Gpcr Pdz Domains
Gpcr Pdz Domains - Related Videos
10:05
In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
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Cited by 7 •
2012
Cystic fibrosis transmembrane conductance regulator (CFTR), an epithelial chloride channel, has been reported to interact with various proteins and regulate important cellular processes; among them the CFTR PDZ motif-mediated interactions have been well documented. This protocol describes methods we developed to assemble a PDZ-dependent CFTR macromolecular signaling complex in vitro.
01:12
GPCR Desensitization
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2023
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...
02:26
Conservation of Protein Domains Over Different Proteins
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2020
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms. A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
09:12
G Protein-selective GPCR Conformations Measured Using FRET Sensors in a Live Cell Suspension Fluorometer Assay
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Cited by 4 •
2016
Simple methods to detect the selective activation of G proteins by G protein-coupled receptors remain an outstanding challenge in cell signaling. Here, Fӧrster resonance energy transfer (FRET) biosensors have been developed by pairwise tethering a GPCR to G protein peptides to probe conformational changes at controlled concentrations in live cells.
01:21
Three-Domain System of Life
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2025
Ribosomal RNA (rRNA) sequence analysis revealed three distinct groups of cells: eukaryotes, bacteria, and archaea. In 1978, Carl R. Woese proposed the concept of domains, a taxonomic level above kingdoms, to differentiate these groups. He suggested that archaea and bacteria, despite their similar appearance, represent separate domains. Domains differ in rRNA, membrane lipid structure, transfer RNA, and antibiotic sensitivity.In this classification, animals, plants, and fungi belong to the...
FAQs
Recognition depends on the receptor’s carboxyl-terminal sequence and the complementary binding groove of the PDZ domain. Because the terminal residues contribute to binding, changes near this motif can modify the interaction without altering the receptor’s entire structure. This sequence-level selectivity helps determine which scaffold proteins associate with a particular GPCR.
Phosphorylation or other chemical changes near the terminal motif can alter how effectively the receptor engages the PDZ binding groove. That change may reorganize the receptor’s association with scaffold proteins, signaling components, or endocytic machinery. Consequently, modification of a small sequence region can influence receptor localization, internalization, recycling, or downstream functional coupling.
Scaffold proteins provide an organizational connection between the receptor and other cellular machinery. Through PDZ-mediated interactions, they can position signaling components or endocytic factors near the GPCR, influencing where receptor activity occurs and how the receptor is handled after signaling. This organization helps explain why receptor regulation depends on molecular context, not only receptor activation.
Analysis of these complexes can reveal whether a receptor is preferentially localized, internalized, or recycled, and how it remains functionally coupled to downstream pathways. The interactions also identify regulatory points at the receptor’s carboxyl terminus. Together, these outcomes help connect molecular binding events with changes in receptor distribution and signaling behavior.
These interactions are relevant to synaptic communication and sensory biology, where receptor position and signaling connections can shape cellular responses. They also provide context for investigating drug responses, because altered receptor trafficking or pathway coupling may change how cells respond. The same framework supports examination of diseases involving disrupted GPCR regulation.
A disrupted interaction can be examined as a possible explanation for abnormal receptor localization, internalization, recycling, or downstream coupling. In drug-response studies, this framework helps relate receptor-associated scaffolding to changes in cellular signaling. In disease research, identifying which regulatory connection is affected can clarify how GPCR control becomes functionally impaired.