Communication: Simulated tempering with fast on-the-fly weight determination.

Area of Science:

• Computational chemistry
• Molecular dynamics
• Biophysics

Background:

• Enhanced sampling techniques are crucial for molecular simulations.
• Simulated tempering (ST) and replica exchange molecular dynamics (REMD) are widely used.
• Efficient weight determination remains a challenge in ST.

Purpose of the Study:

• To develop an efficient on-the-fly weight determination scheme for simulated tempering.
• To eliminate the need for prior trial simulations and complex update protocols in ST.
• To demonstrate the advantages of the proposed ST method over REMD.

Main Methods:

• Combining simulated tempering with a fast on-the-fly weight determination scheme.
• Self-updating weights using a trapezoid rule during the simulation.
• Applying the method to study peptide folding and aggregation.

Main Results:

• The proposed scheme significantly enhances sampling efficiency in computer simulations.
• It requires no prior trial simulations or complicated update schemes.
• Demonstrated advantages over replica exchange molecular dynamics for specific peptide systems.

Conclusions:

• The novel ST method offers an efficient and simplified approach to enhance molecular simulations.
• This method provides a practical alternative to existing enhanced sampling techniques.
• It shows promise for studying complex biological systems like protein folding and aggregation.