GO:0080132 fatty acid 2-hydroxylase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0080132 (fatty acid 2-hydroxylase activity) catalyzes the hydroxylation of the C-2 position of fatty acids, either as free fatty acids or within the fatty acyl chain of a sphingolipid.
• The human FA2H gene encodes the enzyme responsible for this activity, and its expression is highest in brain and skin.
• FA2H-dependent 2-hydroxylation is critical for the synthesis of 2-hydroxy ceramides and 2-hydroxy sphingomyelin, which are abundant in myelin and the epidermis.
• Loss of FA2H function leads to altered sphingolipid profiles and has been linked to neurodegenerative disease and cancer progression.
• FA2H expression is regulated by PPARα and can be upregulated by Δ9-tetrahydrocannabinol in breast cancer cells.
• Studying GO:0080132 requires specialized methods such as GC-MS for enzyme activity and lipidomics for 2-hydroxy sphingolipid profiling.
Description
Fatty acid 2-hydroxylase activity (GO:0080132) is a molecular function that introduces a hydroxyl group at the C-2 position of fatty acids, a modification that can occur on free fatty acids or on the fatty acyl chain of sphingolipids. This activity is essential for the production of 2-hydroxy sphingolipids, which are major components of myelin and the epidermal permeability barrier. The enzyme responsible for this activity in humans is encoded by the FA2H gene, and its dysfunction has been associated with neurological disorders and cancer. Understanding GO:0080132 is therefore important for researchers studying lipid metabolism, membrane biology, and related diseases. The activity was first characterized biochemically using a GC-MS-based assay, which allowed direct measurement of 2-hydroxylase activity in vitro. Subsequent studies demonstrated that FA2H expression increases during keratinocyte differentiation and in postnatal brain development, correlating with elevated 2-hydroxy ceramide levels. These findings established FA2H as the primary enzyme responsible for fatty acid 2-hydroxylation in mammals.
fatty acid 2-hydroxylase activity At A Glance
| GO ID | GO:0080132 |
|---|---|
| GO term | fatty acid 2-hydroxylase activity |
| Ontology | molecular_function |
| Synonym | fatty acid alpha-hydroxylase activity |
| Major function | Catalyzes hydroxylation of the C-2 position of fatty acids, either free or in sphingolipids |
| EC number | Not assigned in QuickGO |
| Substrates | Free fatty acids, fatty acyl chains of sphingolipids |
| Cofactors | Molecular oxygen, NADPH (likely) |
| Cellular location | Endoplasmic reticulum membrane (inferred from enzyme family) |
What Is GO:0080132?
GO:0080132, fatty acid 2-hydroxylase activity, is defined as the catalysis of hydroxylation at the C-2 position of a fatty acid. The substrate can be a free fatty acid or a fatty acyl chain that is part of a sphingolipid. This enzymatic modification introduces a hydroxyl group, converting a fatty acid to a 2-hydroxy fatty acid. The reaction is dependent on molecular oxygen and typically uses NADPH as a cofactor, although the exact cofactor requirements may vary. The official synonym is fatty acid alpha-hydroxylase activity.
Why Is fatty acid 2-hydroxylase activity Important in Cell Biology?
GO:0080132 is important because 2-hydroxylated fatty acids and sphingolipids are critical for the structure and function of myelin and the skin barrier. Defects in this activity lead to abnormal sphingolipid profiles, which are observed in patients with FA2H mutations. Moreover, FA2H expression is linked to cancer cell migration and is regulated by nuclear receptors, making it a potential target for therapeutic intervention. Studying this activity helps elucidate fundamental lipid metabolic pathways and their roles in health and disease.
• Essential for myelin integrity: 2-hydroxy galactosylceramides are major myelin lipids.
• Required for skin barrier function: 2-hydroxy ceramides are key components of the stratum corneum.
• Mutations in FA2H cause a spectrum of neurodegenerative disorders, including spastic paraplegia.
• FA2H promotes breast cancer cell migration, suggesting a role in metastasis.
• FA2H expression is regulated by PPARα and can be modulated by cannabinoids.
• Provides a target for lipidomics and enzyme activity assays to study sphingolipid metabolism.
• Involved in host-pathogen interactions: rotavirus requires FA2H for uncoating and endosomal escape.
• Potential biomarker for differentiation status in keratinocytes and brain development.
What Happens During fatty acid 2-hydroxylase activity?
Substrate recognition and binding
In simple terms: The enzyme grabs a fatty acid molecule, either free or attached to a sphingolipid.
FA2H, the enzyme responsible for GO:0080132, recognizes and binds fatty acids or fatty acyl chains of sphingolipids. The binding likely occurs at the endoplasmic reticulum membrane, where FA2H is localized. The enzyme shows specificity for the C-2 position, distinguishing it from other hydroxylases.
Catalytic hydroxylation
In simple terms: A hydroxyl group is added to the second carbon of the fatty acid chain.
The hydroxylation reaction uses molecular oxygen and likely NADPH as a cofactor. The enzyme inserts an oxygen atom into the C-H bond at the C-2 position, converting the fatty acid to a 2-hydroxy fatty acid. This reaction is stereospecific, producing the (R)-2-hydroxy isomer.
Product release and downstream metabolism
In simple terms: The modified fatty acid is released and used to build complex sphingolipids.
After hydroxylation, the 2-hydroxy fatty acid is released and can be incorporated into ceramides and further into sphingomyelin or galactosylceramides. These 2-hydroxy sphingolipids are then transported to their final destinations, such as the myelin sheath or the skin barrier.
Regulation of enzyme levels
In simple terms: The amount of the enzyme can go up or down depending on the cell's needs.
FA2H expression is regulated at the transcriptional level. In keratinocytes, FA2H mRNA increases during differentiation, leading to higher 2-hydroxy ceramide production. In breast cancer cells, PPARα activation upregulates FA2H, while PPARβ/δ inhibition can also affect its expression.
Key Genes Involved in GO:0080132 fatty acid 2-hydroxylase activity
The following genes and proteins are directly involved in fatty acid 2-hydroxylase activity or its downstream pathways.
| Gene | Major Role | Research Relevance |
|---|---|---|
| FA2H | Encodes fatty acid 2-hydroxylase, the enzyme catalyzing GO:0080132 | Mutations cause neurodegenerative disorders; expression linked to cancer |
| PPARA | Nuclear receptor that upregulates FA2H transcription | Mediates THC-induced FA2H expression in breast cancer cells |
| PPARD | Nuclear receptor that may inhibit PPARα, affecting FA2H | Involved in regulation of FA2H in cancer |
| UGCG | Glucosylceramide synthase, downstream of 2-hydroxy ceramide | Produces 2-hydroxy glucosylceramide for myelin |
| CERS2 | Ceramide synthase 2, uses 2-hydroxy fatty acids | Generates 2-hydroxy ceramides in skin and brain |
| SMPD1 | Acid sphingomyelinase, degrades 2-hydroxy sphingomyelin | Affects 2-hydroxy sphingomyelin levels |
| SGMS1 | Sphingomyelin synthase 1, produces 2-hydroxy sphingomyelin | Determines 2-hydroxy sphingomyelin profiles |
| GALC | Galactosylceramidase, degrades 2-hydroxy galactosylceramide | Defects cause Krabbe disease, related to 2-hydroxy lipids |
| MBP | Myelin basic protein, interacts with 2-hydroxy lipids | Structural component of myelin |
| PLP1 | Proteolipid protein, major myelin protein | Myelin integrity depends on 2-hydroxy sphingolipids |
| FA2H (mouse) | Ortholog of human FA2H | Used in knockout models to study brain development |
| FA2H (rotavirus) | Host factor for rotavirus entry | Required for uncoating and endosomal escape |
| PPARα (mouse) | Regulates FA2H in liver and other tissues | Potential target for lipid modulation |
| SPTLC1 | Serine palmitoyltransferase, first step in sphingolipid synthesis | Provides substrates for 2-hydroxylation |
| SPTLC2 | Subunit of serine palmitoyltransferase | Affects sphingolipid pool available for 2-hydroxylation |
| DEGS1 | Dihydroceramide desaturase, modifies ceramides | May influence 2-hydroxy ceramide levels |
| ACER1 | Alkaline ceramidase, hydrolyzes ceramides | Affects 2-hydroxy sphingolipid turnover |
| ASAH1 | Acid ceramidase, degrades ceramides | Impacts 2-hydroxy ceramide levels |
How Is fatty acid 2-hydroxylase activity Regulated?
FA2H expression is regulated at the transcriptional level by nuclear receptors. In breast cancer cells, PPARα activation upregulates FA2H, and Δ9-tetrahydrocannabinol can induce FA2H via PPARα, counteracting PPARβ/δ-mediated inhibition. During keratinocyte differentiation, FA2H mRNA and activity increase, leading to higher 2-hydroxy ceramide synthesis. In the brain, FA2H expression peaks postnatally, correlating with myelination. Additionally, FA2H activity may be regulated by substrate availability and membrane lipid composition, although direct post-translational modifications are not well characterized.
fatty acid 2-hydroxylase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| FA2H | Spastic paraplegia, leukodystrophy | FA2H knockout mice, patient-derived fibroblasts |
| FA2H | Breast cancer metastasis | MDA-MB-231 cells with FA2H overexpression or knockout |
| FA2H | Rotavirus infection | FA2H knockout cell lines, viral entry assays |
| FA2H | Skin barrier defects | Keratinocyte differentiation models, FA2H knockdown |
| FA2H | Myelin abnormalities | FA2H-null mouse brain lipidomics |
Neurodegenerative disorders
Mutations in FA2H cause a spectrum of neurodegenerative diseases, including spastic paraplegia and leukodystrophy. Patient cells show altered 2-hydroxy sphingomyelin profiles, indicating that loss of GO:0080132 activity disrupts myelin maintenance. Mouse models with FA2H deficiency exhibit myelin abnormalities and motor deficits.
Cancer
FA2H promotes breast cancer cell migration, suggesting a role in metastasis. In MDA-MB-231 cells, FA2H expression is regulated by PPARα and cannabinoids, and its upregulation enhances migratory capacity. Thus, GO:0080132 may contribute to cancer progression.
Skin barrier defects
FA2H is required for the production of 2-hydroxy ceramides in the epidermis. Reduced FA2H activity leads to impaired skin barrier function, as seen in keratinocyte differentiation models.
Infectious disease
FA2H facilitates rotavirus uncoating and endosomal escape, highlighting a role for GO:0080132 in viral entry. Inhibiting this activity may reduce rotavirus infectivity.
From fatty acid 2-hydroxylase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does FA2H loss affect 2-hydroxy sphingolipid levels? | FA2H knockout cell line (e.g., HeLa, HEK293) |
| What is the role of FA2H in myelin maintenance? | FA2H knockout mouse |
| How does FA2H mutation affect enzyme activity? | Point mutation knock-in (e.g., patient mutations) |
| Can FA2H overexpression enhance cancer cell migration? | FA2H overexpression in MDA-MB-231 cells |
| Does PPARα regulate FA2H transcription? | PPARα knockout or agonist treatment in breast cancer cells |
| Is FA2H required for rotavirus entry? | FA2H knockout intestinal epithelial cells |
How to Study the fatty acid 2-hydroxylase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| GC-MS enzyme assay | 2-hydroxylase activity in vitro | Kinetic studies, inhibitor testing |
| Lipidomics (LC-MS) | 2-hydroxy sphingolipid levels | Profiling patient cells, knockout models |
| qRT-PCR | FA2H mRNA expression | Differentiation studies, drug treatment |
| RNA-seq | Transcriptome-wide changes | Identifying pathways co-regulated with FA2H |
| CRISPR knockout screen | Genes required for viral entry | Host factor identification |
| Western blot | FA2H protein levels | Validating expression changes |
| Immunofluorescence | Subcellular localization | Determining ER localization |
| Migration assay | Cell migration capacity | Assessing FA2H role in cancer |
Enzyme activity assays
Fatty acid 2-hydroxylase activity can be measured in vitro using a GC-MS-based method that detects the conversion of deuterated palmitic acid to 2-hydroxy palmitic acid. This assay is sensitive and allows quantification of enzyme kinetics.
Lipidomics
Mass spectrometry-based lipidomics enables profiling of 2-hydroxy sphingolipids, such as 2-hydroxy ceramides and 2-hydroxy sphingomyelin, in cells and tissues. This approach has been used to show altered profiles in FA2H-mutant patient cells.
Gene expression analysis
Quantitative RT-PCR and RNA-seq can measure FA2H mRNA levels during differentiation or in response to stimuli. For example, FA2H expression increases during keratinocyte differentiation and in postnatal brain.
CRISPR-based screens
Genome-wide CRISPR knockout screens can identify genes required for 2-hydroxy sphingolipid synthesis or viral entry. Such screens have implicated FA2H in rotavirus infection.
How CRISPR Can Be Used to Study GO:0080132 fatty acid 2-hydroxylase activity
Knockout
CRISPR-Cas9 knockout of FA2H eliminates fatty acid 2-hydroxylase activity, leading to loss of 2-hydroxy sphingolipids. This model is useful for studying the consequences of GO:0080132 deficiency in cell lines and animal models.
Point Mutation
Introducing patient-specific point mutations into FA2H via CRISPR can recapitulate loss-of-function or hypomorphic alleles. These models help determine how specific mutations affect enzyme activity and sphingolipid profiles.
Knock-in
Knock-in of tagged FA2H (e.g., FLAG or GFP) allows visualization and purification of the enzyme. This approach can reveal subcellular localization and interaction partners.
Overexpression
CRISPR activation or lentiviral overexpression of FA2H increases 2-hydroxylase activity and 2-hydroxy sphingolipid production. This is useful for gain-of-function studies, such as assessing effects on cancer cell migration.
How EDITGENE Supports fatty acid 2-hydroxylase activity Research
Researchers studying fatty acid 2-hydroxylase activity-related genes often need to determine whether a candidate gene is causally involved in 2-hydroxy sphingolipid synthesis, myelin maintenance, or cancer progression. EDITGENE provides comprehensive CRISPR-based services to create precise cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for fatty acid 2-hydroxylase activity research.
Frequently Asked Questions About fatty acid 2-hydroxylase activity
What is fatty acid 2-hydroxylase activity?
It is the enzymatic activity that adds a hydroxyl group to the C-2 position of fatty acids, either free or in sphingolipids, encoded by GO:0080132.
What genes are involved in fatty acid 2-hydroxylase activity?
The primary gene is FA2H, which encodes the enzyme. Other genes such as PPARA regulate its expression.
What is the GO ID for fatty acid 2-hydroxylase activity?
The GO ID is GO:0080132.
Which diseases are linked to fatty acid 2-hydroxylase activity?
Mutations in FA2H cause neurodegenerative disorders like spastic paraplegia, and altered activity is linked to breast cancer and skin barrier defects.
How is fatty acid 2-hydroxylase activity measured?
It can be measured using a GC-MS-based enzyme assay that detects 2-hydroxy fatty acid production.
What are the substrates of fatty acid 2-hydroxylase?
Free fatty acids and fatty acyl chains of sphingolipids serve as substrates.
Where is fatty acid 2-hydroxylase located in the cell?
It is localized to the endoplasmic reticulum membrane.
Can fatty acid 2-hydroxylase activity be regulated?
Yes, FA2H expression is regulated by PPARα and during keratinocyte differentiation.
What is the role of FA2H in cancer?
FA2H promotes breast cancer cell migration and is regulated by cannabinoids via PPARα.
How can CRISPR be used to study fatty acid 2-hydroxylase activity?
CRISPR knockout, knock-in, or overexpression of FA2H allows precise manipulation of the activity in cell models.
Conclusion
Fatty acid 2-hydroxylase activity (GO:0080132) is a critical enzymatic function for the synthesis of 2-hydroxy sphingolipids, which are essential for myelin and skin barrier integrity. Its dysregulation is linked to neurodegenerative diseases, cancer, and viral infections. Understanding this activity through biochemical assays, lipidomics, and CRISPR models will continue to reveal its roles in health and disease. EDITGENE offers comprehensive CRISPR services to facilitate such research.
References
- 1. Li E et al.. 2025. Fatty acid 2-hydroxylase facilitates rotavirus uncoating and endosomal escape.. Proc Natl Acad Sci U S A 122(36):e2511911122 PMID: 40901882
- 2. Hirao-Suzuki M et al.. 2020. Fatty acid 2-hydroxylase (FA2H) as a stimulatory molecule responsible for breast cancer cell migration.. Biochem Biophys Res Commun 531(2):215-222 PMID: 32798015
- 3. Alderson NL et al.. 2004. The human FA2H gene encodes a fatty acid 2-hydroxylase.. J Biol Chem 279(47):48562-8 PMID: 15337768
- 4. Uchida Y et al.. 2007. Fatty acid 2-hydroxylase, encoded by FA2H, accounts for differentiation-associated increase in 2-OH ceramides during keratinocyte differentiation.. J Biol Chem 282(18):13211-9 PMID: 17355976
- 5. Hirao-Suzuki M et al.. 2019. Δ(9)-Tetrahydrocannabinol upregulates fatty acid 2-hydroxylase (FA2H) via PPARα induction: A possible evidence for the cancellation of PPARβ/δ-mediated inhibition of PPARα in MDA-MB-231 cells.. Arch Biochem Biophys 662:219-225 PMID: 30553767
- 6. Alderson NL et al.. 2006. FA2H-dependent fatty acid 2-hydroxylation in postnatal mouse brain.. J Lipid Res 47(12):2772-80 PMID: 16998236
- 7. Alderson NL et al.. 2005. A novel method for the measurement of in vitro fatty acid 2-hydroxylase activity by gas chromatography-mass spectrometry.. J Lipid Res 46(7):1569-75 PMID: 15863841
- 8. Dan P et al.. 2011. 2-Hydroxylated sphingomyelin profiles in cells from patients with mutated fatty acid 2-hydroxylase.. Lipids Health Dis 10:84 PMID: 21599921
