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| 1 | Special features of the 2009 pandemic swine-origin influenza AH1N1 hemagglutinin and neuraminidase显示文摘Since the 2009 pandemic H1N1 swine-origin influenza A virus (09 S-OIV) has reminded the world about the global threat of the ever changing influenza virus,many questions regarding the detailed re-assortment of influenza viruses yet remain unanswered.Influenza A virus is the causative agent of the pandemic flu and contains 2 major antigenic glycoproteins on its surface:(i) hemagglutinin (HA);and (ii) neuraminidase (NA).The structures of the 09 S-OIV HA and NA proteins (09H1 and 09N1) have recently been resolved in our laboratory and provide some clues as to why the 09 S-OIV re-assortment virus is highly infectious with severe consequences in humans.For example,the 09H1 is highly similar to the HA of the 1918 influenza A pandemic virus in overall structure and especially in regards to its 5 defined antibody binding epitopes.For 09N1,its most distinctive feature is the lack of a 150-loop active site cavity,which was previously predicted to be present in all N1 NAs,and we hypothesize that the 150-loop may play a important role in the substrate specificity (α2,3 or α2,6 linked sialic acid receptors) and enzymatic mechanism of influenza NA.Combination of the HA and NA with special characteristics for the 09 S-OIV might contribute to its high increased transmissibility in humans. | VAVRICKA Christopher John LIU Yue LI Qing SHI Yi WU Yan SUN YePing QI JianXun GAO George Fu | 2011 | Chinese Science Bulletin2011，56，17： | 2 |
| 2 | Two interesting biological fields:Avian influenza virus and epigenetics显示文摘The highly pathogenic avian influenza virus H5N1 attracted much attention in 2009,when the human death toll due to infection with this virus in China created a potential world-wide pandemic alert. | HUA QingXin | 2010 | Chinese Science Bulletin2010，55，35： | 0 |
| 3 | 应用巢式RT-PCR扩增HA和NA基因片段并测序鉴定甲型H1N1流感病毒显示文摘目的 建立一种利用巢式RT-PCR特异扩增HA和NA基因片段并测序鉴定甲型H1N1流感病毒的技术.方法 设计两套共7条特异引物,通过巢式RT-PCR分别扩增甲型H1N1流感病毒HA和NA基因片段并测序,所得序列与人感染甲型流感病毒主要HA和NA亚型序列进行进化树分析以对结果作进一步鉴定,蛋白序列比对后分析其特征.结果 4例甲型H1N1流感患者流感病毒HA和NA基因RT-PCR扩增均分别得到442 bp和543 bp片段产物.核苷酸序列进化分析表明,该4例患者HA和NA序列分别与2009年爆发的甲型H1N1流感病毒HA及NA序列聚集在一起,与季节性H1、H2、H3、人禽流感H5亚型及季节性N1、N2、人禽流感N1亚型特异分开.蛋白序列分析表明,4例患者流感病毒HA蛋白裂解位点附近氨基酸序列均为PSIQSR↓GLF,不具有高致病性流感病毒的特性,NA蛋白第275位氨基酸为His,未出现H275Y的耐药变异.结论 本方法能特异扩增甲型H1N1流感病毒HA和NA基因片段,测序后可用于甲型H1N1流感病毒的进一步鉴定 同时,得到的序列也可用于流感病毒致病力及耐药性的分析. | 陈伟烈 魏绍静 张复春 王建 唐漾波 | 2010 | 中华生物医学工程杂志2010，16，5： | 0 |
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