthase kinase 3beta affects the ability of tau to promote microtubule self-assembly.

M A Utton 1, A Vandecandelaere 1, U Wagner 1, C H Reynolds 1, G M Gibb 1, C C Miller 1, P M Bayley 1, B H Anderton 1
PMCID: PMC1218378  PMID: 9169608

Abstract

To study the effects of phosphorylation by glycogen synthase kinase-3beta (GSK-3beta) on the ability of the microtubule-associated protein tau to promote microtubule self-assembly, tau isoform 1 (foetal tau) and three mutant forms of this tau isoform were investigated. The three mutant forms of tau had the following serine residues, known to be phosphorylated by GSK-3, replaced with alanine residues so as to preclude their phosphorylation: (1) Ser-199 and Ser-202 (Ser-199/202-->Ala), (2) Ser-235 (Ser-235-->Ala) and (3) Ser-396 and Ser-404 (Ser-396/404-->Ala). Wild-type tau and the mutant forms of tau were phosphorylated with GSK-3beta, and their ability to promote microtubule self-assembly was compared with the corresponding non-phosphorylated tau species. In the non-phosphorylated form, wild-type tau and all of the mutants affected the mean microtubule length and number concentrations of assembled microtubules in a manner consistant with enhanced microtubule nucleation. Phosphorylation of these tau species with GSK-3beta consistently reduced the ability of a given tau species to promote microtubule self-assembly, although the affinity of the tau for the microtubules was not greatly affected by phosphorylation since the tau species remained largely associated with the microtubules. This suggests that the regulation of microtubule assembly can be controlled by phosphorylation of tau at sites accessible to GSK-3beta by a mechanism that does not necessarily involve the dissociation of tau from the microtubules.

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Selected References

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