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Engineering Cell-permeable Protein
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Encoding extracellular modification of artificial cell membranes using engineered self-translocating proteins.

Alexander Harjung1, Alessandro Fracassi1, Neal K Devaraj2

  • 1Department of Chemistry and Biochemistry, University of California, San Diego, CA, USA.

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|October 31, 2024
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Summary

Researchers engineered artificial cells using modified proteins to display functional peptides on their surface. This breakthrough enables communication and assembly of synthetic cells without complex machinery.

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Area of Science:

  • Synthetic biology
  • Biotechnology
  • Cellular engineering

Background:

  • Artificial cell development offers insights into biological processes and drives innovation in medicine and biotechnology.
  • Encapsulating protein expression systems in lipid vesicles is a common method for creating artificial cells.
  • Effective communication requires protein translocation across lipid membranes, a challenge due to the complexity of natural translocase systems.

Purpose of the Study:

  • To develop a simple, genetically encodable system for external protein display on artificial cells.
  • To overcome the limitations of reconstituting complex translocase machinery in synthetic compartments.
  • To enable artificial cells to interact with their environment and assemble into functional structures.

Main Methods:

  • Modification of the membrane translocating loop of alpha-hemolysin (α-hemolysin).
  • Utilizing engineered pore-forming proteins for peptide translocation across lipid membranes.
  • Demonstrating translocation of functional peptides up to 52 amino acids without external translocase systems.

Main Results:

  • Achieved full membrane translocation of functional peptides in artificial cells.
  • Verified recognition of translocated peptides by specific binding ligands on the membrane.
  • Demonstrated the ability to genetically program artificial cells to display interacting peptide pairs.

Conclusions:

  • Engineered hemolysins provide a novel mechanism for membrane functionalization in artificial cells.
  • This system facilitates genetically programmed external display of peptides, enabling cell-cell interactions.
  • The technology supports the assembly of artificial cells into tissue-like structures, advancing synthetic biology applications.