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Related Concept Videos

Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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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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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Adrenergic Receptors: β Subtype01:26

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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 Gated Ion Channels01:21

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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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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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Updated: Sep 9, 2025

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Dynamic Interactions in the Human β1AR Signalling Complex with Mini-Gs Revealed by NMR.

Philip Rößler1, Marco M Ruckstuhl1, Arnelle Löbbert1

  • 1Institute of Biochemistry, Department of Biology, ETH Zürich 8093 Zürich, Switzerland.

Journal of Molecular Biology
|September 1, 2025
PubMed
Summary
This summary is machine-generated.

Researchers studied a stabilized human beta-1 adrenergic receptor (β1AR) to understand its signaling. They found the human receptor is flexible, and its G protein partner moves faster within the active complex.

Keywords:
GPCRNMRdynamicshuman beta 1 adrenergic receptorsignalling complex

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Pharmacology

Background:

  • G protein-coupled receptors (GPCRs) are crucial drug targets.
  • Previous studies used turkey β1AR for insights.
  • Understanding human β1AR activation is vital for drug development.

Purpose of the Study:

  • Investigate a stabilized human β1AR construct.
  • Elucidate the active signaling complex with mini-Gs.
  • Compare human β1AR dynamics to avian counterparts.

Main Methods:

  • Biophysical studies of a stabilized human β1AR.
  • Utilized G protein surrogate mini-Gs.
  • Analysis of conformational flexibility and dynamics.

Main Results:

  • Human β1AR shows greater flexibility than turkey β1AR.
  • The receptor transitions between inactive and pre-active states.
  • Bound mini-Gs exhibits faster dynamics in the ternary complex.
  • Identified distinct states of intracellular loop 2 and helix 1.
  • Intracellular loop 3 is critical for mini-Gs binding.

Conclusions:

  • The human β1AR construct is a valuable tool for atomic-level biophysical studies.
  • Provides insights into the dynamic behavior of the human β1AR signaling complex.
  • Highlights differences in dynamics between the receptor and its G protein partner.