Subcellular localization of HCV core protein regulates its ability for p53 activation and p21 suppression 丙型肝炎病毒核心蛋白的亚细胞定位调节其p53激活和p21抑制能力.pdf
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BBRC
Biochemical and Biophysical Research Communications 294 (2 2) 528–534
Subcellular localization of HCV core protein regulates its ability
for p53 activation and p21 suppression
Takayuki Yamanaka,a Tatsuhiko Kodama,b and Takefumi Doia,*
a Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
b Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan
Received 15 April 2 2
Abstract
Hepatitis C Virus (HCV) is a single stranded RNA virus causing non-A and non-B hepatitis. Core protein is a viral capsid protein
that plays an important role in the pathogenesis of HCV. The companion report revealed that an innate form (amino acids [a.a.]
1–191) regulated subcellular localization of a mature form (a.a. 1–173). It was also shown that the innate form in the cytoplasm
enhanced the p21 expression and the mature form in the nucleus suppressed the p21 expression. Here we report that the core protein
in the cytoplasm increases the amount of p21 via activating p53, and the core protein in the nucleus decreases the amount of p21 by
the p53-independent pathway. These observations suggest that the regulation of p21 expression by the core protein via subcellular
localization might decide the fate of infected cells either to the proliferation or to the apoptosis. 2 2 Elsevier Science (USA). All
rights reserved.
Keywords: Hepatitis C virus (HCV); Core protein; Processing; Subcellular localization; Heteromultimer
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