Proteomics

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Reversible phosphorylation of Rpn1 regulates 26S proteasome assembly and function


ABSTRACT: The fundamental importance of the 26S proteasome in health and disease suggests that its function must be finely controlled, and yet our knowledge about proteasome regulation remains limited. Posttranslational modifications, especially phosphorylation, of proteasome subunits have been shown to impact proteasome function through different mechanisms, although the vast majority of proteasome phosphorylation events have not been studied. Here, we have characterized 1 of the most frequently detected proteasome phosphosites, namely Ser361 of Rpn1, a base subunit of the 19S regulatory particle. Using a variety of approaches including CRISPR/Cas9-mediated gene editing and quantitative mass spectrometry, we found that loss of Rpn1-S361 phosphorylation reduces proteasome activity, impairs cell proliferation, and causes oxidative stress as well as mitochondrial dysfunction. A screen of the human kinome identified several kinases including PIM1/2/3 that catalyze S361 phosphorylation, while its level is reversibly controlled by the proteasome-resident phosphatase, UBLCP1. Mechanistically, Rpn1-S361 phosphorylation is required for proper assembly of the 26S proteasome, and we have utilized a genetic code expansion system to directly demonstrate that S361-phosphorylated Rpn1 more readily forms a precursor complex with Rpt2, 1 of the first steps of 19S base assembly. These findings have revealed a prevalent and biologically important mechanism governing proteasome formation and function.

ORGANISM(S): Homo Sapiens

SUBMITTER: Ping Xu  

PROVIDER: PXD016643 | iProX | Sun Dec 08 00:00:00 GMT 2019

REPOSITORIES: iProX

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Publications

Reversible phosphorylation of Rpn1 regulates 26S proteasome assembly and function.

Liu Xiaoyan X   Xiao Weidi W   Zhang Yanan Y   Wiley Sandra E SE   Zuo Tao T   Zheng Yingying Y   Chen Natalie N   Chen Lu L   Wang Xiaorong X   Zheng Yawen Y   Huang Lan L   Lin Shixian S   Murphy Anne N AN   Dixon Jack E JE   Xu Ping P   Guo Xing X  

Proceedings of the National Academy of Sciences of the United States of America 20191216 1


The fundamental importance of the 26S proteasome in health and disease suggests that its function must be finely controlled, and yet our knowledge about proteasome regulation remains limited. Posttranslational modifications, especially phosphorylation, of proteasome subunits have been shown to impact proteasome function through different mechanisms, although the vast majority of proteasome phosphorylation events have not been studied. Here, we have characterized 1 of the most frequently detected  ...[more]

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