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• W2513922143 abstract "Hemagglutinin (HA), the membrane-bound fusion protein of the influenza virus, enables the entry of virus into host cells via a structural rearrangement. There is strong evidence that the primary trigger for this rearrangement is the low pH environment of a late endosome. To understand the structural basis and the dynamic consequences of the pH trigger, we employed explicit-solvent molecular dynamics simulations to investigate the initial stages of the HA transition. Our results indicate that lowered pH destabilizes HA and speeds up the dissociation of the fusion peptides (FPs). A buried salt bridge between the N-terminus and Asp1122 of HA stem domain locks the FPs and may act as one of the pH sensors. In line with recent observations from simplified protein models, we find that, after the dissociation of FPs, a structural order–disorder transition in a loop connecting the central coiled-coil to the C-terminal domains produces a highly mobile HA. This motion suggests the existence of a long-lived asymmetric or “symmetry-broken” intermediate during the HA conformational change. This intermediate conformation is consistent with models of hemifusion, and its early formation during the conformational change has implications for the aggregation seen in HA activity." @default.
• W2513922143 created "2016-09-16" @default.
• W2513922143 creator A5030987631 @default.
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• W2513922143 date "2016-09-01" @default.
• W2513922143 modified "2023-10-14" @default.
• W2513922143 title "Lowered pH Leads to Fusion Peptide Release and a Highly Dynamic Intermediate of Influenza Hemagglutinin" @default.
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• W2513922143 doi "https://doi.org/10.1021/acs.jpcb.6b06775" @default.
• W2513922143 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5130312" @default.
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• W2513922143 hasPublicationYear "2016" @default.
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