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PSMC5 insufficiency and P320R mutation impair proteasome function

Yu, Zhong-Qiu, Carmichael, Jenny, Collins, Galen A, D'Agostino, Maria Daniela, Lessard, Mathieu, Firth, Helen V., Harijan, Pooja, Fry, Andrew E. ORCID: https://orcid.org/0000-0001-9778-6924, Dean, John, Zhang, Jiuchun, Kini, Usha, Goldberg, Alfred L. and Rubinsztein, David C. 2024. PSMC5 insufficiency and P320R mutation impair proteasome function. Human Molecular Genetics 33 (17) , pp. 1506-1523. 10.1093/hmg/ddae085

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Abstract

The ubiquitin-proteasome system mediates the degradation of a wide variety of proteins. Proteasome dysfunction is associated with neurodegenerative diseases and neurodevelopmental disorders in humans. Here we identified mutations in PSMC5, an AAA ATPase subunit of the proteasome 19S regulatory particle, in individuals with neurodevelopmental disorders, which were initially considered as variants of unknown significance. We have now found heterozygotes with the following mutations: P320R (6 individuals), R325W, Q160A, and one nonsense mutation at Q69. We focused on understanding the functional consequence of PSMC5 insufficiency and the P320R mutation in cells and found that both impair proteasome function and activate apoptosis. Interestingly, the P320R mutation impairs proteasome function by weakening the association between the 19S regulatory particle and the 20S core particle. Our study supports that proteasome dysfunction is the pathogenic cause of neurodevelopmental disorders in individuals carrying PSMC5 variants.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Publisher: Oxford University Press
ISSN: 0964-6906
Date of First Compliant Deposit: 16 August 2024
Date of Acceptance: 8 May 2024
Last Modified: 04 Sep 2024 13:11
URI: https://orca.cardiff.ac.uk/id/eprint/171440

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