Cloning, expression and purification of human epidermal growth factor using different expression systems

Area of Science:

• Biochemistry
• Molecular Biology
• Oncology

Background:

• Epidermal growth factor (EGF) is crucial in cell signaling and implicated in carcinoma development.
• Potato carboxypeptidase inhibitor (PCI) exhibits EGF antagonist properties.
• The low affinity of PCI for the EGF receptor necessitates the development of improved antagonists.

Purpose of the Study:

• To design and produce EGF mutants with enhanced PCI-like inhibitory abilities.
• To investigate the impact of different expression systems on EGF production and activity.
• To establish a purification and refolding protocol for recombinant EGF.

Main Methods:

• Cloning and expression of native EGF using various systems.
• Development of a purification protocol for recombinant EGF.
• Refolding of purified EGF samples.

Main Results:

• Successful cloning, expression, and purification of native EGF.
• Variations in EGF yield and activity were observed across different expression systems.
• A functional refolding protocol was established for the purified protein.

Conclusions:

• The study successfully produced native EGF, laying the groundwork for developing EGF mutants.
• Expression system choice significantly impacts EGF yield and biological activity.
• Engineered EGF variants hold promise for developing novel carcinoma therapeutics.