GO:0106359 2-hydroxyacyl-CoA lyase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0106359 (2-hydroxyacyl-CoA lyase activity) is a molecular function that catalyzes the cleavage of a 2-hydroxy fatty acyl-CoA into a fatty aldehyde and formyl-CoA.
• The enzyme is thiamine pyrophosphate (TPP)-dependent and is best characterized in peroxisomal fatty acid metabolism, where it processes 3-methyl-branched and 2-hydroxy straight-chain fatty acyl-CoAs.
• HACL1 (2-hydroxyacyl-CoA lyase 1) is the principal mammalian gene associated with this activity, and its deficiency alters peroxisomal and omega-oxidation pathways in mice.
• Bacterial homologs, such as the actinobacterial 2-hydroxyisobutyryl-CoA lyase, provide mechanistic insight into substrate accommodation and catalytic tradeoffs.
• The reaction is mechanistically related to acyloin condensation and one-carbon bioconversion, linking this activity to metabolic engineering applications.
• Studying GO:0106359 requires combining genetic models (knockout, point mutation, knock-in, overexpression) with proteomics, metabolomics, and enzyme assays.
Description
2-hydroxyacyl-CoA lyase activity (GO:0106359) is a molecular function defined by the reaction in which a 2-hydroxy fatty acyl-CoA is converted into a fatty aldehyde and formyl-CoA. This activity is central to the peroxisomal degradation of 3-methyl-branched fatty acids and 2-hydroxy straight-chain fatty acids, a pathway that is distinct from classical beta-oxidation. The enzyme responsible, 2-hydroxyacyl-CoA lyase 1 (HACL1), is a thiamine pyrophosphate (TPP)-dependent protein, and its catalytic mechanism has been studied in both mammalian and bacterial systems. Because the reaction produces formyl-CoA, it intersects with one-carbon metabolism and has attracted interest for bioconversion applications. In bacteria, related lyases participate in the degradation of 2-hydroxyisobutyryl-CoA and other 2-hydroxyacyl-CoA substrates, revealing conserved mechanistic features. For researchers, GO:0106359 provides a precise functional annotation that can be used to interpret genomic, proteomic, and metabolic datasets, and to design experiments that test the role of this activity in health and disease.
2-hydroxyacyl-CoA lyase activity At A Glance
| GO ID | GO:0106359 |
|---|---|
| GO term | 2-hydroxyacyl-CoA lyase activity |
| Ontology | molecular_function |
| Synonym | (none) |
| Major function | Catalysis of the reaction: a 2-hydroxy fatty acyl-CoA = a fatty aldehyde + formyl-CoA |
| Substrate specificity | Acts on 2-hydroxy-3-methyl-branched fatty acyl-CoA and 2-hydroxy-long-chain fatty acyl-CoA |
| Cofactor | Thiamine pyrophosphate (TPP)-dependent |
| Cellular context | Peroxisomal metabolism in mammals |
| Related processes | Fatty acid alpha-oxidation, one-carbon bioconversion, acyloin condensation |
What Is GO:0106359?
In simple terms, GO:0106359 describes an enzyme activity that cuts a specific type of fatty acid derivative into two smaller molecules. According to the QuickGO definition, it catalyzes the reaction: a 2-hydroxy fatty acyl-CoA = a fatty aldehyde + formyl-CoA. The reaction acts on 2-hydroxy-3-methyl-branched fatty acyl-CoA and 2-hydroxy-long-chain fatty acyl-CoA. This activity is therefore a carbon-carbon cleavage reaction that requires a 2-hydroxy group on the acyl chain and produces an aldehyde plus formyl-CoA.
Why Is 2-hydroxyacyl-CoA lyase activity Important in Cell Biology?
GO:0106359 is important because it defines a unique enzymatic step in fatty acid metabolism that is not covered by classical beta-oxidation. The reaction catalyzed by 2-hydroxyacyl-CoA lyase is essential for the peroxisomal breakdown of 3-methyl-branched fatty acids, such as phytanic acid derivatives, and for 2-hydroxy straight-chain fatty acids. Defects in this pathway can lead to accumulation of potentially toxic intermediates, and mouse models of HACL1 deficiency show peroxisome proliferation and activation of omega-oxidation, indicating a broader metabolic rewiring. In bacteria, homologous lyases are involved in the degradation of 2-hydroxyisobutyryl-CoA and related compounds, and mechanistic studies have revealed how substrate accommodation affects reaction rate. The activity also produces formyl-CoA, which can feed into one-carbon metabolism, making it relevant for metabolic engineering and bioconversion strategies. Thus, GO:0106359 is a key annotation for understanding peroxisomal disorders, bacterial metabolism, and synthetic biology applications.
• Provides a specific functional annotation for genes involved in peroxisomal fatty acid alpha-oxidation.
• Links to inherited disorders of peroxisomal metabolism, including conditions with accumulation of 3-methyl-branched fatty acids.
• HACL1 deficiency in mice causes peroxisome proliferation and activation of omega-oxidation, revealing compensatory pathways.
• Bacterial homologs are studied for their role in anaerobic amino acid fermentation and 2-hydroxyacyl-CoA dehydration.
• The reaction produces formyl-CoA, connecting this activity to one-carbon metabolism and bioconversion.
• Mechanistic studies of actinobacterial lyases inform on TPP-dependent catalysis and substrate specificity.
• The activity is a potential target for metabolic engineering of value-added chemicals from fatty acids.
• Understanding GO:0106359 helps interpret omics data in peroxisomal disease models and bacterial systems.
• It is distinct from radical-based 2-hydroxyacyl-CoA dehydratases, highlighting mechanistic diversity in anaerobic metabolism.
• Assays for this activity can be used to screen for inhibitors or to characterize mutant enzymes.
Mechanism, Genes and Research Methods
Substrate Recognition and Binding
In simple terms: The enzyme must first grab the right fatty acid molecule before it can cut it.
2-hydroxyacyl-CoA lyase activity acts on 2-hydroxy-3-methyl-branched fatty acyl-CoA and 2-hydroxy-long-chain fatty acyl-CoA. The enzyme recognizes the 2-hydroxy group and the CoA moiety, which positions the substrate for cleavage. In mammalian peroxisomes, HACL1 is the enzyme responsible for this activity, and its substrate specificity has been studied using synthetic substrates and enzyme assays. Bacterial homologs, such as the actinobacterial 2-hydroxyisobutyryl-CoA lyase, show similar substrate recognition but with variations that affect catalytic efficiency.
Thiamine Pyrophosphate-Dependent Catalysis
In simple terms: A vitamin-derived helper molecule (TPP) is needed for the chemical reaction to occur.
The lyase reaction is thiamine pyrophosphate (TPP)-dependent. TPP binds to the enzyme and facilitates the cleavage of the carbon-carbon bond in the 2-hydroxyacyl-CoA substrate. Studies on HACL1 have shown that TPP is required for oligomerization, functioning, and import of the peroxisomal enzyme. In bacterial lyases, mechanistic details of TPP-dependent degradation of 2-hydroxyisobutyryl-CoA have been elucidated, including the role of a conserved glutamate in protonating the C2alpha-carbanion intermediate.
Formation of Fatty Aldehyde and Formyl-CoA
In simple terms: The cutting reaction produces two products: a fatty aldehyde and formyl-CoA.
The catalytic cleavage of 2-hydroxyacyl-CoA yields a fatty aldehyde and formyl-CoA. This reaction is formally a lyase, as it breaks a carbon-carbon bond without hydrolysis. The fatty aldehyde product can be further metabolized, while formyl-CoA can enter one-carbon pools. In vitro, the activity can be measured by detecting formyl-CoA or the aldehyde product using chromatographic or spectrophotometric methods. The reaction is also related to acyloin condensation, where the enzyme can catalyze the reverse or alternative condensation, which has implications for bioconversion.
Peroxisomal Localization and Import
In simple terms: In mammalian cells, this enzyme works inside peroxisomes, so it must be imported there.
HACL1 is a peroxisomal enzyme, and its import into peroxisomes depends on TPP binding and proper folding. The peroxisomal localization places the activity in the context of fatty acid alpha-oxidation and the degradation of 3-methyl-branched fatty acids. Deficiency of HACL1 in mice leads to peroxisome proliferation and activation of omega-oxidation, suggesting that the peroxisomal compartment responds to loss of this activity. The import mechanism and oligomerization state of HACL1 have been studied using cell biology and biochemical approaches.
Bacterial Homologs and Mechanistic Diversity
In simple terms: Bacteria have similar enzymes that help them break down unusual fatty acids.
Bacterial 2-hydroxyacyl-CoA lyases, such as the actinobacterial enzyme acting on 2-hydroxyisobutyryl-CoA, share mechanistic features with mammalian HACL1 but exhibit differences in substrate range and reaction rate. These enzymes are involved in the degradation of 2-hydroxyisobutyryl-CoA, a product of valine metabolism or industrial chemicals. In anaerobic bacteria, 2-hydroxyacyl-CoA dehydratases catalyze a different reaction, dehydration to enoyl-CoA, which is a radical-based mechanism. The existence of both lyase and dehydratase activities for 2-hydroxyacyl-CoA substrates highlights the metabolic diversity of this compound class.
Key Genes Involved in GO:0106359 2-hydroxyacyl-CoA lyase activity
The following genes and proteins are directly or mechanistically linked to 2-hydroxyacyl-CoA lyase activity (GO:0106359) based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HACL1 | Mammalian 2-hydroxyacyl-CoA lyase 1; catalyzes the cleavage of 2-hydroxyacyl-CoA to fatty aldehyde and formyl-CoA | Central enzyme for GO:0106359; knockout mice show peroxisome proliferation |
| HACL2 | Homolog of HACL1 with possible similar lyase activity | Candidate for redundant or tissue-specific functions |
| PHYH | Phytanoyl-CoA 2-hydroxylase; generates 2-hydroxyacyl-CoA for HACL1 | Upstream of HACL1 in alpha-oxidation |
| ACOX1 | Acyl-CoA oxidase 1; involved in peroxisomal beta-oxidation | May compensate in HACL1 deficiency |
| CYP4A | Cytochrome P450 omega-oxidation enzymes | Induced in HACL1-deficient mice |
| i6A | Actinobacterial 2-hydroxyisobutyryl-CoA lyase | Model for TPP-dependent lyase mechanism |
| HadI | 2-hydroxyacyl-CoA dehydratase from anaerobic bacteria | Related but distinct activity |
| Bcd | Butyryl-CoA dehydrogenase | Potential downstream of lyase products |
| Pex5 | Peroxisomal import receptor | Required for HACL1 import |
| Pex7 | Peroxisomal import receptor | May affect HACL1 localization |
| Thiamine transporter genes | TPP uptake and metabolism | Cofactor availability affects HACL1 function |
| ALDH | Aldehyde dehydrogenases | Metabolize fatty aldehyde product |
| ACSL | Acyl-CoA synthetases | Generate acyl-CoA substrates |
| CPT1 | Carnitine palmitoyltransferase 1 | Fatty acid transport, indirect |
| PPARalpha | Peroxisome proliferator-activated receptor alpha | Regulates peroxisomal genes including HACL1 |
| SLC25A17 | Peroxisomal CoA transporter | Supplies CoA for reactions |
| ETFA | Electron transfer flavoprotein | Linked to peroxisomal metabolism |
How Is 2-hydroxyacyl-CoA lyase activity Regulated?
The expression and activity of 2-hydroxyacyl-CoA lyase are regulated at multiple levels. In mammals, HACL1 is a peroxisomal enzyme whose import and function depend on TPP binding; TPP deficiency or mutations affecting TPP binding can impair oligomerization and import. Peroxisome proliferator-activated receptor alpha (PPARalpha) regulates peroxisomal fatty acid oxidation genes, and HACL1 deficiency in mice leads to peroxisome proliferation and activation of omega-oxidation, suggesting feedback regulation. In bacteria, the expression of 2-hydroxyacyl-CoA lyases is likely controlled by substrate availability and global metabolic regulators, though specific regulators are not fully defined. The reaction rate can be influenced by substrate accommodation, as shown by mechanistic studies on actinobacterial lyase mutants.
2-hydroxyacyl-CoA lyase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HACL1 | Peroxisomal fatty acid oxidation disorder; accumulation of 3-methyl-branched fatty acids | HACL1 knockout mouse; patient-derived fibroblasts |
| HACL1 | Peroxisome proliferation and omega-oxidation activation | HACL1-/- mouse proteomics |
| PHYH | Refsum disease (phytanic acid accumulation) | PHYH mutant cell lines |
| i6A | Bacterial 2-hydroxyisobutyryl-CoA metabolism | Actinobacterial knockout and point mutants |
| HadI | Anaerobic amino acid fermentation | Bacterial deletion strains |
Peroxisomal Disorders and Fatty Acid Metabolism
2-hydroxyacyl-CoA lyase activity is part of the peroxisomal alpha-oxidation pathway that degrades 3-methyl-branched fatty acids, such as phytanic acid. Defects in this pathway can lead to accumulation of phytanic acid and related metabolites, which are associated with neurological and metabolic disorders. HACL1-deficient mice display peroxisome proliferation and activation of omega-oxidation, indicating that loss of this activity triggers compensatory metabolic changes. These findings suggest that HACL1 could be relevant to peroxisomal disease phenotypes, although direct human mutations are not extensively characterized in the provided literature.
Metabolic Rewiring and Oxidative Stress
The absence of HACL1 in mice leads to peroxisome proliferation and increased omega-oxidation, which may reflect an attempt to compensate for impaired alpha-oxidation. This metabolic rewiring could influence oxidative stress and lipid homeostasis. The proteome of HACL1-deficient mice shows changes in peroxisomal and omega-oxidation proteins, providing a resource for understanding how cells respond to loss of this activity. Such compensatory mechanisms may be relevant to diseases involving lipid accumulation and peroxisomal dysfunction.
Bacterial Pathogenesis and Metabolism
Bacterial 2-hydroxyacyl-CoA lyases are involved in the degradation of 2-hydroxyisobutyryl-CoA, a metabolite derived from valine or environmental sources. In anaerobic bacteria, related 2-hydroxyacyl-CoA dehydratases participate in amino acid fermentation, which can be important for pathogen survival in the gut. While not directly linked to a specific human disease in the provided literature, these bacterial pathways are potential targets for antimicrobial development and are relevant to microbiome metabolism.
From 2-hydroxyacyl-CoA lyase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of HACL1 affect peroxisomal metabolism? | HACL1 knockout mouse or cell line |
| What is the role of TPP binding in HACL1 import? | Point mutations in TPP-binding residues |
| Can HACL1 be redirected to new substrates? | Knock-in of mutant HACL1 variants |
| Where is HACL1 localized in cells? | Tagged knock-in with fluorescent protein |
| Does overexpression of HACL1 enhance alpha-oxidation? | Overexpression cell models |
| How do bacterial lyases differ in substrate specificity? | Bacterial knockout and point mutation libraries |
How to Study the 2-hydroxyacyl-CoA lyase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS | Substrate and product levels | Enzyme kinetics and metabolomics |
| HPLC | Formyl-CoA or aldehyde production | Activity assays |
| Proteomics | Protein expression changes | HACL1 knockout mouse tissues |
| Fluorescence microscopy | Subcellular localization | Peroxisomal import studies |
| CRISPR knockout | Gene function loss | Phenotypic screens |
| Site-directed mutagenesis | Enzyme mechanism | TPP-binding and catalytic residues |
| Western blot | Protein expression and oligomerization | HACL1 stability and import |
| RNA-seq | Transcriptional changes | Pathway regulation |
Enzyme Activity Assays
Direct measurement of 2-hydroxyacyl-CoA lyase activity can be performed using synthetic 2-hydroxyacyl-CoA substrates and detecting the formation of fatty aldehyde or formyl-CoA by HPLC, LC-MS, or spectrophotometric assays. These assays are essential for characterizing wild-type and mutant enzymes and for testing inhibitors.
Proteomics and Metabolomics
Proteomic analysis of HACL1-deficient mouse tissues has revealed peroxisome proliferation and activation of omega-oxidation, providing a systems-level view of metabolic rewiring. Metabolomics can quantify substrates and products of the lyase reaction, such as 2-hydroxy fatty acids and fatty aldehydes, in cells and tissues.
Cell Imaging and Localization
Fluorescence microscopy of tagged HACL1 can determine its peroxisomal localization and import dynamics. Co-localization with peroxisomal markers and TPP-dependent import can be studied using fixed and live-cell imaging.
Genetic and CRISPR Screens
CRISPR knockout screens can identify genes that modify the phenotype of HACL1 deficiency or that are required for lyase activity. Overexpression and point mutation models allow structure-function studies of the enzyme in its cellular context.
How CRISPR Can Be Used to Study GO:0106359 2-hydroxyacyl-CoA lyase activity
Knockout
CRISPR knockout of HACL1 in cell lines or mice can model loss of 2-hydroxyacyl-CoA lyase activity. HACL1-deficient mice show peroxisome proliferation and activation of omega-oxidation, providing a valuable model for studying compensatory pathways. Knockout cell lines can be used to test substrate accumulation and sensitivity to fatty acid stress.
Point Mutation
Point mutations in HACL1, such as those affecting TPP binding or catalytic residues, can be introduced using CRISPR to dissect the mechanism of lyase activity and its role in peroxisomal import. Bacterial lyase point mutants have revealed tradeoffs between substrate accommodation and reaction rate.
Knock-in
Knock-in of tagged HACL1 (e.g., GFP or FLAG) allows visualization and purification of the enzyme for localization and interaction studies. Knock-in of disease-associated variants can model their effects on enzyme function and cellular metabolism.
Overexpression
Overexpression of HACL1 or bacterial lyases in cell models can enhance the flux through the lyase reaction, enabling metabolic engineering and bioconversion studies. Overexpression can also be used to test gain-of-function phenotypes and substrate specificity in vivo.
How EDITGENE Supports 2-hydroxyacyl-CoA lyase activity Research
Researchers studying 2-hydroxyacyl-CoA lyase activity-related genes often need to determine whether a candidate gene is causally involved in the metabolic pathway, and CRISPR-based models provide a precise way to test this. By combining knockout, point mutation, knock-in, and overexpression strategies, it is possible to dissect the enzymatic mechanism, regulation, and disease relevance of GO:0106359.
Contact EDITGENE today to design your custom CRISPR model for 2-hydroxyacyl-CoA lyase activity research.
Frequently Asked Questions About 2-hydroxyacyl-CoA lyase activity
What is 2-hydroxyacyl-CoA lyase activity?
It is a molecular function (GO:0106359) that catalyzes the reaction: a 2-hydroxy fatty acyl-CoA = a fatty aldehyde + formyl-CoA, acting on 2-hydroxy-3-methyl-branched and 2-hydroxy-long-chain fatty acyl-CoAs.
What genes are involved in 2-hydroxyacyl-CoA lyase activity?
The main mammalian gene is HACL1, which encodes a peroxisomal TPP-dependent lyase. Bacterial homologs include the actinobacterial 2-hydroxyisobutyryl-CoA lyase.
What is the function of HACL1?
HACL1 catalyzes the cleavage of 2-hydroxyacyl-CoA to fatty aldehyde and formyl-CoA in peroxisomes, playing a role in alpha-oxidation of 3-methyl-branched fatty acids.
What diseases are associated with 2-hydroxyacyl-CoA lyase deficiency?
HACL1 deficiency in mice causes peroxisome proliferation and activation of omega-oxidation; in humans, defects in peroxisomal alpha-oxidation can lead to accumulation of phytanic acid and related disorders.
How is 2-hydroxyacyl-CoA lyase activity measured?
It can be measured using LC-MS or HPLC to detect the fatty aldehyde or formyl-CoA products from synthetic 2-hydroxyacyl-CoA substrates.
Is 2-hydroxyacyl-CoA lyase dependent on thiamine?
Yes, the enzyme is thiamine pyrophosphate (TPP)-dependent, and TPP binding is required for its function and peroxisomal import.
What is the difference between 2-hydroxyacyl-CoA lyase and dehydratase?
Lyase cleaves 2-hydroxyacyl-CoA to aldehyde and formyl-CoA, while dehydratase removes water to form enoyl-CoA; they are distinct activities.
Can 2-hydroxyacyl-CoA lyase be used for bioconversion?
Yes, the enzyme can catalyze acyloin condensation for one-carbon bioconversion, making it useful for metabolic engineering.
What model systems are used to study 2-hydroxyacyl-CoA lyase?
HACL1 knockout mice, cell lines, and bacterial mutants are commonly used, along with CRISPR point mutation and overexpression models.
Where is 2-hydroxyacyl-CoA lyase located in the cell?
In mammals, HACL1 is localized to peroxisomes, where it participates in fatty acid alpha-oxidation.
Conclusion
GO:0106359 (2-hydroxyacyl-CoA lyase activity) defines a unique TPP-dependent carbon-carbon cleavage reaction that is essential for peroxisomal fatty acid metabolism and has parallels in bacterial degradation pathways. The mammalian enzyme HACL1 is the best-characterized representative, and its deficiency leads to peroxisome proliferation and metabolic rewiring. Bacterial homologs provide mechanistic insights into substrate accommodation and catalysis. Studying this activity with CRISPR models, enzyme assays, and omics approaches will continue to reveal its roles in health, disease, and biotechnology.
References
- 1. Chou A et al.. 2019. 2-Hydroxyacyl-CoA lyase catalyzes acyloin condensation for one-carbon bioconversion.. Nat Chem Biol 15(9):900-906 PMID: 31383974
- 2. Khalil Y et al.. 2022. Tissue Proteome of 2-Hydroxyacyl-CoA Lyase Deficient Mice Reveals Peroxisome Proliferation and Activation of ω-Oxidation.. Int J Mol Sci 23(2) PMID: 35055171
- 3. Kim J et al.. 2004. Dehydration of (R)-2-hydroxyacyl-CoA to enoyl-CoA in the fermentation of alpha-amino acids by anaerobic bacteria.. FEMS Microbiol Rev 28(4):455-68 PMID: 15374661
- 4. Zahn M et al.. 2022. Mechanistic details of the actinobacterial lyase-catalyzed degradation reaction of 2-hydroxyisobutyryl-CoA.. J Biol Chem 298(1):101522 PMID: 34952003
- 5. Casteels M et al.. 2007. The role of 2-hydroxyacyl-CoA lyase, a thiamin pyrophosphate-dependent enzyme, in the peroxisomal metabolism of 3-methyl-branched fatty acids and 2-hydroxy straight-chain fatty acids.. Biochem Soc Trans 35(Pt 5):876-80 PMID: 17956236
- 6. Zahn M et al.. 2026. C2α-carbanion-protonating glutamate discloses tradeoffs between substrate accommodation and reaction rate in actinobacterial 2-hydroxyacyl-CoA lyase.. FEBS Open Bio 16(7):1314-1327 PMID: 41606311
- 7. Fraccascia P et al.. 2011. Role of thiamine pyrophosphate in oligomerisation, functioning and import of peroxisomal 2-hydroxyacyl-CoA lyase.. Biochim Biophys Acta 1814(10):1226-33 PMID: 21708296
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