Pooled RNAi Screen Identifies Ubiquitin Ligase Itch As Crucial for Influenza A Virus Release from the Endosome During Virus Entry

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2013 Oct 9

PMID 24101521

Citations 79

Authors

Wen-Chi Su

Yung-Chia Chen

Chung-Hsin Tseng

Paul Wei-Che Hsu

Kuo-Feng Tung

King-Song Jeng

Michael M C Lai

Affiliations

Soon will be listed here.

Abstract

Influenza viruses, like other viruses, rely on host factors to support their life cycle as viral proteins usually "hijack," or collaborate with, cellular proteins to execute their functions. Identification and understanding of these factors can increase the knowledge of molecular mechanisms manipulated by the viruses and facilitate development of antiviral drugs. To this end, we developed a unique genome-wide pooled shRNA screen to search for cellular factors important for influenza A virus (IAV) replication. We identified an E3 ubiquitin ligase, Itch, as an essential factor for an early step in the viral life cycle. In Itch knockdown cells, the incorporation of viral ribonucleoprotein complex into endosomes was normal, but its subsequent release from endosomes and transport to the nucleus was retarded. In addition, upon virus infection, Itch was phosphorylated and recruited to the endosomes, where virus particles were located. Furthermore, Itch interacted with viral M1 protein and ubiquitinated M1 protein. Collectively, our findings unravel a critical role of Itch in mediating IAV release from the endosome and offer insights into the mechanism for IAV uncoating during virus entry. These findings also highlight the feasibility of pooled RNAi screening for exploring the cellular cofactors of lytic viruses.

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