| | |  | | | | Record from Web of Science® | | | | | | |
| Hepatitis B virus pX interacts with HBXAP, a PHD finger protein to coactivate transcription |
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| Author(s): Shamay M, Barak O, Doitsh G, Ben-Dor I, Shaul Y |
| Source: JOURNAL OF BIOLOGICAL CHEMISTRY Volume: 277 Issue: 12 Pages: 9982-9988 Published: MAR 22 2002 |
| Times Cited: 24 References: 46 |
| Abstract: Hepatitis B virus (HBV) gene expression is mainly regulated at the transcription initiation level. The viral X protein (pX) is a transcription coactivator/mediator targeting TFIIB for the recruitment of RNA polymerase II. Here we report a novel pX nuclear target designated HBXAP (hepatitis B virus X-associated protein). HBXAP is a novel cellular nuclear protein containing a PHD (plant homology domain) finger, a domain shared by many proteins that play roles in chromatin remodeling, transcription coactivation, and oncogenesis. pX physically interacts with HBXAP in vitro and in vivo via the HBXAP region containing the PHD finger. At the functional level HBXAP increases HBV transcription in a pX-dependent manner suggesting a role for this interaction in the virus life cycle. Interestingly, HBXAP collaborates with pX in coactivating the transcriptional activator NF-kappaB. Coactivation of NF-kappaB was also observed in tumor necrosis factor alpha-treated cells suggesting that pX-HBXAP functional collaboration localized downstream to the NF-kappaB nuclear import. Collectively our data suggest that pX recruits and potentiates a novel putative transcription coactivator to regulate NF-kappaB. The implication of pX-HBXAP interaction in the development of hepatocellular carcinoma is discussed. |
| Document Type: Article |
| Language: English |
| Reprint Address: Shaul, Y (reprint author), Weizmann Inst Sci, Dept Mol Genet, IL-76100 Rehovot, Israel |
Addresses:
1. Weizmann Inst Sci, Dept Mol Genet, IL-76100 Rehovot, Israel |
| Publisher: AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA |
| Subject Category: Biochemistry & Molecular Biology |
| IDS Number: 533UR |
| ISSN: 0021-9258 |
| DOI: 10.1074/jbc.M111354200 |
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