Symmetry Breaking by Consecutive Amplification: Efficient Paths to Homochirality

To understand chiral symmetry breaking on the molecular level, we developed a method to efficiently investigate reaction kinetics of single molecules. The model systems include autocatalysis as well as a reaction cascade to gain further insight into the prebiotic origin of homochirality. The simulated reactions start with a substrate and only a single catalyst molecule, and the occurrence of symmetry breaking was examined for its degree of dependence on randomness. The results demonstrate that interlocking processes, which e.g., form catalysts, autocatalytic systems, or reaction cascades that build on each other and lead to a kinetic acceleration, can very well amplify a statistically occurring symmetry breaking. These results suggest a promising direction for the experimental implementation and identification of such processes, which could have led to a shift out of thermodynamic equilibrium in the emergence of life.

Automated summary

This study developed a method to investigate the reaction kinetics of single molecules in order to understand chiral symmetry breaking at the molecular level. The results showed that interlocking processes can amplify the occurrence of symmetry breaking, providing a promising direction for experimental implementation and identification of these processes.