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A pocket-factor-triggered conformational switch in the hepatitis B virus capsid
Lauriane Lecoq 1 , Shishan Wang 1 , Marie Dujardin 1 , Peter Zimmermann 2 , Leonard Schuster 2 , Marie-Laure Fogeron 1 , Mathilde Briday 1 , Maarten Schledorn 3 , Thomas Wiegand 3 , Laura Cole 1 , Roland Montserret 1 , Stéphane Bressanelli 4 , Beat H Meier 3 , Michael Nassal 5 , Anja Böckmann 6
Affiliations
Affiliations
1
Molecular Microbiology and Structural Biochemistry, Labex Ecofect, UMR 5086 CNRS/Université de Lyon, Lyon 69367, France.
2
Department of Medicine II/Molecular Biology, University Hospital Freiburg, Medical Center, University of Freiburg, Freiburg 79106, Germany.
3
Physical Chemistry, ETH Zurich, Zurich 8093, Switzerland.
4
Institute for Integrative Biology of the Cell, Commissariat à l'énergie atomique, CNRS, Université Paris-Saclay, Gif sur Yvette Cedex 91198, France.
5
Department of Medicine II/Molecular Biology, University Hospital Freiburg, Medical Center, University of Freiburg, Freiburg 79106, Germany; [email protected] [email protected].
6
Molecular Microbiology and Structural Biochemistry, Labex Ecofect, UMR 5086 CNRS/Université de Lyon, Lyon 69367, France; [email protected] [email protected].
PMID: 33879615 DOI: 10.1073/pnas.2022464118
Abstract
Viral hepatitis is growing into an epidemic illness, and it is urgent to neutralize the main culprit, hepatitis B virus (HBV), a small-enveloped retrotranscribing DNA virus. An intriguing observation in HB virion morphogenesis is that capsids with immature genomes are rarely enveloped and secreted. This prompted, in 1982, the postulate that a regulated conformation switch in the capsid triggers envelopment. Using solid-state NMR, we identified a stable alternative conformation of the capsid. The structural variations focus on the hydrophobic pocket of the core protein, a hot spot in capsid-envelope interactions. This structural switch is triggered by specific, high-affinity binding of a pocket factor. The conformational change induced by the binding is reminiscent of a maturation signal. This leads us to formulate the "synergistic double interaction" hypothesis, which explains the regulation of capsid envelopment and indicates a concept for therapeutic interference with HBV envelopment.
Keywords: Triton; hepatitis B virus; hydrophobic pocket; solid-state NMR.
Copyright © 2021 the Author(s). Published by PNAS. |
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