Adeno-associated virus Rep78 protein inhibits Hepatitis B virus replication through regulation of the HBV core promoter

Biochem Biophys Res Commun. 2009 Jul 17;385(1):106-11. doi: 10.1016/j.bbrc.2009.04.132. Epub 2009 May 3.


Rep78, the rep gene product of adeno-associated virus (AAV), has been shown to inhibit the replication of several DNA viruses. This study investigated the effects of Rep78 on replication of Hepatitis B virus (HBV) and possible mechanisms of inhibition. We have shown that HBV DNA replication and secretion of HBsAg and HBeAg in HepG2 2.2.15 cells were inhibited by Rep78. We have also demonstrated, using in vitro transcription and luciferase assay, that Rep78 binds to the HBV core promoter (HBV CP) and inhibits HBV CP activity. Furthermore, after Rep78 and HBV core protein expression plasmids were co-transfected into HepG2 cells, the expression of HBV core protein was inhibited significantly. These results suggest that Rep78 can inhibit the replication of HBV, correlating strongly with suppression of HBV CP activity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line
  • DNA-Binding Proteins / genetics
  • DNA-Binding Proteins / metabolism*
  • Gene Expression Regulation, Viral*
  • Hepatitis B Antigens / metabolism
  • Hepatitis B virus / genetics
  • Hepatitis B virus / physiology*
  • Humans
  • Viral Core Proteins / genetics*
  • Viral Proteins / genetics
  • Viral Proteins / metabolism*
  • Virus Replication* / genetics


  • DNA-Binding Proteins
  • Hepatitis B Antigens
  • Viral Core Proteins
  • Viral Proteins
  • rep proteins, Adeno-associated virus 2