A coarse-grained alpha-carbon protein model with anisotropic hydrogen-bonding

Area of Science:

• Computational Biology
• Biophysics
• Protein Folding

Background:

• Protein structure prediction and folding mechanisms are crucial for understanding biological function.
• Existing models often require detailed experimental data or lack accuracy in capturing thermodynamic properties.

Purpose of the Study:

• To develop a novel sequence-based alpha-carbon model for protein folding.
• To incorporate orientation dependence of polypeptide chains for stabilizing secondary structures (alpha-helices and beta-sheets).

Main Methods:

• Development of a sequence-based alpha-carbon model.
• Inclusion of a mean field estimate for orientation dependence.
• Application of the model to proteins L and G to assess thermodynamic measures and folding mechanisms.

Main Results:

• The new model successfully captures thermodynamic measures and folding mechanisms for proteins L and G.
• Demonstrated improved folding cooperativity and protein sequence designability compared to previous models.
• Predicted correct trends for kinetic rates and folding mechanisms.

Conclusions:

• The developed model offers enhanced accuracy and broader applicability to protein folding and assembly processes.
• It serves as a mid-resolution model for conformational searches, bridging to atomic descriptions.
• The model does not necessitate experimental input beyond native state topology.