Three Cardiovirus Leader Proteins Equivalently Inhibit Four Different Nucleocytoplasmic Trafficking Pathways

Overview

Journal Virology

Specialty Microbiology

Date 2015 Jun 27

PMID 26115166

Citations 19

Authors

Jessica J Ciomperlik

Holly A Basta

Ann C Palmenberg

Affiliations

Soon will be listed here.

Abstract

Cardiovirus infections inhibit nucleocytoplasmic trafficking by Leader protein-induced phosphorylation of Phe/Gly-containing nucleoporins (Nups). Recombinant Leader from encephalomyocarditis virus, Theiler׳s murine encephalomyelitis virus and Saffold virus target the same subset of Nups, including Nup62 and Nup98, but not Nup50. Reporter cell lines with fluorescence mCherry markers for M9, RS and classical SV40 import pathways, as well as the Crm1-mediated export pathway, all responded to transfection with the full panel of Leader proteins, showing consequent cessation of path-specific active import/export. For this to happen, the Nups had to be presented in the context of intact nuclear pores and exposed to cytoplasmic extracts. The Leader phosphorylation cascade was not effective against recombinant Nup proteins. The findings support a model of Leader-dependent Nup phosphorylation with the purpose of disrupting Nup-transportin interactions.

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