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Constant-pH Simulation of the Human β2 Adrenergic Receptor Inactivation.

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pH affects G protein-coupled receptor (GPCR) signaling. This study reveals how pH influences the β2 adrenergic receptor (β2AR) inactivation via protonation and sodium ion interactions, challenging current models.

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Area of Science:

  • Molecular pharmacology
  • Computational biophysics
  • Structural biology

Background:

  • G protein-coupled receptors (GPCRs) mediate crucial physiological processes.
  • GPCR signaling is influenced by environmental factors like pH.
  • The human β2 adrenergic receptor (β2AR) is a key target for understanding pH-dependent GPCR function.

Purpose of the Study:

  • To elucidate the atomistic mechanisms of β2AR inactivation across physiological pH ranges (4-9).
  • To investigate the role of protonation and sodium ion binding in β2AR conformational changes.
  • To challenge and refine existing models of GPCR inactivation.

Main Methods:

  • Constant-pH molecular dynamics simulations.
  • Atomistic characterization of receptor dynamics.
  • Analysis of residue protonation states and ion-binding interactions.

Main Results:

  • β2AR inactivation is strongly correlated with protonation of key residues, including E2686×30, affecting the ionic lock.
  • Sodium ions do not bind to the canonical ion-binding pocket (D792×50) during inactivation.
  • Sodium ions preferentially interact with D1133×32, hindering access to the inner binding site.

Conclusions:

  • Protonation events at specific residues are critical for pH-dependent β2AR inactivation.
  • The role of sodium ions in β2AR inactivation differs from current models.
  • Constant-pH simulations are essential for accurately modeling GPCR electrostatics and dynamics, impacting drug design.