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TitleVariation in structural motifs within SARS-related coronavirus spike proteins.
Journal, issue, pagesPLoS Pathog, Vol. 20, Issue 5, Page e1012158, Year 2024
Publish dateMay 28, 2024
AuthorsFrancesca R Hills / Alice-Roza Eruera / James Hodgkinson-Bean / Fátima Jorge / Richard Easingwood / Simon H J Brown / James C Bouwer / Yi-Ping Li / Laura N Burga / Mihnea Bostina /
PubMed AbstractSARS-CoV-2 is the third known coronavirus (CoV) that has crossed the animal-human barrier in the last two decades. However, little structural information exists related to the close genetic species ...SARS-CoV-2 is the third known coronavirus (CoV) that has crossed the animal-human barrier in the last two decades. However, little structural information exists related to the close genetic species within the SARS-related coronaviruses. Here, we present three novel SARS-related CoV spike protein structures solved by single particle cryo-electron microscopy analysis derived from bat (bat SL-CoV WIV1) and civet (cCoV-SZ3, cCoV-007) hosts. We report complex glycan trees that decorate the glycoproteins and density for water molecules which facilitated modeling of the water molecule coordination networks within structurally important regions. We note structural conservation of the fatty acid binding pocket and presence of a linoleic acid molecule which are associated with stabilization of the receptor binding domains in the "down" conformation. Additionally, the N-terminal biliverdin binding pocket is occupied by a density in all the structures. Finally, we analyzed structural differences in a loop of the receptor binding motif between coronaviruses known to infect humans and the animal coronaviruses described in this study, which regulate binding to the human angiotensin converting enzyme 2 receptor. This study offers a structural framework to evaluate the close relatives of SARS-CoV-2, the ability to inform pandemic prevention, and aid in the development of pan-neutralizing treatments.
External linksPLoS Pathog / PubMed:38805567
MethodsEM (single particle)
Resolution1.88 - 2.11 Å
Structure data

EMDB-41149, PDB-8tc0:
Cryo-EM Structure of Spike Glycoprotein from Bat Coronavirus WIV1 in Closed Conformation
Method: EM (single particle) / Resolution: 1.88 Å

EMDB-41150, PDB-8tc1:
Cryo-EM Structure of Spike Glycoprotein from Civet Coronavirus 007 in Closed Conformation
Method: EM (single particle) / Resolution: 1.92 Å

EMDB-41152, PDB-8tc5:
Cryo-EM Structure of Spike Glycoprotein from Civet Coronavirus SZ3 in Closed Conformation
Method: EM (single particle) / Resolution: 2.11 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose / N-Acetylglucosamine

ChemComp-EIC:
LINOLEIC ACID / Linoleic acid

ChemComp-HOH:
WATER / Water

Source
  • rhinolophus sinicus (Chinese rufous horseshoe bat)
  • paguma larvata (masked palm civet)
  • civet sars cov sz3/2003 (virus)
KeywordsVIRAL PROTEIN / Spike / Glycoprotein / Coronavirus

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