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G Protein-coupled Receptors01:15

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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Practical considerations for building GROMOS-compatible small-molecule topologies.

Justin A Lemkul1, William J Allen, David R Bevan

  • 1Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States.

Journal of Chemical Information and Modeling
|December 2, 2010
PubMed
Summary
This summary is machine-generated.

Automated tools like PRODRG often fail to generate accurate molecular topologies for GROMOS force fields. Inconsistent charges lead to significant deviations in molecular dynamics simulations, impacting results for various systems.

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Area of Science:

  • Computational chemistry
  • Molecular modeling
  • Biophysics

Background:

  • Molecular dynamics (MD) simulations require accurate small-molecule topologies for reliable results.
  • Force fields, often developed for macromolecules, present transferability challenges for small molecules.
  • Automated topology generation tools are gaining traction, but their accuracy is often unverified.

Purpose of the Study:

  • To evaluate the PRODRG server's ability to generate small-molecule topologies for GROMOS force fields.
  • To assess the impact of PRODRG-generated charges on simulation accuracy.
  • To propose best practices for small-molecule parametrization in GROMOS.

Main Methods:

  • Assessment of PRODRG server for small-molecule topology generation.
  • Analysis of charge and charge group consistency within PRODRG topologies.
  • Evaluation of PRODRG-derived charges in MD simulations of pure liquids, amino acids, and enzyme-cofactor complexes.

Main Results:

  • PRODRG fails to reproduce accurate topologies even for well-established molecules within the GROMOS force field.
  • Inconsistencies in partial atomic charges and charge groups generated by PRODRG were identified.
  • Simulations using PRODRG-derived charges showed substantial deviations from expected behavior compared to standard GROMOS parameters.

Conclusions:

  • PRODRG-generated partial atomic charges are largely incompatible with GROMOS force fields.
  • The use of PRODRG can lead to inaccurate molecular dynamics simulation outcomes.
  • Recommendations for best practices in small-molecule parametrization for GROMOS are provided.