Total synthesis of interleukin-2 via a tunable backbone modification strategy

Area of Science:

• Biochemistry
• Organic Chemistry
• Protein Chemistry

Background:

• Chemical synthesis of hydrophobic proteins is difficult due to challenges in peptide synthesis, purification, and ligation.
• Existing methods require specialized peptide solubilizing strategies to facilitate protein total synthesis.

Purpose of the Study:

• To develop a novel and efficient strategy for the chemical synthesis of hydrophobic proteins.
• To address the limitations of current peptide synthesis and ligation techniques for complex proteins.

Main Methods:

• A tunable backbone modification strategy was employed, utilizing the adaptable stability of the Cys/Pen ligation intermediate.
• This approach allows for the straightforward introduction of a solubilizing tag.
• The strategy was validated through the total chemical synthesis of the protein interleukin-2.

Main Results:

• The developed strategy successfully facilitated both peptide purification and ligation processes.
• The tunable stability of the Cys/Pen ligation intermediate proved crucial for introducing the solubilizing tag.
• The chemical synthesis of interleukin-2 was achieved, demonstrating the practical applicability of the method.

Conclusions:

• The reported backbone modification strategy offers a robust solution for the chemical synthesis of hydrophobic proteins.
• This method simplifies purification and ligation, making protein total synthesis more accessible.
• The successful synthesis of interleukin-2 highlights the potential of this technique for producing challenging protein targets.