The Enteropathogenic E. coli Effector EspF Targets and Disrupts the Nucleolus by a Process Regulated by Mitochondrial Dysfunction

PLoS Pathogens

Jon A. Scott¹  Brendan Kenny¹  Nicholas J. Watkins¹  Paul Dean¹  Andrew A. Knox¹  Sabine Quitard¹ 

[1] Institute for Cell and Molecular Biosciences, Medical School, University of Newcastle, Newcastle upon Tyne, United Kingdom

关键词: Nucleolus;    HeLa cells;    Host cells;    Bacterial pathogens;    Mitochondria;    Cytoplasm;    Cell staining;    Cytoplasmic staining;   

DOI  :  10.1371/journal.ppat.1000961

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

The nucleolus is a multifunctional structure within the nucleus of eukaryotic cells and is the primary site of ribosome biogenesis. Almost all viruses target and disrupt the nucleolus—a feature exclusive to this pathogen group. Here, using a combination of bio-imaging, genetic and biochemical analyses, we demonstrate that the enteropathogenic E. coli (EPEC) effector protein EspF specifically targets the nucleolus and disrupts a subset of nucleolar factors. Driven by a defined N-terminal nucleolar targeting domain, EspF causes the complete loss from the nucleolus of nucleolin, the most abundant nucleolar protein. We also show that other bacterial species disrupt the nucleolus, dependent on their ability to deliver effector proteins into the host cell. Moreover, we uncover a novel regulatory mechanism whereby nucleolar targeting by EspF is strictly controlled by EPEC's manipulation of host mitochondria. Collectively, this work reveals that the nucleolus may be a common feature of bacterial pathogenesis and demonstrates that a bacterial pathogen has evolved a highly sophisticated mechanism to enable spatio-temporal control over its virulence proteins.

【 授权许可】

CC BY