Design of Fuel-Dependent, Complex-Coacervate-Based Synthetic Cells

Area of Science:

• Synthetic Biology
• Biochemistry
• Materials Science

Background:

• Fuel-dependent synthetic cells require fuel for emergence and sustenance, decaying under starvation.
• Previous designs faced challenges with waste product accumulation and unknown lifetime parameters.
• Droplet-based synthetic cells offer a promising route towards synthetic life.

Purpose of the Study:

• To establish design rules for chemically fueled complex coacervate droplets using hexapeptides.
• To investigate parameters influencing synthetic cell lifetime and division capabilities.
• To overcome waste accumulation issues in fuel-dependent synthetic cell designs.

Main Methods:

• Utilized hexapeptides with a focus on incorporating tryptophan for enhanced polyanion affinity.
• Investigated the impact of tryptophan placement within the peptide sequence on droplet properties.
• Employed RNA as a polyanion to assess offspring production and waste resistance.

Main Results:

• Tryptophan incorporation significantly increased peptide affinity for polyanions, improving droplet formation and stability.
• Synthetic cells demonstrated extended lifetimes and enhanced resistance to waste product accumulation.
• RNA-compatible synthetic cells successfully produced offspring, indicating improved functionality.

Conclusions:

• Design rules for tryptophan-containing hexapeptides yield more robust and functional fuel-dependent synthetic cells.
• These advancements facilitate the creation of waste-resistant, RNA-compatible systems for synthetic life studies.
• The findings pave the way for next-generation synthetic cells with improved longevity and reproductive capabilities.