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TIMM29 interacts with hepatitis B virus preS1 to modulate the HBV life cycle. | LitMetric

TIMM29 interacts with hepatitis B virus preS1 to modulate the HBV life cycle.

Microbiol Immunol

Division of Virology, Department of Microbiology and Immunology, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka, 565-0871, Japan.

Published: December 2020

AI Article Synopsis

  • Hepatitis B virus (HBV) is a significant global health concern, leading to severe liver-related diseases, and understanding its life cycle is essential for effective control.
  • The study identified TIMM29, a protein in the mitochondrial membrane, as a partner that interacts with the preS1 region of the HBV large S protein, confirmed through various assays and colocalization studies.
  • Findings revealed that TIMM29's presence reduces HBV production, while its absence increases HBV levels, indicating TIMM29's role in modulating HBV amplification.

Article Abstract

Hepatitis B virus (HBV), a major global health problem, can cause chronic hepatitis, liver cirrhosis, and hepatocellular carcinomas in chronically infected patients. However, before HBV infection can be adequately controlled, many mysteries about the HBV life cycle must be solved. In this study, TIMM29, an inner mitochondrial membrane protein, was identified as an interaction partner of the preS1 region of the HBV large S protein. The interaction was verified by both an immunoprecipitation with preS1 peptides and a GST-pulldown assay. Immunofluorescence studies also showed colocalization of preS1 and TIMM29. Moreover, it was determined that the preS1 bound with amino acids 92-189 of the TIMM29 protein. Infection of HBV in TIMM29-overexpressing NTCP/G2 cells resulted in a significant decrease of HBeAg and both extracellular particle-associated and core particle-associated HBV DNA without affecting cccDNA formation. Comparable results were obtained with TIMM29-overexpressing HB611 cells, which constitutively produce HBV. In contrast, knockout of TIMM29 in NTCP/G2 cells led to a higher production of HBV including HBeAg expression, as did knockout of TIMM29 in HB611. Collectively, these results suggested that TIMM29 interacts with the preS1 region of the HBV large S protein and modulates HBV amplification.

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Source
http://dx.doi.org/10.1111/1348-0421.12852DOI Listing

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