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-Structure paper
タイトル | Structural intermediates in the low pH-induced transition of influenza hemagglutinin. |
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ジャーナル・号・ページ | PLoS Pathog, Vol. 16, Issue 11, Page e1009062, Year 2020 |
掲載日 | 2020年11月30日 |
著者 | Jingjing Gao / Miao Gui / Ye Xiang / |
PubMed 要旨 | The hemagglutinin (HA) glycoproteins of influenza viruses play a key role in binding host cell receptors and in mediating virus-host cell membrane fusion during virus infection. Upon virus entry, HA ...The hemagglutinin (HA) glycoproteins of influenza viruses play a key role in binding host cell receptors and in mediating virus-host cell membrane fusion during virus infection. Upon virus entry, HA is triggered by low pH and undergoes large structural rearrangements from a prefusion state to a postfusion state. While structures of prefusion state and postfusion state of HA have been reported, the intermediate structures remain elusive. Here, we report two distinct low pH intermediate conformations of the influenza virus HA using cryo-electron microscopy (cryo-EM). Our results show that a decrease in pH from 7.8 to 5.2 triggers the release of fusion peptides from the binding pockets and then causes a dramatic conformational change in the central helices, in which the membrane-proximal ends of the central helices unwind to an extended form. Accompanying the conformational changes of the central helices, the stem region of the HA undergoes an anticlockwise rotation of 9.5 degrees and a shift of 15 Å. The HA head, after being stabilized by an antibody, remains unchanged compared to the neutral pH state. Thus, the conformational change of the HA stem region observed in our research is likely to be independent of the HA head. These results provide new insights into the structural transition of HA during virus entry. |
リンク | PLoS Pathog / PubMed:33253316 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.8 - 4.2 Å |
構造データ | EMDB-22652, PDB-7k37: EMDB-22653, PDB-7k39: EMDB-22654, PDB-7k3a: EMDB-22655, PDB-7k3b: |
化合物 | ChemComp-NAG: |
由来 |
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キーワード | VIRAL PROTEIN / influenza / virus / hemagglutinin / antibody / low pH |