Stability of recombinant human epidermal growth factor in various solutions

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Chemistry

Background:

• Recombinant human epidermal growth factor (hEGF) is a vital signaling protein.
• Understanding hEGF stability is crucial for its therapeutic and research applications.
• Degradation can impact the efficacy and function of hEGF.

Purpose of the Study:

• To investigate the stability of recombinant hEGF in different solution conditions.
• To identify degradation products and understand their formation pathways.
• To determine the structural and functional consequences of hEGF degradation.

Main Methods:

• Incubation of recombinant hEGF in phosphate buffered saline, acetic acid, human serum, and pepsin/HCl.
• Analysis of degradation products using biochemical and biophysical techniques.
• Assessment of receptor binding activity of native and degraded hEGF.

Main Results:

• Spontaneous, temperature-dependent degradation of hEGF occurred in PBS and acetic acid.
• Enzymatic degradation was observed in human serum and pepsin/HCl.
• Degradation products were identified, and their structures were analyzed.
• Asp11 and Trp50 residues were identified as critical for receptor binding.

Conclusions:

• Recombinant hEGF exhibits limited stability in common laboratory solutions.
• Temperature and enzymatic activity significantly influence hEGF degradation.
• The identified residues are key to maintaining hEGF's biological function.