GO:0004745 all-trans-retinol dehydrogenase (NAD+) activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004745 describes the NAD+-dependent oxidation of all-trans-retinol to all-trans-retinal, a reversible reaction that can also reduce all-trans-retinal back to all-trans-retinol.
• The enzyme recognizes both free retinol and retinol bound to cellular retinol-binding protein 1 (CRBP1), with higher affinity for the bound form.
• Several microsomal and photoreceptor dehydrogenases, including RoDH-4, RDH10, and retinol dehydrogenase type 1 (RDH1), catalyze this activity.
• The reaction is central to the visual cycle and to retinoic acid homeostasis, linking vitamin A metabolism to vision and gene regulation.
• The retinoid oxidoreductase complex (ROC) contains antagonistically bifunctional subunits that balance retinol oxidation and retinal reduction.
• Dysregulation of this activity is associated with retinal degeneration, impaired visual cycle function, and altered retinoic acid signaling.
Description
GO:0004745, all-trans-retinol dehydrogenase (NAD+) activity, is a molecular function defined by the NAD+-dependent oxidation of all-trans-retinol to all-trans-retinal. This reaction is reversible and can also operate as a retinal reductase, reducing all-trans-retinal back to all-trans-retinol. The enzyme recognizes both free retinol and retinol bound to cellular retinol-binding protein 1 (CRBP1), but it has higher affinity for the CRBP1-bound form. This dual substrate recognition allows the activity to participate in retinoid trafficking and metabolism across different cellular compartments. Researchers study GO:0004745 because it sits at the intersection of vitamin A metabolism, the visual cycle, and retinoic acid biosynthesis. The product all-trans-retinal is a precursor for 11-cis-retinal in the eye and for all-trans-retinoic acid, a potent regulator of gene expression. Consequently, changes in this activity can influence photoreceptor function, embryonic development, and epithelial homeostasis. Multiple enzymes, including RoDH-4, RDH10, and photoreceptor retinol dehydrogenases, exhibit this activity, and their subunit interactions in the retinoid oxidoreductase complex further modulate flux through the pathway.
all-trans-retinol dehydrogenase (NAD+) activity At A Glance
| GO ID | GO:0004745 |
|---|---|
| GO term | all-trans-retinol dehydrogenase (NAD+) activity |
| Ontology | molecular_function |
| Synonym | all-trans retinol dehydrogenase activity; retinal reductase activity; retinene reductase activity; retinol dehydrogenase activity; retinol (vitamin A1) dehydrogenase activity |
| Major function | NAD+-dependent oxidation of all-trans-retinol to all-trans-retinal, with reverse retinal reductase activity |
| Substrate specificity | Recognizes free all-trans-retinol and CRBP1-bound all-trans-retinol, with higher affinity for the bound form |
| Cofactor | NAD+ as the electron acceptor; NADH as the product |
| Representative enzymes | RoDH-4, RDH10, photoreceptor all-trans-retinol dehydrogenase, and subunits of the retinoid oxidoreductase complex |
| Pathway context | Visual cycle and retinoic acid biosynthesis |
What Is GO:0004745?
In simple terms, GO:0004745 is the enzyme activity that removes two hydrogen atoms from all-trans-retinol using NAD+ as the electron acceptor, producing all-trans-retinal, NADH, and a proton. The reaction can proceed in reverse, reducing all-trans-retinal back to all-trans-retinol. The activity accepts retinol either free in solution or bound to cellular retinol-binding protein 1 (CRBP1), and it shows higher affinity for the CRBP1-bound substrate. This definition is based on the QuickGO entry for GO:0004745 and is supported by biochemical studies of microsomal and photoreceptor dehydrogenases.
Why Is all-trans-retinol dehydrogenase (NAD+) activity Important in Cell Biology?
GO:0004745 is important because it controls the first committed step in the oxidation of vitamin A to retinal and retinoic acid. This activity determines the availability of all-trans-retinal for 11-cis-retinal production in the visual cycle and for all-trans-retinoic acid synthesis, which regulates gene expression during development and adult tissue homeostasis. Because the reaction is reversible, the same activity can also regenerate all-trans-retinol, contributing to retinoid recycling and protection against excessive retinal accumulation. Mutations or expression changes in enzymes carrying this activity have been linked to retinal dysfunction and altered retinoid homeostasis, making it a target for studies of vision, metabolism, and differentiation.
• Provides all-trans-retinal for the visual cycle and for 11-cis-retinal regeneration in photoreceptors.
• Supplies the substrate for all-trans-retinoic acid synthesis, a key regulator of gene expression.
• Maintains retinoid homeostasis by balancing retinol oxidation and retinal reduction.
• Enables CRBP1-bound retinol metabolism, linking retinoid trafficking to enzymatic conversion.
• Contributes to the function of the retinoid oxidoreductase complex, which fine-tunes retinoid flux.
• Is relevant to retinal degeneration and visual cycle disorders.
• Influences differentiation and proliferation through retinoic acid signaling.
• Provides a biochemical target for modulating vitamin A metabolism in disease models.
• Helps explain tissue-specific retinoid effects in liver, eye, and skeletal muscle.
• Supports research on microsomal versus photoreceptor retinoid dehydrogenases.
What Happens During all-trans-retinol dehydrogenase (NAD+) activity?
Substrate binding and cofactor recruitment
In simple terms: The enzyme first grabs retinol and NAD+ so that the chemical reaction can start.
The activity begins with binding of all-trans-retinol and NAD+. The enzyme can accept retinol either free in solution or bound to cellular retinol-binding protein 1 (CRBP1), and it displays higher affinity for the CRBP1-bound form. This dual recognition allows the dehydrogenase to access retinol in different cellular contexts. NAD+ serves as the electron acceptor and is positioned for hydride transfer during catalysis.
Oxidation of all-trans-retinol to all-trans-retinal
In simple terms: The enzyme removes hydrogen from retinol, turning it into retinal.
In the forward reaction, the enzyme catalyzes the NAD+-dependent oxidation of all-trans-retinol to all-trans-retinal, producing NADH and a proton. This step is reversible, and the same activity can reduce all-trans-retinal back to all-trans-retinol under appropriate conditions. The reaction is stereospecific for the all-trans isomer, distinguishing it from enzymes that act on 11-cis or 13-cis retinoids.
Reverse reaction and retinal reduction
In simple terms: The enzyme can also work backwards, converting retinal back to retinol.
The retinal reductase direction of GO:0004745 reduces all-trans-retinal to all-trans-retinol using NADH. This reverse activity is important for regenerating retinol and for preventing accumulation of reactive retinal species. Photoreceptor outer segment all-trans-retinol dehydrogenase was characterized as the visual cycle enzyme that reduces all-trans-retinal to all-trans-retinol. The balance between oxidation and reduction depends on cofactor availability and the local retinoid environment.
Integration with the visual cycle
In simple terms: The retinal made by this enzyme is used to regenerate the light-sensing molecule in the eye.
In the visual cycle, all-trans-retinal generated from light-activated rhodopsin is reduced to all-trans-retinol by photoreceptor retinol dehydrogenases. The all-trans-retinol is then transported to the retinal pigment epithelium, where it is converted to 11-cis-retinal. RDH10 exhibits 11-cis-retinol dehydrogenase activity and interacts with visual cycle proteins, linking GO:0004745-related enzymes to retinoid processing in the eye. This integration ensures a continuous supply of visual chromophore.
Role in retinoic acid homeostasis
In simple terms: The retinal produced can be turned into retinoic acid, which controls many genes.
All-trans-retinal produced by GO:0004745 can be further oxidized to all-trans-retinoic acid, a ligand for nuclear receptors that regulate gene expression. The retinoid oxidoreductase complex, which contains antagonistically bifunctional subunits, is required for maintaining all-trans-retinoic acid homeostasis. This places the activity within a network that balances retinol oxidation and retinal reduction to control retinoic acid levels.
Key Genes Involved in GO:0004745 all-trans-retinol dehydrogenase (NAD+) activity
The following genes and proteins have been experimentally linked to all-trans-retinol dehydrogenase (NAD+) activity or to the retinoid oxidoreductase complex that carries this activity.
| Gene | Major Role | Research Relevance |
|---|---|---|
| RDH1 (RoDH-4) | Microsomal NAD+-dependent dehydrogenase that oxidizes all-trans-retinol and 3alpha-hydroxysteroids | Characterized as a human microsomal retinol dehydrogenase with activity toward free and CRBP1-bound retinol |
| RDH10 | 11-cis-retinol dehydrogenase that interacts with visual cycle proteins | Links GO:0004745-related activity to the visual cycle and retinoid processing |
| RDH12 | Photoreceptor all-trans-retinol dehydrogenase that reduces all-trans-retinal to all-trans-retinol | Visual cycle enzyme important for retinal protection and regeneration |
| RDH8 | Photoreceptor retinol dehydrogenase involved in all-trans-retinal reduction | Contributes to the visual cycle and retinal homeostasis |
| CRBP1 | Cellular retinol-binding protein 1 that delivers retinol to dehydrogenases | Enhances recognition of bound retinol by RoDH-4 and related enzymes |
| RDH11 | Retinoid oxidoreductase complex subunit | Part of the hetero-oligomeric complex that modulates retinoid flux |
| RDH13 | Retinoid oxidoreductase complex subunit | Participates in subunit interactions of the retinoid oxidoreductase complex |
| RDH14 | Retinoid oxidoreductase complex subunit | Contributes to the bifunctional retinoid oxidoreductase complex |
| SRP-35 | Skeletal muscle sarcoplasmic reticulum retinol dehydrogenase | Demonstrates tissue-specific expression of retinol dehydrogenase activity |
| RALDH1 | Retinal dehydrogenase that oxidizes all-trans-retinal to retinoic acid | Downstream enzyme that uses the product of GO:0004745 |
| RALDH2 | Retinal dehydrogenase involved in retinoic acid synthesis | Links GO:0004745 to retinoic acid homeostasis |
| RALDH3 | Retinal dehydrogenase in retinoid signaling | Contributes to retinoic acid production from retinal |
| CYP26A1 | Cytochrome P450 that degrades retinoic acid | Regulates retinoic acid levels downstream of GO:0004745 |
| CYP26B1 | Retinoic acid-degrading enzyme | Balances retinoic acid homeostasis in tissues |
| CYP26C1 | Retinoic acid hydroxylase | Participates in retinoic acid clearance |
| LRAT | Lecithin retinol acyltransferase that esterifies retinol | Competes with retinol oxidation in retinoid storage |
| RPE65 | Retinal pigment epithelium isomerohydrolase | Generates 11-cis-retinol for visual chromophore synthesis |
| ABCA4 | Retinal transporter that moves all-trans-retinal | Affects substrate availability for GO:0004745 in photoreceptors |
How Is all-trans-retinol dehydrogenase (NAD+) activity Regulated?
The activity of all-trans-retinol dehydrogenase (NAD+) is regulated at multiple levels. Substrate availability is controlled by cellular retinol-binding protein 1 (CRBP1), which delivers retinol to the enzyme and enhances its recognition. Cofactor balance between NAD+ and NADH influences the direction of the reversible reaction, favoring oxidation or reduction depending on cellular redox state. The formation of the hetero-oligomeric retinoid oxidoreductase complex provides an additional layer of regulation, as subunit interactions can shift the complex between retinol oxidation and retinal reduction. Expression of RDH10 and other retinol dehydrogenases is tissue-specific and developmentally regulated, contributing to local control of retinoid flux. Finally, downstream enzymes such as RALDH and CYP26 modulate retinoic acid levels, indirectly affecting the demand for the retinal produced by GO:0004745.
all-trans-retinol dehydrogenase (NAD+) activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RDH12 | Retinal degeneration and visual cycle dysfunction | Rdh12 knockout mouse; point-mutation knock-in of patient variants |
| RDH10 | Visual cycle and retinoid processing defects | Rdh10 knockout or tagged knock-in in retinal cells |
| RDH8 | Impaired all-trans-retinal clearance in photoreceptors | Rdh8 knockout mouse; overexpression of wild-type RDH8 |
| CRBP1 | Altered retinol trafficking and substrate delivery | CRBP1 knockout; CRBP1 overexpression in hepatic or retinal cells |
| RALDH1/2/3 | Retinoic acid deficiency or excess | Knockout and point-mutation models to alter retinoic acid synthesis |
Retinal degeneration and visual cycle disorders
Enzymes with all-trans-retinol dehydrogenase (NAD+) activity are essential for the visual cycle. RDH12, a photoreceptor all-trans-retinol dehydrogenase, reduces all-trans-retinal to all-trans-retinol, and its dysfunction can lead to retinal degeneration. RDH10 interacts with visual cycle proteins and exhibits 11-cis-retinol dehydrogenase activity, linking GO:0004745-related chemistry to retinoid processing in the eye. Mutations or altered expression of these enzymes may impair chromophore regeneration and photoreceptor survival.
Retinoic acid homeostasis and developmental disorders
The retinal produced by GO:0004745 is a precursor for all-trans-retinoic acid, a morphogen that regulates gene expression during development. The retinoid oxidoreductase complex, which contains antagonistically bifunctional subunits, is required for maintaining all-trans-retinoic acid homeostasis. Disruption of this balance can alter differentiation and proliferation, contributing to developmental abnormalities and tissue-specific pathology.
Metabolic and tissue-specific roles
Microsomal retinol dehydrogenases such as RoDH-4 oxidize all-trans-retinol and 3alpha-hydroxysteroids, indicating a broader role in steroid and retinoid metabolism. SRP-35 is a skeletal muscle sarcoplasmic reticulum retinol dehydrogenase, suggesting tissue-specific functions beyond the eye and liver. These findings imply that GO:0004745 may contribute to metabolic homeostasis in multiple organs.
From all-trans-retinol dehydrogenase (NAD+) activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a candidate retinol dehydrogenase alter all-trans-retinal levels? | CRISPR knockout of the candidate gene in retinal or hepatic cells |
| Does a patient variant change catalytic activity? | Point-mutation knock-in of the variant into the endogenous locus |
| Can a tagged enzyme be used to study localization and interactions? | Knock-in of an epitope or fluorescent tag at the endogenous locus |
| Does overexpression of the enzyme increase retinoic acid production? | Overexpression of wild-type or mutant cDNA in cell lines |
| Which subunits interact in the retinoid oxidoreductase complex? | Knock-in of tagged subunits followed by co-immunoprecipitation |
| Can CRISPR screening identify modifiers of retinol dehydrogenase activity? | Genome-wide CRISPR library screening with a retinoid-responsive reporter |
How to Study the all-trans-retinol dehydrogenase (NAD+) activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| NADH absorbance assay | NADH production at 340 nm | Real-time monitoring of retinol oxidation |
| HPLC retinoid separation | Retinol and retinal levels | Substrate and product quantification |
| LC-MS/MS retinoid profiling | Retinol, retinal, and retinoic acid concentrations | Metabolic flux and homeostasis studies |
| RNA-seq | Transcript levels of RDH and retinoid genes | Tissue-specific expression analysis |
| Co-immunoprecipitation | Protein-protein interactions | Retinoid oxidoreductase complex assembly |
| Immunofluorescence | Subcellular localization | Microsomal or photoreceptor localization |
| CRISPR knockout | Loss-of-function phenotype | Causal testing of candidate genes |
| CRISPR knock-in | Tagged or mutant endogenous protein | Localization, interaction, and variant studies |
Enzymatic assays for retinol dehydrogenase activity
Direct measurement of GO:0004745 uses NAD+ reduction or retinoid conversion. Reactions can be monitored spectrophotometrically by NADH formation at 340 nm or by HPLC to separate all-trans-retinol and all-trans-retinal. Using free versus CRBP1-bound retinol reveals substrate preference and affinity. These assays are foundational for characterizing wild-type and mutant enzymes.
Expression and localization studies
RNA-seq and quantitative PCR can quantify transcripts of RDH genes in tissues or cell models. Tagged knock-in models allow immunofluorescence and subcellular fractionation to determine whether the enzyme localizes to microsomes, photoreceptor outer segments, or sarcoplasmic reticulum. Co-immunoprecipitation and proximity labeling can identify interacting proteins such as visual cycle components or retinoid oxidoreductase complex subunits.
Retinoid profiling by mass spectrometry
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) quantifies all-trans-retinol, all-trans-retinal, and retinoic acid in cells and tissues. This approach measures the metabolic impact of altering GO:0004745 activity and can reveal compensatory changes in retinoid homeostasis. Stable isotope-labeled retinoids can trace flux through the pathway.
Genetic and pharmacological perturbation
CRISPR knockout, point-mutation knock-in, and overexpression models enable causal testing of specific enzymes. Pharmacological inhibitors of retinol dehydrogenases or retinoid metabolism can complement genetic approaches. Combining these perturbations with retinoid profiling and transcriptomics identifies downstream effects on retinoic acid target genes.
How CRISPR Can Be Used to Study GO:0004745 all-trans-retinol dehydrogenase (NAD+) activity
Knockout
CRISPR knockout of genes encoding retinol dehydrogenases, such as RDH1, RDH10, or RDH12, can eliminate GO:0004745 activity in a cell model. Knockout cells are used to measure changes in all-trans-retinal, all-trans-retinol, and retinoic acid levels, and to test whether a candidate gene is required for retinoid homeostasis. These models also help distinguish redundant enzymes within the retinoid oxidoreductase complex.
Point Mutation
Point-mutation knock-in introduces disease-associated or catalytically important variants into the endogenous locus. This approach tests whether a specific amino acid change alters NAD+ binding, substrate recognition, or catalytic turnover. Point mutants can be compared with wild-type enzymes in enzymatic assays and retinoid profiling to establish causality.
Knock-in
Knock-in of epitope or fluorescent tags at the endogenous locus enables visualization and interaction studies of retinol dehydrogenases. Tagged subunits of the retinoid oxidoreductase complex can be used for co-immunoprecipitation and proximity labeling to define complex composition. Tagged models also allow tracking of enzyme localization in microsomes, photoreceptors, or sarcoplasmic reticulum.
Overexpression
Overexpression of wild-type or mutant retinol dehydrogenases increases GO:0004745 activity and can drive retinoic acid production. Overexpression models are useful for testing whether increased enzyme levels alter differentiation, proliferation, or retinoid-sensitive gene expression. They also provide a gain-of-function complement to knockout studies.
How EDITGENE Supports all-trans-retinol dehydrogenase (NAD+) activity Research
Researchers studying all-trans-retinol dehydrogenase (NAD+) activity-related genes often need to determine whether a candidate gene is causally involved in retinoid metabolism, visual cycle function, or retinoic acid signaling. EDITGENE provides CRISPR-based cell models and screening services to test these hypotheses with endogenous regulation intact.
Contact EDITGENE today to design your custom CRISPR model for all-trans-retinol dehydrogenase (NAD+) activity research.
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Frequently Asked Questions About all-trans-retinol dehydrogenase (NAD+) activity
What is all-trans-retinol dehydrogenase (NAD+) activity?
It is the enzyme activity defined by GO:0004745 that uses NAD+ to oxidize all-trans-retinol to all-trans-retinal, and can also reduce all-trans-retinal back to all-trans-retinol.
What genes are involved in all-trans-retinol dehydrogenase (NAD+) activity?
Genes include RDH1 (RoDH-4), RDH10, RDH12, RDH8, and subunits of the retinoid oxidoreductase complex such as RDH11, RDH13, and RDH14.
What is the reaction catalyzed by GO:0004745?
The reaction is all-trans-retinol + NAD+ = all-trans-retinal + NADH + H+, and it is reversible.
Does the enzyme prefer free or CRBP1-bound retinol?
It recognizes both forms but has higher affinity for retinol bound to cellular retinol-binding protein 1 (CRBP1).
How is all-trans-retinol dehydrogenase activity measured?
It can be measured by NADH formation at 340 nm or by HPLC or LC-MS/MS quantification of retinol and retinal.
What is the role of GO:0004745 in the visual cycle?
It produces all-trans-retinal and can reduce it back to all-trans-retinol, contributing to chromophore regeneration in photoreceptors.
Which diseases are linked to retinol dehydrogenase dysfunction?
Retinal degeneration and visual cycle disorders have been linked to RDH12 and RDH10 dysfunction, and altered retinoic acid homeostasis is linked to the retinoid oxidoreductase complex.
What is the retinoid oxidoreductase complex?
It is a hetero-oligomeric complex with antagonistically bifunctional subunits that helps maintain all-trans-retinoic acid homeostasis.
Can CRISPR be used to study all-trans-retinol dehydrogenase activity?
Yes, CRISPR knockout, point-mutation knock-in, tagged knock-in, and overexpression models can test the function of retinol dehydrogenases and their regulators.
What cell models are suitable for studying GO:0004745?
Retinal pigment epithelium, photoreceptor-derived cells, hepatic cells, and skeletal muscle cells are suitable because they express retinol dehydrogenases and retinoid-binding proteins.
Conclusion
GO:0004745, all-trans-retinol dehydrogenase (NAD+) activity, is a central enzymatic function in vitamin A metabolism. It catalyzes the reversible NAD+-dependent interconversion of all-trans-retinol and all-trans-retinal, accepts both free and CRBP1-bound retinol, and operates within the visual cycle and retinoic acid biosynthetic pathways. Multiple enzymes, including RoDH-4, RDH10, RDH12, and retinoid oxidoreductase complex subunits, contribute to this activity in a tissue-specific manner. Understanding its regulation and disease relevance requires precise genetic models and quantitative retinoid profiling. CRISPR-based knockout, point-mutation, knock-in, overexpression, and library screening approaches provide powerful tools to dissect the causal roles of individual enzymes and their regulators in health and disease.
References
- 1. Gough WH et al.. 1998. cDNA cloning and characterization of a new human microsomal NAD+-dependent dehydrogenase that oxidizes all-trans-retinol and 3alpha-hydroxysteroids.. J Biol Chem 273(31):19778-85 PMID: 9677409
- 2. Farjo KM et al.. 2009. The 11-cis-retinol dehydrogenase activity of RDH10 and its interaction with visual cycle proteins.. Invest Ophthalmol Vis Sci 50(11):5089-97 PMID: 19458327
- 3. Rattner A et al.. 2000. Identification and characterization of all-trans-retinol dehydrogenase from photoreceptor outer segments, the visual cycle enzyme that reduces all-trans-retinal to all-trans-retinol.. J Biol Chem 275(15):11034-43 PMID: 10753906
- 4. Adams MK et al.. 2021. Characterization of subunit interactions in the hetero-oligomeric retinoid oxidoreductase complex.. Biochem J 478(19):3597-3611 PMID: 34542554
- 5. Lapshina EA et al.. 2003. Differential recognition of the free versus bound retinol by human microsomal retinol/sterol dehydrogenases: characterization of the holo-CRBP dehydrogenase activity of RoDH-4.. Biochemistry 42(3):776-84 PMID: 12534290
- 6. Jang GF et al.. 2000. Stereoisomeric specificity of the retinoid cycle in the vertebrate retina.. J Biol Chem 275(36):28128-38 PMID: 10871622
- 7. Belyaeva OV et al.. 2017. The antagonistically bifunctional retinoid oxidoreductase complex is required for maintenance of all-trans-retinoic acid homeostasis.. J Biol Chem 292(14):5884-5897 PMID: 28232491
- 8. Treves S et al.. 2012. SRP-35, a newly identified protein of the skeletal muscle sarcoplasmic reticulum, is a retinol dehydrogenase.. Biochem J 441(2):731-41 PMID: 21995425
