Conformational changes in the hemagglutinin of influenza virus which accompany heat-induced fusion of virus with liposomes

Incubation of X-31 influenza virus at 62° results in changes in hemagglutinin structure which cause the virus to fuse with liposomes at neutral pH. Mutants of X-31 which contain different hemagglutinins and as a consequence fuse with liposomes at higher pH than wild-type virus also fuse at a lower t...

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Veröffentlicht in:Virology (New York, N.Y.) N.Y.), 1986-12, Vol.155 (2), p.484-497
Hauptverfasser: Ruigrok, R.W.H., Martin, S.R., Wharton, S.A., Skehel, J.J., Bayley, P.M., Wiley, D.C.
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container_issue 2
container_start_page 484
container_title Virology (New York, N.Y.)
container_volume 155
creator Ruigrok, R.W.H.
Martin, S.R.
Wharton, S.A.
Skehel, J.J.
Bayley, P.M.
Wiley, D.C.
description Incubation of X-31 influenza virus at 62° results in changes in hemagglutinin structure which cause the virus to fuse with liposomes at neutral pH. Mutants of X-31 which contain different hemagglutinins and as a consequence fuse with liposomes at higher pH than wild-type virus also fuse at a lower temperature. The heat-induced changes in hemagglutinin structure were monitored by CD, fluorescence spectroscopy, electron microscopy, and proteolytic digestion and compared with the characteristic changes which occur at low pH required for hemagglutinin-mediated membrane fusion at physiological temperature. The results indicate that the heat-induced changes in hemagglutinin which allow fusion activity result in partial denaturation of the molecule. By comparison the changes in structure required for fusion at low pH and normal temperature are specifically restricted.
doi_str_mv 10.1016/0042-6822(86)90210-2
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source MEDLINE; Elsevier ScienceDirect Journals Complete; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals
subjects Biological and medical sciences
Fundamental and applied biological sciences. Psychology
hemagglutinins
Hemagglutinins, Viral - physiology
Hydrogen-Ion Concentration
influenza virus
Liposomes
Membrane Fusion
Microbiology
Microscopy, Electron
Models, Molecular
Mutation
Orthomyxoviridae - physiology
Peptide Fragments
Protein Conformation
Protein Denaturation
Replicative cycle, interference, host-virus relations, pathogenicity, miscellaneous strains
Temperature
Trypsin - metabolism
Virology
title Conformational changes in the hemagglutinin of influenza virus which accompany heat-induced fusion of virus with liposomes
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