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Finite Element Modelling of a Cellular Electric Microenvironment

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Published on: May 18, 2021

Factors determining electrostatic fields in molecular dynamics simulations of the Ras/effector interface.

Daniel L Ensign¹, Lauren J Webb

¹Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712, USA.

|July 13, 2011

Summary

Molecular dynamics simulations reveal electrostatic fields at the Ras-RalGDS binding interface. These fields are primarily due to Ras binding, not effector rearrangement, supporting experimental findings.

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Area of Science:

Biophysics
Computational Biology
Molecular Interactions

Background:

Guanine nucleotide exchange factors (GEFs) like Ral guanine nucleotide dissociation stimulator (RalGDS) are crucial downstream effectors of GTPase Ras.
Understanding the Ras-RalGDS interaction is key to deciphering cellular signaling pathways.
Vibrational Stark effect spectroscopy is a sensitive technique for probing electrostatic fields in biological systems.

Purpose of the Study:

To computationally investigate the electrostatic fields at the Ras-RalGDS binding interface using molecular dynamics simulations.
To determine the geometric and physical factors contributing to these electrostatic fields.
To support experimental hypotheses regarding the origin of vibrational Stark shifts observed in Ras-effector interactions.

Main Methods:

Molecular dynamics (MD) simulations were performed using the AMBER 2003 force field.
Electrostatic fields were calculated by averaging over MD simulation snapshots.
Geometric factors, such as probe orientation, and physical contributions from solvent and protein residues were analyzed.

Main Results:

Calculated electrostatic fields at the binding surface of Ras and RalGDS were analyzed.
Contributions to the electrostatic field from explicit solvent, Ras residues, and RalGDS residues were compared.
The results support the hypothesis that Ras binding, rather than effector structural changes, is the primary cause of observed vibrational Stark shifts.

Conclusions:

Molecular dynamics simulations provide physical insight into electrostatic fields governing protein-protein interactions.
Ras binding to its effector is a significant determinant of electrostatic fields at the interface.
These findings suggest new experimental avenues to explore the role of electrostatic fields in protein docking.