TIMM29 interacts with hepatitis B virus preS1 to modulate the HBV life cycle
Nelly Gakii Muriungi 1, Keiji Ueda 1
Affiliations
Affiliation
1
Division of Virology, Department of Microbiology and Immunology, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka, 565-0871, Japan.
PMID: 32970362 DOI: 10.1111/1348-0421.12852
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, we identified TIMM29, an inner mitochondrial membrane protein, 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, we 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 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. This article is protected by copyright. All rights reserved.
Keywords: Hepatitis B virus; TIMM29; intrinsic immunity; mitochondria; preS1.
This article is protected by copyright. All rights reserved.作者: StephenW 时间: 2020-9-25 18:33