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  • 1
    Publication Date: 2013-09-07
    Description: An avian-origin human-infecting influenza (H7N9) virus was recently identified in China. We have evaluated the viral hemagglutinin (HA) receptor-binding properties of two human H7N9 isolates, A/Shanghai/1/2013 (SH-H7N9) (containing the avian-signature residue Gln(226)) and A/Anhui/1/2013 (AH-H7N9) (containing the mammalian-signature residue Leu(226)). We found that SH-H7N9 HA preferentially binds the avian receptor analog, whereas AH-H7N9 HA binds both avian and human receptor analogs. Furthermore, an AH-H7N9 mutant HA (Leu(226) --〉 Gln) was found to exhibit dual receptor-binding property, indicating that other amino acid substitutions contribute to the receptor-binding switch. The structures of SH-H7N9 HA, AH-H7N9 HA, and its mutant in complex with either avian or human receptor analogs show how AH-H7N9 can bind human receptors while still retaining the avian receptor-binding property.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shi, Yi -- Zhang, Wei -- Wang, Fei -- Qi, Jianxun -- Wu, Ying -- Song, Hao -- Gao, Feng -- Bi, Yuhai -- Zhang, Yanfang -- Fan, Zheng -- Qin, Chengfeng -- Sun, Honglei -- Liu, Jinhua -- Haywood, Joel -- Liu, Wenjun -- Gong, Weimin -- Wang, Dayan -- Shu, Yuelong -- Wang, Yu -- Yan, Jinghua -- Gao, George F -- New York, N.Y. -- Science. 2013 Oct 11;342(6155):243-7. doi: 10.1126/science.1242917. Epub 2013 Sep 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Research Network of Immunity and Health, Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24009358" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Birds ; Crystallography, X-Ray ; Glycine/chemistry/genetics/metabolism ; Hemagglutinin Glycoproteins, Influenza Virus/*chemistry/metabolism ; Humans ; Influenza A virus/*metabolism ; Influenza in Birds/*virology ; Influenza, Human/*virology ; Protein Conformation ; Receptors, Cell Surface/*chemistry/genetics/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2014-04-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gao, George F -- New York, N.Y. -- Science. 2014 Apr 18;344(6181):235. doi: 10.1126/science.1254664.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉George F. Gao is director of the CAS Key Laboratory of Pathogenic Microbiology and Immunology at the Institute for Microbiology of the Chinese Academy of Sciences, Beijing; vice president of the Beijing Institutes of Life Science, Beijing; president of the Chinese Society for Virology, Beijing; and deputy director general of the Chinese Center for Disease Control and Prevention, Beijing.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24744345" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; China/epidemiology ; *Commerce ; Humans ; *Influenza A Virus, H7N9 Subtype/genetics/isolation & purification ; *Influenza A virus/genetics/isolation & purification ; Influenza in Birds/*epidemiology/transmission ; Influenza, Human/epidemiology/*prevention & control/*transmission/virology ; *Poultry/virology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2013-07-05
    Description: Human infection associated with a novel reassortant avian influenza H7N9 virus has recently been identified in China. A total of 132 confirmed cases and 39 deaths have been reported. Most patients presented with severe pneumonia and acute respiratory distress syndrome. Although the first epidemic has subsided, the presence of a natural reservoir and the disease severity highlight the need to evaluate its risk on human public health and to understand the possible pathogenesis mechanism. Here we show that the emerging H7N9 avian influenza virus poses a potentially high risk to humans. We discover that the H7N9 virus can bind to both avian-type (alpha2,3-linked sialic acid) and human-type (alpha2,6-linked sialic acid) receptors. It can invade epithelial cells in the human lower respiratory tract and type II pneumonocytes in alveoli, and replicated efficiently in ex vivo lung and trachea explant culture and several mammalian cell lines. In acute serum samples of H7N9-infected patients, increased levels of the chemokines and cytokines IP-10, MIG, MIP-1beta, MCP-1, IL-6, IL-8 and IFN-alpha were detected. We note that the human population is naive to the H7N9 virus, and current seasonal vaccination could not provide protection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhou, Jianfang -- Wang, Dayan -- Gao, Rongbao -- Zhao, Baihui -- Song, Jingdong -- Qi, Xian -- Zhang, Yanjun -- Shi, Yonglin -- Yang, Lei -- Zhu, Wenfei -- Bai, Tian -- Qin, Kun -- Lan, Yu -- Zou, Shumei -- Guo, Junfeng -- Dong, Jie -- Dong, Libo -- Zhang, Ye -- Wei, Hejiang -- Li, Xiaodan -- Lu, Jian -- Liu, Liqi -- Zhao, Xiang -- Li, Xiyan -- Huang, Weijuan -- Wen, Leying -- Bo, Hong -- Xin, Li -- Chen, Yongkun -- Xu, Cuilin -- Pei, Yuquan -- Yang, Yue -- Zhang, Xiaodong -- Wang, Shiwen -- Feng, Zijian -- Han, Jun -- Yang, Weizhong -- Gao, George F -- Wu, Guizhen -- Li, Dexin -- Wang, Yu -- Shu, Yuelong -- England -- Nature. 2013 Jul 25;499(7459):500-3. doi: 10.1038/nature12379. Epub 2013 Jul 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Institute for Viral Disease Control and Prevention, China CDC, Key Laboratory for Medical Virology, National Health and Family Planning Commission, Beijing 102206, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23823727" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Viral/immunology ; Birds/virology ; Bronchi/cytology/metabolism/virology ; Cell Line ; Chemokines/blood ; China ; Cross Reactions/immunology ; Epithelial Cells/virology ; Host Specificity ; Humans ; In Vitro Techniques ; Influenza A Virus, H5N1 Subtype/immunology/physiology ; Influenza A virus/immunology/pathogenicity/*physiology ; Influenza Vaccines/immunology ; Influenza in Birds/transmission/*virology ; Influenza, Human/blood/immunology/virology ; Lung/virology ; N-Acetylneuraminic Acid/analogs & derivatives/chemistry/metabolism ; Organ Specificity ; Pulmonary Alveoli/cytology/metabolism/virology ; Receptors, Virus/chemistry/*metabolism ; Trachea/virology ; Virus Replication ; Zoonoses/transmission/virology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2013-05-04
    Description: Recent studies have identified several mutations in the hemagglutinin (HA) protein that allow the highly pathogenic avian H5N1 influenza A virus to transmit between mammals by airborne route. Here, we determined the complex structures of wild-type and mutant HAs derived from an Indonesia H5N1 virus bound to either avian or human receptor sialic acid analogs. A cis/trans conformational change in the glycosidic linkage of the receptor analog was observed, which explains how the H5N1 virus alters its receptor-binding preference. Furthermore, the mutant HA possessed low affinities for both avian and human receptors. Our findings provide a structural and biophysical basis for the H5N1 adaptation to acquire human, but maintain avian, receptor-binding properties.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Wei -- Shi, Yi -- Lu, Xishan -- Shu, Yuelong -- Qi, Jianxun -- Gao, George F -- New York, N.Y. -- Science. 2013 Jun 21;340(6139):1463-7. doi: 10.1126/science.1236787. Epub 2013 May 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23641058" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Binding Sites ; Birds ; Carbohydrate Conformation ; Crystallography, X-Ray ; Hemagglutinin Glycoproteins, Influenza Virus/*chemistry/genetics/*metabolism ; Humans ; Influenza A Virus, H5N1 Subtype ; Models, Molecular ; Mutant Proteins/chemistry/metabolism ; Mutation ; Oligosaccharides/chemistry/metabolism ; Protein Binding ; Protein Conformation ; Protein Stability ; Receptors, Cell Surface/chemistry/*metabolism ; Receptors, Virus/chemistry/*metabolism ; Recombinant Proteins/chemistry/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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