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    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="" 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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