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- W3022289501 abstract "ABSTRACT GCN codons are over-represented in initial codons of ORFs of prokaryote and eukaryote mRNAs. We describe a ribosome rRNA-protein surface that interacts with an mRNA GCN codon when next-in-line for the ribosome A site. The interaction surface is comprised of the edges of two stacked rRNA bases: the Watson-Crick edge of 16S/18S rRNA C1054 and adjacent Hoogsteen edge of A1196 ( Escherichia coli 16S rRNA numbering). Also part of the interaction surface, the planar guanidinium group of a conserved Arginine (R146 of yeast ribosomal protein Rps3) is stacked adjacent to A1196. On its other side, the interaction surface is anchored to the ribosome A site through base stacking of C1054 with the wobble anticodon base of the A-site tRNA. Using Molecular Dynamics simulations of a 495-residue subsystem of translocating ribosomes, we observe base pairing of C1054 to nucleotide G at position 1 of the next-in-line codon, consistent with previous cryo-EM observations, and hydrogen bonding of A1196 and R146 to C at position 2. Hydrogen bonding to both of these codon positions is significantly weakened when C at position 2 is changed to G, A or U. These sequence-sensitive mRNA-ribosome interactions at the C 1054- A 1196- R 146 (CAR) surface potentially contribute to GCN-mediated regulation of protein translation." @default.
- W3022289501 created "2020-05-13" @default.
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- W3022289501 date "2020-04-29" @default.
- W3022289501 modified "2023-09-26" @default.
- W3022289501 title "A Ribosome Interaction Surface Sensitive to mRNA GCN Periodicity" @default.
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- W3022289501 doi "https://doi.org/10.1101/2020.04.28.058271" @default.
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