Dynamic Coupling and Entropy Changes in KRAS G12D Mutation: Insights into Molecular Flexibility, Allostery and...

Area of Science:

• Molecular Biology
• Biophysics
• Computational Biology

Background:

• The KRAS G12D mutation is a key driver in cancer progression.
• The precise mechanisms by which this mutation affects KRAS protein dynamics and function are not fully understood.

Purpose of the Study:

• To investigate how the G12D mutation impacts KRAS conformational landscape and residue interactions.
• To elucidate the molecular dynamics underlying KRAS-driven cancer activation.

Main Methods:

• Utilized molecular dynamics simulations.
• Performed entropy calculations and mutual information (MI) analysis.
• Analyzed changes in protein dynamics and residue-residue coupling.

Main Results:

• The G12D mutation increases local entropy at critical residues (D12, Y32, G60, Q61).
• Disruption of structural alignment necessary for GTP hydrolysis was observed.
• Enhanced dynamic coupling between distant residues suggests stabilization of the active state through new long-range interactions.

Conclusions:

• The G12D mutation reconfigures KRAS's dynamic network, causing persistent activation via enhanced residue coupling.
• Findings suggest novel therapeutic strategies focused on modulating protein dynamics, rather than solely targeting binding sites, for KRAS-driven cancers.