Synthesis of RNA nucleotides in plausible prebiotic conditions from ab initio computer simulations

27 April 2018, Version 4
This content is a preprint and has not undergone peer review at the time of posting.


Understanding the mechanism of spontaneous formation of ribonucleotides under realistic prebiotic conditions is a key open issue of origins-of-life research. In cells, de novo and salvage nucleotide enzymatic synthesis combines 5-phospho-α -D-ribose-1-diphosphate ( α-PRPP) and nucleobases. Interestingly, these reactants are also known as prebiotically plausible compounds. Combining ab initio molecular dynamics simulations with recently developed reaction exploration and enhanced sampling methods, we show that nucleobases and α -PRPP should spontaneously combine, under mild hydrothermal conditions, with an exothermic reaction and a facile mechanism, forming both purine and pyrimidine ribonucleotides.
Surprisingly, this mechanism is very similar to the biological one, and yields ribonucleotides with the same anomeric carbon chirality as in biological systems.
These results suggest that natural selection might have optimized -- through enzymes -- a pre-existing ribonucleotide formation mechanism, carrying it forward to modern life forms.


Prebiotic Chemistry
Ab Initio Molecular Dynamics
Enhanced Sampling Simulations
hydrothermal environment

Supplementary materials



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