Synthetic Membrane Shaper for Controlled Liposome Deformation

Area of Science:

• Biochemistry
• Cell Biology
• Nanotechnology

Background:

• Cellular membrane shape is crucial for biological processes like cell division and organelle function.
• Reconstituting protein machinery in vitro to stabilize or resolve complex membrane shapes is essential for understanding their roles.
• Existing methods lack the precision to generate specific deformed liposome structures for functional studies.

Purpose of the Study:

• To develop a novel DNA nanotechnology-based tool, the synthetic membrane shaper (SMS), for reproducible generation of specific liposome membrane shapes.
• To investigate the utility of SMS in studying the function of protein machineries involved in membrane deformation.
• To facilitate in vitro reconstitution of protein complexes on complex membrane geometries.

Main Methods:

• Developed SMS using cholesterol-linked DNA structures to attach to liposome membranes.
• Utilized in silico simulations to confirm the shape-stabilizing properties of SMS.
• Assembled bacterial divisome proteins (DynaminA, FtsZ:ZipA) on SMS-generated membrane structures.

Main Results:

• SMS reproducibly generated high yields of stomatocyte and dumbbell-shaped liposomes.
• In silico simulations validated the shape-stabilizing effect of SMS.
• Demonstrated compatibility of SMS with in vitro protein reconstitution, successfully assembling bacterial divisome proteins at the membrane neck.

Conclusions:

• The synthetic membrane shaper (SMS) is a versatile tool for creating and stabilizing complex liposome membrane geometries.
• SMS enables the study of protein binding and function on non-planar membrane structures.
• This approach significantly benefits synthetic cell research by providing a method to investigate protein-membrane interactions in controlled, complex environments.