Abstract
Phosphorylation of tau protein is regulated by several kinases, especially glycogen synthase kinase 3beta (GSK-3beta), cyclin-dependent protein kinase 5 (cdk5) and cAMP-dependent protein kinase (PKA). Phosphorylation of tau by PKA primes it for phosphorylation by GSK-3beta, but the site-specific modulation of GSK-3beta-catalyzed tau phosphorylation by the prephosphorylation has not been well investigated. Here, we found that prephosphorylation by PKA promotes GSK-3beta-catalyzed tau phosphorylation at Thr181, Ser199, Ser202, Thr205, Thr217, Thr231, Ser396 and Ser422, but inhibits its phosphorylation at Thr212 and Ser404. In contrast, the prephosphorylation had no significant effect on its subsequent phosphorylation by cdk5 at Thr181, Ser199, Thr205, Thr231 and Ser422; inhibited it at Ser202, Thr212, Thr217 and Ser404; and slightly promoted it at Ser396. These studies reveal the nature of the inter-regulation of tau phosphorylation by the three major tau kinases.
MeSH Terms
Amino Acids
Catalysis
Cyclic AMP-Dependent Protein Kinases/physiology
Cyclin-Dependent Kinase 5/metabolism
Glycogen Synthase Kinase 3/metabolism
Glycogen Synthase Kinase 3 beta
Humans
Phosphorylation
tau Proteins/metabolism
Chemicals
Amino Acids
tau Proteins
Cyclin-Dependent Kinase 5
GSK3B protein, human
Glycogen Synthase Kinase 3 beta
Cyclic AMP-Dependent Protein Kinases
Glycogen Synthase Kinase 3
Authors & Affiliations
8 authors, click to expand affiliations / ORCID
Liu Fei
Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, 1050 Forest Hill Road, Staten Island, NY 10314, USA. feiliu63@hotmail.com
Liang Zhihou
Shi Jianhua
Yin Dongmei
El-Akkad Ezzat
Grundke-Iqbal Inge
Iqbal Khalid
Gong Cheng-Xin
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