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Response-Retaliation Behavior in Synthetic Protocell Communities.

Yan Qiao1,2, Mei Li1, Dong Qiu2

  • 1Centre for Protolife Research and Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK.

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Summary

This study demonstrates a tit-for-tat mechanism in artificial protocells. A glucose signal triggers a chain reaction leading to the destruction of one protocell type and the inhibition of another.

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coacervateenzymeproteinosomeresponse-retaliation behaviorsynthetic protocell

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Area of Science:

  • Synthetic biology
  • Protocell research
  • Biochemical networks

Background:

  • Artificial protocells offer a platform for studying primitive life-like behaviors.
  • Enzyme-mediated interactions can drive complex dynamics in protocell consortia.
  • Understanding self-sustaining and responsive systems is key to synthetic biology.

Purpose of the Study:

  • To engineer a simple tit-for-tat mechanism in a ternary protocell network.
  • To investigate enzyme-mediated antagonistic interactions between different protocell types.
  • To explore programmable response-retaliation behavior in artificial consortia.

Main Methods:

  • Constructed a ternary protocell network with distinct components: glucose-oxidase proteinosomes, protease-containing coacervates, and polymer/polysaccharide coacervates.
  • Utilized pH-sensitive and protease-sensitive interactions to couple protocell behavior.
  • Introduced a glucose signal to initiate a cascade of events.

Main Results:

  • A glucose signal triggered proton secretion, leading to the disassembly of protease-containing coacervates.
  • Released protease from coacervates degraded proteinosome-adhered coacervates, causing delayed killing of proteinosomes.
  • This sequence established a tit-for-tat interaction, inhibiting glucose oxidase activity.

Conclusions:

  • Demonstrated a functional tit-for-tat mechanism in an artificial protocell system.
  • Showcased programmable response-retaliation behavior through enzyme-mediated interactions.
  • This work represents a step towards creating complex mesoscale dynamics in synthetic protocell consortia.