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. 1985 May 24;13(10):3667–3683. doi: 10.1093/nar/13.10.3667

Mechanism of codon recognition by transfer RNA studied with oligonucleotides larger than triplets.

D Labuda, G Striker, H Grosjean, D Porschke
PMCID: PMC341265  PMID: 4011439

Abstract

The binding of yeast tRNAPhe to UUCA, UUCC, UUCCC, UUCUUCU, U4, U5, U6 and U7 was analysed by fluorescence temperature jump and equilibrium sedimentation measurements. In all cases the two observed relaxation processes can be assigned to alpha) an intramolecular conformation change of the anticodon loop and beta) preferential binding of the oligonucleotides to one of the anticodon conformations. The anticodon loop transition is associated with inner sphere complexation of Mg2+ and proceeds with rate constants of about 10(3) s-1. The rate constants of oligonucleotide binding are between 4 and 10 X 10(6) M-1s-1 and reflect an increase of the association rate with the number of binding sites compensated to some degree by electrostatic repulsion in the preequilibrium complex. Neither temperature jump nor equilibrium sedimentation experiments provided evidence for UUCA or UUCC induced tRNA dimerisation, although UUC binding leads to strong tRNA dimerisation under equivalent conditions. The results obtained for the longer oligonucleotides are similar. In the case of UUCUUCU with its two potential binding sites for tRNAPhe there was no evidence for the formation of 'ternary' complexes. Apparently tRNAPhe binds preferentially to the second UUC of this 'messenger' and forms additional contacts with residues on either side of the codon. Some evidence for the formation of ternary complexes is obtained for U6 and U7, although the extent of this reaction remains very small. Our results demonstrate that the mode of tRNA binding to a codon is strongly influenced by residues next to the codon. The formation of cooperative contacts between tRNA molecules at adjacent codons apparently requires support by a catalyst adjusting an appropriate conformation of messenger and tRNA molecules.

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Selected References

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