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- W2077023914 abstract "The 970 loop (helix 31) of Escherichia coli 16S ribosomal RNA contains two modified nucleotides, m(2)G966 and m(5)C967. Positions A964, A969, and C970 are conserved among the Bacteria, Archaea, and Eukarya. The nucleotides present at positions 965, 966, 967, 968, and 971, however, are only conserved and unique within each domain. All organisms contain a modified nucleoside at position 966, but the type of the modification is domain specific. Biochemical and structure studies have placed this loop near the P site and have shown it to be involved in the decoding process and in binding the antibiotic tetracycline. To identify the functional components of this ribosomal RNA hairpin, the eight nucleotides of the 970 loop of helix 31 were subjected to saturation mutagenesis and 107 unique functional mutants were isolated and analyzed. Nonrandom nucleotide distributions were observed at each mutated position among the functional isolates. Nucleotide identity at positions 966 and 969 significantly affects ribosome function. Ribosomes with single mutations of m(2)G966 or m(5)C967 produce more protein in vivo than do wild-type ribosomes. Overexpression of initiation factor 3 specifically restored wild-type levels of protein synthesis to the 966 and 967 mutants, suggesting that modification of these residues is important for initiation factor 3 binding and for the proper initiation of protein synthesis." @default.
- W2077023914 created "2016-06-24" @default.
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- W2077023914 date "2008-02-01" @default.
- W2077023914 modified "2023-09-23" @default.
- W2077023914 title "Identification and role of functionally important motifs in the 970 loop of Escherichia coli 16S ribosomal RNA" @default.
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- W2077023914 doi "https://doi.org/10.1016/j.jmb.2007.11.102" @default.
- W2077023914 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2262921" @default.
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