EMD-12756
Rabbit 80S ribosome stalled close to the mutated SARS-CoV-2 slippery site by a pseudoknot (high resolution)
EMD-12756
Single-particle2.2 Å
Deposition: 14/04/2021
Map released: 02/06/2021
Last modified: 24/04/2024
Sample Organism:
Oryctolagus cuniculus,
Severe acute respiratory syndrome coronavirus 2,
Bos taurus
Sample: Rabbit 80S ribosome stalled close to the mutated SARS-CoV-2 slippery site by a pseudoknot
Fitted models: 7o7y (Avg. Q-score: 0.624)
Deposition Authors: Bhatt PR , Scaiola A
Sample: Rabbit 80S ribosome stalled close to the mutated SARS-CoV-2 slippery site by a pseudoknot
Fitted models: 7o7y (Avg. Q-score: 0.624)
Deposition Authors: Bhatt PR , Scaiola A
Structural basis of ribosomal frameshifting during translation of the SARS-CoV-2 RNA genome.
Bhatt PR ,
Scaiola A ,
Loughran G ,
Leibundgut M ,
Kratzel A ,
Meurs R ,
Dreos R ,
O'Connor KM ,
McMillan A ,
Bode JW ,
Thiel V ,
Gatfield D ,
Atkins JF ,
Ban N
(2021) Science , 372 , 1306 - 1313
(2021) Science , 372 , 1306 - 1313
Abstract:
Programmed ribosomal frameshifting is a key event during translation of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RNA genome that allows synthesis of the viral RNA-dependent RNA polymerase and downstream proteins. Here, we present the cryo-electron microscopy structure of a translating mammalian ribosome primed for frameshifting on the viral RNA. The viral RNA adopts a pseudoknot structure that lodges at the entry to the ribosomal messenger RNA (mRNA) channel to generate tension in the mRNA and promote frameshifting, whereas the nascent viral polyprotein forms distinct interactions with the ribosomal tunnel. Biochemical experiments validate the structural observations and reveal mechanistic and regulatory features that influence frameshifting efficiency. Finally, we compare compounds previously shown to reduce frameshifting with respect to their ability to inhibit SARS-CoV-2 replication, establishing coronavirus frameshifting as a target for antiviral intervention.
Programmed ribosomal frameshifting is a key event during translation of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RNA genome that allows synthesis of the viral RNA-dependent RNA polymerase and downstream proteins. Here, we present the cryo-electron microscopy structure of a translating mammalian ribosome primed for frameshifting on the viral RNA. The viral RNA adopts a pseudoknot structure that lodges at the entry to the ribosomal messenger RNA (mRNA) channel to generate tension in the mRNA and promote frameshifting, whereas the nascent viral polyprotein forms distinct interactions with the ribosomal tunnel. Biochemical experiments validate the structural observations and reveal mechanistic and regulatory features that influence frameshifting efficiency. Finally, we compare compounds previously shown to reduce frameshifting with respect to their ability to inhibit SARS-CoV-2 replication, establishing coronavirus frameshifting as a target for antiviral intervention.