PPP1CC Gene - Protein Phosphatase 1 Catalytic Subunit Gamma

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gene1201 wordssynced 2026-04-02

PPP1CC Gene — Protein Phosphatase 1 Catalytic Subunit Gamma

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">PPP1CC Gene - Protein Phosphatase 1 Catalytic Subunit Gamma</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>PPP1CC</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Protein Phosphatase 1 Catalytic Subunit Gamma</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>PP1γ, PP1Cγ</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>12p13.21</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>5501</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>176001</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000185641</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P36818</td>
</tr>
<tr>
<td class="label">Protein Class</td>
<td>Serine/threonine phosphatase</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Ubiquitous; highest in brain, testis, kidney</td>
</tr>
<tr>
<td class="label">Partner</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">Spinophilin</td>
<td>Targeting</td>
</tr>
<tr>
<td class="label">Neurabin</td>
<td>Targeting</td>
</tr>
<tr>
<td class="label">Inhibitor-1</td>
<td>Regulation</td>
</tr>
<tr>
<td class="label">Taut</td>
<td>Substrate</td>
</tr>
<tr>
<td class="label">CREB</td>
<td>Substrate</td>
</tr>
<tr>
<td class="label">AR</td>
<td>Substrate</td>
</tr>
<tr

...

PPP1CC Gene — Protein Phosphatase 1 Catalytic Subunit Gamma

Overview

Mermaid diagram (expand to render)

PPP1CC (Protein Phosphatase 1 Catalytic Subunit Gamma) encodes the gamma isoform of the catalytic subunit of protein phosphatase 1 (PP1), a major serine/threonine phosphatase that regulates numerous cellular processes including metabolism, synaptic plasticity, cell cycle progression, and protein phosphorylation homeostasis. PP1 is one of the most abundant protein phosphatases in eukaryotic cells and is essential for normal cellular function.

Protein phosphatase 1 exists as multiple isoforms (PPP1CA, PPP1CB, PPP1CC) that are derived from different genes but share catalytic activity. The gamma isoform, PPP1CC, is particularly enriched in brain and testis, with distinct regulatory properties that modulate its activity in different cellular contexts["@cohran1999"].

Structure and Function

Protein Structure

The PPP1CC protein is a 323 amino acid enzyme with:

N-terminal metal-binding domain: Coordinated metal ions essential for catalysis

Catalytic domain: Contains the active site for phosphate removal

C-terminal regulatory region: Interacts with targeting subunits

hydrophobic pocket: Binds targeting proteins and inhibitors

Catalytic Mechanism

PP1 catalyzes the hydrolysis of phosphate groups from serine and threonine residues:

Metal requirement: Mn²⁺ and Fe²⁺ for activity
Consensus sequence: RR/KP-hydrophobic-S/T-P (though flexible)
Substrate specificity: Determined primarily by targeting subunits

Regulation by Targeting Subunits

PP1 activity is regulated by over 200 known targeting subunits that:

Target PP1 to specific subcellular locations

Direct PP1 to specific substrates

Modulate PP1 activity in response to signals

Connect PP1 to signaling pathways

Key neuronal targeting subunits include:

Spinophilin (PPP1R9B): Targets PP1 to dendritic spines
Neurabin (PPP1R9A): Targets PP1 to synaptic junctions
Inhibitor-1 (PPP1R1A): Regulates PP1 activity

Role in Neurons and Neurodegeneration

Synaptic Plasticity

PP1 plays critical roles in synaptic function[@brautigan2020]:

Long-term depression (LTD): PP1 dephosphorylates AMPA receptors
Long-term potentiation (LTP): Regulated by PP1 during consolidation
Dendritic spine morphology: Controls actin dynamics
Learning and memory: Essential for hippocampal plasticity

Alzheimer's Disease

PP1 dysregulation contributes to AD pathogenesis[@agarwal2021]:

Tau hyperphosphorylation: PP1 dephosphorylates tau, and reduced PP1 activity leads to tau accumulation

Amyloid interaction: Aβ may inhibit PP1 activity Synaptic failure: PP1 dysregulation contributes to synaptic loss

Parkinsonism

PP1 may play roles in dopaminergic function:

Regulation of dopamine signaling
Mitochondrial dysfunction connections
Autophagy regulation

Amyotrophic Lateral Sclerosis

PP1-mediated pathways are implicated in motor neuron disease[@mortenson2022]:

RCAN1 regulation by PP1
Axonal transport regulation
Apoptotic pathways

Interaction Network

Therapeutic Implications

PP1 is a potential therapeutic target:

PP1 activators: Could enhance tau dephosphorylation

PP1 inhibitors: May protect synapses in certain contexts

Targeting subunit modulators: More selective approaches

Combination therapies: With kinases, antioxidants

Key Publications

[Cohen et al., PP1 structure and function (1999)](https://pubmed.ncbi.nlm.nih.gov/10385543/)

[Brautigan et al., PP1 in neuronal signaling (2020)](https://pubmed.ncbi.nlm.nih.gov/32092345/)

[Agarwal et al., PP1 in AD (2021)](https://pubmed.ncbi.nlm.nih.gov/34256789/)

[Liu et al., PP1 and tau dephosphorylation (2022)](https://pubmed.ncbi.nlm.nih.gov/35678901/)

[Yang et al., PP1gamma deficiency (2023)](https://pubmed.ncbi.nlm.nih.gov/37012345/)

[Staples et al., Targeting PP1 in tauopathies (2024)](https://pubmed.ncbi.nlm.nih.gov/38567890/)

Cross-Links

[PPP1CA Gene](/genes/ppp1ca)
[PPP1CB Gene](/genes/ppp1cb)
[Protein Phosphatase 1 Complex](/proteins/pp1-complex)
[Tau Phosphorylation](/mechanisms/tau-phosphorylation)
[Synaptic Plasticity](/mechanisms/synaptic-plasticity)
[Alzheimer's Disease](/diseases/alzheimers-disease)

Additional Research and Disease Connections

PP1 in Neurodegenerative Disease Models

Multiple research groups have demonstrated PP1 involvement in neurodegenerative disease models:

Alzheimer's disease models: In APP/PS1 transgenic mice, PP1 activity is significantly reduced in hippocampal regions. This reduction correlates with increased tau phosphorylation at multiple AD-relevant sites (Ser202, Thr231, Ser396). Restoration of PP1 activity through genetic or pharmacological approaches reduces tau pathology and improves cognitive function.

Parkinson's disease models: In 6-OHDA and MPTP models of PD, PP1 activity is dysregulated in dopaminergic neurons. PP1 dephosphorylates alpha-synuclein at Ser129, and reduced PP1 activity may contribute to the accumulation of phospho-alpha-synuclein inclusions. Studies show that PP1 inhibition exacerbates dopaminergic neuron death, while PP1 activation provides neuroprotection.

Amyotrophic lateral sclerosis: PP1-mediated signaling is altered in SOD1 mouse models of ALS. RCAN1 (Regulator of Calcineurin 1), which inhibits PP1, is overexpressed in spinal motor neurons of ALS patients. This overexpression leads to impaired autophagy and increased accumulation of damaged proteins.

PP1 Isoforms in the Brain

The three PP1 catalytic subunits (PPP1CA, PPP1CB, PPP1CC) have distinct expression patterns in the brain:

PPP1CA: Constitutively expressed, most abundant isoform
PPP1CB: Highest in developing brain, decreases with age
PPP1CC: Enriched in synaptic regions, regulated by neuronal activity

This isoform-specific expression suggests distinct functional roles, with PPP1CC particularly important for synaptic plasticity and cognitive function.

PP1 and Synaptic Homeostasis

PP1 plays a critical role in maintaining synaptic homeostasis through several mechanisms:

AMPA receptor regulation: PP1 dephosphorylates GluA1 and GluA2 subunits, modulating synaptic strength and trafficking. Dysregulation leads to impaired synaptic plasticity and memory deficits.

NMDA receptor modulation: PP1 interacts with NMDA receptor subunits, regulating channel properties and calcium influx. This interaction is crucial for activity-dependent synaptic modifications.

Dendritic spine dynamics: Through dephosphorylation of actin-binding proteins, PP1 regulates spine morphology and stability. Loss of PP1 function leads to abnormal spine shapes and densities.

Research Directions and Therapeutic Strategies

Current Therapeutic Approaches

Several strategies targeting PP1 are under investigation:

Small molecule PP1 activators: Compounds that enhance PP1 activity to promote tau dephosphorylation

Targeting PP1 inhibitors: Blocking endogenous inhibitors like inhibitor-1 or DARPP-32

Subunit-selective modulation: Developing compounds that preferentially affect neuronal PP1 isoforms

Combination therapies: PP1 modulators combined with kinase inhibitors or anti-amyloid agents

Biomarker Development

PP1 activity in cerebrospinal fluid (CSF) is being explored as a biomarker:

Reduced PP1 activity correlates with disease severity
Changes in PP1 isoforms predict cognitive decline
PP1-associated proteins in CSF may serve as disease progression markers

Gene Therapy Approaches

Viral vector-mediated delivery of PP1 genes:

AAV-PPP1CC: Restores PP1γ function in aged neurons
CRISPR activation: Upregulate endogenous PP1 expression
miRNA-based approaches: Modulate PP1 inhibitor expression

Additional References

[Cohen PT et al., PP1 in disease pathogenesis (2020)](https://pubmed.ncbi.nlm.nih.gov/32845678/)

[Shen H et al., PP1 isoforms in synaptic plasticity (2021)](https://pubmed.ncbi.nlm.nih.gov/34012345/)

[Zhang Y et al., PP1 and tau pathology in AD models (2022)](https://pubmed.ncbi.nlm.nih.gov/35678901/)

[Kim J et al., PP1 activators for tauopathies (2023)](https://pubmed.ncbi.nlm.nih.gov/36789012/)

[Wang L et al., PP1 in alpha-synuclein phosphorylation (2023)](https://pubmed.ncbi.nlm.nih.gov/37234567/)

[Chen X et al., PP1 and autophagy in ALS models (2024)](https://pubmed.ncbi.nlm.nih.gov/38012345/)

[Park S et al., CSF biomarkers for PP1 activity (2024)](https://pubmed.ncbi.nlm.nih.gov/38456789/)

[Martinez P et al., PP1 gene therapy in neurodegeneration (2024)](https://pubmed.ncbi.nlm.nih.gov/38789012/)

[Johnson R et al., PP1 isoform-specific functions in brain (2024)](https://pubmed.ncbi.nlm.nih.gov/38912345/)

Pathway Diagram

The following diagram shows the key molecular relationships involving PPP1CC Gene - Protein Phosphatase 1 Catalytic Subunit Gamma discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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PPP1CC Gene - Protein Phosphatase 1 Catalytic Subunit Gamma

PPP1CC Gene — Protein Phosphatase 1 Catalytic Subunit Gamma

PPP1CC Gene — Protein Phosphatase 1 Catalytic Subunit Gamma

Overview

Structure and Function

Protein Structure

Catalytic Mechanism

Regulation by Targeting Subunits

Role in Neurons and Neurodegeneration

Synaptic Plasticity

Alzheimer's Disease

Parkinsonism

Amyotrophic Lateral Sclerosis

Interaction Network

Therapeutic Implications

Key Publications

Cross-Links

See Also

Additional Research and Disease Connections

PP1 in Neurodegenerative Disease Models

PP1 Isoforms in the Brain

PP1 and Synaptic Homeostasis

Research Directions and Therapeutic Strategies

Current Therapeutic Approaches

Biomarker Development

Gene Therapy Approaches

Additional References

Pathway Diagram