Mitochondrial ATP synthase activity is impaired by suppressed O-GlcNAcylation in Alzheimer's disease.

Abstract:

:Glycosylation with O-linked β-N-acetylglucosamine (O-GlcNAc) is one of the protein glycosylations affecting various intracellular events. However, the role of O-GlcNAcylation in neurodegenerative diseases such as Alzheimer's disease (AD) is poorly understood. Mitochondrial adenosine 5'-triphosphate (ATP) synthase is a multiprotein complex that synthesizes ATP from ADP and Pi. Here, we found that ATP synthase subunit α (ATP5A) was O-GlcNAcylated at Thr432 and ATP5A O-GlcNAcylation was decreased in the brains of AD patients and transgenic mouse model, as well as Aβ-treated cells. Indeed, Aβ bound to ATP synthase directly and reduced the O-GlcNAcylation of ATP5A by inhibition of direct interaction between ATP5A and mitochondrial O-GlcNAc transferase, resulting in decreased ATP production and ATPase activity. Furthermore, treatment of O-GlcNAcase inhibitor rescued the Aβ-induced impairment in ATP production and ATPase activity. These results indicate that Aβ-mediated reduction of ATP synthase activity in AD pathology results from direct binding between Aβ and ATP synthase and inhibition of O-GlcNAcylation of Thr432 residue on ATP5A.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Cha MY,Cho HJ,Kim C,Jung YO,Kang MJ,Murray ME,Hong HS,Choi YJ,Choi H,Kim DK,Choi H,Kim J,Dickson DW,Song HK,Cho JW,Yi EC,Kim J,Jin SM,Mook-Jung I

doi

10.1093/hmg/ddv358

subject

Has Abstract

pub_date

2015-11-15 00:00:00

pages

6492-504

issue

22

eissn

0964-6906

issn

1460-2083

pii

ddv358

journal_volume

24

pub_type

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