Cell chemical biology · 2019
Activation of Caspase-6 Is Promoted by a Mutant Huntingtin Fragment and Blocked by an Allosteric Inhibitor Compound.
СтатьяПоддержка NIH: внешняя программаПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Ehrnhoefer Dagmar E, Skotte Niels H, Reinshagen Jeanette, Qiu Xiaofan, Windshügel Björn, Jaishankar Priyadarshini, Ladha Safia, Petina Olga, Khankischpur Mehdi, Nguyen Yen T N, Caron Nicholas S, Razeto Adelia, Meyer Zu Rheda Matthias, Deng Yu, Huynh Khuong T, Wittig Ilka, Gribbon Philip, Renslo Adam R, Geffken Detlef, Gul Sheraz, Hayden Michael R
Аннотация
Aberrant activation of caspase-6 (C6) in the absence of other hallmarks of apoptosis has been demonstrated in cells and tissues from patients with Huntington disease (HD) and animal models. C6 activity correlates with disease progression in patients with HD and the cleavage of mutant huntingtin (mHTT) protein is thought to strongly contribute to disease pathogenesis. Here we show that the mHTT1-586 fragment generated by C6 cleavage interacts with the zymogen form of the enzyme, stabilizing a conformation that contains an active site and is prone to full activation. This shift toward enhanced activity can be prevented by a small-molecule inhibitor that blocks the interaction between C6 and mHTT1-586. Molecular docking studies suggest that the inhibitor binds an allosteric site in the C6 zymogen. The interaction of mHTT1-586 with C6 may therefore promote a self-reinforcing, feedforward cycle of C6 zymogen activation and mHTT cleavage driving HD pathogenesis.