Viruses (Apr 2017)

Identifying and Characterizing Interplay between Hepatitis B Virus X Protein and Smc5/6

  • Christine M. Livingston,
  • Dhivya Ramakrishnan,
  • Michel Strubin,
  • Simon P. Fletcher,
  • Rudolf K. Beran

DOI
https://doi.org/10.3390/v9040069
Journal volume & issue
Vol. 9, no. 4
p. 69

Abstract

Read online

Hepatitis B X protein (HBx) plays an essential role in the hepatitis B virus (HBV) replication cycle, but the function of HBx has been elusive until recently. It was recently shown that transcription from the HBV genome (covalently-closed circular DNA, cccDNA) is inhibited by the structural maintenance of chromosome 5/6 complex (Smc5/6), and that a key function of HBx is to redirect the DNA-damage binding protein 1 (DDB1) E3 ubiquitin ligase to target this complex for degradation. By doing so, HBx alleviates transcriptional repression by Smc5/6 and stimulates HBV gene expression. In this review, we discuss in detail how the interplay between HBx and Smc5/6 was identified and characterized. We also discuss what is known regarding the repression of cccDNA transcription by Smc5/6, the timing of HBx expression, and the potential role of HBx in promoting hepatocellular carcinoma (HCC).

Keywords