globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1805442115
论文题名:
Atomistic simulations indicate the functional loop-to-coiled-coil transition in influenza hemagglutinin is not downhill
作者: Lin X.; Noel J.K.; Wang Q.; Ma J.; Onuchic J.N.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:34
起始页码: E7905
结束页码: E7913
语种: 英语
英文关键词: All-atom molecular dynamics ; B-loop transition ; Buried water ; Sequence divergence ; Structural heterogeneity
Scopus关键词: Influenza virus hemagglutinin ; threonine ; Influenza virus hemagglutinin ; alpha helix ; amino terminal sequence ; Article ; B loop ; beta sheet ; carboxy terminal sequence ; conformational transition ; controlled study ; crystal structure ; hydrogen bond ; hydrophobicity ; loop to coiled coil transition ; molecular dynamics ; molecular interaction ; molecular stability ; pH ; priority journal ; protein folding ; protein modification ; protein refolding ; protein structure ; residue analysis ; sequence analysis ; structure activity relation ; structure analysis ; thermodynamics ; chemistry ; Influenza A virus ; metabolism ; protein quaternary structure ; protein secondary structure ; Hemagglutinin Glycoproteins, Influenza Virus ; Influenza A virus ; Molecular Dynamics Simulation ; Protein Structure, Quaternary ; Protein Structure, Secondary
英文摘要: Influenza hemagglutinin (HA) mediates viral entry into host cells through a large-scale conformational rearrangement at low pH that leads to fusion of the viral and endosomal membranes. Crystallographic and biochemical data suggest that a loop-to-coiled-coil transition of the B-loop region of HA is important for driving this structural rearrangement. However, the microscopic picture for this proposed “spring-loaded” movement is missing. In this study, we focus on understanding the transition of the B loop and perform a set of all-atom molecular dynamics simulations of the full B-loop trimeric structure with the CHARMM36 force field. The free-energy profile constructed from our simulations describes a B loop that stably folds half of the postfusion coiled coil in tens of microseconds, but the full coiled coil is unfavorable. A buried hydrophilic residue, Thr59, is implicated in destabilizing the coiled coil. Interestingly, this conserved threonine is the only residue in the B loop that strictly differentiates between the group 1 and 2 HA molecules. Microsecond-scale constant temperature simulations revealed that kinetic traps in the structural switch of the B loop can be caused by nonnative, intra-monomer, or intermonomer β-sheets. The addition of the A helix stabilized the postfusion state of the B loop, but introduced the possibility for further β-sheet structures. Overall, our results do not support a description of the B loop in group 2 HAs as a stiff spring, but, rather, it allows for more structural heterogeneity in the placement of the fusion peptides during the fusion process. © 2018 National Academy of Sciences. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163673
Appears in Collections:气候变化与战略

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作者单位: Lin, X., Center for Theoretical Biological Physics, Rice University, Houston, TX 77030, United States, Department of Physics and Astronomy, Rice University, Houston, TX 77005, United States; Noel, J.K., Crystallography, Max Delbrück Center for Molecular Medicine, Berlin, 13125, Germany; Wang, Q., Verna and Marrs McLean Department of Biochemistry, Molecular Biology, Baylor College of Medicine, Houston, TX 77030, United States; Ma, J., Center for Theoretical Biological Physics, Rice University, Houston, TX 77030, United States, Verna and Marrs McLean Department of Biochemistry, Molecular Biology, Baylor College of Medicine, Houston, TX 77030, United States, Department of Bioengineering, Rice University, Houston, TX 77030, United States; Onuchic, J.N., Center for Theoretical Biological Physics, Rice University, Houston, TX 77030, United States, Department of Physics and Astronomy, Rice University, Houston, TX 77005, United States, Department ofChemistry, Rice University, Houston, TX 77005, United States, Department of BioSciences, Rice University, Houston, TX 77005, United States

Recommended Citation:
Lin X.,Noel J.K.,Wang Q.,et al. Atomistic simulations indicate the functional loop-to-coiled-coil transition in influenza hemagglutinin is not downhill[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(34)
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