Dephosphorylation of YES kinase-mediated co-chaperone DNAJB6b phosphorylation attenuates tau protein aggregation
Lin, M.-C.; Chen, H.-Y.; Lin, T.-S.; Lin, S.-J.; Lin, P.-J.; Liao, C.-Y.; Chan, N.-L.; Lin, C.-H.; Teng, S.-C.
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Alzheimers disease (AD) is a neurodegenerative disorder characterized by a gradual deterioration of memory. Here, we examine the biological consequences of phosphorylation-mediated chaperone activity in AD-associated tau aggregates. Increased phosphorylation of DNAJB6b at Y53 is observed in the brain lysates of AD patients. Our research found that an activated Src family kinase, YES, phosphorylates Y53 within the J-domain of DNAJB6b and enhances the binding between DNAJB6b and Hsp70. The strengthened association between DNAJB6b and Hsp70 may lead to the accumulation of tau aggregates. These findings suggest that the up-regulation of YES kinase modifies DNAJB6b, and that the resulting alteration of DNAJB6b-dependent tau disaggregation may contribute to an increased risk of developing AD. Additionally, phosphor-DNAJB6b at Y53 may serve as a biomarker for the prognosis and diagnosis of AD.
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