prkaca Gene

prkaca Gene

Introduction

Prkaca Gene 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-gene"> [@camppka]

| Attribute | Value | [@pkaa]
|-----------|-------| [@dopamine]
| Gene Symbol | prkaca | [@pkacreb]
| Full Name | Protein Kinase cAMP-Dependent Catalytic Subunit Alpha |
| Chromosome | 19p13.12 |
| NCBI Gene ID | [5566](https://www.ncbi.nlm.nih.gov/gene/5566) |
| OMIM ID | 601653 |
| UniProt ID | [P17612](https://www.uniprot.org/uniprot/P17612) |

</div>}

Overview

prkaca Gene

Introduction

Prkaca Gene 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-gene"> [@camppka]

| Attribute | Value | [@pkaa]
|-----------|-------| [@dopamine]
| Gene Symbol | prkaca | [@pkacreb]
| Full Name | Protein Kinase cAMP-Dependent Catalytic Subunit Alpha |
| Chromosome | 19p13.12 |
| NCBI Gene ID | [5566](https://www.ncbi.nlm.nih.gov/gene/5566) |
| OMIM ID | 601653 |
| UniProt ID | [P17612](https://www.uniprot.org/uniprot/P17612) |

</div>}

Overview

The PRKACA gene encodes the catalytic subunit alpha of protein kinase A (PKA), a crucial serine/threonine kinase that mediates cellular responses to cAMP. PKA is one of the most important downstream effectors of cAMP signaling and regulates numerous cellular processes including metabolism, gene expression, synaptic plasticity, and cell growth. PRKACA is ubiquitously expressed and essential for normal cellular function.

Molecular Function

PKA catalytic subunit (PKA-Cα) has the following enzymatic properties:

• Serine/threonine kinase: Phosphorylates serine and threonine residues
• cAMP-dependent: Activity requires binding of cAMP to regulatory subunits
• Heterotetrameric complex: R2C2 (2 regulatory + 2 catalytic subunits)
• Substrate specificity: Broad substrate range including transcription factors, ion channels, and metabolic enzymes

• Catalytic domain: Kinase domain in the C-terminal region
• Nuclear localization: Can translocate to nucleus to phosphorylate transcription factors
• Isoforms: Multiple catalytic subunit isoforms (Cα, Cβ, Cγ)
• Autophosphorylation: Regulatory serine residues

Expression Pattern

PRKACA shows widespread expression:

• Brain: High expression in [hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), cerebellum
• Subcellular: Cytosolic and nuclear compartments
• Tissue distribution: Ubiquitous expression across all tissues
• Cellular: Both [neurons](/entities/neurons) and glia

Therapeutic Implications

PKA Modulators

• cAMP analogs: 8-Br-cAMP, db-cAMP
• PKA inhibitors: H-89, KT5720
• Phosphatase inhibitors: Okadaic acid effects

Neurodegeneration

• [Tau](/proteins/tau) phosphorylation: PKA as a [tau](/proteins/tau) kinase
• Synaptic plasticity: CREB phosphorylation
• Translational control: [mTOR](/entities/mtor) pathway interactions

Animal Models

Knockout Studies

• Prkaca knockout: Embryonic lethal
• Brain-specific knockouts: Memory, learning deficits
• Transgenic overexpression: Effects on neuronal function

Disease Models

• AD models: PKA/CREB signaling alterations
• PD models: Dopamine signaling through PKA

Biomarkers

PKA Activity

• Phospho-PKA substrates: Biomarkers of PKA activity
• CSF markers: PKA in neurodegenerative disease
• Therapeutic monitoring: PKA pathway activation

Role in Neurodegenerative Diseases

Alzheimer's Disease

PKA/CREB signaling is crucial in AD:

• Memory formation: CREB phosphorylation is essential for [LTP](/mechanisms/long-term-potentiation)
• Amyloid effects: [Aβ](/proteins/amyloid-beta) disrupts cAMP/PKA signaling
• Tau phosphorylation: PKA can phosphorylate tau at multiple sites
• Synaptic plasticity: Impaired PKA signaling affects learning

Parkinson's Disease

In PD:

• Dopamine signaling: D1 receptors activate PKA via Gs
• Motor function: PKA mediates dopaminergic motor effects
• Neuroprotection: cAMP/PKA has neuroprotective properties
• L-DOPA response: Dyskinesias associated with altered PKA signaling

Huntington's Disease

• Transcription regulation: Mutant [HTT](/proteins/htt-protein) affects PKA signaling
• CREB dysfunction: Impaired CREB-mediated transcription
• Metabolic dysfunction: PKA regulates energy metabolism
• Therapeutic targeting: PKA modulators being explored

Therapeutic Implications

Targeting PKA signaling:

• Phosphodiesterase inhibitors: Enhance cAMP/PKA signaling (e.g., rolipram)
• cAMP analogs: Direct PKA activators
• PKA modulators: Specific inhibitors or activators
• Combination approaches: With other neuroprotective strategies

Animal Models

Prkaca knockout mice:

• Embryonic lethality in complete knockouts
• Tissue-specific knockouts show learning/memory deficits
• Cardiac abnormalities
• Metabolic dysregulation

See Also

• [cAMP Signaling](/mechanisms/camp-signaling)
• [CREB](/proteins/creb-protein)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Huntington's Disease](/diseases/huntington-disease)
• [Protein Kinase A](/proteins/protein-kinase-a)
• [Phosphodiesterases](/therapeutics/phosphodiesterase-inhibitors-neurodegeneration)

External Links

• [NCBI Gene - PRKACA](https://www.ncbi.nlm.nih.gov/gene/5566)
• [UniProt - PKA Cα](https://www.uniprot.org/uniprot/P17612)
• [OMIM - PRKACA](https://www.omim.org/entry/601653)

Background

The study of Prkaca Gene 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.

References

Pathway Diagram

The following diagram shows the key molecular relationships involving prkaca Gene discovered through SciDEX knowledge graph analysis: