De novo designed peptides for cellular delivery and subcellular localisation

Area of Science:

• Synthetic biology
• Protein engineering
• Cellular delivery systems

Background:

• Designing de novo peptide and protein assemblies from first principles is advancing synthetic polypeptide development.
• Current methods primarily focus on in vitro applications, posing challenges for intracellular delivery.
• Efficiently delivering synthetic polypeptides to specific cellular locations remains a significant hurdle.

Purpose of the Study:

• To design, characterize, and demonstrate the intracellular delivery and subcellular targeting capabilities of a novel de novo synthetic peptide system.
• To create a dual-function peptide for cell penetration and target binding, coupled with a complementary peptide for protein fusion.
• To validate the system's utility in mammalian cells for organelle marking and functional protein complex engagement.

Main Methods:

• De novo computational design of a dual-function basic peptide and a complementary acidic peptide.
• In vitro characterization using biophysical methods and X-ray crystallography.
• Demonstration of intracellular delivery and subcellular localization in mammalian cells.

Main Results:

• Successful design and characterization of a synthetic peptide system with dual functionality (cell penetration and target binding).
• Demonstrated efficient intracellular delivery of the peptide system into mammalian cells.
• Validated subcellular targeting by marking organelles and engaging functional protein complexes.

Conclusions:

• The developed de novo synthetic peptide system offers a promising new strategy for targeted intracellular delivery of proteins.
• This system overcomes previous limitations by enabling efficient delivery and precise subcellular localization of synthetic polypeptides.
• The findings open avenues for advanced applications in cell biology and therapeutic development.