Hepatitis B virus X protein interacts with a probable cellular DNA repair protein.

Abstract:

:The mechanism of action of hepatitis B virus (HBV) X protein in transcriptional transactivation and in tumorigenesis remains obscure. We have used the yeast two-hybrid system to identify a cellular protein that can interact with HBV X protein. This protein, designated X-associated protein 1 (XAP-1), is a human homolog of the UV-damaged DNA-binding protein (UV-DDB) recovered from a monkey cell cDNA library. UV-DDB is presumed to be involved in DNA repair. The interaction between X protein and XAP-1 protein was verified by immunoprecipitation of yeast cell lysates expressing both proteins and by in vitro mixing with X protein expressed as a glutathione S-transferase fusion protein and XAP-1 protein either in HeLa cell extracts or synthesized by in vitro translation. We speculate that the interaction of X protein with a DNA repair protein may recruit cellular proteins to repair the partially double-stranded HBV genome or may modify cellular transcription processes. An effect on the cellular DNA repair system may explain a cofactor role for HBV in liver cancer development.

journal_name

J Virol

journal_title

Journal of virology

authors

Lee TH,Elledge SJ,Butel JS

doi

10.1128/JVI.69.2.1107-1114.1995

subject

Has Abstract

pub_date

1995-02-01 00:00:00

pages

1107-14

issue

2

eissn

0022-538X

issn

1098-5514

journal_volume

69

pub_type

杂志文章