Lipid sponge droplets as programmable synthetic organelles

Area of Science:

• Biochemistry
• Synthetic Biology
• Materials Science

Background:

• Cellular life relies on organelles for compartmentalization and efficient biochemical reactions.
• Artificial cell research aims to replicate organelle functions using synthetic vesicles.
• Existing synthetic vesicles have limitations in membrane transport and mimicking complex organelle structures.

Purpose of the Study:

• To develop programmable synthetic organelles that overcome limitations of traditional vesicles.
• To create a platform for spatial organization and enhanced biochemical reactions in synthetic systems.
• To mimic the dense membrane networks and transport capabilities of natural organelles.

Main Methods:

• Utilized single-chain galactolipid and nonionic detergents to form stable, nonlamellar sponge phase droplets.
• Exploited the nanoporous structure of droplets for material exchange and molecular partitioning.
• Programmed macromolecule sequestration using functionalized amphiphiles and demonstrated protein integration.

Main Results:

• Lipid sponge droplets exhibit facile material exchange due to their nanoporous structure.
• Molecular partitioning within droplets is controlled by size, polarity, and binding motifs.
• Functional proteins were successfully harbored, leading to enhanced reaction rates and protease protection.
• Reversible and optically controlled protein interactions were engineered.

Conclusions:

• Lipid sponge droplets offer a versatile platform for creating programmable synthetic organelles.
• These droplets integrate membrane-rich environments and self-assembling spatial organization for biochemical systems.
• The findings advance the development of artificial cells with enhanced functionalities.