pde1b-protein

PDE1B Protein — Phosphodiesterase 1B

Introduction

Pde1B Protein — Phosphodiesterase 1B 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"> [@href2006]
<table> [@a2005]
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">Phosphodiesterase 1B</th></tr>
<tr><td><strong>Protein Name</strong></td><td>PDE1B (Calmodulin-stimulated PDE, CaM-PDE)</td></tr>
<tr><td><strong>Gene</strong></td><td>[PDE1B](/genes/pde1b)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q01065](https://www.uniprot.org/uniprot/Q01065)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Phosphodiesterase family (PDE1)</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>~59 kDa</td></tr>
<tr><td><strong>Expression</strong></td><td>Brain (striatum, hippocampus), heart, skeletal muscle</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Overview

PDE1B (Phosphodiesterase 1B) is a calcium/calmodulin-dependent phosphodiesterase that hydrolyzes cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP). It is one of 11 phosphodiesterase families in mammals, each with distinct regulatory properties and substrate specificities. PDE1B is highly expressed in brain regions associated with learning and memory.

Structure

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PDE1B Protein — Phosphodiesterase 1B

Introduction

Pde1B Protein — Phosphodiesterase 1B 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"> [@href2006]
<table> [@a2005]
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">Phosphodiesterase 1B</th></tr>
<tr><td><strong>Protein Name</strong></td><td>PDE1B (Calmodulin-stimulated PDE, CaM-PDE)</td></tr>
<tr><td><strong>Gene</strong></td><td>[PDE1B](/genes/pde1b)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q01065](https://www.uniprot.org/uniprot/Q01065)</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Phosphodiesterase family (PDE1)</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>~59 kDa</td></tr>
<tr><td><strong>Expression</strong></td><td>Brain (striatum, hippocampus), heart, skeletal muscle</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>

Overview

PDE1B (Phosphodiesterase 1B) is a calcium/calmodulin-dependent phosphodiesterase that hydrolyzes cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP). It is one of 11 phosphodiesterase families in mammals, each with distinct regulatory properties and substrate specificities. PDE1B is highly expressed in brain regions associated with learning and memory.

Structure

PDE1B has a distinctive structure:

• N-terminal regulatory domain: Contains two calcium/calmodulin-binding sites
• Catalytic domain: Carboxy-terminal region with cAMP/cGMP hydrolysis activity
• Calmodulin activation: Requires calcium-bound calmodulin for activation
• Dimerization: Forms homodimers for proper function

The enzyme is uniquely regulated by intracellular calcium levels, linking PDE1B activity to calcium-dependent signaling pathways.

Function in Neuronal Systems

Second Messenger Hydrolysis

PDE1B regulates:

• cAMP levels: Controls intracellular cAMP concentration
• cGMP levels: Also hydrolyzes cGMP, though preferentially cAMP
• Spatial signaling: Localized PDE activity creates cAMP microdomains

Calcium Signaling Integration

PDE1B connects calcium and cAMP signaling:

• Calcium influx: Activates PDE1B via calmodulin
• Signal integration: Coordinates Ca²⁺ and cAMP signaling
• Feedback regulation: Creates negative feedback loops

Synaptic Function

In [neurons](/entities/neurons), PDE1B modulates:

• Synaptic plasticity: cAMP-dependent [LTP](/mechanisms/long-term-potentiation) and LTD
• Memory formation: CREB-mediated gene expression
• Neurotransmitter release: cAMP regulation of exocytosis

Role in Neurodegeneration

Alzheimer's Disease

PDE1B is implicated in AD pathophysiology:

• cAMP dysregulation: Reduced PDE1B activity alters cAMP signaling
• Memory deficits: Impaired CREB-mediated transcription
• Amyloid effects: [Aβ](/proteins/amyloid-beta) affects PDE1B expression and function
• Calcium dysregulation: Links to Ca²⁺ homeostasis disruption

Parkinson's Disease

PDE1B plays roles in PD:

• Striatal function: High expression in striatum, affected in PD
• Dopamine signaling: cAMP regulation in dopaminergic pathways
• Neuroprotection: PDE1B inhibitors show promise in PD models
• L-DOPA-induced dyskinesias: cAMP/PDE1B involvement

Therapeutic Implications

PDE1B is a drug target:

• PDE1B inhibitors: Enhance cAMP signaling in neurodegeneration
• Cognitive enhancement: Improve memory in AD/PD
• Neuroprotection: Prevent neuronal death
• Anti-dyskinetic effects: Reduce L-DOPA-induced dyskinesias

Brain Distribution

PDE1B exhibits region-specific expression:

• Striatum: Highest expression, involved in motor control
• [Hippocampus](/brain-regions/hippocampus): Important for memory and learning
• Cerebellum: Motor coordination
• [Cortex](/brain-regions/cortex): Cognitive functions

Clinical Significance

• Neurodegenerative diseases: PDE1B dysregulation in AD, PD, HD
• Cognitive disorders: Memory impairment
• Psychiatric conditions: Depression, schizophrenia
• Cardiovascular function: Cardiac PDE1B affects contractility

Background

The study of Pde1B Protein — Phosphodiesterase 1B 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.

See Also

• [Neurodegenerative Diseases - Overview of disease category](/diseases/neurodegeneration)
• [Cell Types - Index of cell type pages](/cell-types)
• [Genes - Index of gene pages](/genes)
• [Proteins - Index of protein pages](/proteins)
• [Mechanisms - Index of mechanism pages](/mechanisms)