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Related Concept Videos

Activation and Inactivation of G Proteins01:22

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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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Exploring the Activation Process of the β2AR-Gs Complex.

Chen Bai1,2, Junlin Wang2, Dibyendu Mondal1

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Journal of the American Chemical Society
|July 13, 2021
PubMed
Summary

G-Protein-coupled receptors (GPCRs) are vital for cell signaling and drug development. This study reveals that guanosine diphosphate (GDP) release from Gs protein occurs when the binding cavity is half open, a key step in GPCR activation.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Computational Chemistry

Background:

  • G-Protein-coupled receptors (GPCRs) are crucial integral membrane proteins mediating diverse cellular processes like vision and olfaction.
  • GPCRs are implicated in numerous diseases, making them significant drug targets.
  • Understanding the precise mechanism of GPCR activation, including nucleotide release and residue roles, remains a challenge.

Purpose of the Study:

  • To elucidate the mechanism of guanosine diphosphate (GDP) release from the Gs protein during GPCR activation.
  • To identify key residues on the alpha-5 (α5) helix involved in G protein coupling and binding specificity.
  • To validate computational predictions through experimental mutagenesis.

Main Methods:

  • Free energy analysis was employed to study the conformational changes of the Gs protein.
  • Computational simulations were used to analyze reaction barriers and the effects of mutations.
  • Site-directed mutagenesis was performed to validate the role of identified key residues.

Main Results:

  • Free energy analysis indicates GDP release from Gs protein occurs when the binding cavity is half open, during the transition to the Gs open state.
  • This transition represents the rate-determining step in the overall conformational change.
  • Computational findings accurately predicted experimentally observed effects of mutations on reaction barriers, highlighting the predictive power of the methodology.

Conclusions:

  • The study clarifies a critical step in GPCR activation: GDP release is linked to the half-open binding cavity state.
  • Identified key residues on the α5 helix are validated through mutagenesis, confirming their importance in G protein coupling.
  • The computational methodology demonstrates significant predictive value for complex biophysical systems and can be applied broadly.