Construction of Histone-Protein Complex Structures by Peptide Growing

Area of Science:

• Epigenetics
• Structural Biology
• Computational Chemistry

Background:

• Histone complexes are crucial for epigenetics, but determining their structures is difficult due to weak interactions between flexible histone tails and reader proteins.
• Accurate structural data is essential for understanding epigenetic regulation and developing targeted therapies.

Purpose of the Study:

• Introduce a novel computational protocol, PepGrow, for determining atomic-resolution structures of histone-reader complexes.
• Address the challenges associated with the flexibility of histone peptides and weak binding interactions.

Main Methods:

• PepGrow utilizes docked histone fragments as seeds, growing full peptide tails within the reader-binding pocket.
• Combines AutoDock for initial fragment docking and Modeller's building algorithm for peptide extension.
• Employs a novel in situ ligand growing strategy.

Main Results:

• PepGrow successfully generates atomic-resolution structures of histone-reader complexes.
• Demonstrates superior efficiency compared to linking pre-docked peptide fragments.
• Handles the inherent flexibility of histone peptides effectively.

Conclusions:

• In situ growing of ligands from seeds is a viable and efficient strategy for producing complex histone peptide structures.
• PepGrow offers a fast and effective method for obtaining high-resolution structural insights into epigenetic mechanisms.