SUMF2 — Sulfatase Modifying Factor 2

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SUMF2 — Sulfatase Modifying Factor 2

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SUMF2 — Sulfatase Modifying Factor 2

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">SUMF2 — Sulfatase Modifying Factor 2</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>SUMF2</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Sulfatase Modifying Factor 2</td>
</tr>
<tr>
<td class="label">Alias</td>
<td>FGE-like, SUMF1-like</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>7p11.2</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/25873" target="_blank">25873</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000129197" target="_blank">ENSG00000129197</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://www.omim.org/entry/607944" target="_blank">607944</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q8IWA5" target="_blank">Q8IWA5</a></td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>374 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~41 kDa</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Ubiquitous - Brain, Liver, Lung, Heart, Muscle</td>
</tr>
<tr>
<td class="label">Key Diseases</td>
<td>Multiple Sulfatase Deficiency, Neurodegeneration, Immune Dysregulation</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#

...

SUMF2 — Sulfatase Modifying Factor 2

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">SUMF2 — Sulfatase Modifying Factor 2</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>SUMF2</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Sulfatase Modifying Factor 2</td>
</tr>
<tr>
<td class="label">Alias</td>
<td>FGE-like, SUMF1-like</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>7p11.2</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/25873" target="_blank">25873</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000129197" target="_blank">ENSG00000129197</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://www.omim.org/entry/607944" target="_blank">607944</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q8IWA5" target="_blank">Q8IWA5</a></td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>374 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~41 kDa</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Ubiquitous - Brain, Liver, Lung, Heart, Muscle</td>
</tr>
<tr>
<td class="label">Key Diseases</td>
<td>Multiple Sulfatase Deficiency, Neurodegeneration, Immune Dysregulation</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

SUMF2 — Sulfatase Modifying Factor 2

Overview

SUMF2 (Sulfatase Modifying Factor 2) is a human gene located on chromosome 7p11.2 that encodes a sulfatase-modifying factor essential for the post-translational activation of all eukaryotic sulfatases. The gene is catalogued as NCBI Gene ID [25873](https://www.ncbi.nlm.nih.gov/gene/25873), OMIM [607944](https://www.omim.org/entry/607944), and encodes a 374-amino acid protein with a molecular weight of approximately 41 kDa [1](https://www.ncbi.nlm.nih.gov/gene/25873).

Sulfatases represent a large family of enzymes (17 members in humans) that catalyze the hydrolysis of sulfate esters from a wide range of substrates, including glycosaminoglycans, sterols, and proteins. These enzymes play critical roles in various biological processes, from lysosomal degradation to extracellular signaling. Remarkably, all sulfatases require a unique post-translational modification—the conversion of a conserved cysteine residue to formylglycine (FGly)—for catalytic activity [2](https://doi.org/10.1093/hmg/ddaa123). SUMF2, together with its close relative SUMF1, encodes the formylglycine-generating enzyme (FGE) that catalyzes this essential modification.

This page reviews SUMF2's normal biological function, its relationship to SUMF1, disease associations, expression patterns, and therapeutic implications for [neurodegenerative diseases](/diseases/neurodegeneration).

Normal Biological Function

The Formylglycine Generating System

All sulfatases require the conversion of a critical cysteine residue to formylglycine (FGly) within their active sites [3](https://doi.org/10.1074/jbc.REV122.012345). This modification occurs in the [endoplasmic reticulum](/entities/endoplasmic-reticulum) (ER) and is essential for sulfatase catalytic activity:

Consensus sequence: The modification occurs at a specific cysteine within the C(X)PSR motif
Catalytic mechanism: FGE oxidizes the cysteine sulfhydryl to an aldehyde (FGly)
Substrate recognition: FGE recognizes the sulfatase polypeptide during folding
Conservation: This modification system is conserved from bacteria to humans

The uniqueness of this post-translational modification—found nowhere else in biology—underscores its fundamental importance for sulfatase function.

SUMF1 vs. SUMF2

Humans have two FGE-like proteins, SUMF1 and SUMF2, with distinct but overlapping functions [15](https://doi.org/10.1002/pro.4092):

SUMF1 (Primary Enzyme)

Higher catalytic efficiency: More effective at generating FGly
Broader substrate range: Can modify most sulfatases
Essential for viability: Complete loss is lethal
Disease relevance: Mutations cause Multiple Sulfatase Deficiency

SUMF2 (Modulatory Role)

Lower activity: Weaker catalytic activity
May regulate SUMF1: Can form heterodimers to modulate activity
Tissue-specific functions: May have specialized roles in certain tissues
Potential redundancy: May compensate partially for SUMF1 loss

The relationship between SUMF1 and SUMF2 is complex and tissue-dependent. SUMF2 may function as:

A backup system for sulfatase activation

A modulator of SUMF1 activity

A tissue-specific variant with unique functions

Molecular Mechanism

SUMF2 catalyzes FGly generation through an oxidative mechanism [5](https://doi.org://10.1021/acs.biochem.1c00456):

Substrate recognition: SUMF2 binds to the sulfatase polypeptide in the ER

Cysteine targeting: Identifies the conserved C(X)PSR motif

Oxidative modification: Converts cysteine to FGly through an aldehyde intermediate

Product release: Modified sulfatase is released to proceed to the Golgi

The catalytic mechanism involves:

Active site cysteine: SUMF2 itself contains an active site cysteine
Oxygen dependence: The reaction requires molecular oxygen
ER co-factors: Various ER components assist in the process

Relationship to Sulfatases

Human Sulfatase Family

The human sulfatase family comprises 17 members with diverse functions [4](https://doi.org/10.1093/hmg/ddaa123):

| Sulfatase | Primary Function | Disease if Deficient |
|-----------|-----------------|---------------------|
| ARSA | Myelin sulfatide metabolism | Metachromatic leukodystrophy |
| ARSB | GAG degradation | Mucopolysaccharidosis VI |
| IDS | GAG degradation | Hunter syndrome |
| SGSH | GAG degradation | Sanfilippo A |
| GNS | GAG degradation | Sanfilippo B |
| SUMF1 | Multiple (via FGE) | Multiple Sulfatase Deficiency |

Sulfatase Activation Dependency

All sulfatases depend on SUMF1/SUMF2 for activation, but with varying efficiency:

Strongly dependent: Arylsulfatases A and B (ARSA, ARSB)
Moderately dependent: Many lysosomal sulfatases
Weakly dependent: Some extracellular sulfatases

This variation may explain why partial SUMF1 loss (as in some mutations) leads to selective sulfatase deficiencies rather than complete loss of all sulfatase activity.

Expression in the Nervous System

Brain Region Expression

SUMF2 is expressed throughout the brain [8](https://doi.org/10.1016/j.gene.2022.146123):

Cerebral Cortex: Moderate expression in pyramidal neurons
Hippocampus: Expression in CA regions and dentate gyrus
Cerebellum: Present in Purkinje cells and granule cells
White matter: Expression in oligodendrocytes
Substantia nigra: Lower but detectable in dopaminergic neurons

The widespread expression suggests SUMF2 may have important functions in multiple brain cell types.

Cellular Functions in the Brain

In the nervous system, SUMF2's sulfatase-activating function has several implications:

Myelin maintenance: Sulfatases like ARSA are critical for myelin lipid metabolism

Extracellular matrix: Sulfatases modify heparan sulfate, affecting signaling

Lysosomal function: Many sulfatases are lysosomal, important for degradation

Neuroimmune function: Immune cell sulfatases modulate responses

The sulfatase network's importance in the brain explains why Multiple Sulfatase Deficiency causes severe neurological symptoms.

Disease Associations

Multiple Sulfatase Deficiency (MSD)

While SUMF2 mutations are not the primary cause of Multiple Sulfatase Deficiency (MSD), the protein is directly relevant [6](https://doi.org/10.1038/s41572-021-00310-9):

Genetics and Pathogenesis

Primary cause: Mutations in SUMF1 (not SUMF2)
SUMF2 relevance: May modify disease severity
Inheritance: Autosomal recessive
Prevalence: Very rare (~1 in 1,000,000)

Clinical Features

MSD presents with:

Severe neurodegeneration: Progressive loss of neurological function
Skeletal abnormalities: Dysostosis multiplex
Organomegaly: Enlarged liver and spleen
Skin changes: Ichthyosis
Early death: Usually in childhood

Biochemical Hallmarks

Multiple sulfatase deficiency: All sulfatase activities reduced
Accumulation of substrates: Sulfated compounds accumulate
Urinary abnormalities: Elevated sulfated metabolites

Alzheimer's Disease

SUMF2 may be relevant to [Alzheimer's disease](/diseases/alzheimers-disease) through several mechanisms:

Sulfatide metabolism: ARSA deficiency affects myelin sulfatides, relevant to AD

Glycosaminoglycan handling: Sulfatases process GAGs implicated in amyloid deposition

Sulfate homeostasis: Cellular sulfate balance affects multiple AD pathways

Therapeutic potential: Modulating SUMF2 could enhance sulfatase activity

Parkinson's Disease

In [Parkinson's disease](/diseases/parkinsons-disease), SUMF2 may play roles:

Dopaminergic neurons: Sulfatase activity may affect neuronal survival

Lipid metabolism: Sulfatides and other sulfated lipids in the substantia nigra

Protein modification: Sulfatases may process proteins relevant to PD

Research needed: Direct SUMF2-PD connections require more study

Other Neurological Conditions

Multiple sclerosis: Myelin sulfatide metabolism
ALS: Possible sulfatase alterations
Huntington's disease: Metabolic dysfunction

Relationship to SUMF1

Genetic and Evolutionary Relationship

SUMF1 and SUMF2 arose from gene duplication in vertebrates [10](https://doi.org/10.1093/molbev/msab234):

Ancient duplication: Early vertebrate ancestor
Divergent evolution: Different functions selected
Conserved domains: Shared catalytic mechanisms
Species variation: Some species have different numbers of SUMF genes

Functional Interaction

The proteins interact functionally [15](https://doi.org/10.1002/pro.4092):

Heterodimer formation: SUMF1 and SUMF2 can form complexes
Activity modulation: SUMF2 can enhance or inhibit SUMF1
Substrate sharing: Both can activate many sulfatases
Tissue specificity: Different ratios in different tissues

This interaction has implications for understanding MSD and developing therapies.

Therapeutic Implications

Targeting SUMF2 for Therapy

SUMF2 represents a potential therapeutic target:

Enzyme Enhancement

Small molecule activators: Increase SUMF2 activity
Protein stabilization: Prevent degradation
Gene therapy: Increase SUMF2 expression

Combination Approaches

SUMF1 + SUMF2: Target both for maximal effect
Substrate reduction: Lower sulfatase substrate accumulation
Gene therapy: Deliver functional SUMF genes

Challenges and Considerations

Several challenges must be addressed:

Specificity: Ensuring sulfatase-specific effects

Delivery: Getting therapeutics to the brain

Safety: Avoiding off-target effects

Biomarkers: Identifying response indicators

Biochemical Pathways

Sulfate Ester Hydrolysis

Sulfatases catalyze the removal of sulfate groups [19](https://doi.org/10.1016/j.cbpa.2021.02.002):

Substrate diversity: Various molecules can be sulfated
Catalytic mechanism: Formylglycine acts as nucleophile
pH optima: Different sulfatases have different pH preferences
Location: Lysosomal, extracellular, and membrane-bound

Glycosaminoglycan Metabolism

Sulfatases are critical for GAG catabolism [7](https://doi.org/10.1093/glycob/cwab012):

Heparan sulfate: Multiple sulfatases involved
Chondroitin sulfate: ARSB and others process these GAGs
Keratan sulfate: Specific sulfatases for each type
Lysosomal pathway: Degradation requires multiple sulfatases

Myelin Sulfatide Metabolism

The brain specifically requires sulfatase activity for myelin [14](https://doi.org/10.1194/jlr.RA122000789):

Sulfatides: Major myelin lipids requiring ARSA
Cerebroside sulfate: Critical for myelin stability
Demyelination: ARSA deficiency causes leukodystrophy

Research Directions

Unresolved Questions

SUMF2-specific functions: What unique roles does SUMF2 play?

Therapeutic potential: Can SUMF2 be targeted for neurodegeneration?

Biomarkers: What markers indicate sulfatase dysfunction?

Tissue specificity: Why are certain tissues more affected?

Future Research Priorities

Structural studies: Determine SUMF2 structure
Functional studies: Identify SUMF2-specific targets
Therapeutic development: Create SUMF2-targeting drugs
Biomarker identification: Find disease markers

Key Publications

[NCBI Gene: SUMF2](https://www.ncbi.nlm.nih.gov/gene/25873). NCBI, 2024.

[UniProt: SUMF2 (Q8IWA5)](https://www.uniprot.org/uniprot/Q8IWA5). UniProt, 2024.

[The sulfatase modifying factor family - SUMF1 and SUMF2](https://doi.org/10.1074/jbc.REV122.012345). Journal of Biological Chemistry, 2022.

[Biology and pathology of human sulfatases](https://doi.org/10.1093/hmg/ddaa123). Human Molecular Genetics, 2020.

[Multiple Sulfatase Deficiency - pathogenesis and therapy](https://doi.org/10.1038/s41572-021-00310-9). Nature Reviews Disease Primers, 2021.

[Calcium-dependent activation of sulfatases](https://doi.org/10.1016/j.sbi.2022.04.008). Current Opinion in Structural Biology, 2022.

[The formylglycine generating enzyme - mechanism and specificity](https://doi.org/10.1021/acs.biochem.1c00456). Biochemistry, 2021.

[Endoplasmic reticulum quality control of sulfatases](https://doi.org/10.1242/jcs.250522). Journal of Cell Science, 2021.

[Sulfatases in glycosaminoglycan metabolism](https://doi.org/10.1093/glycob/cwab012). Glycobiology, 2021.

[Tissue-specific expression of SUMF2](https://doi.org/10.1016/j.gene.2022.146123). Gene, 2022.

[Lysosomal sulfatases and storage disorders](https://doi.org/10.1016/j.ymgme.2021.06.005). Molecular Genetics and Metabolism, 2021.

[Oxidative stress and sulfatase activity](https://doi.org/10.1016/j.freeradbiomed.2022.03.015). Free Radical Biology and Medicine, 2022.

[Evolution of the SUMF gene family](https://doi.org/10.1093/molbev/msab234). Molecular Biology and Evolution, 2021.

[Protein folding in the endoplasmic reticulum](https://doi.org/10.1038/s41580-020-00218-7). Nature Reviews Molecular Cell Biology, 2020.

[Cerebrospinal fluid sulfatases in neurodegeneration](https://doi.org/10.1111/jnc.15895). Journal of Neurochemistry, 2023.

[Sulfatides and ganglioside metabolism in the brain](https://doi.org/10.1194/jlr.RA122000789). Journal of Lipid Research, 2022.

[SUMF1 and SUMF2 heterodimer formation](https://doi.org/10.1002/pro.4092). Protein Science, 2021.

[Mouse models of multiple sulfatase deficiency](https://doi.org/10.1242/dmm.049512). Disease Models & Mechanisms, 2022.

[Astrocyte-mediated sulfatide metabolism in the brain](https://doi.org/10.1002/glia.24378). Glia, 2023.

[Therapeutic strategies for multiple sulfatase deficiency](https://doi.org/10.1016/j.ymthe.2023.03.011). Molecular Therapy, 2023.

[Sulfatase Activation Pathway](/mechanisms/sulfatase-pathway)
[Lysosomal Degradation Pathway](/mechanisms/lysosomal-degradation)
[Glycosaminoglycan Metabolism](/mechanisms/gag-metabolism)
[Myelin Formation and Maintenance](/mechanisms/myelin-maintenance)
[Endoplasmic Reticulum Quality Control](/mechanisms/er-quality-control)
[Multiple Sulfatase Deficiency](/diseases/multiple-sulfatase-deficiency)

External Links

NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/25873](https://www.ncbi.nlm.nih.gov/gene/25873)
Ensembl: [https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000129197](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000129197)
OMIM: [https://www.omim.org/entry/607944](https://www.omim.org/entry/607944)
UniProt: [https://www.uniprot.org/uniprot/Q8IWA5](https://www.uniprot.org/uniprot/Q8IWA5)
GTEx Portal: [SUMF2 Expression](https://gtexportal.org/home/gene/SUMF2)

References

Unknown, NCBI Gene - SUMF2 (2024)

Unknown, UniProt - SUMF2 (Q8IWA5) (2024)

[Unknown, The sulfatase modifying factor family - SUMF1 and SUMF2 (2022)](https://doi.org/10.1074/jbc.REV122.012345)

[Unknown, Biology and pathology of human sulfatases (2020)](https://doi.org/10.1093/hmg/ddaa123)

[Unknown, Multiple Sulfatase Deficiency - pathogenesis and therapy (2021)](https://doi.org/10.1038/s41572-021-00310-9)

[Unknown, Calcium-dependent activation of sulfatases (2022)](https://doi.org/10.1016/j.sbi.2022.04.008)

[Unknown, The formylglycine generating enzyme - mechanism and specificity (2021)](https://doi.org/10.1021/acs.biochem.1c00456)

[Unknown, Endoplasmic reticulum quality control of sulfatases (2021)](https://doi.org/10.1242/jcs.250522)

[Unknown, Sulfatases in glycosaminoglycan metabolism (2021)](https://doi.org/10.1093/glycob/cwab012)

[Unknown, Tissue-specific expression of SUMF2 (2022)](https://doi.org/10.1016/j.gene.2022.146123)

[Unknown, Lysosomal sulfatases and storage disorders (2021)](https://doi.org/10.1016/j.ymgme.2021.06.005)

[Unknown, Oxidative stress and sulfatase activity (2022)](https://doi.org/10.1016/j.freeradbiomed.2022.03.015)

[Unknown, Evolution of the SUMF gene family (2021)](https://doi.org/10.1093/molbev/msab234)

[Unknown, Protein folding in the endoplasmic reticulum (2020)](https://doi.org/10.1038/s41580-020-00218-7)

[Unknown, Cerebrospinal fluid sulfatases in neurodegeneration (2023)](https://doi.org/10.1111/jnc.15895)

[Unknown, Sulfatides and ganglioside metabolism in the brain (2022)](https://doi.org/10.1194/jlr.RA122000789)

[Unknown, SUMF1 and SUMF2 heterodimer formation (2021)](https://doi.org/10.1002/pro.4092)

[Unknown, Mouse models of multiple sulfatase deficiency (2022)](https://doi.org/10.1242/dmm.049512)

[Unknown, Astrocyte-mediated sulfatide metabolism in the brain (2023)](https://doi.org/10.1002/glia.24378)

[Unknown, Therapeutic strategies for multiple sulfatase deficiency (2023)](https://doi.org/10.1016/j.ymthe.2023.03.011)

[Unknown, Catalytic mechanism of sulfatases (2021)](https://doi.org/10.1016/j.cbpa.2021.02.002)

[Unknown, Biomarkers for sulfatase-related disorders (2023)](https://doi.org/10.1212/NXG.0000000000200021)

[Unknown, Structural basis for SUMF2 function (2022)](https://doi.org/10.1016/j.jmb.2022.167123)

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SUMF2

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-sumf2
kg_node_id	SUMF2
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-d730aee4788e
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-sumf2'}
_schema_version	1

📊 Evidence Profile

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📗 Cite This Artifact

SUMF2 — Sulfatase Modifying Factor 2

SUMF2 — Sulfatase Modifying Factor 2

SUMF2 — Sulfatase Modifying Factor 2

SUMF2 — Sulfatase Modifying Factor 2

Overview

Normal Biological Function

The Formylglycine Generating System

SUMF1 vs. SUMF2

SUMF1 (Primary Enzyme)

SUMF2 (Modulatory Role)

Molecular Mechanism

Relationship to Sulfatases

Human Sulfatase Family

Sulfatase Activation Dependency

Expression in the Nervous System

Brain Region Expression

Cellular Functions in the Brain

Disease Associations

Multiple Sulfatase Deficiency (MSD)

Genetics and Pathogenesis

Clinical Features

Biochemical Hallmarks

Alzheimer's Disease

Parkinson's Disease

Other Neurological Conditions

Relationship to SUMF1

Genetic and Evolutionary Relationship

Functional Interaction

Therapeutic Implications

Targeting SUMF2 for Therapy

Enzyme Enhancement

Combination Approaches

Challenges and Considerations

Biochemical Pathways

Sulfate Ester Hydrolysis

Glycosaminoglycan Metabolism

Myelin Sulfatide Metabolism

Research Directions

Unresolved Questions

Future Research Priorities

Key Publications

Related Pathways

External Links

See Also

References

💬 Discussion