Novel modified beta-interferons: gene cloning, expression, and biological activity in bacterial extracts

Area of Science:

• Biotechnology
• Immunology
• Molecular Biology

Background:

• Human beta-interferon is a crucial cytokine with antiviral and antiproliferative properties.
• Genetic engineering offers opportunities to modify protein structure and function.

Purpose of the Study:

• To create and characterize novel modified interferons based on human beta-interferon.
• To evaluate the antiviral and antiproliferative activities of these engineered interferons.

Main Methods:

• Construction of modified interferon genes using natural, synthetic, or combined sequences.
• Expression of novel interferons in Escherichia coli.
• Assay of antiviral and antiproliferative activities, and reactivity with monoclonal antibodies.

Main Results:

• 23 out of 25 novel interferons displayed both antiviral (AV) and antiproliferative (AP) activity.
• Activities ranged from 3-230% (AV) and 8-490% (AP) compared to native beta-interferon.
• Amino acid substitutions in regions 2-7 or 28-46 significantly increased AP activity.
• Most modified interferons retained reactivity with a neutralizing beta-interferon monoclonal antibody.

Conclusions:

• Novel modified interferons can be successfully expressed and exhibit potent biological activities.
• Specific amino acid modifications can enhance antiproliferative effects, suggesting targeted therapeutic potential.
• These engineered interferons represent promising candidates for further investigation in immunotherapy.