Engineering and identifying supercharged proteins for macromolecule delivery into mammalian cells

Area of Science:

• Biochemistry and Molecular Biology
• Protein Engineering
• Cellular and Molecular Medicine

Background:

• Proteins with extreme net charges, termed supercharged proteins, demonstrate enhanced stability against aggregation.
• Superpositively charged proteins possess the unique ability to permeate mammalian cell membranes.
• Current macromolecule delivery methods face limitations in efficiency and scope.

Purpose of the Study:

• To summarize the engineering of supercharged proteins.
• To outline methods for optimizing their cell-penetrating capabilities.
• To explore their application in delivering macromolecules into mammalian cells.

Main Methods:

• Engineering of supercharged proteins with high positive or negative net charge.
• Optimization of protein cell penetration characteristics.
• Identification of naturally occurring supercharged proteins.
• Association of cargo molecules (DNA, siRNA, proteins) with supercharged proteins.

Main Results:

• Supercharged proteins exhibit remarkable resistance to thermal and chemical aggregation.
• Superpositively charged proteins effectively penetrate mammalian cells.
• Functional delivery of macromolecules via supercharged proteins can surpass existing methods like Tat peptides and adenoviral vectors.

Conclusions:

• Supercharged proteins represent a promising platform for efficient macromolecule delivery into mammalian cells.
• Their engineered stability and cell-penetrating properties offer advantages over current technologies.
• Further research into engineering and application holds significant potential for therapeutic and research purposes.