Nontargeted Parallel Cascade Selection Molecular Dynamics Based on a Nonredundant Selection Rule for Initial...

Area of Science:

• Computational Biology
• Biophysics
• Molecular Dynamics

Background:

• Nontargeted parallel cascade selection molecular dynamics (nt-PaCS-MD) is a method for enhanced protein conformational sampling.
• The efficiency of nt-PaCS-MD relies on the selection rule for initial structures used in resampling cycles.
• The original nt-PaCS-MD method did not account for structural redundancy among selected initial structures, potentially leading to inefficient sampling.

Purpose of the Study:

• To develop an improved selection rule for nt-PaCS-MD that minimizes structural redundancy in initial structures.
• To enhance the conformational sampling efficiency of nt-PaCS-MD by incorporating a history-dependent selection strategy.
• To evaluate the performance of the new method, termed extended nt-PaCS-MD, using T4 lysozyme.

Main Methods:

• Proposed an alternative selection rule for nt-PaCS-MD that considers pairwise root-mean-square deviation (RMSD) among past initial structures.
• Implemented a history-dependent selection scheme to sequentially choose diverse protein configurations for resampling.
• Applied the extended nt-PaCS-MD method to simulate T4 lysozyme in explicit water.

Main Results:

• The extended nt-PaCS-MD successfully prevented resampling of redundant protein configurations.
• The method demonstrated improved conformational sampling efficiency compared to the original nt-PaCS-MD.
• Specifically, extended nt-PaCS-MD identified the open-closed transitions of T4 lysozyme more efficiently.

Conclusions:

• The history-dependent selection rule in extended nt-PaCS-MD effectively reduces structural redundancy in protein conformational sampling.
• Extended nt-PaCS-MD offers a more efficient approach for exploring protein conformational landscapes.
• This method holds promise for advancing molecular dynamics simulations in biophysical studies.