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The nucleocapsid protein of SARS-associated coronavirus inhibits B23 phosphorylation
Yingchun Zeng1, Linbai Ye, Shengli Zhu
1State Key Laboratory of Virology, College of Life Science, Wuhan University, Wuhan 430072, PR China.
Abstract:
Severe acute respiratory syndrome-associated coronavirus (SARS-CoV) is responsible for SARS infection. Nucleocapsid (N) protein of SARS-CoV encapsidates the viral RNA and plays an important role in virus particle assembly and release. In this study, the N protein of SARS-CoV was found to associate with B23, a phosphoprotein in nucleolus, in vitro and in vivo. Mapping studies localized the critical N sequences for this interaction to amino acid residues 175-210, which included a serine/arginine (SR)-rich domain. In vitro phosphorylation assay showed that the N protein inhibited the B23 phosphorylation at Thr199.
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