Related Experiment Video
Updated: May 15, 2026
10:13
Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
Published on: June 9, 2017
G protein-coupled receptors--recent advances
Dorota Latek1, Anna Modzelewska, Bartosz Trzaskowski
1Biomodeling Laboratory, International Institute of Molecular and Cell Biology, Warsaw, Poland.
Acta Biochimica Polonica
|December 20, 2012
Summary
G protein-coupled receptors (GPCRs) are crucial drug targets. Recent structural biology advances reveal their complex signaling mechanisms beyond simple on-off switches, impacting drug discovery.
Area of Science:
- Structural biology
- Molecular pharmacology
- Biochemistry
Background:
- G protein-coupled receptors (GPCRs) are vital membrane proteins involved in numerous physiological processes.
- GPCRs are key targets for a significant portion of current pharmaceuticals.
- Understanding GPCR structure and function is critical for drug discovery and development.
Purpose of the Study:
- To highlight key advancements in GPCR structural biology.
- To explain the complex mechanisms of GPCR activation and signal transduction.
- To underscore the implications of GPCR complexity for drug discovery.
Main Methods:
- Crystallization and structure determination of GPCRs like bovine rhodopsin and β(2)-adrenergic receptor.
- Advances in microcrystallization techniques.
- Biochemical characterization of GPCR signaling pathways.
Main Results:
- Milestone structures of rhodopsin (2000) and β(2)-adrenergic receptor (2007) were solved.
- GPCRs exhibit complex activation states and signaling via G proteins and arrestins.
- Ligand binding induces conformational changes, leading to diverse cellular responses.
Conclusions:
- GPCRs function as sophisticated 'microprocessors' rather than simple on-off switches.
- The complexity of GPCR signaling offers new avenues for targeted drug development.
- Further research into GPCR structural dynamics and signaling pathways is essential.
Related Concept Videos
01:15G Protein-coupled Receptors
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...
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...
01:15G Protein-coupled Receptors
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...
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...
01:21G-protein Coupled Receptors
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.
01:21G-protein Coupled Receptors
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.
01:30Transducer Mechanism: G Protein–Coupled Receptors
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.
GPCRs are also called heptahelical, 7TM, or...
GPCRs are also called heptahelical, 7TM, or...
01:12GPCR Desensitization
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...