Gpcr Ligands
Gpcr Ligands - Related Videos
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...
09:03
Parallel Interrogation of β-Arrestin2 Recruitment for Ligand Screening on a GPCR-Wide Scale using PRESTO-Tango Assay
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Cited by 12 •
2020
Given that GPCRs are attractive druggable targets, GPCR ligand screening is thus indispensable for the identification of lead compounds and for deorphanization studies. Towards these efforts, we describe PRESTO-Tango, an open-source resource platform used for simultaneous profiling of transient β-arrestin2 recruitment at approximately 300 GPCRs using a TEV-based reporter assay.
02:40
Ligand Binding Sites
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2020
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...
02:51
Metal-Ligand Bonds
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2020
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes. In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
00:49
Ligand Binding and Linkage
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2020
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 the...
FAQs
Binding can stabilize particular receptor conformations rather than simply switching the receptor into one fixed state. These conformations influence whether the receptor couples more strongly to heterotrimeric G proteins or to β-arrestins. Consequently, ligand engagement can redirect downstream signaling, including changes in cyclic AMP or intracellular calcium, and can produce different biological outcomes.
Receptor conformation provides a molecular link between ligand occupancy and pathway selection. A ligand that favors one conformation may alter coupling to G proteins, whereas another may favor β-arrestin-associated signaling. This principle helps explain why ligands acting at the same receptor can be valuable for separating signaling mechanisms during biological investigation.
The overview identifies cyclic AMP and intracellular calcium as important downstream signaling outputs. Changes in these pathways provide measurable consequences of receptor engagement and coupling. Examining them connects molecular ligand-receptor interactions with broader functions regulated by GPCRs, including sensation, metabolism, and immune activity.
Endogenous ligands, such as hormones and neurotransmitters, allow cells and tissues to coordinate physiological processes through GPCR signaling. Their activities contribute to functions that include sensation, metabolism, and immune function. This places ligand-receptor interactions within normal biological communication rather than limiting them to laboratory or therapeutic settings.
Synthetic agonists, antagonists, and modulators serve as experimental tools for dissecting how GPCRs signal. By applying different ligand classes, researchers can investigate receptor-linked responses and examine pathway behavior involving G proteins, β-arrestins, cyclic AMP, or intracellular calcium. These compounds therefore support mechanistic studies even when the relevant endogenous ligand is not the experimental focus.
Their importance follows from the wide biological roles controlled by GPCR signaling and from the ability of synthetic compounds to alter that signaling. Ligands provide a route for investigating disorders associated with sensation, metabolism, or immune function, while also supporting medicine development aimed at influencing receptor-regulated pathways.