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The interaction of cellular protein ANP32A with influenza A virus polymerase component PB2 promotes vRNA synthesis

  • Xiuli Wei
  • Zhixin Liu
  • Jingjie Wang
  • Ruiping Yang
  • Jing Yang
  • Yang Guo
  • Huabing Tan
  • Hongying Chen
  • Qiang Liu
  • Long LiuEmail author
Original Article
  • 149 Downloads

Abstract

The subunits PA, PB1, and PB2 of influenza A virus RNA polymerase are essential for efficient viral RNA synthesis and virus replication because of their role in recruiting multiple nuclear proteins. ANP32A is an acidic leucine-rich nuclear phosphoprotein 32 (ANP32) family member and a crucial cellular protein that determines the species specificity of the influenza virus RNA polymerase activity. However, how ANP32A modulates polymerase activity remains largely unknown. In this study, we showed that viral RNA synthesis was increased in A549 cells overexpressing ANP32A and decreased after treatment with ANP32A RNAi. This decrease in RNA synthesis was reversed by rescued ANP32A expression. The results of docking modeling, co-immunoprecipitation, and yeast two-hybrid assays showed that PB2 was the only subunit of the three that interacted with ANP32A. The C-terminal portion of ANP32A and the middle domains (residues 307-534) of PB2 were required for PB2-ANP32A interaction. Glu189 and Glu196 in ANP32A and Gly450 and Gln447 in PB2 were essential for interaction between ANP32A and PB2. These residues were located in conserved regions of the ANP32A or PB2 protein sequences. These data suggest that ANP32A is recruited to the polymerase through direct interaction with PB2 via critical amino acid residue interactions and promotes viral RNA synthesis. Our findings might provide new insights into the molecular mechanisms underlying influenza virus RNA synthesis and replication in infected human cells.

Notes

Funding

This study was funded by the Faculty Development Grants of Hubei University of Medicine (No. 2016QDJZR03), the Natural Science Foundation of Hubei Province (No. 2018CFB185), the Scientific and Technological Project of Shiyan City (No. 17Y32), and Project of Hubei Provincial Department of Education.

Compliance with ethical standards

Conflict of interest

The authors declare that they had no conflict of interest.

Supplementary material

705_2018_4139_MOESM1_ESM.docx (556 kb)
Supplementary material 1 (DOCX 556 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  • Xiuli Wei
    • 1
    • 2
  • Zhixin Liu
    • 1
  • Jingjie Wang
    • 1
  • Ruiping Yang
    • 3
  • Jing Yang
    • 1
  • Yang Guo
    • 1
  • Huabing Tan
    • 2
  • Hongying Chen
    • 4
  • Qiang Liu
    • 5
  • Long Liu
    • 1
    • 2
    Email author
  1. 1.School of Basic Medical SciencesHubei University of MedicineShiyanChina
  2. 2.Department of Infectious Diseases, Renmin HospitalHubei University of MedicineShiyanChina
  3. 3.Biomedical Research InstituteHubei University of MedicineShiyanChina
  4. 4.College of Life SciencesNorthwest A&F UniversityYanglingChina
  5. 5.The First College of Clinical Medical ScienceChina Three Gorges University/Yichang Central People’s HospitalYichangChina

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