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Virol Sin. 2018 Oct 16. doi: 10.1007/s12250-018-0058-6. [Epub ahead of print]
CypA Regulates AIP4-Mediated M1 Ubiquitination of Influenza A Virus.
Mahesutihan M1,2, Zheng W1, Cui L1,2, Li Y1, Jiao P3, Yang W1,2, Liu W4, Li J1, Fan W1, Yang L1, Liu W5,6, Sun L7,8.
Author information
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.
KEYWORDS:
AIP4; Cyclophilin A (CypA); Influenza A virus (IAV); M1; Ubiquitination
PMID: 30328013 DOI: 10.1007/s12250-018-0058-6
CypA Regulates AIP4-Mediated M1 Ubiquitination of Influenza A Virus.
Mahesutihan M1,2, Zheng W1, Cui L1,2, Li Y1, Jiao P3, Yang W1,2, Liu W4, Li J1, Fan W1, Yang L1, Liu W5,6, Sun L7,8.
Author information
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.
KEYWORDS:
AIP4; Cyclophilin A (CypA); Influenza A virus (IAV); M1; Ubiquitination
PMID: 30328013 DOI: 10.1007/s12250-018-0058-6