GO:0033989 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0033989 describes the molecular function of a hydro-lyase that converts (24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestanoyl-CoA to (24E)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA plus water.
• This activity is a late step in peroxisomal beta-oxidation of bile acid intermediates, specifically the side-chain shortening of cholestanoyl-CoA derivatives.
• The enzyme belongs to the short-chain alcohol dehydrogenase/reductase superfamily and is known as 46 kDa hydratase 2 or D-3-hydroxyacyl-CoA dehydratase.
• The human gene encoding this multifunctional enzyme is HSD17B4 (peroxisomal multifunctional enzyme type 2, MFE-2), which contains both hydratase and dehydrogenase domains.
• Defects in peroxisomal beta-oxidation, including this hydratase step, are linked to D-bifunctional protein deficiency and related peroxisomal disorders.
• Studying GO:0033989 requires combining substrate-specific enzyme assays, gene expression analysis, and CRISPR-based models to dissect its role in bile acid synthesis and peroxisomal metabolism.
Description
GO:0033989, 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity, is a molecular function annotation that captures a specific hydro-lyase reaction in peroxisomal bile acid biosynthesis. The reaction interconverts a 24-hydroxy cholestanoyl-CoA and a 24,25-unsaturated cholest-24-enoyl-CoA, releasing water, and is catalyzed by the hydratase domain of peroxisomal multifunctional enzyme type 2 (MFE-2), encoded by HSD17B4 in humans. This step is part of the beta-oxidation spiral that shortens the side chain of bile acid intermediates before they are conjugated and exported. For researchers, GO:0033989 is important because it provides a precise functional handle on a metabolic node that connects peroxisomal fatty acid oxidation, bile acid synthesis, and steroid metabolism. The same enzyme also displays D-3-hydroxyacyl-CoA dehydratase activity toward other substrates, making substrate specificity and domain organization central to understanding its physiological roles. Because peroxisomal beta-oxidation defects cause severe neurological and hepatic disease, this activity is a relevant target for mechanistic studies and for interpreting variants in HSD17B4. This article summarizes the QuickGO definition, the catalytic and structural context of the enzyme, the genes and pathways involved, and the experimental methods, including CRISPR-based models, that can be used to study GO:0033989 in human cells and animal models.
3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity At A Glance
| GO ID | GO:0033989 |
|---|---|
| GO term | 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity |
| Ontology | molecular_function |
| Synonym | (24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestanoyl-CoA hydro-lyase activity; 46 kDa hydratase 2 activity; D-3-hydroxyacyl-CoA dehydratase activity |
| Major function | Catalyzes the reversible dehydration of a 24-hydroxy cholestanoyl-CoA to a 24,25-unsaturated cholest-24-enoyl-CoA in peroxisomal bile acid side-chain beta-oxidation |
| Enzyme class | Hydro-lyase (dehydratase) acting on CoA derivatives |
| Subcellular location | Peroxisome (peroxisomal multifunctional enzyme type 2) |
| Representative gene | HSD17B4 (human MFE-2) |
| Related activity | D-3-hydroxyacyl-CoA dehydratase activity toward other hydroxyacyl-CoA substrates |
What Is GO:0033989?
GO:0033989 is defined as the catalysis of the reaction: (24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestanoyl-CoA = (24E)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA + H2O. In other words, it is a hydro-lyase (dehydratase) activity that removes water from a hydroxylated cholestanoyl-CoA to form a double bond in the side chain, using the peroxisomal multifunctional enzyme type 2 (MFE-2) hydratase domain. The term is a molecular_function annotation and is synonymous with (24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestanoyl-CoA hydro-lyase activity, 46 kDa hydratase 2 activity, and D-3-hydroxyacyl-CoA dehydratase activity.
Why Is 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity Important in Cell Biology?
GO:0033989 is important because it marks a specific catalytic step in peroxisomal beta-oxidation of bile acid intermediates, a pathway that is essential for normal bile acid synthesis and for preventing the accumulation of toxic cholestanoyl-CoA derivatives. The enzyme responsible, MFE-2/HSD17B4, is a multifunctional protein with both hydratase and dehydrogenase domains, and its activity is required for the side-chain shortening of C27 bile acid precursors before they are converted to mature C24 bile acids. Because peroxisomal beta-oxidation defects cause severe diseases such as D-bifunctional protein deficiency, understanding this hydratase activity helps interpret disease variants and design experiments that test metabolic flux through the bile acid synthesis pathway. In addition, the same enzyme can act on other hydroxyacyl-CoA substrates, so defining the substrate specificity of GO:0033989 is key to distinguishing its role in bile acid synthesis from its broader role in peroxisomal lipid metabolism.
• It is a required step in peroxisomal beta-oxidation of bile acid intermediates, enabling side-chain shortening of cholestanoyl-CoA.
• It is catalyzed by the hydratase domain of peroxisomal multifunctional enzyme type 2 (MFE-2/HSD17B4), a protein with dual hydratase and dehydrogenase activities.
• Loss of peroxisomal beta-oxidation, including this activity, is associated with severe peroxisomal disorders such as D-bifunctional protein deficiency.
• The enzyme also exhibits D-3-hydroxyacyl-CoA dehydratase activity, linking GO:0033989 to broader peroxisomal fatty acid oxidation.
• Substrate specificity studies are needed to distinguish bile acid intermediate processing from other hydroxyacyl-CoA substrates.
• The reaction is reversible in vitro, which is relevant for enzyme assay design and for interpreting metabolic flux in cells.
• HSD17B4 variants can affect both hydratase and dehydrogenase domains, so functional annotation of GO:0033989 helps variant interpretation.
• Studying this activity supports research on bile acid synthesis, cholestasis, and peroxisome biology.
• It provides a molecular target for CRISPR knockout or point-mutation models to test pathway causality.
• It is a useful annotation for multi-omics integration, linking transcriptomics of HSD17B4 to peroxisomal metabolic phenotypes.
Molecular Mechanism of 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity
Substrate recognition and binding
In simple terms: The enzyme grabs a specific bile acid intermediate and holds it in place for a chemical reaction.
The hydratase domain of peroxisomal multifunctional enzyme type 2 (MFE-2) recognizes (24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestanoyl-CoA as a substrate, positioning the 24-hydroxy group and the CoA thioester for catalysis. Substrate specificity studies of peroxisomal short-chain alcohol dehydrogenase superfamily members show that the enzyme can also act on related hydroxyacyl-CoA substrates, which is why the same protein is annotated with D-3-hydroxyacyl-CoA dehydratase activity. The CoA moiety anchors the substrate in the active site, while the steroid nucleus and side chain determine whether the substrate is efficiently dehydrated.
Catalytic dehydration step
In simple terms: The enzyme removes a water molecule from the substrate, creating a double bond in the side chain.
GO:0033989 catalyzes the reversible dehydration of (24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestanoyl-CoA to (24E)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA plus water. This hydro-lyase reaction introduces a trans double bond at the 24,25 position of the cholestanoyl-CoA side chain, a step that prepares the molecule for further beta-oxidation rounds. The reaction is part of the peroxisomal beta-oxidation spiral that shortens the side chain of bile acid intermediates.
Domain organization of MFE-2
In simple terms: The enzyme is a two-in-one protein with a hydratase part and a dehydrogenase part.
Human MFE-2, encoded by HSD17B4, is a multifunctional enzyme that contains both a hydratase domain and a dehydrogenase domain. The hydratase domain carries GO:0033989, while the dehydrogenase domain catalyzes a subsequent oxidation step in peroxisomal beta-oxidation. The promoter region of the human MFE-2 gene has been characterized, providing insight into how expression of this bifunctional enzyme is controlled.
Role in peroxisomal beta-oxidation of bile acid intermediates
In simple terms: This reaction is one turn of a molecular assembly line that shortens bile acid precursors.
In peroxisomes, beta-oxidation of bile acid intermediates proceeds through multiple rounds of hydration, dehydrogenation, and thiolytic cleavage. GO:0033989 represents the hydratase step that acts on a 24-hydroxy cholestanoyl-CoA, generating a 24,25-unsaturated intermediate that can be further processed. Because the same enzyme also displays D-3-hydroxyacyl-CoA dehydratase activity, its role extends to other hydroxyacyl-CoA substrates in peroxisomal lipid metabolism.
Reversibility and assay considerations
In simple terms: The reaction can run in both directions in a test tube, so assays must be designed carefully.
The QuickGO definition presents the reaction as reversible, with the forward direction forming the 24,25-unsaturated product and water. Enzyme assays therefore need to control substrate and product concentrations to measure the intended direction. Substrate specificity studies of peroxisomal short-chain alcohol dehydrogenase superfamily members provide a framework for designing such assays and for comparing hydratase versus dehydrogenase activities.
Key Genes Involved in GO:0033989 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity
The genes and proteins most directly relevant to GO:0033989 include the multifunctional enzyme HSD17B4/MFE-2 and related peroxisomal beta-oxidation components that supply or process its substrates.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HSD17B4 | Encodes peroxisomal multifunctional enzyme type 2 (MFE-2) with hydratase and dehydrogenase domains; carries GO:0033989 | Primary gene for functional studies, variant interpretation, and CRISPR models of peroxisomal beta-oxidation |
| MFE-2 (protein) | Bifunctional enzyme that catalyzes the hydratase step (GO:0033989) and a subsequent dehydrogenation | Target for enzyme assays and structural studies of the hydratase domain |
| Candida tropicalis MFE | Provides a model short-chain alcohol dehydrogenase superfamily member with characterized substrate specificity | Comparative model for understanding substrate specificity of peroxisomal hydratases/dehydrogenases |
| ACOX1 | Peroxisomal acyl-CoA oxidase that initiates beta-oxidation of very-long-chain and bile acid intermediates | Upstream enzyme that generates substrates for downstream hydratase steps; useful for pathway flux studies |
| ACOX2 | Peroxisomal acyl-CoA oxidase involved in bile acid intermediate oxidation | Relevant for generating cholestanoyl-CoA substrates for GO:0033989 |
| BAAT | Bile acid-CoA:amino acid N-acyltransferase that conjugates bile acids | Downstream enzyme that uses products of bile acid side-chain shortening |
| CYP7A1 | Rate-limiting enzyme in the classical bile acid synthesis pathway | Upstream pathway gene that determines flux toward bile acid intermediates |
| CYP8B1 | Sterol 12alpha-hydroxylase that determines cholic acid versus chenodeoxycholic acid synthesis | Affects the pool of 12alpha-hydroxylated intermediates relevant to GO:0033989 |
| CYP27A1 | Sterol 27-hydroxylase in the alternative bile acid synthesis pathway | Generates 27-hydroxylated intermediates that enter peroxisomal beta-oxidation |
| SLC27A2 | Fatty acid transport protein that activates bile acid intermediates to CoA esters | Provides CoA-activated substrates for peroxisomal beta-oxidation |
| PEX5 | Peroxisomal targeting signal receptor | Required for import of MFE-2 into peroxisomes; loss affects GO:0033989 in vivo |
| PEX7 | Peroxisomal targeting signal 2 receptor | Relevant for peroxisomal protein import and MFE-2 localization |
| ABCD1 | Peroxisomal ABC transporter for very-long-chain fatty acids | Indirectly affects peroxisomal beta-oxidation flux |
| ABCD3 | Peroxisomal ABC transporter for bile acid intermediates | Directly relevant for import of substrates for peroxisomal beta-oxidation |
| HSD17B4 (dehydrogenase domain) | Catalyzes the dehydrogenase step after the hydratase reaction | Domain-specific mutations can dissect hydratase versus dehydrogenase contributions |
| SCP2 | Sterol carrier protein 2 involved in lipid transfer | May influence substrate availability for peroxisomal beta-oxidation |
| ACAA1 | Peroxisomal 3-ketoacyl-CoA thiolase | Catalyzes the thiolytic cleavage step after hydration/dehydrogenation in beta-oxidation |
| DECR2 | Peroxisomal 2,4-dienoyl-CoA reductase | Auxiliary enzyme for unsaturated fatty acid beta-oxidation that can intersect with hydratase pathways |
How Is 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity Regulated?
Expression of the human MFE-2 gene, which carries GO:0033989, is controlled at the promoter level, and the promoter region has been characterized to understand its transcriptional regulation. Because MFE-2 is a peroxisomal enzyme, its activity also depends on peroxisomal biogenesis and protein import machinery, so regulation occurs at the levels of transcription, peroxisomal import, and substrate availability. Substrate specificity studies of peroxisomal short-chain alcohol dehydrogenase superfamily members indicate that the enzyme's activity can be influenced by the availability of different hydroxyacyl-CoA substrates, providing an additional layer of metabolic regulation.
3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HSD17B4 | D-bifunctional protein deficiency; peroxisomal beta-oxidation defect | CRISPR knockout or point-mutation knock-in in human cell lines to test hydratase activity and bile acid intermediate processing |
| HSD17B4 (hydratase domain) | Impaired bile acid side-chain shortening | Domain-specific point mutations to separate hydratase from dehydrogenase functions |
| HSD17B4 (dehydrogenase domain) | Peroxisomal beta-oxidation deficiency | Knock-in of patient variants to measure domain-specific enzyme activity |
| MFE-2 promoter | Altered MFE-2 expression in metabolic disease | Reporter assays and CRISPR interference to modulate promoter activity |
| Candida tropicalis MFE | Model for substrate specificity of peroxisomal short-chain alcohol dehydrogenases | Heterologous expression and mutagenesis to map substrate-binding residues |
Peroxisomal beta-oxidation disorders
Defects in peroxisomal beta-oxidation, including the hydratase step represented by GO:0033989, are associated with severe peroxisomal disorders such as D-bifunctional protein deficiency. Because MFE-2/HSD17B4 contains both hydratase and dehydrogenase domains, loss of either domain can impair bile acid side-chain shortening and cause accumulation of toxic intermediates. Studying the promoter and expression of MFE-2 helps clarify how reduced enzyme levels contribute to disease phenotypes.
Bile acid synthesis defects and cholestasis
GO:0033989 is part of the peroxisomal beta-oxidation pathway that converts C27 bile acid intermediates to mature C24 bile acids. When this step is impaired, bile acid synthesis can be disrupted, leading to cholestasis and liver dysfunction. Functional assays for the hydratase activity are therefore relevant for diagnosing and investigating bile acid synthesis defects.
Neurological involvement in peroxisomal disease
Peroxisomal beta-oxidation defects often present with neurological symptoms, reflecting the dependence of the nervous system on peroxisomal lipid metabolism. The hydratase activity of MFE-2 contributes to this pathway, so its dysfunction can be part of the broader metabolic failure seen in peroxisomal disorders. Understanding substrate specificity and domain organization of the enzyme is important for linking molecular defects to clinical phenotypes.
From 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of HSD17B4 hydratase activity impair bile acid side-chain shortening? | HSD17B4 knockout cell line (e.g., HepG2 or HEK293) with LC-MS bile acid profiling |
| Which domain of MFE-2 carries GO:0033989? | Domain-specific point mutations in HSD17B4 (hydratase vs dehydrogenase) |
| Can a patient variant be rescued by wild-type HSD17B4? | Knock-in of the variant followed by wild-type overexpression |
| Where is MFE-2 localized in cells? | Tagged knock-in of HSD17B4 with fluorescent or epitope tag for imaging |
| Does overexpression of MFE-2 increase flux through the hydratase step? | Overexpression of HSD17B4 in a cell line with substrate loading |
| What is the substrate specificity of the hydratase domain? | Recombinant expression of MFE-2 domains and enzyme assays with different hydroxyacyl-CoA substrates |
How to Study the 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Enzyme activity assay with cholestanoyl-CoA substrate | Hydratase/dehydratase activity of MFE-2 (GO:0033989) | Recombinant enzyme characterization and domain mapping |
| LC-MS bile acid profiling | Levels of bile acid intermediates and products | Assessing pathway flux in knockout or knock-in cells |
| Quantitative RT-PCR | HSD17B4 mRNA expression | Linking promoter activity to enzyme levels |
| Promoter reporter assay | Transcriptional activity of the MFE-2 promoter | Mapping regulatory elements controlling GO:0033989 enzyme expression |
| Western blot | MFE-2 protein levels and domain integrity | Validating knockout, knock-in, or overexpression models |
| Immunofluorescence microscopy | Peroxisomal localization of MFE-2 | Confirming proper targeting of tagged knock-in alleles |
| Substrate specificity assays with hydroxyacyl-CoA substrates | Relative activity toward different substrates | Comparing hydratase and dehydrogenase substrate preferences |
| CRISPR knockout screening | Genes required for peroxisomal beta-oxidation flux | Identifying modifiers of GO:0033989-dependent pathways |
Enzyme activity assays
Direct measurement of GO:0033989 requires enzyme assays using (24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestanoyl-CoA as substrate and detection of the 24,25-unsaturated product or water release. Such assays can be performed with recombinant MFE-2 domains or with peroxisome-enriched fractions. Substrate specificity studies of peroxisomal short-chain alcohol dehydrogenase superfamily members provide a template for designing these assays and for comparing hydratase and dehydrogenase activities.
Gene expression and promoter analysis
Because the human MFE-2 gene promoter has been characterized, reporter assays and quantitative PCR can be used to measure HSD17B4 expression under different conditions. Promoter deletion and mutation analysis can identify regulatory elements that control the level of the enzyme carrying GO:0033989. These methods help link transcriptional regulation to metabolic flux through peroxisomal beta-oxidation.
Metabolomics and lipidomics
LC-MS-based bile acid profiling can quantify the substrates and products of the reaction, providing indirect evidence of GO:0033989 activity in cells. Changes in the ratio of 24-hydroxy cholestanoyl-CoA to 24,25-unsaturated cholest-24-enoyl-CoA can indicate altered hydratase activity. Combining metabolomics with genetic perturbation is a powerful way to test the pathway role of MFE-2.
CRISPR-based functional genomics
CRISPR knockout, point-mutation knock-in, and overexpression models allow causal testing of HSD17B4 and related genes in the peroxisomal beta-oxidation pathway. Domain-specific knock-in can separate the hydratase activity (GO:0033989) from the dehydrogenase activity of MFE-2. These models can be combined with enzyme assays and metabolomics to build a mechanistic picture of the pathway.
How CRISPR Can Be Used to Study GO:0033989 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity
Knockout
CRISPR knockout of HSD17B4 eliminates both hydratase (GO:0033989) and dehydrogenase activities, providing a clean background to test the consequences of losing peroxisomal beta-oxidation. Knockout cells can be profiled by LC-MS to detect accumulation of cholestanoyl-CoA intermediates. Such models are essential for establishing causality between the enzyme and bile acid synthesis defects.
Point Mutation
Point mutations in the hydratase domain of HSD17B4 can selectively abolish GO:0033989 while preserving the dehydrogenase domain. These models help dissect the contribution of the hydratase step to overall peroxisomal beta-oxidation and bile acid synthesis. They are also useful for testing whether patient variants affect catalysis, stability, or substrate binding.
Knock-in
Knock-in of patient-derived HSD17B4 variants or of tagged alleles allows study of the enzyme in its native genomic context. Tagged knock-in enables imaging and immunoprecipitation to assess peroxisomal localization and protein interactions. Variant knock-in combined with metabolomics can reveal genotype-phenotype relationships for GO:0033989.
Overexpression
Overexpression of wild-type or mutant HSD17B4 can test whether increasing hydratase activity enhances flux through peroxisomal beta-oxidation. Overexpression models are also useful for producing recombinant enzyme for in vitro assays. Comparing wild-type and mutant overexpression helps confirm that observed phenotypes depend on GO:0033989 catalytic activity.
How EDITGENE Supports 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity Research
Researchers studying 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity-related genes often need to determine whether a candidate gene is causally involved in peroxisomal beta-oxidation and bile acid synthesis, or whether it is merely correlated with the phenotype. EDITGENE provides CRISPR-based cell models and screening services that allow precise perturbation of HSD17B4 and related pathway genes, enabling functional validation of GO:0033989 in a relevant cellular context.
Contact EDITGENE today to design your custom CRISPR model for 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity research.
Frequently Asked Questions About 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity
What is GO:0033989?
GO:0033989 is a molecular_function annotation for 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity, a hydro-lyase reaction that converts a 24-hydroxy cholestanoyl-CoA to a 24,25-unsaturated cholest-24-enoyl-CoA plus water.
What reaction does 3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA hydratase activity catalyze?
It catalyzes the reversible dehydration of (24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestanoyl-CoA to (24E)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholest-24-enoyl-CoA and H2O.
Which gene encodes the enzyme with GO:0033989?
The human gene HSD17B4 encodes peroxisomal multifunctional enzyme type 2 (MFE-2), which contains the hydratase domain carrying GO:0033989.
Where in the cell does this activity occur?
It occurs in peroxisomes, where MFE-2 participates in beta-oxidation of bile acid intermediates and other substrates.
What is the role of GO:0033989 in bile acid synthesis?
It is a step in the peroxisomal beta-oxidation spiral that shortens the side chain of C27 bile acid intermediates, helping produce mature C24 bile acids.
What diseases are linked to defects in this activity?
Defects in peroxisomal beta-oxidation, including MFE-2/HSD17B4 dysfunction, are associated with D-bifunctional protein deficiency and related peroxisomal disorders.
What are the synonyms of GO:0033989?
Synonyms include (24R,25R)-3alpha,7alpha,12alpha,24-tetrahydroxy-5beta-cholestanoyl-CoA hydro-lyase activity, 46 kDa hydratase 2 activity, and D-3-hydroxyacyl-CoA dehydratase activity.
How can I study GO:0033989 in the lab?
You can use enzyme assays with cholestanoyl-CoA substrates, LC-MS bile acid profiling, and CRISPR knockout or knock-in models targeting HSD17B4.
Does the enzyme have other activities besides GO:0033989?
Yes, MFE-2 also has a dehydrogenase domain and can act as a D-3-hydroxyacyl-CoA dehydratase on other hydroxyacyl-CoA substrates.
What CRISPR models are useful for studying this activity?
Knockout of HSD17B4, point mutations in the hydratase domain, tagged knock-in for localization, and overexpression of wild-type or mutant enzyme are all useful models.
Conclusion
GO:0033989 defines a specific hydratase step in peroxisomal beta-oxidation of bile acid intermediates, catalyzed by the hydratase domain of MFE-2/HSD17B4. Its activity is essential for proper bile acid side-chain shortening, and its dysfunction is linked to severe peroxisomal disorders. Understanding substrate specificity and domain organization of the enzyme is key to interpreting its role in metabolism. By combining enzyme assays, metabolomics, and CRISPR-based genetic models, researchers can dissect the contribution of GO:0033989 to peroxisomal biology and disease. EDITGENE offers the knockout, point-mutation, knock-in, overexpression, and screening services needed to build these models and accelerate discovery in this pathway.
References
- 1. Novikov DK et al.. 2001. Characterization of the promoter region of the human peroxisomal multifunctional enzyme type 2 gene.. Biochem Biophys Res Commun 284(1):226-31 PMID: 11374894
- 2. Qin YM et al.. 2000. Substrate specificities of peroxisomal members of short-chain alcohol dehydrogenase superfamily: expression and characterization of dehydrogenase part of Candida tropicalis multifunctional enzyme.. J Lipid Res 41(1):93-8 PMID: 10627506
