Abstract
The historical origin of the translation machinery remainsunresolved. Although the large 23S ribosomal RNA (rRNA) is almost certainly the catalytic component of the peptidyl transferase center in the modern ribosome, it is likely thatgreatly simplified systems were initially employed in the latestages of the prebiotic world. In particular, it has been suggested that small RNAs carrying amino acids were important forthe genesis of protein synthesis. Consistent with this, adipeptide, Ala-His, was previously claimed to be a prebioticallyfeasible catalyst mediating peptide bond formation in thepresence of aminoacylated tRNA and cognate mRNA template, in theabsence of other ribosomal components (Shimizu, 1996). We hereinreport a detailed study of putative dipeptide formation by Ala-His and RNAs carrying leucine. Based on the results presentedhere, it is unlikely that the dipeptide, Ala-His, catalyzessignificant levels of Leu-Leu dipeptide formation in solution. Aproduct is produced which can be readily mistaken for a dipeptidein the TLC separation systems employed in earlier work. We offerexplanations for the formation of this product as well as anotherunexpected product. The results presented here are consistentwith the notion that the translation machinery was likely basedon catalytic RNA from its very inception.
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Larkin, D.C., Martinis, S.A., Roberts, D.J. et al. Ala-His Mediated Peptide Bond Formation Revisited. Orig Life Evol Biosph 31, 511–526 (2001). https://doi.org/10.1023/A:1012770720410
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DOI: https://doi.org/10.1023/A:1012770720410