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• W4285677445 abstract "ABSTRACT Ribosomes serve as the universally conserved translators of the genetic code into proteins and must support life across temperatures ranging from below freezing to above the boiling point of water. Ribosomes are capable of functioning across this wide range of temperatures even though the catalytic site for peptide bond formation, the peptidyl transferase center, is nearly universally conserved. Peptide bond formation by the ribosome requires correct positioning of the 3’ s-end of the aminoacylated tRNA (aa-tRNA) substrate, which is aided by an RNA hairpin in the ribosomal RNA (rRNA) of the large subunit, termed the A loop. Here we find that Thermoproteota, a phylum of thermophilic Archaea, substitute cytidine for uridine at large subunit rRNA positions 2554 and 2555 ( Escherichia coli numbering) in the A loop, immediately adjacent to the binding site for the 3′-end of A-site tRNA. We show by cryo-EM that E. coli ribosomes with uridine to cytidine mutations at these positions retain the proper fold and post-transcriptional modification of the A loop. Additionally, these mutations do not exert a dominant negative effect on cellular growth, protect the large ribosomal subunit from thermal denaturation, and increase the mutational robustness of nucleotides in the peptidyl transferase center. This work identifies sequence variation in the peptidyl transferase center of the archaeal ribosome that likely confers stabilization of the ribosome at high temperatures and develops a stable mutant bacterial ribosome that can act as a scaffold for future ribosome engineering efforts." @default.
• W4285677445 created "2022-07-17" @default.
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• W4285677445 date "2022-07-16" @default.
• W4285677445 modified "2023-09-27" @default.
• W4285677445 title "Rare Ribosomal RNA Sequences from Archaea Stabilize the Bacterial Ribosome" @default.
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• W4285677445 doi "https://doi.org/10.1101/2022.07.15.499945" @default.
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