PKA RIIβ Protein (Protein Kinase A Regulatory Subunit 2B)

PKA RIIβ Protein (Protein Kinase A Regulatory Subunit 2B)

Introduction

Pka Riiβ Protein (Protein Kinase A Regulatory Subunit 2B) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-protein"> [@kim2019]
<div class="infobox-header">PKA RIIβ Protein</div> [@liu2018]
<div class="infobox-content"> [@beraldo2019]
<table> [@zhao2017]
<tr><th>Protein Name</th><td>PKA RIIβ (Protein Kinase cAMP-Dependent Regulatory Subunit Type II Beta)</td></tr>
<tr><th>Gene</th><td>[PRKAR2B](/genes/prkar2b)</td></tr>
<tr><th>UniProt ID</th><td>[P31321](https://www.uniprot.org/uniprot/P31321)</td></tr>
<tr><th>PDB ID</th><td>1R2A, 2Q0J, 4DG0</td></tr>
<tr><th>Molecular Weight</th><td>45.5 kDa</td></tr>
<tr><th>Subcellular Localization</th><td>Cytoplasm, Synapse, Nucleus</td></tr>
<tr><th>Protein Family</th><td>cAMP-Dependent Protein Kinase Regulatory Subunit Family</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>
</div>

Overview

PKA RIIβ is the neuron-specific regulatory subunit of protein kinase A (PKA). The RIIβ-containing PKA is particularly important in the brain, where it regulates synaptic plasticity, memory formation, and [tau](/proteins/tau) phosphorylation.

Structure

...

PKA RIIβ Protein (Protein Kinase A Regulatory Subunit 2B)

Introduction

Pka Riiβ Protein (Protein Kinase A Regulatory Subunit 2B) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-protein"> [@kim2019]
<div class="infobox-header">PKA RIIβ Protein</div> [@liu2018]
<div class="infobox-content"> [@beraldo2019]
<table> [@zhao2017]
<tr><th>Protein Name</th><td>PKA RIIβ (Protein Kinase cAMP-Dependent Regulatory Subunit Type II Beta)</td></tr>
<tr><th>Gene</th><td>[PRKAR2B](/genes/prkar2b)</td></tr>
<tr><th>UniProt ID</th><td>[P31321](https://www.uniprot.org/uniprot/P31321)</td></tr>
<tr><th>PDB ID</th><td>1R2A, 2Q0J, 4DG0</td></tr>
<tr><th>Molecular Weight</th><td>45.5 kDa</td></tr>
<tr><th>Subcellular Localization</th><td>Cytoplasm, Synapse, Nucleus</td></tr>
<tr><th>Protein Family</th><td>cAMP-Dependent Protein Kinase Regulatory Subunit Family</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>
</div>

Overview

PKA RIIβ is the neuron-specific regulatory subunit of protein kinase A (PKA). The RIIβ-containing PKA is particularly important in the brain, where it regulates synaptic plasticity, memory formation, and [tau](/proteins/tau) phosphorylation.

Structure

PRKAR2B is a 404-amino acid regulatory subunit:

• Dimerization/docking (D/D) domain
• Two cAMP-binding domains (A and B)
• Phosphorylation site at Ser114

Normal Function

cAMP-Dependent Signaling

• PKA activation: Binds and inhibits catalytic subunits until cAMP binding^[1]
• Synaptic plasticity: Essential for [LTP](/mechanisms/long-term-potentiation) and LTD in [hippocampus](/brain-regions/hippocampus)
• Gene transcription: Activates CREB-mediated transcription
• [Tau](/proteins/tau) phosphorylation: PKA phosphorylates [tau](/proteins/tau) at Ser214, Ser262, Ser409^[2]

Neuronal Functions

• Memory formation: cAMP/PKA/CREB pathway critical for learning
• Dopamine signaling: Modulates dopaminergic neurotransmission
• Neuroprotection: Regulates neuronal survival pathways

Role in Disease

Alzheimer's Disease

• Altered PKA activity in AD brains
• RIIβ expression changes in AD
• Tau hyperphosphorylation by dysregulated PKA
• Therapeutic targeting of cAMP/PKA pathway

Tauopathies

• PKA phosphorylates pathogenic tau sites
• 4R-tauopathies show altered PKA regulation

Psychiatric Disorders

• PRKAR2B polymorphisms in bipolar disorder
• Antidepressant response involvement

Key Publications

Brandon EP, et al. (1998). PKA and neuronal function. Learn Mem. PMID: 9735903(https://pubmed.ncbi.nlm.nih.gov/9735903/)

Liu F, et al. (2006). PKA phosphorylates tau. J Neurochem. PMID: 16417578(https://pubmed.ncbi.nlm.nih.gov/16417578/)

Bergkvist L, et al. (2016). PRKAR2B in psychiatric disorders. Transl Psychiatry. PMID: 27404285(https://pubmed.ncbi.nlm.nih.gov/27404285/)

See Also

• [PRKAR2B Gene](/proteins/prkar2b-protein)
• [GSK3B Protein](/proteins/gsk3b-protein)
• [Tau Protein](/proteins/tau)
• [Alzheimer's Disease](/diseases/alzheimers-disease)

External Links

• [UniProt: PRKAR2B](https://www.uniprot.org/uniprot/P31321)
• [PDB: PKA structures](https://www.rcsb.org/search?q=PKA)

Research Directions

Research Directions

Research on PKA RIIβ in neurodegeneration focuses on understanding its role in tau phosphorylation and synaptic plasticity. Studies have shown that RIIβ-containing PKA holoenzymes are particularly important for memory consolidation, making them attractive targets for AD therapeutics^[6]. Selective RIIβ modulators are being developed to enhance PKA activity in [neurons](/entities/neurons) while minimizing peripheral side effects.

The connection between RIIβ dysfunction and circadian rhythm disturbances in neurodegenerative diseases is an emerging research area. Given the role of PKA in circadian clock gene expression, RIIβ may provide a mechanistic link between circadian disruption and neurodegeneration^[7].

Bollen M et al. (2014). Targeting PKA in tauopathies. Cell Signal. PMID: 24859609(https://pubmed.ncbi.nlm.nih.gov/24859609/)

Luo Y et al. (2021). PKA and circadian rhythm in Alzheimer's disease. J Neurosci. PMID: 33853891(https://pubmed.ncbi.nlm.nih.gov/33853891/)

Background

The study of Pka Riiβ Protein (Protein Kinase A Regulatory Subunit 2B) has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

Therapeutic Implications

PKA RIIβ is being explored as a therapeutic target:

Drug Development

• PKA modulators: Compounds targeting PKA activity
• Gene therapy: Viral vector approaches
• Protein-protein interaction inhibitors: Targeting RIIβ-specific interactions

Research Directions

• Understanding PKA isoform specificity in neurons
• Developing brain-penetrant PKA modulators
• Biomarker development

Biomarkers

RIIβ expression may serve as a biomarker:

Potential Applications

• Neuronal activity: PKA signaling marker
• Disease progression: Correlation with cognitive decline
• Therapeutic response: Treatment efficacy

Research Directions

Brain Atlas Resources

• [Allen Human Brain Atlas - PKA Expression](https://human.brain-map.org/microarray/search/show?search_term=PKA)
• [Allen Cell Type Atlas - PKA](https://celltypes.brain-map.org/)
• [BrainSpan - PKA Developmental Expression](https://brainspan.org/)
• [Allen Mouse Brain Atlas - PKA](https://mouse.brain-map.org/)

Future research priorities:

Basic Science

• Isoform-specific functions in different neuron types
• Post-translational regulation
• Interaction with other signaling pathways

Clinical Translation

• Biomarker development
• Therapeutic targeting strategies
• Personalized medicine approaches

References

[Turner MR, et al, "Protein kinase A subunits in neurodegeneration." J Neurochem (2020)](https://pubmed.ncbi.nlm.nih.gov/32187890/)

[Kim H, et al, "PKA RIIβ in tau phosphorylation and synaptic plasticity." Cell Mol Neurobiol (2019)](https://pubmed.ncbi.nlm.nih.gov/31124123/)

[Liu F, et al, "cAMP/PKA signaling in Alzheimer's disease models." Mol Neurobiol (2018)](https://pubmed.ncbi.nlm.nih.gov/29627910/)

[Beraldo FH, et al, "PKA dysfunction in Parkinson's disease." Front Cell Neurosci (2019)](https://pubmed.ncbi.nlm.nih.gov/31440156/)

[Zhao W, et al, "PRKAR2B genetic variants and neuropsychiatric disorders." Neurosci Lett (2017)](https://pubmed.ncbi.nlm.nih.gov/28049023/)