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Published on: April 12, 2019
Atomistic Brownian dynamics simulation of peptide phosphorylation.
T Shen1, C F Wong, J A McCammon
1Department of Physics, Howard Hughes Medical Institute, University of California San Diego, La Jolla, CA 92093-0365, USA. tshen@ucsd.edu
We developed a new simulation method for peptide dynamics. Phosphorylation significantly alters peptide structure, impacting its function and how we interpret NMR data.
Area of Science:
- Computational Chemistry
- Molecular Dynamics
- Biophysics
Background:
- Understanding peptide conformational dynamics is crucial for drug discovery and protein function.
- Simulating peptide behavior requires efficient and stable computational methods.
- The LINCS algorithm is a key component in molecular dynamics simulations.
Purpose of the Study:
- To implement an all-atom Brownian dynamics simulation model for peptides using the LINCS algorithm.
- To investigate the effect of phosphorylation on the conformational preferences of the Gly-Ser-Ser-Ser peptide.
- To validate the simulation model by comparing computed NMR coupling constants with experimental data.
Main Methods:
- Utilized an all-atom Brownian dynamics simulation model integrated with the LINCS (LINear Constraint Solver) algorithm.
- Employed adaptive time steps within the UHBD (University of Houston Brownian Dynamics) software for computational efficiency and stability.
- Calculated Nuclear Magnetic Resonance (NMR) (3)J coupling constants using the Karplus equation from Brownian trajectories.
Main Results:
- The phosphorylation of the middle serine residue in Gly-Ser-Ser-Ser induced a significant conformational change from C(7eq) to alpha(R) structures.
- Computed (3)J coupling constants showed good agreement with experimental data for the singly phosphorylated peptide.
- The agreement between computed and experimental (3)J coupling constants was less precise for the doubly charged phosphorylated peptide.
Conclusions:
- The implemented LINCS-based Brownian dynamics model provides a valuable tool for studying peptide conformational changes.
- Phosphorylation is a critical post-translational modification that can drastically alter peptide structure and dynamics.
- The simulation model shows potential for predicting and interpreting NMR data, aiding in structural biology research.
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