A model of myoglobin self-organization

Area of Science:

• Protein folding and biophysics

Background:

• Understanding protein self-organization is crucial for deciphering biological functions.
• Myoglobin's tertiary structure formation provides a model for protein folding studies.

Purpose of the Study:

• To investigate the step-wise self-organization mechanism of myoglobin's helical regions.
• To model the formation of compact tertiary structures based on specific folding pathways.

Main Methods:

• Simulating self-organization pathways of myoglobin.
• Selecting favorable structures based on hydrophobic and hydrophilic group exposure at each step.
• Comparing simulated structures with the native myoglobin tertiary structure.

Main Results:

• The self-organization process was modeled through distinct pathways.
• Favorable structures were identified by maximizing dehydrated hydrophobic groups and exposed hydrophilic groups.
• One simulated pathway yielded a structure closely resembling native myoglobin.

Conclusions:

• The step-wise self-organization mechanism, initiated by "crystallization centers," can explain myoglobin tertiary structure formation.
• The proposed model successfully predicts a native-like protein structure, supporting the hypothesis of sequential folding events.