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The functional regulatory details of ERK2 in complex with RSK1: an in silico insight

Sepideh Jafari1, Farzaneh Mohamadi Farsani1, Maziar Ganji2

  • 1Department of Cell and Molecular Biology, Faculty of Biological Science and Technology, University of Isfahan Isfahan Iran m.ganjalikhany@sci.ui.ac.ir +98-31-37932250 +98-31-37932250.

RSC Advances
|April 15, 2022
PubMed

Insights

Extracellular signal-regulated kinase 2 (ERK2) acts as a switch in cellular signaling. Active ERK2 prepares for substrate binding, while inactive ERK2 closes its active site, halting phosphorylation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Protein kinases regulate cellular activation through phosphorylation.
  • Extracellular signal-regulated kinase 2 (ERK2) is a key kinase in the mitogen-activated protein kinase (MAPK) cascade, controlling cell proliferation, differentiation, survival, and migration.
  • Understanding macromolecular dynamics is crucial for elucidating biological processes.

Purpose of the Study:

  • To investigate the conformational dynamics of ERK2 in active, inactive, and substrate-bound states.
  • To determine the functional characteristics of ERK2 conformations using computational methods.
  • To elucidate the regulatory role of ERK2 in cellular signaling pathways.

Main Methods:

  • Molecular dynamic simulation
  • Normal mode analysis
  • Investigation of ERK2 active (phosphorylated) and inactive (unphosphorylated) forms
  • Analysis of ERK2 in complex with its substrate, ribosomal protein S6 kinase alpha-1 (RSK1)

Main Results:

  • Active ERK2 conformations exhibit shifts in critical regions, facilitating substrate acceptance and catalytic action.
  • Inactive ERK2 conformations show motions that close the catalytic site, inhibiting phosphorylation.
  • ERK2 functions as a molecular switch, regulating MAPK cascade activity based on its phosphorylation state.

Conclusions:

  • ERK2's conformational changes are central to its regulatory role in the MAPK pathway.
  • The study provides insights into novel molecular targets and the mechanism of ERK2-mediated phosphorylation.
  • Findings align with existing research, reinforcing the switch-like function of ERK2.

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