Minimum active structure of insulin-like peptide 5

Area of Science:

• Endocrinology
• Peptide Chemistry
• Metabolic Research

Background:

• Insulin-like peptide 5 (INSL5) is a peptide hormone with potential therapeutic applications for obesity, diabetes, and eating disorders.
• High expression in the colon suggests roles in motility and appetite, with recent studies indicating involvement in insulin secretion and beta-cell homeostasis.
• Native INSL5 synthesis is challenging due to poor solubility of the A-chain and aggregation of the B-chain, complicating purification.

Purpose of the Study:

• To develop a simplified and more easily synthesized analogue of INSL5.
• To create a functional mimetic of INSL5 for further research into its physiological roles.

Main Methods:

• Design of a novel INSL5 analogue with a simplified structure.
• Reduction of disulfide bonds from three to two to facilitate assembly and purification.

Main Results:

• A highly active INSL5 analogue with a simpler, two-disulfide bond structure was successfully developed.
• The simplified analogue is easier to assemble and handle compared to native INSL5.

Conclusions:

• The developed INSL5 analogue offers a viable alternative for studying INSL5 function.
• This mimetic peptide presents an attractive tool for investigating INSL5's role in metabolic regulation and potential therapeutic applications.