Gene

Catalysis

Amino acid

Biology

Materials science

Peptide

Abiogenesis

Biochemistry

Autocatalysis

Dissolution

Polymer

Biopolymer

Genetics

Coacervate

Nanotechnology

Organic chemistry

Membrane

Artificial cell

Prebiotic

Protocell

Chemistry

Monomer

Nucleation

Biophysics

Nature Communications

The hypothesis that prebiotic molecules were transformed into polymers that evolved into proliferating molecular assemblages and eventually a primitive cell was first proposed about 100 years ago. To the best of our knowledge, however, no model of a proliferating prebiotic system has yet been realised because different conditions are required for polymer generation and self-assembly. In this study, we identify conditions suitable for concurrent peptide generation and self-assembly, and we show how a proliferating peptide-based droplet could be created by using synthesised amino acid thioesters as prebiotic monomers. Oligopeptides generated from the monomers spontaneously formed droplets through liquid–liquid phase separation in water. The droplets underwent a steady growth–division cycle by periodic addition of monomers through autocatalytic self-reproduction. Heterogeneous enrichment of RNA and lipids within droplets enabled RNA to protect the droplet from dissolution by lipids. These results provide experimental constructs for origins-of-life research and open up directions in the development of peptide-based materials.

Proliferating coacervate droplets as the missing link between chemistry and biology in the origins of life