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Characterizing the MSMP-CCR2 Interaction through Molecular Dynamics Simulations and Machine Learning Approaches.

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MicroSeminoProtein (MSMP) overexpression drives cancer growth and therapy resistance. This study reveals how MSMP stabilizes the CCR2 receptor, offering new therapeutic targets for cancer treatment.

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Area of Science:

  • Molecular biology
  • Structural biology
  • Computational chemistry
  • Oncology

Background:

  • MicroSeminoProtein (MSMP) is overexpressed in prostate, ovarian, and breast cancers, particularly in tumors resistant to hormonal and antiangiogenic therapies.
  • MSMP expression is upregulated in hypoxic tumor microenvironments, promoting tumor growth.
  • MSMP interacts with the C-C chemokine receptor type 2 (CCR2), a G protein-coupled receptor (GPCR) on immune cells, stabilizing its active conformation and promoting tumor progression via MAP kinase signaling.

Purpose of the Study:

  • To elucidate the structural basis of the MicroSeminoProtein (MSMP)-C-C chemokine receptor type 2 (CCR2) interaction.
  • To understand how this interaction stabilizes the active conformation of CCR2 and facilitates downstream signaling.
  • To identify key residues and structural features involved in the MSMP-CCR2-G protein complex formation for potential therapeutic targeting.

Main Methods:

  • Utilized molecular modeling, molecular dynamics (MD) simulations, and machine learning (ML) techniques.
  • Generated high-resolution models of the MSMP-CCR2-G protein complex using AlphaFold2 and refined them with MD simulations.
  • Performed comparative analyses with CCL2-CCR2-G protein and unbound CCR2-G protein complexes, including binding free energy calculations and residue-level energy decomposition.

Main Results:

  • Identified key conformational rearrangements in CCR2 upon MSMP binding that stabilize its active state.
  • MSMP and CCL2 exhibited similar binding free energy profiles to CCR2, despite distinct binding modes.
  • Critical residues at the MSMP-CCR2 interface were identified, providing insights into receptor activation mechanisms. ML models highlighted structural features of stable MSMP-CCR2-G protein complexes.

Conclusions:

  • The study provides a detailed structural understanding of the MSMP-CCR2 interaction and its role in stabilizing the active receptor conformation.
  • Identified specific residues essential for maintaining the stability of the MSMP-CCR2-G protein complex.
  • These findings offer a structural basis for developing targeted therapies aimed at disrupting the MSMP-CCR2 interaction in cancer treatment.