AAM-B interacts with nonstructural 4B and regulates hepatitis C virus propagation

Eun Mee Park, Yun Sook Lim, Byung Yoon Ahn, Soon B. Hwang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Hepatitis C virus (HCV) usurps host cellular lipid metabolism for production of infectious virus particles. Recently, we have screened a siRNA library targeting host factors that control lipid metabolism and lipid droplet (LD) formation in cell culture grown HCV (HCVcc)- infected cells. Of 10 final candidates, we selected the gene encoding AAM-B for further characterization. We showed that siRNA-mediated knockdown of AAM-B impaired HCV propagation in Jc1-infected cells. More precisely, knockdown of AAM-B abrogated production of infectious HCV particles in both Jc1 RNA electroporated cells and Jc1-infected cells. It is worth noting that knockdown of AAM-B exerted no effect on lipid droplet formation. Moreover, AAM-B interacted with nonstructural 4B (NS4B) through the C-terminal region of NS4B. Protein interplay between AAM-B and NS4B was verified in the context of HCV replication. Using either transient or stable expression of AAM-B, we verified that AAM-B colocalized with NS4B in the cytoplasm. Immunofluorescence data further showed that AAM-B might be involved in recruitment of NS4B to sites in close proximity to LDs to facilitate HCV propagation. Collectively, this study provides new insight into how HCV utilizes cellular AAM-B to facilitate viral propagation.

Original languageEnglish
Article number132839
JournalPloS one
Issue number7
Publication statusPublished - 2015 Jul 17

Bibliographical note

Publisher Copyright:
Copyright: © 2015 Park et al.This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

ASJC Scopus subject areas

  • General Biochemistry,Genetics and Molecular Biology
  • General Agricultural and Biological Sciences
  • General


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