GO:0047834 D-threo-aldose 1-dehydrogenase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0047834 D-threo-aldose 1-dehydrogenase activity is a molecular_function defined as catalysis of the reaction: a D-threo-aldose + NAD+ = a D-threo-aldono-1,5-lactone + NADH.
• The enzyme is widely known as L-fucose dehydrogenase and catalyzes the first step of L-fucose degradation, converting L-fucose to L-fucono-1,5-lactone.
• HSD17B14 has been identified as an L-fucose dehydrogenase that initiates the L-fucose degradation pathway in mammals.
• The reaction product, L-fucono-1,5-lactone, is hydrolyzed by a lactonase from the amidohydrolase superfamily, completing the initial two-step conversion of L-fucose.
• D-threo-aldose 1-dehydrogenase activity is used in diagnostic assays for free and bound L-fucose in urine and glycoconjugates.
• The enzyme is regulated by nutritional and hormonal status, as shown by altered rat liver D-arabinose (L-fucose) dehydrogenase activity in fasting and diabetes models.
Description
GO:0047834 D-threo-aldose 1-dehydrogenase activity is a molecular_function term describing the NAD+-dependent oxidation of a D-threo-aldose to the corresponding D-threo-aldono-1,5-lactone. The term is synonymous with L-fucose dehydrogenase activity, reflecting the enzyme's well-characterized role in L-fucose metabolism. This activity is the first committed step of the L-fucose degradation pathway, a route that allows cells to utilize the rare sugar L-fucose as a carbon source. Because L-fucose is a terminal monosaccharide of many glycoconjugates, its catabolism is linked to glycoprotein and glycolipid turnover, and the enzyme has become a practical tool for quantifying L-fucose in biological samples. Researchers study D-threo-aldose 1-dehydrogenase activity to understand rare-sugar metabolism, to develop diagnostic assays for fucose-containing biomolecules, and to probe metabolic reprogramming in disease models.
D-threo-aldose 1-dehydrogenase activity At A Glance
| GO ID | GO:0047834 |
|---|---|
| GO term | D-threo-aldose 1-dehydrogenase activity |
| Ontology | molecular_function |
| Synonym | L-fucose dehydrogenase activity; D-threo-aldose:NAD+ 1-oxidoreductase activity; (2S,3R)-aldose dehydrogenase activity; dehydrogenase, L-fucose; L-fucose (D-arabinose) dehydrogenase activity |
| Major function | NAD+-dependent oxidation of D-threo-aldoses such as L-fucose to the corresponding 1,5-lactone, initiating L-fucose degradation |
| Reaction | a D-threo-aldose + NAD+ = a D-threo-aldono-1,5-lactone + NADH |
| Cofactor | NAD+ (nicotinamide adenine dinucleotide) |
| Representative enzyme | HSD17B14 (hydroxysteroid 17-beta dehydrogenase 14) is an L-fucose dehydrogenase |
| Pathway context | First step of the L-fucose degradation pathway; product is hydrolyzed by an L-fucono-1,5-lactonase |
| Diagnostic use | Enzymatic determination of free and bound L-fucose in urine and glycoconjugates |
What Is GO:0047834?
D-threo-aldose 1-dehydrogenase activity (GO:0047834) is the catalysis of the reaction: a D-threo-aldose + NAD+ = a D-threo-aldono-1,5-lactone + NADH. In this reaction, the enzyme oxidizes the C1 hydroxyl group of a D-threo-aldose sugar using NAD+ as the electron acceptor, forming a lactone and NADH. The best-studied substrate is L-fucose, which is a D-threo-aldose, so the enzyme is commonly called L-fucose dehydrogenase. The reaction is the first step in L-fucose degradation, and the lactone product is subsequently hydrolyzed by a lactonase.
Why Is D-threo-aldose 1-dehydrogenase activity Important in Cell Biology?
D-threo-aldose 1-dehydrogenase activity is important because it controls the entry of L-fucose into catabolism, a process that influences cellular carbon and energy metabolism and the turnover of fucosylated glycoconjugates. The enzyme is also a practical analytical reagent: because the reaction produces NADH, it can be coupled to spectrophotometric or fluorometric readouts for quantifying L-fucose and fucose-containing molecules. In mammals, the activity is sensitive to nutritional and hormonal state, linking it to metabolic physiology. In fungi, L-fucose-responsive regulation connects this activity to carbohydrate-active enzyme expression. Together, these roles make GO:0047834 a focal point for studies of rare-sugar metabolism, glycobiology, and metabolic disease.
• Initiates the L-fucose degradation pathway by converting L-fucose to L-fucono-1,5-lactone.
• Enables cells to use L-fucose as a carbon source, connecting rare-sugar metabolism to central metabolism.
• Provides a NADH-generating reaction that is exploited in quantitative assays for L-fucose.
• Supports enzymatic determination of free L-fucose in urine for clinical chemistry.
• Enables measurement of bound fucose in glycoconjugates after release.
• Is regulated by fasting and diabetes in rat liver, indicating a role in metabolic physiology.
• Contributes to L-fucose-responsive gene regulation in Trichoderma reesei.
• The product lactone is processed by a dedicated lactonase, defining a two-step metabolic module.
• Provides a target for engineering fucose-utilizing or fucose-sensing pathways.
• Serves as a model for studying NAD+-dependent sugar dehydrogenases.
Molecular Mechanism of D-threo-aldose 1-dehydrogenase activity
Substrate recognition and binding
In simple terms: The enzyme grabs a specific sugar molecule called a D-threo-aldose, such as L-fucose, and holds it in place.
D-threo-aldose 1-dehydrogenase activity acts on D-threo-aldoses, a stereochemical class of sugars that includes L-fucose. The enzyme binds the sugar substrate and positions its C1 hydroxyl group for oxidation. The best-characterized substrate is L-fucose, which is why the activity is widely known as L-fucose dehydrogenase. Substrate specificity is a defining feature of the enzyme and underlies its use in analytical assays for L-fucose.
NAD+ binding and hydride transfer
In simple terms: The enzyme uses NAD+ as a helper molecule to remove electrons from the sugar, turning NAD+ into NADH.
The reaction catalyzed by GO:0047834 is NAD+-dependent: a D-threo-aldose + NAD+ = a D-threo-aldono-1,5-lactone + NADH. NAD+ serves as the electron acceptor, and its reduction to NADH accompanies oxidation of the sugar substrate. The generation of NADH is the basis for coupled enzymatic assays that monitor the reaction at 340 nm or by fluorescence.
Lactone formation and downstream hydrolysis
In simple terms: The oxidized sugar spontaneously forms a ring-shaped lactone, which is then opened by another enzyme.
Oxidation of the C1 hydroxyl group of a D-threo-aldose yields a D-threo-aldono-1,5-lactone. In the L-fucose degradation pathway, the product L-fucono-1,5-lactone is subsequently hydrolyzed by an L-fucono-1,5-lactonase belonging to the amidohydrolase superfamily. This two-step module converts L-fucose to a lactone and then to the corresponding aldonic acid, channeling the sugar into further catabolism.
Physiological regulation of enzyme activity
In simple terms: The amount of enzyme activity in the body changes with diet and hormones.
Rat liver D-arabinose (L-fucose) dehydrogenase activity is altered by fasting and by experimental diabetes induced by alloxan or streptozotocin, indicating that the activity is regulated by nutritional and hormonal status. In the fungus Trichoderma reesei, an L-fucose-responsive transcription factor cross-regulates a diverse array of carbohydrate-active enzymes, linking L-fucose metabolism to broader carbon-source regulation. These observations show that GO:0047834 is not a static housekeeping activity but is integrated into metabolic signaling.
Analytical and biotechnological exploitation
In simple terms: Because the reaction makes NADH, it can be used to measure how much fucose is present in a sample.
The NADH produced by D-threo-aldose 1-dehydrogenase activity enables quantitative assays for L-fucose. A one-pot reaction with alpha1,2-fucosidase and L-fucose dehydrogenase has been developed for quantitative assay of 2'-fucosyllactose. Purified L-fucose dehydrogenase from Agrobacterium radiobacter has been applied to the assay of bound fucose in glycoconjugates, and enzymatic determination of urinary free L-fucose has been established. These applications demonstrate the practical value of the activity in glycobiology and clinical chemistry.
Key Genes Involved in GO:0047834 D-threo-aldose 1-dehydrogenase activity
The following genes and proteins are directly associated with D-threo-aldose 1-dehydrogenase activity or its immediate metabolic context, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HSD17B14 | L-fucose dehydrogenase that initiates the L-fucose degradation pathway | Mammalian model for GO:0047834; knockout and overexpression studies of fucose catabolism |
| L-fucose dehydrogenase (Agrobacterium radiobacter) | Purified enzyme used for bound-fucose assays | Biochemical characterization and assay development |
| L-fucose dehydrogenase (source organism for urinary assay) | Enzymatic determination of urinary free L-fucose | Clinical chemistry application |
| L-fucono-1,5-lactonase (cog3618, amidohydrolase superfamily) | Hydrolyzes the lactone product of the dehydrogenase reaction | Downstream enzyme completing the two-step L-fucose conversion |
| Trichoderma reesei L-fucose-responsive transcription factor | Cross-regulates carbohydrate-active enzyme expression in response to L-fucose | Fungal carbon-source regulation and biotechnology |
| D-arabinose (L-fucose) dehydrogenase (rat liver) | Liver enzyme activity altered by fasting and diabetes | Metabolic physiology and diabetes models |
| alpha1,2-fucosidase | Releases L-fucose from 2'-fucosyllactose for dehydrogenase-based assay | One-pot quantitative assay development |
| NAD+ | Essential cofactor accepting electrons in the dehydrogenase reaction | Cofactor requirement and assay readout |
| L-fucose | Principal physiological substrate (a D-threo-aldose) | Substrate specificity and pathway entry |
| L-fucono-1,5-lactone | Immediate product of the dehydrogenase reaction | Pathway intermediate and lactonase substrate |
| D-arabinose | Alternative D-threo-aldose substrate | Substrate range and historical nomenclature |
| 2'-fucosyllactose | Human milk oligosaccharide quantified via coupled dehydrogenase assay | Analytical application |
| Glycoconjugates (fucosylated) | Source of bound fucose measured after release | Glycobiology and biomarker research |
| Urinary free L-fucose | Analyte measured by enzymatic assay | Clinical diagnostics |
| 14C-labeled L-fucose | Tracer used to study respiration to 14CO2 in animals | In vivo metabolic flux studies |
| 14C-labeled D-arabinose | Tracer used to study respiration to 14CO2 in animals | In vivo metabolic flux studies |
| L-fucose degradation pathway enzymes | Collective machinery for fucose catabolism | Pathway reconstruction and metabolic engineering |
How Is D-threo-aldose 1-dehydrogenase activity Regulated?
D-threo-aldose 1-dehydrogenase activity is regulated at multiple levels. In rat liver, the activity of D-arabinose (L-fucose) dehydrogenase changes with fasting and with alloxan- or streptozotocin-induced diabetes, indicating nutritional and hormonal control. In Trichoderma reesei, an L-fucose-responsive transcription factor cross-regulates a diverse array of carbohydrate-active enzymes, linking L-fucose availability to transcriptional programs. At the pathway level, the dehydrogenase reaction is coupled to a downstream L-fucono-1,5-lactonase that consumes the lactone product, so flux through the module depends on both enzymes. These findings support a model in which GO:0047834 is embedded in metabolic and transcriptional regulatory networks rather than being constitutively fixed.
D-threo-aldose 1-dehydrogenase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HSD17B14 | L-fucose degradation and metabolic physiology | Knockout and overexpression cell models; metabolic flux assays |
| D-arabinose (L-fucose) dehydrogenase (rat liver) | Fasting and diabetes-associated metabolic changes | Streptozotocin or alloxan diabetes rat model; fasting studies |
| L-fucose dehydrogenase (Agrobacterium radiobacter) | Bound-fucose measurement in glycoconjugates | Recombinant enzyme production and assay development |
| L-fucose dehydrogenase (urinary assay) | Clinical determination of free L-fucose | Enzymatic assay validation in clinical samples |
| L-fucono-1,5-lactonase (cog3618) | Downstream lactone metabolism | Enzyme kinetics and structural studies |
Metabolic disease and diabetes
Rat liver D-arabinose (L-fucose) dehydrogenase activity is altered by fasting and by alloxan or streptozotocin diabetes, linking GO:0047834 to metabolic physiology and experimental diabetes models. This makes the enzyme a candidate marker or mediator of altered hepatic sugar metabolism in diabetes research.
Glycoconjugate turnover and clinical chemistry
Because L-fucose is a component of many glycoconjugates, enzymes with D-threo-aldose 1-dehydrogenase activity are used to measure free and bound L-fucose. Enzymatic determination of urinary free L-fucose has been established, and purified L-fucose dehydrogenase has been applied to assay bound fucose in glycoconjugates. These assays connect the activity to disorders involving fucosylated glycoconjugates and to clinical chemistry workflows.
Fungal carbon metabolism and biotechnology
In Trichoderma reesei, an L-fucose-responsive transcription factor cross-regulates carbohydrate-active enzymes, indicating that L-fucose metabolism, including GO:0047834, is integrated into fungal carbon-source regulation. This has implications for industrial enzyme production and for engineering fucose-responsive strains.
In vivo fucose and arabinose metabolism
Respiration of 14CO2 by intact animals given L-[1-14C]fucose or D-[1-14C]arabinose has been studied across species, providing in vivo evidence that these D-threo-aldoses are metabolized and oxidized to CO2. This supports the physiological relevance of the dehydrogenase-initiated pathway in whole organisms.
From D-threo-aldose 1-dehydrogenase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of HSD17B14 block L-fucose degradation? | HSD17B14 knockout cell model |
| Does a point mutation in the catalytic site abolish dehydrogenase activity? | Point-mutation knock-in of HSD17B14 |
| Can the enzyme be tagged for localization and interaction studies? | Tagged knock-in of HSD17B14 |
| Does overexpression increase L-fucose consumption? | HSD17B14 overexpression cell model |
| How does the lactonase cooperate with the dehydrogenase? | Knockout or overexpression of the cog3618 lactonase |
| How does L-fucose availability affect fungal carbohydrate-active enzyme expression? | Trichoderma reesei regulatory mutants |
How to Study the D-threo-aldose 1-dehydrogenase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| NADH-coupled spectrophotometric assay | Dehydrogenase activity via NADH production | Quantification of L-fucose or 2'-fucosyllactose |
| Enzymatic urinary assay | Free L-fucose concentration | Clinical chemistry and diagnostics |
| Bound-fucose assay with purified enzyme | Fucose released from glycoconjugates | Glycobiology research |
| 14C-tracer respiration | Whole-body oxidation of L-fucose or D-arabinose to 14CO2 | In vivo metabolic flux studies |
| Knockout/overexpression genetics | Requirement of candidate genes for L-fucose degradation | Functional validation of HSD17B14 |
| Enzyme purification and kinetics | Substrate specificity and catalytic parameters | Biochemical characterization |
| Lactonase activity assay | Hydrolysis of L-fucono-1,5-lactone | Pathway reconstitution |
| Expression profiling in fungi | Carbohydrate-active enzyme gene regulation by L-fucose | Fungal biotechnology |
Enzymatic activity assays
D-threo-aldose 1-dehydrogenase activity is measured by coupling the NADH produced to a spectrophotometric or fluorometric readout. A one-pot reaction with alpha1,2-fucosidase and L-fucose dehydrogenase has been developed for quantitative assay of 2'-fucosyllactose. Purified L-fucose dehydrogenase has been used to assay bound fucose in glycoconjugates, and enzymatic determination of urinary free L-fucose has been established. These assays are the primary methods for detecting GO:0047834 activity in samples.
Metabolic flux and tracer studies
In vivo metabolism of D-threo-aldoses can be followed with 14C-labeled substrates. Respiration of 14CO2 by intact animals given L-[1-14C]fucose or D-[1-14C]arabinose has been used to assess whole-body oxidation of these sugars. Such tracer methods complement in vitro enzyme assays by showing that the pathway is active in living organisms.
Genetic and expression studies
Knockout, knockdown, and overexpression approaches can test the contribution of candidate genes such as HSD17B14 to L-fucose degradation. In fungi, regulatory mutants and expression profiling can reveal how L-fucose-responsive transcription factors control carbohydrate-active enzyme genes. These genetic methods connect enzyme activity to pathway function and regulation.
Biochemical purification and characterization
Purification of L-fucose dehydrogenase from source organisms such as Agrobacterium radiobacter allows determination of substrate specificity, cofactor requirements, and kinetic parameters. Characterization of the downstream L-fucono-1,5-lactonase from the amidohydrolase superfamily defines the second step of the pathway. Together, these biochemical approaches provide the mechanistic basis for understanding GO:0047834.
How CRISPR Can Be Used to Study GO:0047834 D-threo-aldose 1-dehydrogenase activity
Knockout
CRISPR knockout of HSD17B14 can test whether this gene is required for L-fucose degradation and for the D-threo-aldose 1-dehydrogenase activity measured in cells. Loss-of-function models allow researchers to assess metabolic consequences, such as accumulation of L-fucose or altered flux through downstream pathways. Knockout of the downstream lactonase gene can similarly reveal its role in processing the dehydrogenase product.
Point Mutation
Point-mutation knock-in can be used to dissect catalytic residues or regulatory sites in HSD17B14 and related enzymes. By introducing specific amino-acid substitutions, researchers can separate dehydrogenase activity from other functions and test structure-function hypotheses. Such models are valuable when a complete knockout would be lethal or would confound interpretation.
Knock-in
Tagged knock-in of HSD17B14 enables localization, interaction, and stability studies while preserving endogenous regulation. Knock-in of reporter or affinity tags can also facilitate purification of the enzyme for biochemical assays. These models help connect GO:0047834 activity to specific cellular compartments and protein complexes.
Overexpression
Overexpression of HSD17B14 or other L-fucose dehydrogenases can increase L-fucose consumption and NADH production, providing a gain-of-function counterpart to knockout studies. Overexpression models are useful for testing whether increased enzyme activity alters metabolic or signaling outputs. They also support the development of cell-based assays for the pathway.
How EDITGENE Supports D-threo-aldose 1-dehydrogenase activity Research
Researchers studying D-threo-aldose 1-dehydrogenase activity-related genes often need to determine whether a candidate gene is causally involved in L-fucose metabolism, glycoconjugate turnover, or metabolic regulation. Establishing causality requires precise genetic models that can remove, modify, or amplify the gene of interest without confounding off-target effects. EDITGENE provides end-to-end CRISPR services tailored to these needs, from knockout and point-mutation cell models to knock-in reporters, overexpression lines, and CRISPR library screening with bioinformatics support.
Contact EDITGENE today to design your custom CRISPR model for D-threo-aldose 1-dehydrogenase activity research.
Frequently Asked Questions About D-threo-aldose 1-dehydrogenase activity
What is D-threo-aldose 1-dehydrogenase activity?
It is a molecular_function (GO:0047834) defined as catalysis of the reaction: a D-threo-aldose + NAD+ = a D-threo-aldono-1,5-lactone + NADH. It is commonly known as L-fucose dehydrogenase activity.
What genes are involved in D-threo-aldose 1-dehydrogenase activity?
HSD17B14 encodes an L-fucose dehydrogenase that initiates the L-fucose degradation pathway. Other enzymes with this activity have been purified from organisms such as Agrobacterium radiobacter.
What is the reaction catalyzed by GO:0047834?
The enzyme oxidizes a D-threo-aldose using NAD+ to produce a D-threo-aldono-1,5-lactone and NADH.
Why is L-fucose dehydrogenase important?
It catalyzes the first step of L-fucose degradation and is used in assays to measure free and bound L-fucose in biological samples.
How is D-threo-aldose 1-dehydrogenase activity measured?
It is typically measured by coupling NADH production to a spectrophotometric or fluorometric readout, as in one-pot assays with alpha1,2-fucosidase.
Is D-threo-aldose 1-dehydrogenase activity regulated by diet?
Yes, rat liver D-arabinose (L-fucose) dehydrogenase activity changes with fasting and experimental diabetes.
What is the product of the dehydrogenase reaction?
The immediate product is a D-threo-aldono-1,5-lactone, such as L-fucono-1,5-lactone, which is hydrolyzed by a lactonase.
Which enzyme hydrolyzes the lactone product?
An L-fucono-1,5-lactonase from the amidohydrolase superfamily hydrolyzes L-fucono-1,5-lactone.
Can D-threo-aldose 1-dehydrogenase activity be used to assay human milk oligosaccharides?
Yes, a one-pot reaction with alpha1,2-fucosidase and L-fucose dehydrogenase has been developed for quantitative assay of 2'-fucosyllactose.
How do I study GO:0047834 with CRISPR?
CRISPR knockout, point-mutation, knock-in, and overexpression models of HSD17B14 and related genes allow functional dissection of the pathway.
Conclusion
GO:0047834 D-threo-aldose 1-dehydrogenase activity defines an NAD+-dependent oxidation that initiates L-fucose degradation and supports a wide range of analytical applications. Its best-characterized mammalian enzyme, HSD17B14, links the activity to metabolic physiology and to the turnover of fucosylated glycoconjugates. The reaction product is processed by a dedicated lactonase, forming a two-step metabolic module. Because the activity is regulated by nutritional and hormonal state and is integrated into fungal carbon-source regulation, it is a compelling target for metabolic, glycobiological, and biotechnological research.
References
- 1. Hobbs ME et al.. 2013. Discovery of an L-fucono-1,5-lactonase from cog3618 of the amidohydrolase superfamily.. Biochemistry 52(1):239-53 PMID: 23214453
- 2. Witecka A et al.. 2024. Hydroxysteroid 17-β dehydrogenase 14 (HSD17B14) is an L-fucose dehydrogenase, the initial enzyme of the L-fucose degradation pathway.. J Biol Chem 300(8):107501 PMID: 38944119
- 3. Metzger RP et al.. 1980. Respiration of 14CO2 by intact animals of various species given L-[1-14C]fucose or D-[1-14C]arabinose.. Biochim Biophys Acta 629(3):482-9 PMID: 6774763
- 4. Mobley PW et al.. 1972. The effect of fasting, alloxan diabetes, and streptozotocin diabetes on rat liver D-arabinose (L-fucose) dehydrogenase activity.. Biochem Med 6(2):178-83 PMID: 4260354
- 5. Seydametova E et al.. 2019. Development of a quantitative assay for 2´-fucosyllactose via one-pot reaction with α1,2-fucosidase and l-fucose dehydrogenase.. Anal Biochem 582:113358 PMID: 31278898
- 6. Zhao Q et al.. 2025. An l-fucose-responsive transcription factor cross-regulates the expression of a diverse array of carbohydrate-active enzymes in Trichoderma reesei.. PLoS Genet 21(8):e1011815 PMID: 40788923
- 7. Tsuji Y et al.. 1992. Purification and some properties of L-fucose dehydrogenase from Agrobacterium radiobacter and its application to the assay of bound-fucose in glycoconjugates.. Biochim Biophys Acta 1117(2):167-73 PMID: 1525177
- 8. Endo M et al.. 1980. Enzymic determination of urinary free L-fucose.. Clin Chim Acta 103(3):269-75 PMID: 7398072
