CypA Regulates AIP4-Mediated M1 Ubiquitination of Influenza A Virus

Overview

Journal Virol Sin

Specialty Microbiology

Date 2018 Oct 18

PMID 30328013

Citations 12

Authors

Madina Mahesutihan

Weinan Zheng

Liang Cui

Yun Li

Pengtao Jiao

Wenxian Yang

Wei Liu

Jing Li

Wenhui Fan

Limin Yang

Wenjun Liu

Lei Sun

Affiliations

Soon will be listed here.

Abstract

Cyclophilin A (CypA) is a peptidyl-prolyl cis/trans isomerase that interacts with the matrix protein (M1) of influenza A virus (IAV) and restricts virus replication by regulating the ubiquitin-proteasome-mediated degradation of M1. However, the mechanism by which CypA regulates M1 ubiquitination remains unknown. In this study, we reported that E3 ubiquitin ligase AIP4 promoted K48-linked ubiquitination of M1 at K102 and K104, and accelerated ubiquitin-proteasome-mediated degradation of M1. The recombinant IAV with mutant M1 (K102R/K104R) could not be rescued, suggesting that the ubiquitination of M1 at K102/K104 was essential for IAV replication. Furthermore, CypA inhibited AIP4-mediated M1 ubiquitination by impairing the interaction between AIP4 and M1. More importantly, both the mutations of M1 (K102R/K104R) and CypA inhibited the nuclear export of M1, indicating that CypA regulates the cellular localization of M1 via inhibition of AIP4-mediated M1 ubiquitination at K102 and K104, which results in the reduced replication of IAV. Collectively, our findings reveal a novel ubiquitination-based mechanism by which CypA regulates the replication of IAV.

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