Synthetic chaperone based on Hsp90-Tau interaction inhibits pathological Tau aggregation and rescues physiological Tau-Microtubule interaction

Abstract

The accumulation of intracellular aggregates of Tau protein is one main hallmark of Alzheimers disease (AD) and is the consequence of Tau conformational changes, increased phosphorylation, and self-association to form fibrillar aggregates. This pathological process prevents the physiological interaction of Tau with microtubules to the detriment of the structural integrity of neurons. In healthy cells, aberrant protein misfolding and aggregation are counteracted by chaperone proteins whose protective capacity decreases with age. The role of the chaperone Hsp90 and the mechanism by which it can prevent Tau aggregation toxicity are controversial. The innovative strategy of mimicking Hsp90 through the design of the {beta}-hairpin like peptidomimetic {beta}-Hsp90, inspired by two Hsp90/Tau interaction sequences, is presented here. {beta}-Hsp90 inhibits Tau aggregation both in vitro and in cells, restoring Taus physiological interaction with microtubules. {beta}-Hsp90, which interacts with the P1 region of Tau, is more effective than individual peptide sequences from the chaperone HSP90 and another {beta}-hairpin mimic based on Tau sequences. Moreover, {beta}-Hsp90 dramatically reduces AD-associated A{beta}1-42 aggregation, offering the development of a dual inhibitor. This work paves the way for the design of new drugs targeting devastating untreated amyloid diseases, by mimicking physiological chaperones with small synthetic peptide drugs.