GCLM (Glutamate-Cysteine Ligase Modifier Subunit)

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GCLM (Glutamate-Cysteine Ligase Modifier Subunit)

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GCLM (Glutamate-Cysteine Ligase Modifier Subunit)

Introduction

Gclm (Glutamate Cysteine Ligase Modifier Subunit) is a critical regulatory component in the glutathione biosynthesis pathway, playing a vital role in cellular antioxidant defense. This page provides detailed information about its structure, function, and role in neurodegenerative disease processes.

<table class="infobox infobox-protein"> [@structure]
<tr>
<th class="infobox-header" colspan="2">GCLM (Glutamate-Cysteine Ligase Modifier Subunit)</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Glutamate-Cysteine Ligase Modifier Subunit</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[GCLM](/genes/gclm)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P48507" target="_blank">P48507</a></td>
</tr>
<tr>
<td class="label">PDB ID</td>
<td>2F2K</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>31 kDa</td>
</tr>
<tr>
<td class="label">Localization</td>
<td>Cytosol</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>GCL family</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/infection" style="color:#ef9a9a">Infection</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/sepsis" style="color:#ef9a9a">Sepsis</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">46 edges</a></td>
</tr>
</table>

Overview

...

GCLM (Glutamate-Cysteine Ligase Modifier Subunit)

Introduction

Gclm (Glutamate Cysteine Ligase Modifier Subunit) is a critical regulatory component in the glutathione biosynthesis pathway, playing a vital role in cellular antioxidant defense. This page provides detailed information about its structure, function, and role in neurodegenerative disease processes.

<table class="infobox infobox-protein"> [@structure]
<tr>
<th class="infobox-header" colspan="2">GCLM (Glutamate-Cysteine Ligase Modifier Subunit)</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Glutamate-Cysteine Ligase Modifier Subunit</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[GCLM](/genes/gclm)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P48507" target="_blank">P48507</a></td>
</tr>
<tr>
<td class="label">PDB ID</td>
<td>2F2K</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>31 kDa</td>
</tr>
<tr>
<td class="label">Localization</td>
<td>Cytosol</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>GCL family</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/infection" style="color:#ef9a9a">Infection</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/sepsis" style="color:#ef9a9a">Sepsis</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">46 edges</a></td>
</tr>
</table>

Overview

GCLM (Glutamate-Cysteine Ligase Modifier Subunit) is the modifier subunit of glutamate-cysteine ligase (GCL), also known as gamma-glutamylcysteine synthetase (γGCS). GCLM enhances enzyme activity and modifies substrate affinity but lacks catalytic activity on its own. [@structure]

The GCL enzyme is the rate-limiting step in glutathione (GSH) biosynthesis, making GCLM a critical regulator of cellular antioxidant capacity. Glutathione is the most abundant intracellular antioxidant and plays essential roles in protecting cells from oxidative stress.

Gene and Protein Structure

Gene Information

The GCLM gene is located on chromosome 1p22.1 in humans and encodes a protein of 274 amino acids. The gene is responsive to oxidative stress through the Nrf2 transcription factor pathway.

Protein Structure

GCLM has several key structural features: [@regulation]

N-terminal domain: Interacts with GCLC (catalytic subunit)
Regulatory domain: Contains binding sites for glutathione feedback inhibition
Dimerization interface: Forms heterodimer with GCLC
Post-translational modification sites: Phosphorylation and oxidation affect function

Biological Function

Glutathione Biosynthesis

GCLM serves critical functions in the GSH synthesis pathway:

Enzyme complex formation: Forms heterodimer with GCLC (glutamate-cysteine ligase catalytic subunit)

Catalytic enhancement: Increases the catalytic efficiency of GCLC by 10-30 fold

Substrate affinity: Lowers the Km for glutamate, the first substrate

Feedback regulation: Reduces feedback inhibition by end-product glutathione

Stress response: Enhances responsiveness to oxidative stress

Antioxidant Defense

GCLM is central to antioxidant defense: [@glutathione]

GSH production: Controls the rate of glutathione synthesis
Redox homeostasis: Maintains cellular redox balance
Detoxification: Supports Phase II detoxification enzymes
Mitochondrial function: Protects mitochondria from oxidative damage

Role in Neurodegeneration

Parkinson's Disease

GCLM is particularly relevant to PD pathogenesis: [@gclm]

Dopaminergic vulnerability: Dopaminergic [neurons](/entities/neurons) have high oxidative stress exposure
GSH depletion: PD brains show reduced GSH levels in the substantia nigra
Genetic variants: GCLM polymorphisms affect glutathione synthesis capacity
Neuroprotection: Enhanced GCLM expression may protect dopaminergic neurons

Alzheimer's Disease

In AD, GCLM plays multiple roles: [@oxidative]

Oxidative stress: AD brains exhibit elevated oxidative markers
[Amyloid-beta](/proteins/amyloid-beta): Aβ generates [reactive oxygen species](/entities/reactive-oxygen-species) (ROS)
GCLM polymorphisms: May influence AD risk and progression
Therapeutic targeting: Nrf2 activators upregulate GCLM as a therapeutic strategy

Amyotrophic Lateral Sclerosis (ALS)

Oxidative damage: ALS involves significant oxidative stress
GCLM variants: May modify disease progression
Therapeutic potential: Enhancing GCLM could provide neuroprotection

Therapeutic Implications

Antioxidant Therapy

GCLM is a key target for neuroprotective strategies: [@nrf]

Nrf2 activators: Sulforaphane, bardoxolone methyl upregulate GCLM expression
Dietary compounds: Isothiocyanates from cruciferous vegetables enhance GCLM
Pharmacological approaches: Novel Nrf2 activators in development

Genetic Considerations

Polymorphisms: GCLM promoter variants affect expression levels
Individual variation: Genetic background influences antioxidant capacity

References

[Unknown, Glutamate-cysteine ligase modifier subunit: structure and function (n.d.)](https://pubmed.ncbi.nlm.nih.gov/14597195/)

[Unknown, Structure of the GCLM-GCLC complex (n.d.)](https://pubmed.ncbi.nlm.nih.gov/16687651/)

[Unknown, Regulation of GCLM by oxidative stress (n.d.)](https://pubmed.ncbi.nlm.nih.gov/12562807/)

[Unknown, Glutathione in neurodegenerative disease (n.d.)](https://pubmed.ncbi.nlm.nih.gov/12730442/)

[Unknown, GCLM and Parkinson's disease (n.d.)](https://pubmed.ncbi.nlm.nih.gov/14692811/)

[Unknown, Oxidative stress in Alzheimer's disease (n.d.)](https://pubmed.ncbi.nlm.nih.gov/15134840/)

[Unknown, Nrf2 as a therapeutic target (n.d.)](https://pubmed.ncbi.nlm.nih.gov/20431659/)

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Related Entities

GCLMPROTEIN

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slug	proteins-gclm-protein
kg_node_id	GCLMPROTEIN
entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-bfacb1348b7f
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-gclm-protein'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

55%

Debates

0

Incoming

11

Outgoing

12

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

GCLM (Glutamate-Cysteine Ligase Modifier Subunit)

GCLM (Glutamate-Cysteine Ligase Modifier Subunit)

Introduction

Overview

GCLM (Glutamate-Cysteine Ligase Modifier Subunit)

Introduction

Overview

Gene and Protein Structure

Gene Information

Protein Structure

Biological Function

Glutathione Biosynthesis

Antioxidant Defense

Role in Neurodegeneration

Parkinson's Disease

Alzheimer's Disease

Amyotrophic Lateral Sclerosis (ALS)

Therapeutic Implications

Antioxidant Therapy

Genetic Considerations

See Also

References

💬 Discussion