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. 1991 Apr 25;19(8):1909–1915. doi: 10.1093/nar/19.8.1909

Direct tRNA-protein interactions in ribosomal complexes.

G G Abdurashidova 1, E A Tsvetkova 1, E I Budowsky 1
PMCID: PMC328123  PMID: 1709494

Abstract

Nucleotide residues in E. coli tRNA(Phe) interacting directly with proteins in pre- and posttranslocated ribosomal complexes have been identified by UV-induced cross-linking. In the tRNA(Phe) molecule located in the Ab-site (pretranslocated complex) residues A9, G18, A26 and U59 are cross-linked with proteins S10, L27, S7 and L2, respectively. In tRNA(Phe) located in the Pt-site (posttranslocated complex) residues C17, G44, C56 and U60 are cross-linked with proteins L2, L5, L27 and S9, respectively. The same cross-links (except for G44-L5) have been found for tRNA in the Pb-site of the pretranslocated ribosomal complex. None of the tRNA(Phe) residues cross-linked with proteins in the complexes examined by us are involved in the stabilization of the secondary structure, but residues A9, G18, A26, G44 and C56 participate in stabilization of tRNA tertiary structure. Since translocation of tRNA(Phe) from Ab- to P-site is accompanied by changes of tRNA contacts with proteins L2 and L27, we postulate that this translocation is coupled with tRNA turn around the axis joining the anticodon loop with the CCA-end of the molecule. This is in agreement with the idea about the presence of a kink in mRNA between codons located in the ribosomal A- and P-sites. In all E. coli tRNAs with known primary structure positions 18 and 56, interacting with L27 protein, when tRNA is located either in A- or P-site, are invariant, whereas positions 17 and 60, interacting with proteins only when tRNA is in the P-site, are strongly conserved. In positions 9, 26 and 59 purines are the preferred residues. In most E. coli tRNAs deviations from the consensus in these three positions is strongly correlated.

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Selected References

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