| 1990 |
PRKAR2B (RIIβ), as a type II regulatory subunit of cAMP-dependent protein kinase A (PKA), contains an autoinhibitory region that occupies the peptide-binding site of the catalytic subunit, thereby preventing substrate access; cAMP binding to the regulatory subunit relieves this inhibition and activates catalytic subunits. |
Biochemical reconstitution, recombinant protein expression, peptide binding assays, and protein chemistry |
Annual review of biochemistry |
High |
2165385
|
| 1997 |
D-AKAP2, a dual-specificity A-kinase anchoring protein, physically interacts with both type I (RIα) and type II (RIIα, RIIβ/PRKAR2B) regulatory subunits of PKA via a C-terminal R-binding domain (residues 333–372), and this binding involves the N-terminal dimerization domain of the regulatory subunits; D-AKAP2 also contains a putative RGS domain, suggesting a link between G-protein signaling and PKA compartmentalization. |
Yeast two-hybrid screen, coprecipitation assays, cDNA cloning |
Proceedings of the National Academy of Sciences of the United States of America |
High |
9326583
|
| 2000 |
PKA (whose activity is regulated by regulatory subunits including PRKAR2B) is assembled into a macromolecular complex at the ryanodine receptor RyR2 on the sarcoplasmic reticulum via the anchoring protein mAKAP; PKA phosphorylation of RyR2 dissociates FKBP12.6 and increases channel open probability, and in failing human hearts RyR2 is PKA-hyperphosphorylated, causing defective channel regulation. |
Cosedimentation, coimmunoprecipitation, functional channel recordings |
Cell |
High |
10830164
|
| 2002 |
Beta-adrenergic receptor modulation of the IKs potassium channel (KCNQ1-KCNE1) requires assembly of a macromolecular signaling complex including PKA (regulatory subunits) and protein phosphatase 1 (PP1) anchored to hKCNQ1 via the scaffold protein yotiao through a leucine zipper motif; an LQTS mutation (hKCNQ1-G589D) disrupts this interaction. |
Coimmunoprecipitation, functional reconstitution in heterologous cells, mutagenesis |
Science (New York, N.Y.) |
High |
11799244
|
| 2014 |
In adrenocortical carcinoma cells (H295R), siRNA-mediated depletion of PRKAR2B activates both PKA and MEK/ERK signaling pathways and NF-κB pathway (via reduced IκB expression), promotes cell cycle progression with accumulation of cyclins A, B, cdk1, cdc2, and p21Cip, and induces anti-apoptotic Bcl-xL expression; notably, PRKAR2B depletion is compensated by upregulation of PRKAR1A protein, whereas PRKAR1A depletion does not affect PRKAR2B levels. |
siRNA knockdown, Western blotting, flow cytometry (cell cycle), apoptosis assays, signaling pathway analysis |
Hormone and metabolic research |
Medium |
25268545
|
| 2017 |
PRKAR2B promotes castration-resistant prostate cancer (CRPC) cell proliferation and invasion and inhibits apoptosis; whole-genome transcriptome and GO analysis of PRKAR2B knockdown revealed that PRKAR2B accelerates cell cycle progression by modulating cell cycle genes including CCNB1, MCM2, PLK1, and AURKB. |
siRNA knockdown, whole-genome transcriptome analysis, GO enrichment, functional proliferation/invasion/apoptosis assays |
Oncotarget |
Medium |
28008150
|
| 2018 |
PRKAR2B promotes prostate cancer cell invasion and tumor metastasis in vivo by activating Wnt/β-catenin signaling, which in turn induces epithelial-mesenchymal transition (EMT) as evidenced by decreased E-cadherin and increased Vimentin, N-cadherin, and Fibronectin; pharmacological inhibition of Wnt/β-catenin attenuates PRKAR2B-induced EMT and invasion. |
Gain- and loss-of-function (overexpression and siRNA), in vitro invasion assays, in vivo metastasis model, Western blotting, Wnt pathway inhibitor rescue |
Journal of cellular biochemistry |
Medium |
29761841
|
| 2018 |
In neural cells, FOXG1 regulates PRKAR2B expression both transcriptionally and posttranscriptionally: FOXG1 affects biogenesis of miR-200b/a/429 by interacting with the RNA helicase DDX5/p68 and recruiting it to the DROSHA microprocessor complex; elevated miR-200 represses PRKAR2B mRNA, and increased PRKAR2B protein attenuates PKA activity at postsynaptic sites, potentially contributing to neuronal dysfunction in FOXG1 syndrome. |
Genome-wide small RNA sequencing, quantitative proteomics, RNA-Seq, coimmunoprecipitation (FOXG1-DDX5-DROSHA), miR-200 overexpression in N2a cells |
Molecular neurobiology |
Medium |
30539330
|
| 2018 |
In mouse oocytes, PRKAR2B is most highly expressed at metaphase I (MI) and is required for normal oocyte maturation; RNAi-mediated knockdown of Prkar2b causes MI-stage arrest with abnormal spindle formation and chromosome aggregation, and reduces expression of other PKA family members (except Prkaca) and the majority of pentose phosphate pathway (PPP) factors. |
RNAi microinjection, immunofluorescence, time-lapse video microscopy, qRT-PCR, immunohistochemistry |
Cellular physiology and biochemistry |
Medium |
29518769
|
| 2020 |
PRKAR2B promotes aerobic glycolysis (Warburg effect) in prostate cancer cells by increasing HIF-1α protein levels; HIF-1α in turn transcriptionally induces PRKAR2B expression (as shown by luciferase reporter and chromatin immunoprecipitation), forming a positive feedback loop; PRKAR2B-mediated tumor growth is largely abolished by glycolytic inhibitor 2-DG, galactose replacement, or HIF-1α knockdown. |
Loss- and gain-of-function, Western blotting, real-time qPCR, luciferase reporter assay, chromatin immunoprecipitation, glucose consumption/lactate/ECAR measurements, in vivo tumor growth |
Cell proliferation |
Medium |
33025691
|
| 2020 |
miR-200b-3p and miR-200c-3p directly repress PRKAR2B expression in prostate cancer cells and are downregulated in metastatic CRPC; the transcription factor XBP1 directly drives PRKAR2B transcription; rescue experiments show that PRKAR2B mediates the proliferative and anti-apoptotic effects of miR-200b-3p/200c-3p suppression and XBP1 activity. |
miRNA target validation, luciferase reporter, qPCR, Western blotting, siRNA knockdown rescue assays, ChIP |
Biomedicine & pharmacotherapy |
Medium |
31986411
|
| 2020 |
SARS-CoV-2 proteins physically associate with PRKAR2B as part of the human protein interaction network; PRKAR2B was identified as a host protein that physically interacts with SARS-CoV-2 proteins by affinity-purification mass spectrometry in human cells. |
Affinity purification mass spectrometry (AP-MS) in HEK293 cells expressing tagged SARS-CoV-2 proteins |
Nature |
Low |
32353859
|
| 2021 |
BioPlex 3.0 large-scale AP-MS interaction network identifies protein-protein interactions involving PRKAR2B in HEK293T and HCT116 cells, placing PRKAR2B within defined protein communities consistent with PKA signaling complexes. |
Affinity purification mass spectrometry (AP-MS) across 10,128 human proteins |
Cell |
Low |
33961781
|
| 2022 |
In Theileria annulata-infected bovine leukocytes and Plasmodium falciparum-infected red blood cells, infection-induced upregulation of miR-34c-3p represses PRKAR2B expression at the mRNA level, leading to increased PKA catalytic activity independent of cAMP flux; this cAMP-independent PKA activation enhances the tumorigenic, disseminating phenotype of infected macrophages and improves parasite fitness. |
miRNA target validation (luciferase reporter, qRT-PCR), miR-34c-3p overexpression and inhibition, PKA activity assays, functional invasion/dissemination assays |
mSphere |
Medium |
36847534
|
| 2023 |
MAPKAPK2 (MK2) regulates PRKAR2B mRNA stability in head and neck squamous cell carcinoma (HNSCC); MK2 knockdown reduces PRKAR2B transcript levels, and transcript turnover studies indicate MK2 controls PRKAR2B mRNA stability via its 3'-UTR. |
NGS transcriptome profiling, MK2 knockdown, 3'-UTR filtering, nCounter gene expression assay, immunohistochemistry, transcript stability assays |
Computational and structural biotechnology journal |
Medium |
36817960
|
| 2025 |
In porcine adipocytes, the circular RNA circSAMD4A promotes adipogenic differentiation by competitively binding miR-127, thereby alleviating miR-127-mediated repression of PRKAR2B and enhancing PRKAR2B expression and lipid accumulation. |
RNA sequencing, circRNA/miRNA functional assays, luciferase reporter, lipid accumulation assays |
Animal science journal |
Low |
40589305
|
| 2025 |
In diabetic kidney disease (DKD), miR-3147 (upregulated in glomerular mesangial cells under high glucose) targets PRKAR2B mRNA and represses its expression, promoting mesangial cell proliferation and early-stage apoptosis under high glucose conditions. |
miRNA-Seq, luciferase reporter validation, miR-3147 overexpression in mesangial cells, cell viability and apoptosis assays |
Renal failure |
Low |
40571682
|
| 2026 |
In pancreatic ductal adenocarcinoma (PDAC), the transcription factor HHEX transcriptionally represses PRKAR2B expression; downregulation of HHEX reduces PRKAR2B, relieving inhibition on PKA catalytic activity; a high-glucose microenvironment further promotes cAMP production to activate PKA, which then upregulates hexokinase 2 (HK2) to enhance glycolysis and metastasis; glycolysis inhibition blocks metastasis driven by this axis. |
Loss- and gain-of-function (HHEX, PRKAR2B), ChIP/transcription factor binding assays, PKA activity assays, HK2 expression analysis, in vivo high-glucose/glycolysis inhibition experiments |
iScience |
Medium |
41704777
|