pX, the HBV-encoded coactivator, suppresses the phenotypes of TBP and TAFII250 mutants.

Abstract:

:Hepatitis B virus (HBV) infects humans and causes a wide range of clinical manifestations, from acute hepatitis to hepatocellular carcinoma (HCC). The HBV genome contains multiple promoters with gene expression regulated predominantly by the cellular transcription initiation machinery. Accordingly, the HBV-encoded pX, the only known viral regulator, is a potent transcription coactivator. We investigated the relationship between pX and cellular coactivators. We show that pX restores wild-type activity to inactive TBPAS mutants with poor TAFII250 and activator-binding activity. This pX-mediated recovery, however, is not obtained with inactive TBPAS mutants in binding of other general transcription factors. Remarkably, ts13, a cell line temperature sensitive for TAFII250 function, exhibiting growth arrest and apoptosis at the restrictive temperature, is rescued partially by pX expression, thus generating a pX-dependent cell growth. Collectively, our results suggest that pX suppresses some of the phenotypes of TBP and TAFII250 mutations, implying that pX circumvents the need for a holo-TFIID complex for transcription activation to proceed.

journal_name

Genes Dev

journal_title

Genes & development

authors

Haviv I,Matza Y,Shaul Y

doi

10.1101/gad.12.8.1217

subject

Has Abstract

pub_date

1998-04-15 00:00:00

pages

1217-26

issue

8

eissn

0890-9369

issn

1549-5477

journal_volume

12

pub_type

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