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Semin Cell Dev Biol. 2016 Jul 8. pii: S1084-9521(16)30202-6. doi: 10.1016/j.semcdb.2016.07.007. [Epub ahead of print]
Mechanisms of influenza viral membrane fusion.
Blijleven JS1, Boonstra S1, Onck PR1, van der Giessen E1, van Oijen AM2.
Author information
Abstract
Influenza viral particles are enveloped by a lipid bilayer. A major step in infection is fusion of the viral and host cellular membranes, a process with large kinetic barriers. Influenza membrane fusion is catalyzed by hemagglutinin (HA), a class I viral fusion protein activated by low pH. The exact nature of the HA conformational changes that deliver the energy required for fusion remains poorly understood. This review summarizes our current knowledge of HA structure and dynamics, describes recent single-particle experiments and modeling studies, and discusses their role in understanding how multiple HAs mediate fusion. These approaches provide a mechanistic picture in which HAs independently and stochastically insert into the target membrane, forming a cluster of HAs that is collectively able to overcome the barrier to membrane fusion. The new experimental and modeling approaches described in this review hold promise for a more complete understanding of other viral fusion systems and the protein systems responsible for cellular fusion.
Copyright ? 2016. Published by Elsevier Ltd.
KEYWORDS:
hemagglutinin; influenza; membrane fusion; modelling; single-particle; structure
PMID: 27401120 DOI: 10.1016/j.semcdb.2016.07.007
[PubMed - as supplied by publisher]
Mechanisms of influenza viral membrane fusion.
Blijleven JS1, Boonstra S1, Onck PR1, van der Giessen E1, van Oijen AM2.
Author information
Abstract
Influenza viral particles are enveloped by a lipid bilayer. A major step in infection is fusion of the viral and host cellular membranes, a process with large kinetic barriers. Influenza membrane fusion is catalyzed by hemagglutinin (HA), a class I viral fusion protein activated by low pH. The exact nature of the HA conformational changes that deliver the energy required for fusion remains poorly understood. This review summarizes our current knowledge of HA structure and dynamics, describes recent single-particle experiments and modeling studies, and discusses their role in understanding how multiple HAs mediate fusion. These approaches provide a mechanistic picture in which HAs independently and stochastically insert into the target membrane, forming a cluster of HAs that is collectively able to overcome the barrier to membrane fusion. The new experimental and modeling approaches described in this review hold promise for a more complete understanding of other viral fusion systems and the protein systems responsible for cellular fusion.
Copyright ? 2016. Published by Elsevier Ltd.
KEYWORDS:
hemagglutinin; influenza; membrane fusion; modelling; single-particle; structure
PMID: 27401120 DOI: 10.1016/j.semcdb.2016.07.007
[PubMed - as supplied by publisher]