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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Computational Biology

Background:

  • Previous studies indicated ERK2 dynamics change upon phosphorylation-induced activation.
  • Understanding the specific conformational motions involved in ERK2 activation remains incomplete.

Purpose of the Study:

  • To investigate the conformational dynamics of ERK2 using extensive molecular dynamics simulations.
  • To elucidate the role of the A-loop in ERK2 regulation and its coupling with active site dynamics.

Main Methods:

  • Conducted long conventional molecular dynamics (MD) simulations (totaling 727 μs) of phosphorylated (2P) and unphosphorylated (0P) ERK2.
  • Utilized differential contact network and principal component analyses to assess protein dynamics and conformational states.

Main Results:

  • Identified multiple long-lived conformational states (>5 μs) of the ERK2 A-loop in both 2P- and 0P-forms.
  • Revealed coupling between A-loop conformation and active site dynamics, with evidence of conformational selection in 2P-ERK2.
  • Observed distinct A-loop behaviors: restrained dynamics in 2P-ERK2 (N-lobe interactions) versus increased mobility in 0P-ERK2 (C-lobe excursions).

Conclusions:

  • The ERK2 A-loop dynamically switches conformations, directly influencing active site dynamics and kinase regulation.
  • Phosphorylation-dependent A-loop conformations modulate active site compaction and catalytic residue accessibility.
  • MD simulations reveal novel conformational states, enhancing the understanding of ERK2 activation mechanisms.