Sub-angstrom modeling of complexes between flexible peptides and globular proteins

Area of Science:

• Computational Biology
• Structural Biology
• Biochemistry

Background:

• Cellular regulatory processes involve flexible peptides binding to proteins.
• Modeling these interactions is challenging due to peptide flexibility and conformational diversity.

Purpose of the Study:

• Introduce Rosetta FlexPepDock, a novel computational tool.
• Enhance the modeling of peptide-protein interactions at high resolution.

Main Methods:

• Developed Rosetta FlexPepDock for refining coarse peptide-protein models.
• Allowed significant backbone and side-chain conformational changes.
• Validated on a benchmark of 89 peptide-protein interactions.

Main Results:

• Achieved high-resolution models, often with sub-angstrom backbone accuracy.
• Side chains of binding motifs were modeled with atomic accuracy.
• Improved cross-docking performance for PDZ domains.

Conclusions:

• Rosetta FlexPepDock provides accurate models for diverse peptide-protein complexes.
• Enables structure-based functional characterization and peptide interaction manipulation.
• Facilitates advancements in peptide-based drug design.