A computational peptide model induces cancer cells' apoptosis by docking Kringle 5 to GRP78

Area of Science:

• Biochemistry
• Molecular Biology
• Cancer Research

Background:

• Apoptosis is crucial for normal cell function but its dysregulation contributes to cancer.
• Elevated levels of 78-kDa glucose-regulated protein (GRP78) on cancer cell surfaces are linked to cancer progression.
• Kringle 5, an apoptosis-inducing agent, interacts with GRP78 on cancer cells.

Purpose of the Study:

• To investigate the interaction between Kringle 5 and GRP78.
• To design a peptide that targets the Kringle 5 binding site on GRP78 for cancer therapy.

Main Methods:

• Molecular docking of Kringle 5 to GRP78 using ClusPro 2.0.
• Identification of interacting amino acids on Kringle 5.
• Design and 3D structure modeling of a peptide using PEP-FOLD3 web tool.

Main Results:

• The interaction involved three specific regions of Kringle 5.
• A novel peptide was designed, incorporating Kringle 5 interaction residues within a secondary structure.
• The 3D structure of the proposed peptide was successfully modeled.

Conclusions:

• The designed peptide demonstrated complete binding to the GRP78 binding site on Kringle 5.
• This peptide holds potential as an effective agent for inducing apoptosis in cancer cells.