Substitution of lysine at 627 position in PB2 protein does not change virulence of the 2009 pandemic H1N1 virus in mice

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• 作者：Huachen Zhu ; Jia Wang ; Pui Wang ; Wenjun Song ; Zuoyi Zheng ; Rirong Chen ; Kunyuan Guo ; Taixing Zhang ; Joseph S.M. Peiris ; Honglin Chen ; Yi Guan
• 关键词：Influenza virus ; Pathogenicity ; Virulence ; PB2 627 residue ; Temperature-sensitivity
• 刊名：Virology
• 出版年：2010
• 出版时间：25 May 2010
• 年：2010
• 卷：401
• 期：1
• 页码：1-5
• 全文大小：724 K

文摘

A lysine at the 627 position (627K) of PB2 protein of influenza virus has been recognized as a determinant for host adaptation and a virulent element for some influenza viruses. While seasonal influenza viruses exclusively contained 627K, the pandemic (H1N1) 2009 possessed a glutamic acid (627E), even after circulation in humans for more than 6 months. To explore the potential role of E627K substitution in PB2 in the pandemic (H1N1) 2009 virus, we compared pathogenicity and growth properties between a recombinant virus containing 627K PB2 gene and the parental A/California/4/2009 strain containing 627E. Our results showed that substitution of 627K in PB2 gene does not confer higher virulence and growth rate for the pandemic (H1N1) 2009 virus in mice and cell culture respectively, suggesting 627K is not required for human adaptation of the pandemic (H1N1) 2009 virus.