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

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.