Detailed Explanation
Short cationic or amphipathic peptides (typically <30 residues) capable of crossing cell membranes and delivering cargo molecules into cells. The most famous CPP is the TAT peptide (GRKKRRQRRRPPQ) derived from HIV-1 TAT protein, discovered when researchers noticed the protein could enter cells spontaneously.
Other well-known CPPs include penetratin (from Drosophila Antennapedia homeodomain), polyarginine (R₈, R₉), and the designed peptide MAP. CPPs enter cells through a combination of direct membrane penetration and endocytosis. They are being developed as delivery vehicles for peptide drugs, siRNA, CRISPR components, imaging agents, and nanoparticles that otherwise cannot cross cell membranes.
Key Facts
- Short cationic or amphipathic peptides (typically <30 residues) capable of crossing cell membranes and delivering cargo molecules into cells.
- The most famous CPP is the TAT peptide (GRKKRRQRRRPPQ) derived from HIV-1 TAT protein, discovered when researchers noticed the protein could enter cells spontaneously.
- Other well-known CPPs include penetratin (from Drosophila Antennapedia homeodomain), polyarginine (R₈, R₉), and the designed peptide MAP.
- CPPs enter cells through a combination of direct membrane penetration and endocytosis.
- They are being developed as delivery vehicles for peptide drugs, siRNA, CRISPR components, imaging agents, and nanoparticles that otherwise cannot cross cell membranes.
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