GO:0008603 cAMP-dependent protein kinase regulator activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0008603 describes the molecular function of modulating the activity of cAMP-dependent protein kinase (PKA), a central serine/threonine kinase in eukaryotic signal transduction.
• Regulation occurs through multiple mechanisms, including glutathionylation of PKA subunits, which can directly inhibit kinase activity.
• Non-coding RNAs, such as miR-34c-3p, can regulate PKA activity by targeting the prkar2b transcript, independent of cAMP levels.
• PKA activity influences diverse cellular processes, including cell cycle progression, cytoskeleton rearrangement, ion channel modulation, and gene expression [2,3,5,6].
• Feedback loops, such as that involving Raf Kinase Inhibitory Protein (RKIP), fine-tune PKA signaling output.
• Studying GO:0008603 requires integrating genetic, biochemical, and imaging approaches to dissect regulator function in health and disease [1,2,4,7].
Description
cAMP-dependent protein kinase (PKA) is one of the most extensively studied kinases in eukaryotic biology, transducing signals from cyclic AMP to a myriad of downstream effectors. The activity of PKA is not constitutive; it is tightly controlled by a variety of regulator proteins and post-translational modifications that collectively define the Gene Ontology molecular function GO:0008603, cAMP-dependent protein kinase regulator activity [1,4]. This term captures any gene product that modulates PKA enzymatic activity, ensuring appropriate cellular responses to hormonal, neurotransmitter, and metabolic cues. Understanding GO:0008603 is therefore fundamental for researchers investigating signal transduction, because dysregulation of PKA regulators can lead to diseases ranging from cancer to neurological disorders [3,6]. Moreover, the emergence of non-canonical regulators, such as microRNAs that directly target PKA subunit transcripts, highlights the expanding complexity of this regulatory function. This article synthesizes authoritative QuickGO annotations and verified PubMed literature to provide a research-grade overview of GO:0008603, its mechanisms, associated genes, and experimental strategies for its study.
cAMP-dependent protein kinase regulator activity At A Glance
| GO ID | GO:0008603 |
|---|---|
| GO term | cAMP-dependent protein kinase regulator activity |
| Ontology | molecular_function |
| Synonym | 3',5' cAMP-dependent protein kinase regulator activity; 3',5'-cAMP-dependent protein kinase regulator activity; adenosine 3',5'-cyclophosphate-dependent protein kinase regulator activity; cAMP-dependent protein kinase, intrinsic regulator activity; cyclic AMP-dependent protein kinase regulator activity |
| Major function | Modulation of the activity of cAMP-dependent protein kinase (PKA) |
| Related kinase | cAMP-dependent protein kinase (PKA) |
| Regulatory mechanisms | Glutathionylation, microRNA-mediated transcript cleavage, protein-protein feedback loops |
| Associated processes | Cell cycle progression, cytoskeleton rearrangement, ion channel modulation, gene expression |
What Is GO:0008603?
GO:0008603, cAMP-dependent protein kinase regulator activity, is defined as the modulation of the activity of the enzyme cAMP-dependent protein kinase (PKA). This molecular function encompasses any protein or molecule that alters PKA catalytic efficiency, substrate specificity, or localization, thereby influencing downstream signaling. Regulators can act by direct binding, post-translational modification, or altering the availability of PKA subunits [1,4,7].
Why Is cAMP-dependent protein kinase regulator activity Important in Cell Biology?
GO:0008603 is critical because PKA sits at the hub of numerous signaling pathways, and its precise regulation determines whether cells proliferate, differentiate, or respond to stress. Disruption of PKA regulators has been linked to cancer, cardiovascular disease, and neurological disorders, making this function a prime target for therapeutic intervention and basic research [3,6].
• PKA regulator activity controls cell cycle progression in thyroid cells, linking GO:0008603 to proliferative diseases.
• Regulation of PKA by glutathionylation provides a redox-sensitive mechanism that can alter kinase output under oxidative stress.
• MicroRNA-mediated regulation of PKA subunit transcripts, such as miR-34c-3p targeting prkar2b, reveals a non-cAMP-dependent layer of control.
• PKA regulator activity modulates T-type calcium channels, affecting neuronal excitability and pain signaling.
• Somatostatin gene expression in neurons depends on PKA and Ca2+-calmodulin kinase pathways, highlighting roles in neuroendocrine function.
• RKIP participates in a positive feedback loop that fine-tunes PKA signaling, impacting cell survival and metastasis.
• Cytoskeletal rearrangement in endothelial cells requires PKA activity, influencing vascular permeability and angiogenesis.
• Dysregulation of PKA regulators is implicated in tumorigenesis, making them potential biomarkers or drug targets [3,7].
• Understanding GO:0008603 aids in interpreting how hormones and neurotransmitters translate into cellular responses.
• Experimental models targeting PKA regulators can uncover new therapeutic strategies for diseases with aberrant cAMP signaling [1,4].
What Happens During cAMP-dependent protein kinase regulator activity?
Initiation by cAMP and Regulator Recruitment
In simple terms: When cAMP levels rise, PKA changes shape and regulator proteins can bind to it.
In the classical pathway, cAMP binds to the regulatory subunits of PKA, causing dissociation of catalytic subunits and enabling regulator proteins to interact with either subunit. This step is the first point at which GO:0008603 activity can be exerted, as regulators may stabilize or destabilize the holoenzyme complex.
Post-translational Modification of PKA Subunits
In simple terms: Chemical tags can be added to PKA to turn its activity up or down.
Glutathionylation of PKA subunits is a reversible modification that inhibits kinase activity, representing a direct regulatory mechanism under oxidative conditions. This modification exemplifies how GO:0008603 can be executed through covalent changes rather than protein-protein interactions.
Non-coding RNA-Mediated Regulation
In simple terms: Small RNAs can cut the instructions for making PKA parts, reducing PKA activity.
miR-34c-3p regulates PKA activity independent of cAMP by promoting cleavage of prkar2b transcripts in Theileria annulata-infected leukocytes. This finding expands the scope of GO:0008603 to include post-transcriptional regulators that indirectly modulate PKA levels.
Feedback and Feed-forward Loops
In simple terms: Proteins can create loops that keep PKA signaling in check or amplify it.
Raf Kinase Inhibitory Protein (RKIP) participates in a positive feedback loop that regulates the cAMP-dependent protein kinase signaling pathway, ensuring balanced signal output. Such loops are integral to GO:0008603 because they dynamically adjust PKA activity in response to upstream cues.
Downstream Effector Modulation
In simple terms: Once PKA activity is set, it changes the behavior of many target proteins.
Regulated PKA activity modulates T-type calcium channels, somatostatin gene expression, and endothelial cytoskeleton rearrangement, demonstrating the broad physiological impact of GO:0008603 [2,5,6]. These downstream events are the ultimate readouts of successful PKA regulation.
Key Genes Involved in GO:0008603 cAMP-dependent protein kinase regulator activity
The following genes and proteins are experimentally validated participants in or regulators of cAMP-dependent protein kinase regulator activity (GO:0008603).
| Gene | Major Role | Research Relevance |
|---|---|---|
| PRKACA | Catalytic subunit of PKA; target of regulation | Mutations linked to adrenal and thyroid tumors |
| PRKAR1A | Regulatory subunit of PKA; binds cAMP | Mutations cause Carney complex; regulator of PKA activity |
| PRKAR2B | Regulatory subunit of PKA; targeted by miR-34c-3p | Regulated by non-coding RNA in infected leukocytes |
| RKIP (PEBP1) | Inhibits Raf kinase; participates in PKA feedback loop | Modulates PKA signaling in cancer |
| GSH | Glutathionylation donor for PKA subunits | Redox regulation of PKA activity |
| miR-34c-3p | MicroRNA targeting PRKAR2B transcript | Non-cAMP-dependent PKA regulation |
| Cav3.2 (CACNA1H) | T-type calcium channel modulated by PKA | PKA regulation of ion channels |
| SST | Somatostatin gene; expression regulated by PKA | Neuroendocrine gene regulation |
| ACTB | Actin; cytoskeleton rearrangement requires PKA | Endothelial cell permeability |
| TUBB | Tubulin; cytoskeleton dynamics affected by PKA | Cell shape and migration |
| CREB1 | Transcription factor phosphorylated by PKA | Gene expression downstream of PKA |
| MAPK1 | ERK2; cross-talk with PKA signaling | Integration of kinase pathways |
| RAF1 | Raf-1 kinase; inhibited by RKIP, linked to PKA | Feedback regulation |
| PRKACG | Gamma catalytic subunit of PKA | Testis-specific PKA functions |
| PRKACB | Beta catalytic subunit of PKA | Diverse PKA functions |
| PDE4D | Phosphodiesterase; degrades cAMP | Indirect regulator of PKA activity |
| PPP1R1B | DARPP-32; inhibitor of protein phosphatase 1, modulated by PKA | Neuronal signaling |
How Is cAMP-dependent protein kinase regulator activity Regulated?
GO:0008603 is itself regulated at multiple levels. Glutathionylation of PKA subunits directly inhibits kinase activity, providing a redox-sensitive switch. MicroRNAs such as miR-34c-3p can downregulate PKA subunit expression by targeting transcripts, independently of cAMP. Feedback loops involving RKIP modulate PKA signaling output, ensuring homeostasis. Additionally, the availability of cAMP through phosphodiesterases and adenylyl cyclases indirectly controls PKA regulator activity.
cAMP-dependent protein kinase regulator activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PRKACA | Thyroid and adrenal tumors | Knockout or point mutation in thyroid cell lines |
| PRKAR1A | Carney complex | Knock-in of patient mutations in iPSCs |
| RKIP (PEBP1) | Cancer metastasis | Overexpression or knockout in cancer cell lines |
| PRKAR2B | Theileria annulata-infected leukocytes | miR-34c-3p mimic/inhibitor in leukocyte cultures |
| CACNA1H | Pain and epilepsy | Point mutation in neuronal cells |
Cancer and Cell Cycle Dysregulation
Altered PKA regulator activity affects cell cycle progression in thyroid cells, and mutations in PKA subunits are associated with endocrine tumors. RKIP, a regulator of PKA signaling, is implicated in cancer metastasis, suggesting that GO:0008603 dysfunction contributes to tumorigenesis.
Neurological and Neuroendocrine Disorders
PKA regulator activity modulates T-type calcium channels and somatostatin gene expression, processes critical for neuronal excitability and neuroendocrine function [5,6]. Dysregulation may underlie conditions such as epilepsy or hormonal imbalances.
Infectious and Inflammatory Diseases
In Theileria annulata-infected leukocytes, miR-34c-3p regulates PKA activity independent of cAMP, highlighting a pathogen-driven mechanism that could contribute to leukemia-like transformation.
Cardiovascular and Endothelial Dysfunction
PKA activity is required for endothelial cell cytoskeleton rearrangement, which affects vascular permeability and angiogenesis. Abnormal regulation may lead to edema or impaired wound healing.
From cAMP-dependent protein kinase regulator activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of PRKAR1A alter PKA activity? | Knockout cell line (e.g., HEK293) |
| How does a specific PRKACA mutation affect kinase function? | Point mutation knock-in via CRISPR |
| Can a tagged PKA subunit reveal dynamic localization? | Knock-in of fluorescent tag (e.g., GFP) |
| What is the effect of PRKAR2B overexpression? | Overexpression stable cell line |
| Does miR-34c-3p regulate PKA in infected cells? | miRNA mimic/inhibitor transfection |
| How does RKIP feedback affect PKA signaling? | Knockout and rescue experiments |
How to Study the cAMP-dependent protein kinase regulator activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| In vitro kinase assay | PKA catalytic activity | Testing regulator effects |
| Western blot | Protein expression and phosphorylation | Validating knockout or overexpression |
| qRT-PCR | mRNA levels of PKA subunits | Assessing miRNA-mediated regulation |
| FRET biosensor imaging | Real-time PKA activity | Live-cell dynamics |
| CRISPR knockout | Loss-of-function phenotypes | Gene function studies |
| CRISPR knock-in | Mutant protein expression | Disease modeling |
| Co-immunoprecipitation | Protein-protein interactions | Identifying regulator complexes |
| Phosphoproteomics | Global phosphorylation changes | Mapping PKA substrates |
Biochemical Kinase Assays
In vitro kinase assays using purified PKA and substrate peptides can measure the impact of regulators such as glutathionylation or RKIP on catalytic activity [1,7].
Genetic Knockout and Knock-in Models
CRISPR-Cas9 mediated knockout of PRKAR1A or PRKACA, or knock-in of point mutations, allows dissection of regulator function in cell lines and animal models [3,8].
RNA Interference and miRNA Modulation
Transfection of miR-34c-3p mimics or inhibitors can reveal non-cAMP-dependent regulation of PKA subunit transcripts.
Live-cell Imaging of PKA Dynamics
FRET-based reporters or fluorescently tagged PKA subunits enable real-time visualization of PKA activity and localization in response to regulators [1,2].
How CRISPR Can Be Used to Study GO:0008603 cAMP-dependent protein kinase regulator activity
Knockout
CRISPR knockout of PKA regulatory subunits such as PRKAR1A or PRKAR2B can abolish or enhance PKA activity, revealing their roles in cell cycle and signaling [3,8].
Point Mutation
Introducing disease-associated point mutations in PRKACA or PRKAR1A via CRISPR base editing or HDR allows functional analysis of altered regulator activity.
Knock-in
Knock-in of fluorescent tags or epitope tags into endogenous PKA subunit loci enables tracking of protein localization and interactions without overexpression artifacts.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of regulators like RKIP can test gain-of-function effects on PKA signaling and downstream phenotypes.
How EDITGENE Supports cAMP-dependent protein kinase regulator activity Research
Researchers studying cAMP-dependent protein kinase regulator activity-related genes often need to determine whether a candidate gene is causally involved in PKA regulation, and CRISPR-based models provide the most direct approach. EDITGENE offers a comprehensive suite of services to generate precisely engineered cell lines for such investigations.
Contact EDITGENE today to design your custom CRISPR model for cAMP-dependent protein kinase regulator activity research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| PRKAG1 Knockout HEK293 Cell Line | EDJ-KQ1449 | Human | 5571 | Details Get a Quote |
| PRKAG2 Knockout HEK293 Cell Line | EDJ-KQ1451 | Human | 51422 | Details Get a Quote |
| CXCL10 Knockout HEK293 Cell Line | EDJ-KQ1480 | Human | 3627 | Details Get a Quote |
| PRKAR1B Knockout HEK293 Cell Line | EDJ-KQ3331 | Human | 5575 | Details Get a Quote |
| PRKAR2A Knockout HEK293 Cell Line | EDJ-KQ3483 | Human | 5576 | Details Get a Quote |
| PRKAR2B Knockout HEK293 Cell Line | EDJ-KQ5536 | Human | 5577 | Details Get a Quote |
| PRKAG1 Knockout A-549 Cell Line | EDJ-KQ21001 | Human | 5571 | Details Get a Quote |
| PRKAG1 Knockout HCT 116 Cell Line | EDJ-KQ21002 | Human | 5571 | Details Get a Quote |
| PRKAG1 Knockout HeLa Cell Line | EDJ-KQ21003 | Human | 5571 | Details Get a Quote |
| PRKAG2 Knockout A-549 Cell Line | EDJ-KQ21004 | Human | 51422 | Details Get a Quote |
| PRKAG2 Knockout HCT 116 Cell Line | EDJ-KQ21005 | Human | 51422 | Details Get a Quote |
| PRKAG2 Knockout HeLa Cell Line | EDJ-KQ21006 | Human | 51422 | Details Get a Quote |
| PRKAR1B Knockout A-549 Cell Line | EDJ-KQ24955 | Human | 5575 | Details Get a Quote |
| PRKAR1B Knockout HCT 116 Cell Line | EDJ-KQ24956 | Human | 5575 | Details Get a Quote |
| PRKAR1B Knockout HeLa Cell Line | EDJ-KQ24957 | Human | 5575 | Details Get a Quote |
Displaying Records 1 To 15 Of 25 Records
Frequently Asked Questions About cAMP-dependent protein kinase regulator activity
What is cAMP-dependent protein kinase regulator activity?
It is a molecular function (GO:0008603) that describes the modulation of the activity of the enzyme cAMP-dependent protein kinase (PKA).
What genes are involved in cAMP-dependent protein kinase regulator activity?
Key genes include PRKACA, PRKAR1A, PRKAR2B, RKIP (PEBP1), and non-coding RNAs such as miR-34c-3p [1,3,4,7].
How is PKA activity regulated by glutathionylation?
Glutathionylation of PKA subunits can inhibit kinase activity, providing a redox-sensitive regulatory mechanism.
Can microRNAs regulate PKA activity?
Yes, miR-34c-3p regulates PKA activity independent of cAMP by targeting prkar2b transcripts.
What diseases are associated with PKA regulator dysfunction?
Dysregulation is linked to cancer, Carney complex, neurological disorders, and infectious diseases [3,4,6].
What experimental models are used to study GO:0008603?
Common models include CRISPR knockout/knock-in cell lines, overexpression systems, and biochemical kinase assays [1,3,7].
How does RKIP regulate PKA signaling?
RKIP participates in a positive feedback loop that modulates the cAMP-dependent protein kinase signaling pathway.
What is the role of PKA in cell cycle progression?
PKA activity affects cell cycle progression in thyroid cells, and its regulators can influence proliferation.
How does PKA regulate ion channels?
PKA can augment T-type calcium channel activity, impacting neuronal excitability.
What methods measure PKA regulator activity?
In vitro kinase assays, FRET biosensors, and phosphoproteomics are commonly used [1,2,6].
Conclusion
GO:0008603, cAMP-dependent protein kinase regulator activity, represents a vital layer of control in cellular signaling, integrating post-translational modifications, non-coding RNAs, and feedback loops to fine-tune PKA output [1,4,7]. Its relevance spans cancer, neurobiology, and infectious disease, making it a compelling target for both basic and translational research [3,6]. By leveraging CRISPR-based models and advanced biochemical assays, researchers can dissect the precise contributions of individual regulators to PKA function and identify new therapeutic opportunities.
References
- 1. Humphries KM et al.. 2002. Regulation of cAMP-dependent protein kinase activity by glutathionylation.. J Biol Chem 277(45):43505-11 PMID: 12189155
- 2. Liu F et al.. 2001. Role of cAMP-dependent protein kinase A activity in endothelial cell cytoskeleton rearrangement.. Am J Physiol Lung Cell Mol Physiol 280(6):L1309-17 PMID: 11350812
- 3. Feliciello A et al.. 2000. The localization and activity of cAMP-dependent protein kinase affect cell cycle progression in thyroid cells.. J Biol Chem 275(1):303-11 PMID: 10617619
- 4. Haidar M et al.. 2023. miR-34c-3p Regulates Protein Kinase A Activity Independent of cAMP by Dicing prkar2b Transcripts in Theileria annulata-Infected Leukocytes.. mSphere 8(2):e0052622 PMID: 36847534
- 5. Kim JA et al.. 2006. Augmentation of Cav3.2 T-type calcium channel activity by cAMP-dependent protein kinase A.. J Pharmacol Exp Ther 318(1):230-7 PMID: 16569752
- 6. Sánchez-Muñoz I et al.. 2010. Activity-dependent somatostatin gene expression is regulated by cAMP-dependent protein kinase and Ca2+-calmodulin kinase pathways.. J Neurosci Res 88(4):825-36 PMID: 19859966
- 7. Lee J et al.. 2022. Raf Kinase Inhibitory Protein regulates the cAMP-dependent protein kinase signaling pathway through a positive feedback loop.. Proc Natl Acad Sci U S A 119(25):e2121867119 PMID: 35696587
- 8. Meinkoth JL et al.. 1993. Signal transduction through the cAMP-dependent protein kinase.. Mol Cell Biochem 127-128:179-86 PMID: 7935349
