LIM Kinase 1 (LIMK1)

LIM Kinase 1 (LIMK1)

Introduction

Lim Kinase 1 (Limk1) 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"> [@regulation1998]
<div class="infobox-header">LIM Kinase 1 Protein</div> [@adfcofilinactin2010]
<div class="infobox-row"> [@cofilin1998]
<div class="infobox-label">Protein Name</div> [@limk2002]
<div class="infobox-value">LIM Kinase 1 (LIMK1)</div> [@referencesa]
</div>
<div class="infobox-row">
<div class="infobox-label">Gene</div>
<div class="infobox-value">[LIMK1](/genes/limk1)</div>
</div>
<div class="infobox-row">
<div class="infobox-label">UniProt ID</div>
<div class="infobox-value"><a href="https://www.uniprot.org/uniprot/P53667" target="_blank">P53667</a></div>
</div>
<div class="infobox-row">
<div class="infobox-label">Molecular Weight</div>
<div class="infobox-value">~72 kDa</div>
</div>
<div class="infobox-row">
<div class="infobox-label">Subcellular Localization</div>
<div class="infobox-value">Cytoplasm, Cytoskeleton, Lamellipodia, Growth Cones</div>
</div>
<div class="infobox-row">
<div class="infobox-label">Protein Family</div>
<div class="infobox-value">LIM kinase family</div>
</div>
</div>

Overview

LIM Kinase 1 (LIMK1)

Introduction

Lim Kinase 1 (Limk1) 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"> [@regulation1998]
<div class="infobox-header">LIM Kinase 1 Protein</div> [@adfcofilinactin2010]
<div class="infobox-row"> [@cofilin1998]
<div class="infobox-label">Protein Name</div> [@limk2002]
<div class="infobox-value">LIM Kinase 1 (LIMK1)</div> [@referencesa]
</div>
<div class="infobox-row">
<div class="infobox-label">Gene</div>
<div class="infobox-value">[LIMK1](/genes/limk1)</div>
</div>
<div class="infobox-row">
<div class="infobox-label">UniProt ID</div>
<div class="infobox-value"><a href="https://www.uniprot.org/uniprot/P53667" target="_blank">P53667</a></div>
</div>
<div class="infobox-row">
<div class="infobox-label">Molecular Weight</div>
<div class="infobox-value">~72 kDa</div>
</div>
<div class="infobox-row">
<div class="infobox-label">Subcellular Localization</div>
<div class="infobox-value">Cytoplasm, Cytoskeleton, Lamellipodia, Growth Cones</div>
</div>
<div class="infobox-row">
<div class="infobox-label">Protein Family</div>
<div class="infobox-value">LIM kinase family</div>
</div>
</div>

Overview

LIM Kinase 1 (LIMK1) is a serine/threonine kinase that plays a critical role in regulating actin cytoskeleton dynamics through phosphorylation of cofilin family proteins [@references]. LIMK1 is highly expressed in the brain, particularly in regions involved in learning and memory, and is implicated in synaptic plasticity, neuronal development, and various neurodegenerative diseases [@regulation1998].

Structure

LIMK1 contains several distinct domains:

• LIM domain: Zinc-binding domain at N-terminus involved in protein-protein interactions
• PDZ domain: Scaffold for signaling complexes
• Kinase domain: Catalytic serine/threonine kinase domain at C-terminus

Normal Function

LIMK1 is a key regulator of actin dynamics:

Regulation of LIMK1

LIMK1 activity is regulated by:

• Rho GTPases: Rac1 and Cdc42 activate LIMK1 via PAK kinases
• Phosphorylation: Autophosphorylation and activation by PAK1/PAK4
• Calcium signaling: Calmodulin-dependent pathways can modulate activity

Role in Disease

Alzheimer's Disease

LIMK1 is implicated in Alzheimer's disease through:

• Dysregulated cofilin activity leading to actin rod formation [@limk2002]
• Impaired synaptic plasticity and memory formation
• Interaction with [amyloid-beta](/proteins/amyloid-beta) pathology

Parkinson's Disease

• Altered actin dynamics in dopaminergic [neurons](/entities/neurons)
• Potential role in [alpha-synuclein](/mechanisms/alpha-synuclein) aggregation

Cancer

LIMK1 is frequently overexpressed in various cancers and promotes:

• Tumor cell migration and invasion
• Metastasis
• Angiogenesis

Therapeutic Targeting

LIMK1 inhibitors are being explored for:

• Cancer therapy (anti-metastatic)
• Treatment of Alzheimer's disease
• Wound healing modulation

Key Publications

Cross-Links

• [LIMK1 Gene](/genes/limk1) - Gene encoding this protein
• [Cofilin-1](/proteins/cofilin) - Primary substrate
• [LIMK2](/genes/limk2) - Related kinase
• [Actin Dynamics](/mechanisms/actin-dynamics) - Related mechanism

See Also

• [Proteins/Limk1](/proteins/limk1) — This page

Background

The study of Lim Kinase 1 (Limk1) 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.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

References

Pathway Diagram

The following diagram shows the key molecular relationships involving LIM Kinase 1 (LIMK1) discovered through SciDEX knowledge graph analysis: