Abstract
Equilibrium dialysis experiments indicate complex formation between the trinucleotide ApUpGp and tRNAfMet, the dissociation constant of the complex being approximately 150 μM. Unfractionated tRNA containing only minute quantities of tRNAMet fails to form complexes with ApUpGp to a detectable extent thus suggesting that the binding ability for this triplet is displayed solely by methionine accepting tRNAs.Deacylation of tRNA appears not to interfere with its complex forming ability. The strength of a trinucleotide—tRNA interaction is not altered measurably if the terminal phosphate group is detached from the triplets.The observed binding phenomenon is interpreted as a codon—anticodon interaction in the absence of ribosomes.

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