Abstract
Phosphorylation of tau on S(396) was suggested to be a key step in the development of neurofibrillary pathology in Alzheimer's disease brain [Bramblett, G. T., Goedert, M., Jacks, R., Merrick, S. E., Trojanowski, J. Q., and Lee, V. M.-Y. (1993) Neuron 10, 1089-1099]. GSK3beta phosphorylates Ser(396) of tau in the brain by a mechanism which is not clear. In this study, when HEK-293 cells were cotransfected with tau and GSK3beta, GSK3beta co-immunoprecipitated with tau and phosphorylated tau on S(202), T(231), S(396), and S(400) but not on S(262), S(235), and S(404). Blocking phosphorylation on T(231), S(235), S(396), S(400), or S(404) did not prevent the subsequent phosphorylation on S(202) by GSK3beta. These data suggest that GSK3beta directly phosphorylates tau on S(202) (without requiring prephosphorylation). However, preventing phosphorylation on S(235), S(400), and S(404) prevented GSK3beta-dependent phosphorylation of T(231), S(396), and S(400), respectively. This indicates that phosphorylation of T(231), S(396), and S(400) by GSK3beta depends on a previous phosphorylation of S(235), S(400), and S(404), respectively. To examine S(396) phosphorylation, we analyzed phosphorylation of S(396), S(400), and S(404). Blocking phos...Continue Reading
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