Pin1 cysteine-113 oxidation inhibits its catalytic activity and cellular function in Alzheimer's disease

Neurobiology of Disease

Kun Ping Lu¹  Yan Zhang²  D. Allan Butterfield³  Rukhsana Sultana³  Aaron M. Swomley³  Asami Kondo⁴  Chun-Hau Chen⁴  Mi-Hyeon You⁴  Koorosh Shahpasand⁴  Man-Li Luo⁴  Tae Ho Lee⁴  Xiao Zhen Zhou⁴  Morris Nechama⁴  Yandan Yao⁴  Byeong Mo Kim⁴  Yu-Min Lin⁴  Wenzong Li⁵ 

[1] Center of Membrane Sciences, University of Kentucky, Lexington, KY 40506, USA;Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY 40506, USA;Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA;Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA;Dept. of Molecular Biosciences and Institute for Cellular and Molecular Biology, University of Texas, Austin, TX 78712, USA;

关键词: Alzheimer's disease;    Pin1;    Oxidation;    Tau;    APP;   

DOI  :  

来源: DOAJ

【 摘 要 】

The unique proline isomerase Pin1 is pivotal for protecting against age-dependent neurodegeneration in Alzheimer's disease (AD), with its inhibition providing a molecular link between tangle and plaque pathologies. Pin1 is oxidatively modified in human AD brains, but little is known about its regulatory mechanisms and pathological significance of such Pin1 modification. In this paper, our determination of crystal structures of oxidized Pin1 reveals a series of Pin1 oxidative modifications on Cys113 in a sequential fashion. Cys113 oxidization is further confirmed by generating antibodies specifically recognizing oxidized Cys113 of Pin1. Furthermore, Pin1 oxidation on Cys113 inactivates its catalytic activity in vitro, and Ala point substitution of Cys113 inactivates the ability of Pin1 to isomerize tau as well as to promote protein turnover of tau and APP. Moreover, redox regulation affects Pin1 subcellular localization and Pin1-mediated neuronal survival in response to hypoxia treatment. Importantly, Cys113-oxidized Pin1 is significantly increased in human AD brain comparing to age-matched controls. These results not only identify a novel Pin1 oxidation site to be the critical catalytic residue Cys113, but also provide a novel oxidative regulation mechanism for inhibiting Pin1 activity in AD. These results suggest that preventing Pin1 oxidization might help to reduce the risk of AD.

【 授权许可】

Unknown