Atomic-level characterization of protein-protein association

Area of Science:

• Biochemistry
• Structural Biology
• Computational Biology

Background:

• Protein-protein complexes are crucial for biological functions.
• Determining their structures and association mechanisms is challenging.

Purpose of the Study:

• To investigate protein-protein association mechanisms using atomic-level simulations.
• To identify common features in the native association of diverse protein pairs.

Main Methods:

• Employed molecular dynamics (MD)-based sampling to observe protein complex formation without prior structural information.
• Conducted conventional MD simulations to study spontaneous association events.

Main Results:

• Observed five protein-protein pairs repeatedly forming their native complexes.
• Found that native association often involves dissociation and reassociation near the native interface.
• Identified the transition state characterized by hydrated interfaces and limited native contacts (<20%).

Conclusions:

• Native protein complex formation follows a conserved mechanism involving dissociation and reassociation.
• The transition state of association is largely unstructured and hydrated, preceding significant contact formation.