Full-length and truncated versions of the hepatitis B virus (HBV) X protein (pX) transactivate the cMYC protooncogene at the transcriptional level

Clara Balsano, Maria Laura Avantaggiati, Gioacchino Natoli, Elisabetta De Marzio, Hans Will, Michel Perricaudet, Massimo Levrero

Research output: Contribution to journalArticle


The products of the human hepatitis B virus (HBV) and woodchuck hepatitis B virus X genes (pXs) transactivate homologous and heterologous genes including the HBV-X and core promoters, the human immunodeficiency viruses 1 (HIV-1) and 2 (HIV-2) long terminal repeats and the beta interferon regulatory sequences. We report here that pX is also able to influence the expression of both extrachromosomal transfected c-myc regulatory sequences and endogenous c-myc gene. pX acts by increasing transcription of the c-myc gene and do not affect c-myc mRNAs stability. The presence of the first AUG of the X-ORFs is indeed necessary for the production of an active pX. The very carboxyterminus of the pX protein is dispensable for this transactivating activity and at least one domain important for its action is located between aminoacids 103 and 117.

Original languageEnglish
Pages (from-to)985-992
Number of pages8
JournalBiochemical and Biophysical Research Communications
Issue number3
Publication statusPublished - May 15 1991


ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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