高福院士研究组EMBO解析禽流感病毒跨物种传播机制

2015-05-07 佚名 中科院

2013年6月,在台湾发现了全球首例人类感染H6N1亚型禽流感病例。从患者体内所分离的病毒基因序列显示,此病毒为一典型的低致病性禽流感病毒,与台湾本土家禽中的H6N1病毒株非常接近,其跨物种传播的分子机制成为世界科学家所关注的焦点,中国科学院微生物研究所研究员、中科院院士高福课题组在此方面的研究取得新进展,相关研究成果已于5月4日在线发表在国际杂志The EMBO Journal上。1972年以来

2013年6月,在台湾发现了全球首例人类感染H6N1亚型禽流感病例。从患者体内所分离的病毒基因序列显示,此病毒为一典型的低致病性禽流感病毒,与台湾本土家禽中的H6N1病毒株非常接近,其跨物种传播的分子机制成为世界科学家所关注的焦点,中国科学院微生物研究所研究员、中科院院士高福课题组在此方面的研究取得新进展,相关研究成果已于5月4日在线发表在国际杂志The EMBO Journal上。

1972年以来,H6N1亚型禽流感病毒感染已在台湾家禽中流行,病毒在台湾家禽之间的流行具有独特的基因谱系,不同于香港和中国大陆东南部的流行。研究人员通过分析台湾地区所有H6N1亚型流感病毒的HA蛋白中决定受体结合特性的关键性氨基酸位点变化,选取代表性毒株从蛋白和病毒水平上对其受体结合特性进行了研究,从而提出台湾地区的H6N1亚型流感病毒按其受体结合特性变化,可分为两个不同的主要时期,即早期为偏好禽源受体结合期和后期为双受体结合期,而这次人感染H6N1则偏好结合人源受体。

通过对突变体受体结合特性的研究,鉴定了其受体结合特性发生转变的关键性氨基酸位点,即186、190、228位氨基酸在H6N1亚型流感病毒的受体结合特性转变中发挥了重要的作用,E190V、G228S的突变可使H6N1亚型流感病毒获得人源受体结合能力,而P186L突变可使其偏好性结合人源受体。同时研究人员还通过结构生物学的方法从原子水平上阐明了P186L突变使得H6N1亚型流感病毒发生受体偏好性改变的结构基础。
  
研究人员认为目前大部分H6N1亚型的流感病毒仍保持着高水平地结合禽源受体的能力,这可能限制了其在人体内有效的复制和传播,但其对人类的生命安全还是会造成一定威胁,正如新型H7N9流感病毒一样,尤其是当H6N1亚型病毒与H9N2亚型流感病毒发生基因重组后,可能会引起新的流感大暴发。更为重要的是,这次人感染H6N1禽流感病毒偏好性结合人源受体,这表明它在受体结合特性上已与人流感病毒类似,如果加上其它的基因变异,极有可能引发大流行。

原始出处:

Wang F, Qi J, Bi Y, Zhang W, Wang M,et al.Adaptation of avian influenza A (H6N1) virus from avian to human receptor-binding preference.EMBO J. 2015 May 4. pii: e201590960.

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    2016-04-22 hongbochen
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    2015-07-14 respect
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    2016-01-16 medsic

    嗯,

    0

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    2016-01-16 medsic

    嗯,

    0

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    2016-01-16 medsic

    过来学习下,

    0

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    2016-01-16 medsic

    过来学习下,

    0

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