Rabies Virus P Protein Interacts with STAT1 and Inhibits Interferon Signal Transduction Pathways

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 2005 Oct 29

PMID 16254375

Citations 105

Authors

Aurore Vidy

Mounira Chelbi-Alix

Danielle Blondel

Affiliations

Soon will be listed here.

Abstract

Rabies virus P protein is a cofactor of RNA polymerase. We investigated other potential roles of P (CVS strain) by searching for cellular partners using two-hybrid screening. We isolated a cDNA encoding the signal transducer and activator of transcription 1 (STAT1) that is a critical component of interferon type I (IFN-alpha/beta) and type II (IFN-gamma) signaling. We confirmed this interaction by glutathione S-transferase-pull-down assay. Deletion mutant analysis indicated that the carboxy-terminal part of P interacted with a region containing the DNA-binding domain and the coiled-coil domain of STAT1. The expression of P protein inhibits IFN-alpha- and IFN-gamma-induced transcriptional responses, thus impairing the IFN-induced antiviral state. Mechanistic studies indicate that P protein does not induce STAT1 degradation and does not interfere with STAT1 phosphorylation but prevents IFN-induced STAT1 nuclear accumulation. These results indicate that rabies P protein overcomes the antiviral response of the infected cells.

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