Protein phosphatase 1 regulates huntingtin exon 1 aggregation and toxicity.

Abstract:

:Huntington's disease is neurodegenerative disorder caused by a polyglutamine expansion in the N-terminal region of the huntingtin protein (N17). Here, we analysed the relative contribution of each phosphorylatable residue in the N17 region (T3, S13 and S16) towards huntingtin exon 1 (HTTex1) oligomerization, aggregation and toxicity in human cells and Drosophila neurons. We used bimolecular fluorescence complementation to show that expression of single phosphomimic mutations completely abolished HTTex1 aggregation in human cells. In Drosophila, mimicking phosphorylation at T3 decreased HTTex1 aggregation both in larvae and adult flies. Interestingly, pharmacological or genetic inhibition of protein phosphatase 1 (PP1) prevented HTTex1 aggregation in both human cells and Drosophila while increasing neurotoxicity in flies. Our findings suggest that PP1 modulates HTTex1 aggregation by regulating phosphorylation on T3. In summary, our study suggests that modulation of HTTex1 single phosphorylation events by PP1 could constitute an efficient and direct molecular target for therapeutic interventions in Huntington's disease.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Branco-Santos J,Herrera F,Poças GM,Pires-Afonso Y,Giorgini F,Domingos PM,Outeiro TF

doi

10.1093/hmg/ddx260

subject

Has Abstract

pub_date

2017-10-01 00:00:00

pages

3763-3775

issue

19

eissn

0964-6906

issn

1460-2083

pii

3932276

journal_volume

26

pub_type

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