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Rethinking the MtInhA tertiary and quaternary structure flexibility: a molecular dynamics view.

Lucas Santos Chitolina1,2,3, Osmar Norberto de Souza1,3, Luiz Augusto Basso2,3

  • 1Laboratório de Bioinformática, Modelagem e Simulação de Biossistemas (LABIO), Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga 6681, Porto Alegre, RS, 90619-900, Brazil.

Journal of Molecular Modeling
|May 9, 2022
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Summary
This summary is machine-generated.

Restricting flexibility in specific loops of Mycobacterium tuberculosis 2-trans-enoyl-ACP reductase (MtInhA) created a monomeric model that accurately reflects the tetrameric structure. This offers a more efficient approach for drug discovery simulations.

Keywords:
FlexibilityMolecular dynamics simulationMtInhAMycobacterium tuberculosis

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Area of Science:

  • Biochemistry and Molecular Dynamics
  • Protein Structure and Function
  • Computational Biology

Background:

  • Protein flexibility and function are intrinsically linked, influencing biological activity.
  • Interactions and environmental factors can significantly alter protein plasticity.
  • The enzyme 2-trans-enoyl-ACP (CoA) reductase from Mycobacterium tuberculosis (MtInhA) is biologically active as a tetramer, but often studied computationally as a monomer.

Purpose of the Study:

  • To investigate the impact of flexibility restrictions on MtInhA's conformational behavior.
  • To develop a monomeric model that accurately represents the tetrameric structure for computational studies.
  • To enhance the reliability and efficiency of molecular docking and dynamics simulations for MtInhA.

Main Methods:

  • Computational simulations were performed on MtInhA.
  • Flexibility restrictions were applied to the A- and B-loops of the MtInhA monomer.
  • Simulations with restricted flexibility were compared to unrestricted simulations and the native tetrameric structure.

Main Results:

  • Simulations with restricted A- and B-loops exhibited behavior more similar to the native tetrameric structure.
  • A monomeric model of MtInhA was successfully developed, capturing the conformational characteristics of the active tetramer.
  • Restricted flexibility simulations showed improved correlation with the native structure compared to unrestricted simulations.

Conclusions:

  • Flexibility restrictions in key loops can yield a monomeric model representative of the tetrameric protein structure.
  • The developed monomeric model of MtInhA provides a more accurate and computationally efficient platform for drug discovery.
  • This approach facilitates more reliable molecular docking and extended molecular dynamics simulations for MtInhA.