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Functional water molecules in rhodopsin activation.

Xianqiang Sun1, Hans Ågren, Yaoquan Tu

  • 1Division of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology , S-106 91 Stockholm, Sweden.

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Water molecules are crucial for G-protein-coupled receptor (GPCR) activation. This study identifies key water positions in rhodopsin, revealing a hydration site that acts as a switch, and proposes a water-mediated activation pathway.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biophysics

Background:

  • G-protein-coupled receptors (GPCRs) are vital cell signaling proteins.
  • Rhodopsin, a prototype GPCR, highlights the potential role of water in activating Family A GPCRs.
  • Experimental limitations hinder a full understanding of water's function in GPCR activation.

Purpose of the Study:

  • To identify the precise locations of functional water molecules in different rhodopsin states (inactive, Meta II, active).
  • To elucidate the role of specific water molecules in the rhodopsin activation mechanism.
  • To propose a novel hypothesis for the water-mediated activation pathway of rhodopsin.

Main Methods:

  • Utilized all-atom molecular dynamics simulations.
  • Applied inhomogeneous fluid theory to analyze simulation data.
  • Interpreted thermodynamic signatures of water molecules to determine their functional roles.

Main Results:

  • Identified functional water molecule positions in inactive, Meta II, and constitutive active rhodopsin states.
  • Discovered a specific hydration site acting as a regulatory switch for key distances in rhodopsin activation.
  • Observed altered water molecule stability near the "NpxxY" motif in the Meta II state, correlating with network rearrangements.

Conclusions:

  • Water molecules play a critical, structurally defined role in rhodopsin activation.
  • A specific hydration site acts as a molecular switch, regulating receptor conformation.
  • The study proposes a detailed water-mediated pathway for rhodopsin activation, advancing GPCR signaling understanding.