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Related Concept Videos

G Protein-coupled Receptors01:15

G Protein-coupled Receptors

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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
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G-protein Coupled Receptors01:21

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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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Transducer Mechanism: G Protein–Coupled Receptors01:30

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G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
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Ligand Binding Sites02:40

Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
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The Two-State Receptor Model01:29

The Two-State Receptor Model

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The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with...
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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Parallel Interrogation of β-Arrestin2 Recruitment for Ligand Screening on a GPCR-Wide Scale using PRESTO-Tango Assay
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Integrating structural and mutagenesis data to elucidate GPCR ligand binding.

Christian Munk1, Kasper Harpsøe1, Alexander S Hauser1

  • 1Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Jagtvej 162, 2100 Copenhagen, Denmark.

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Summary

Integrating structural and mutagenesis data for G protein-coupled receptors (GPCRs) can reveal new ligand binding sites. This approach aids in designing drugs with specific pharmacological activities for these important membrane proteins.

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Structural Biology

Background:

  • G protein-coupled receptors (GPCRs) are the largest family of human membrane proteins and crucial drug targets.
  • Advances in GPCR structural biology offer detailed insights into ligand-binding sites and molecular interactions.
  • Growing evidence shows ligands acting on multiple receptors, allosteric sites, and biased signaling pathways.

Purpose of the Study:

  • To integrate existing structural and mutagenesis data for GPCRs.
  • To identify novel ligand-binding sites within GPCRs.
  • To facilitate the design of drugs with tailored pharmacological profiles.

Main Methods:

  • Compilation and analysis of structural data from GPCRs.
  • Integration of single point mutagenesis data from literature and databases.
  • Bioinformatic analysis of receptor-ligand interactions and allosteric modulation.

Main Results:

  • Identification of potential novel allosteric binding sites.
  • Understanding of ligand bias towards specific intracellular signaling pathways.
  • Correlation of specific mutations with altered ligand binding and signaling.

Conclusions:

  • Integrating structural and mutagenesis data is key to advancing GPCR drug discovery.
  • This integrated approach can lead to the development of more precise and effective therapeutics.
  • Future drug design strategies can leverage these combined datasets for enhanced specificity and efficacy.