Pepticombisomes: Biomimetic Vesicles Crafted From Recombinant Supercharged Polypeptides with Uniformly Distributed...

Area of Science:

• Synthetic biology
• Supramolecular chemistry
• Materials science

Background:

• Cell membranes are crucial for synthetic biology, enabling functions like transport and interaction control.
• Current synthetic membranes, such as liposomes, lack precise structural control, limiting their mimicry of natural cell membranes.
• Elastin-like supercharged unfolded polypeptides (SUPs) offer a versatile platform for creating novel biomaterials.

Purpose of the Study:

• To introduce pepticombs as a new class of supramolecular building blocks for synthetic membranes.
• To demonstrate the formation and characterize the properties of giant unilamellar vesicles (pepticombisomes) derived from pepticombs.
• To highlight the potential of pepticombisomes in advancing bottom-up synthetic biology.

Main Methods:

• Synthesis of pepticombs by appending anionic surfactants to recombinant elastin-like SUPs.
• Utilizing microscopy techniques (e.g., electron microscopy, fluorescence microscopy) to visualize and characterize pepticombisomes.
• Employing molecular dynamics simulations to understand membrane properties and self-assembly behavior.

Main Results:

• Demonstrated the successful formation of giant unilamellar vesicles (pepticombisomes) with controlled membrane properties.
• Pepticombisomes exhibit precise mimicry of natural cell membrane thickness and flexibility, surpassing classic polymersomes.
• Uniformity in pepticomb structure led to elastic heterogeneities and the formation of non-icosahedral faceted vesicles.
• Pepticombisomes can incorporate functional lipids, increasing design flexibility for synthetic membranes.

Conclusions:

• Pepticombs represent a significant advancement in creating biomimetic synthetic membranes with superior structural control.
• Pepticombisomes offer enhanced design flexibility and functionality for applications in bottom-up synthetic biology.
• This work paves the way for developing more sophisticated and functional artificial cell systems.