Related Experiment Video
Updated: Jun 17, 2026
12:02
Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
Published on: June 6, 2017
G protein-coupled receptor kinase 2 (GRK2) modulation and cell cycle progression
Petronila Penela1, Verónica Rivas, Alicia Salcedo
1Departamento de Biología Molecular and Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, Universidad Autónoma, 28049 Madrid, Spain. ppenela@cbm.uam.es
Summary
G protein-coupled receptor kinase 2 (GRK2) is degraded during cell division via CDK2 phosphorylation, impacting cell cycle progression. Stabilized GRK2 levels disrupt cell cycle arrest and apoptosis.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Cell cycle progression relies on dynamic regulation of signaling proteins.
- G protein-coupled receptor kinase 2 (GRK2) is crucial for G protein-coupled receptor regulation.
- GRK2's role in cell cycle control remained unexplored.
Purpose of the Study:
- To investigate the role of GRK2 in cell cycle progression.
- To elucidate the mechanism regulating GRK2 levels during the cell cycle.
Main Methods:
- Utilized cell cycle analysis and protein degradation assays.
- Investigated GRK2 phosphorylation at Serine670 (S670) and its interaction with Pin1.
- Examined GRK2 levels, p53 response, and apoptosis induction under doxorubicin treatment.
Main Results:
- GRK2 protein levels are transiently downregulated during the G2/M transition.
- CDK2-mediated phosphorylation of GRK2 at S670 triggers Pin1 binding and degradation.
- Preventing GRK2 phosphorylation at S670 delays cell cycle progression.
- Doxorubicin-induced G2/M checkpoint activation prevents GRK2 downregulation.
- Stabilized GRK2 inversely correlates with p53 response and apoptosis.
Conclusions:
- GRK2 is a novel regulator of the cell cycle, degraded via phosphorylation-dependent mechanisms.
- GRK2 participates in the network controlling cell cycle arrest and survival.
- GRK2 levels are modulated by genotoxic stress, influencing cellular fate.
Related Concept Videos
02:34Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
02:34Inhibition of CDK Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
02:39Positive Regulator Molecules
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
01:45Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
02:38Mitogens and the Cell Cycle
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
02:38Mitogens and the Cell Cycle
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...