Related Experiment Video

Updated: Aug 4, 2026

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
10:13

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding

Published on: June 9, 2017

GRKs and beta-arrestins: roles in receptor silencing, trafficking and signaling

Eric Reiter1, Robert J Lefkowitz

  • 1Departments of Medicine and Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.

Trends in Endocrinology and Metabolism: TEM
|April 6, 2006
PubMed

Insights

Seven-transmembrane receptors (7TMRs) activate cellular responses. G-protein-coupled receptor kinases and beta-arrestins coordinate 7TMR desensitization and diverse cellular functions, highlighting their unique regulatory roles.

Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • Seven-transmembrane receptors (7TMRs) mediate cellular responses to extracellular signals like hormones.
  • Activation of 7TMRs classically involves recruitment of heterotrimeric GTP-binding proteins (G proteins).
  • G-protein-coupled receptor kinases (GRKs) and beta-arrestins are key regulators of 7TMR signaling.

Purpose of the Study:

  • To elucidate the coordinated roles of GRKs and beta-arrestins in 7TMR signaling.
  • To explore the expanding functions of GRKs and beta-arrestins beyond G protein regulation.
  • To highlight the unique capacity of these protein families in managing 7TMR activities.

Main Methods:

  • The study reviews existing literature on 7TMRs, G proteins, GRKs, and beta-arrestins.
  • Analysis of protein-protein interactions and signaling pathways.
  • Functional characterization of GRK and beta-arrestin involvement in 7TMR desensitization.

Main Results:

  • GRKs and beta-arrestins are central to the desensitization of G protein activation by 7TMRs.
  • These protein families engage in numerous interactions with non-receptor proteins.
  • These interactions expand the functional repertoire of GRKs and beta-arrestins.

Conclusions:

  • GRKs and beta-arrestins play a critical, coordinated role in regulating 7TMR signaling.
  • Their functions extend beyond classical G protein desensitization to encompass broader cellular processes.
  • These proteins are uniquely positioned to orchestrate diverse aspects of 7TMR cell-surface receptor function.

More Related Videos

Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery08:21

Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery

Published on: June 28, 2019

Parallel Interrogation of β-Arrestin2 Recruitment for Ligand Screening on a GPCR-Wide Scale using PRESTO-Tango Assay09:03

Parallel Interrogation of β-Arrestin2 Recruitment for Ligand Screening on a GPCR-Wide Scale using PRESTO-Tango Assay

Published on: March 10, 2020

Related Concept Videos

Enzyme-linked Receptors01:00

Enzyme-linked Receptors

Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Enzyme-linked Receptors01:00

Enzyme-linked Receptors

Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR activation may...
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
GPCR Desensitization01:12

GPCR 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...