GO:0052650 all-trans-retinol dehydrogenase (NADP+) activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0052650 describes the NADP+-dependent oxidation of all-trans-retinol to all-trans-retinal, a reversible reaction that also produces NADPH and H+.
• RDH10 is the best-characterized all-trans-retinol dehydrogenase (NADP+) in the visual cycle, converting all-trans-retinol to all-trans-retinal in the retinal pigment epithelium and Müller cells.
• The reaction is stereospecific and central to the retinoid cycle, supplying substrate for 11-cis-retinal regeneration and phototransduction.
• RDH10 and related short-chain dehydrogenase/reductases can form hetero-oligomeric complexes that modulate retinoid oxidoreductase activity.
• Loss or mutation of RDH10 disrupts visual cycle flux and has been linked to retinal degeneration and developmental defects in model systems.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential to dissect the catalytic and non-catalytic roles of GO:0052650 enzymes.
Description
GO:0052650, all-trans-retinol dehydrogenase (NADP+) activity, is a molecular function that catalyzes the reversible oxidation of all-trans-retinol to all-trans-retinal using NADP+ as the electron acceptor, yielding NADPH and H+. This activity is a critical node in the retinoid (visual) cycle, where the redox state of vitamin A derivatives determines the availability of retinaldehyde for chromophore regeneration and for signaling molecules such as retinoic acid. The reaction is stereospecific and is carried out by short-chain dehydrogenase/reductase (SDR) enzymes, most notably RDH10, which was identified as an all-trans-retinol dehydrogenase in retinal Müller cells and the retinal pigment epithelium (RPE). Researchers study GO:0052650 because it sits at the intersection of vision, development, and metabolism. The enzyme activity controls the flux of all-trans-retinol toward all-trans-retinal, which is subsequently isomerized to 11-cis-retinal for rhodopsin regeneration. In addition to its role in the visual cycle, all-trans-retinol dehydrogenase activity influences the production of retinoic acid, a morphogen that regulates gene expression during embryogenesis and in adult tissues. Understanding GO:0052650 therefore requires integrating enzymology, membrane biology, and genetics. The activity is membrane-associated, often microsomal, and can be modulated by protein-protein interactions within the retinoid cycle machinery. This article summarizes the authoritative definition, the key genes and protein complexes, disease links, and the CRISPR-based methods used to interrogate this activity in research and drug discovery.
all-trans-retinol dehydrogenase (NADP+) activity At A Glance
| GO ID | GO:0052650 |
|---|---|
| GO term | all-trans-retinol dehydrogenase (NADP+) activity |
| Ontology | molecular_function |
| Synonym | all-trans retinal reductase activity; all-trans-retinol dehydrogenase activity; NADP(H)-dependent retinol dehydrogenase/reductase activity; NADP-retinol dehydrogenase activity; retinol dehydrogenase activity; retinol dehydrogenase [NADP+] activity; retinol:NADP+ oxidoreductase activity |
| Major function | Reversible oxidation of all-trans-retinol to all-trans-retinal with NADP+ as cofactor |
| Reaction | all-trans-retinol + NADP+ = all-trans-retinal + NADPH + H+ |
| Cofactor | NADP+ / NADPH |
| Subcellular location | Microsomal membrane / endoplasmic reticulum-associated |
| Representative enzyme | RDH10 (retinol dehydrogenase 10) |
What Is GO:0052650?
In simple terms, GO:0052650 is the enzyme activity that removes two hydrogen atoms from all-trans-retinol (vitamin A alcohol) and transfers them to NADP+, producing all-trans-retinal (the aldehyde form) plus NADPH and a proton. The reaction is reversible, so the same activity can also reduce all-trans-retinal back to all-trans-retinol when NADPH is abundant. It is a NADP(H)-dependent retinol dehydrogenase/reductase activity that belongs to the oxidoreductase class and is typically associated with microsomal membranes. The official definition is: Catalysis of the reaction: all-trans-retinol + NADP+ = all-trans-retinal + NADPH + H+.
Why Is all-trans-retinol dehydrogenase (NADP+) activity Important in Cell Biology?
GO:0052650 is important because it controls the first committed step in the visual cycle that generates all-trans-retinal, the precursor of the visual chromophore 11-cis-retinal. Without this activity, photoreceptors cannot regenerate rhodopsin efficiently, leading to impaired dark adaptation and retinal degeneration in model systems. Beyond vision, the same activity contributes to retinoic acid biosynthesis, influencing embryonic patterning, stem cell differentiation, and immune function. Because the reaction is reversible and NADP(H)-dependent, it also serves as a metabolic valve that buffers retinaldehyde toxicity, which is relevant to age-related macular degeneration and other retinopathies.
• Provides all-trans-retinal for 11-cis-retinal regeneration and rhodopsin recycling in the visual cycle.
• Supports retinoic acid biosynthesis, a key morphogen in embryonic development and tissue homeostasis.
• Maintains retinaldehyde homeostasis and limits toxic aldehyde accumulation in the retina.
• Is a candidate modifier of inherited retinal dystrophies and age-related macular degeneration.
• Enables NADPH production, linking retinoid metabolism to cellular redox balance.
• Serves as a drug target for modulating visual cycle flux in retinal disease.
• Provides a biochemical marker for RPE and Müller cell function in vitro.
• Is essential for interpreting gene-environment interactions in vitamin A metabolism.
Mechanism, Genes and Research Methods
Substrate recognition and binding
In simple terms: The enzyme must first grab all-trans-retinol and hold it in the right orientation.
All-trans-retinol dehydrogenase (NADP+) activity is mediated by short-chain dehydrogenase/reductase (SDR) enzymes that bind all-trans-retinol in a hydrophobic substrate pocket. RDH10 was identified as an all-trans-retinol dehydrogenase in retinal Müller cells and RPE, showing specificity for the all-trans isomer. The enzyme requires NADP+ as the preferred cofactor, distinguishing it from NAD+-dependent retinol dehydrogenases. Substrate binding is stereospecific, as shown by stereoisomeric specificity studies of the retinoid cycle.
Catalytic oxidation and hydride transfer
In simple terms: The enzyme removes hydrogen from retinol and hands it to NADP+.
The catalytic mechanism involves hydride transfer from the C15 alcohol of all-trans-retinol to the nicotinamide ring of NADP+, forming all-trans-retinal and NADPH. This oxidation is reversible, and the equilibrium can favor reduction when NADPH levels are high. The reaction also releases a proton, consistent with the GO definition. Rod outer segment retinol dehydrogenase studies demonstrated substrate specificity and a role in phototransduction, supporting the importance of this redox step.
Membrane association and complex assembly
In simple terms: The enzyme works while attached to cell membranes, often with partner proteins.
Many all-trans-retinol dehydrogenases are microsomal or membrane-associated enzymes. RDH10 interacts with visual cycle proteins, and its 11-cis-retinol dehydrogenase activity depends on these interactions. Hetero-oligomeric retinoid oxidoreductase complexes form through subunit interactions, which can modulate catalytic efficiency and substrate channeling. This membrane-bound organization ensures efficient flux of retinoids between enzymatic steps.
Role in the visual cycle and phototransduction
In simple terms: This activity helps the eye recycle the molecules needed to see light.
In the visual cycle, all-trans-retinol produced in photoreceptors is transported to the RPE, where all-trans-retinol dehydrogenase (NADP+) activity converts it to all-trans-retinal. All-trans-retinal is then isomerized to 11-cis-retinal, which recombines with opsin to form rhodopsin. Rod outer segment retinol dehydrogenase has been implicated in phototransduction, linking retinoid redox to light responses. Disruption of this step impairs chromophore regeneration and visual function.
Regulation by cofactors and interacting proteins
In simple terms: The enzyme's speed depends on NADP+/NADPH balance and partner proteins.
The NADP+/NADPH ratio directly influences the direction and rate of the reaction catalyzed by GO:0052650 enzymes. Protein-protein interactions within the retinoid oxidoreductase complex can enhance or inhibit activity, as shown for RDH10 and its partners. The 11-cis-retinol dehydrogenase activity of RDH10 is modulated by visual cycle proteins, indicating that complex formation is a regulatory mechanism. These features make the activity sensitive to cellular redox state and metabolic demand.
Key Genes Involved in GO:0052650 all-trans-retinol dehydrogenase (NADP+) activity
The following genes encode enzymes, transporters, and binding proteins that directly or indirectly support all-trans-retinol dehydrogenase (NADP+) activity and the retinoid cycle.
| Gene | Major Role | Research Relevance |
|---|---|---|
| RDH10 | All-trans-retinol dehydrogenase (NADP+) that oxidizes all-trans-retinol to all-trans-retinal | Primary enzyme for GO:0052650; knockout and point-mutation models reveal visual cycle defects |
| RPE65 | Retinoid isomerohydrolase that generates 11-cis-retinol | Interacts with RDH10 and influences visual cycle flux |
| LRAT | Lecithin retinol acyltransferase that esterifies retinol | Upstream of RDH10 in retinoid storage and mobilization |
| CRALBP | Cellular retinaldehyde-binding protein that binds 11-cis-retinal | Modulates retinoid trafficking and RDH10 activity |
| RDH5 | 11-cis-retinol dehydrogenase in RPE | Related SDR enzyme; comparison helps define GO:0052650 specificity |
| RDH11 | Retinol dehydrogenase with broad substrate specificity | Potential redundancy with RDH10 in retinoid metabolism |
| RDH12 | Retinal dehydrogenase in photoreceptors | Protects against retinaldehyde toxicity; disease relevance |
| ALDH1A1 | Retinaldehyde dehydrogenase for retinoic acid synthesis | Downstream of all-trans-retinal produced by GO:0052650 |
| ALDH1A2 | Retinaldehyde dehydrogenase in development | Links GO:0052650 to retinoic acid signaling |
| ALDH1A3 | Retinaldehyde dehydrogenase in retina | Contributes to retinoic acid production from all-trans-retinal |
| CRBP1 | Cellular retinol-binding protein 1 | Delivers all-trans-retinol to dehydrogenases |
| CRBP2 | Cellular retinol-binding protein 2 | Modulates retinol availability for oxidation |
| STRA6 | Retinol transporter | Supplies substrate for GO:0052650 activity |
| TTR | Transthyretin, retinol transport | Affects systemic retinol delivery to tissues |
| RBP4 | Retinol-binding protein 4 | Transports retinol to target cells for oxidation |
| BCO1 | Beta-carotene oxygenase 1 | Generates all-trans-retinal and retinol from carotenoids |
| BCO2 | Beta-carotene oxygenase 2 | Contributes to retinoid substrate pools |
| SDR family members | Short-chain dehydrogenases/reductases | Candidate enzymes for GO:0052650-like activity |
How Is all-trans-retinol dehydrogenase (NADP+) activity Regulated?
All-trans-retinol dehydrogenase (NADP+) activity is regulated at multiple levels. The NADP+/NADPH ratio determines the thermodynamic direction of the reaction, so cellular redox state acts as an immediate regulator. Protein-protein interactions within the hetero-oligomeric retinoid oxidoreductase complex modulate catalytic efficiency and substrate channeling, as shown for RDH10 and its partners. The 11-cis-retinol dehydrogenase activity of RDH10 is influenced by visual cycle proteins such as RPE65 and CRALBP, indicating that complex assembly is a key regulatory mechanism. Additionally, substrate availability is controlled by retinol-binding proteins and transporters, which deliver all-trans-retinol to the enzyme. These layers of regulation ensure that retinoid flux matches the demands of phototransduction and retinoic acid signaling.
all-trans-retinol dehydrogenase (NADP+) activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RDH10 | Retinal degeneration and visual cycle defects | Rdh10 knockout and point-mutation knock-in mice |
| RPE65 | Leber congenital amaurosis and retinoid cycle disorders | Rpe65 knockout and overexpression cell models |
| LRAT | Retinal dystrophy and vitamin A deficiency phenotypes | Lrat knockout and rescue models |
| ALDH1A1 | Retinoic acid signaling in cancer and development | Aldh1a1 knockout and overexpression models |
| RDH12 | Photoreceptor degeneration and retinaldehyde toxicity | Rdh12 knockout and point-mutation models |
Retinal degeneration and visual cycle defects
Impaired all-trans-retinol dehydrogenase (NADP+) activity can disrupt the visual cycle, leading to reduced 11-cis-retinal regeneration and photoreceptor dysfunction. RDH10 mutations or loss of function have been associated with retinal degeneration in model systems, and its interaction with visual cycle proteins is critical for normal vision. Studies of rod outer segment retinol dehydrogenase highlight the importance of this activity in phototransduction and retinal health.
Developmental disorders and retinoic acid signaling
Because all-trans-retinal is a precursor for retinoic acid, altered GO:0052650 activity can affect embryonic patterning and organogenesis. Disruption of RDH10 function in animal models leads to developmental defects consistent with impaired retinoic acid synthesis. This links the enzyme activity to birth defects and stem cell differentiation research.
Age-related macular degeneration and retinoid toxicity
Dysregulated retinoid metabolism, including all-trans-retinol dehydrogenase activity, may contribute to age-related macular degeneration by promoting toxic retinaldehyde accumulation. The reversible nature of the reaction and its NADP(H) dependence suggest that redox imbalance could exacerbate retinal stress. Targeting this activity is therefore of interest for therapeutic modulation of visual cycle flux.
From all-trans-retinol dehydrogenase (NADP+) activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is RDH10 required for all-trans-retinol oxidation? | RDH10 knockout cell lines and mice |
| Does a specific RDH10 mutation alter catalytic activity? | Point-mutation knock-in via CRISPR |
| Can tagged RDH10 be used to study complex assembly? | Tagged knock-in (e.g., FLAG/HA) |
| Does overexpression of RDH10 increase retinoid flux? | Overexpression cell models |
| Which proteins interact with RDH10 in the visual cycle? | Knock-in with affinity tags and proteomics |
| Can GO:0052650 activity be measured in live cells? | Reporter cells and biochemical assays |
How to Study the all-trans-retinol dehydrogenase (NADP+) activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| NADPH absorbance assay | NADPH production at 340 nm | Enzyme kinetics of GO:0052650 |
| HPLC retinoid analysis | All-trans-retinal and retinol levels | Substrate-product quantification |
| CRISPR knockout | Loss of enzyme function | Causal testing of RDH10 in cells |
| Point-mutation knock-in | Specific residue effects | Structure-function studies |
| Tagged knock-in | Protein interactions and localization | Complex assembly analysis |
| RNA-seq | Gene expression changes | Pathway profiling in disease models |
| Co-immunoprecipitation | Protein-protein interactions | Visual cycle complex mapping |
| Electroretinography | Retinal function | Visual cycle defects in vivo |
Biochemical enzyme assays
All-trans-retinol dehydrogenase (NADP+) activity is typically measured by monitoring NADPH production at 340 nm or by HPLC quantification of all-trans-retinal. These assays use microsomal fractions or recombinant enzyme and require careful control of NADP+ and substrate concentrations. Stereoisomeric specificity can be assessed by comparing all-trans and cis isomers.
CRISPR-based genetic models
CRISPR knockout, point-mutation, and knock-in models allow causal testing of GO:0052650 enzymes in cells and animals. Knockout of RDH10 abolishes all-trans-retinol oxidation, while point mutations can separate catalytic from non-catalytic functions. Tagged knock-in enables interaction studies within the retinoid oxidoreductase complex.
Expression and proteomic profiling
RNA-seq and proteomics can quantify RDH10 and related SDR enzymes across tissues and disease states. Co-immunoprecipitation and mass spectrometry identify interacting partners such as RPE65 and CRALBP. These methods help define the regulatory network around GO:0052650.
Imaging and functional readouts
Fluorescence imaging of retinoid autofluorescence and rhodopsin regeneration can report visual cycle flux in vivo. Live-cell imaging of tagged enzymes reveals subcellular localization and dynamics. Electroretinography in animal models links enzyme activity to visual function.
How CRISPR Can Be Used to Study GO:0052650 all-trans-retinol dehydrogenase (NADP+) activity
Knockout
CRISPR knockout of RDH10 or related SDR genes eliminates all-trans-retinol dehydrogenase (NADP+) activity, providing a clean background to test substrate specificity and pathway flux. Knockout cell lines and mice show impaired retinoid processing and visual cycle defects. These models are essential for distinguishing GO:0052650 from other retinol dehydrogenase activities.
Point Mutation
Point-mutation knock-in via CRISPR allows precise testing of catalytic residues and cofactor-binding sites in RDH10. Such models can separate enzymatic activity from protein-protein interaction functions. They are valuable for mimicking human variants associated with retinal disease.
Knock-in
Tagged knock-in of RDH10 (e.g., FLAG, HA, or fluorescent tags) enables affinity purification and imaging of the enzyme in its native context. Knock-in of reporter cassettes can monitor expression dynamics during visual cycle activation. These models support interaction proteomics and live-cell studies.
Overexpression
Overexpression of RDH10 or related enzymes increases all-trans-retinol dehydrogenase activity and can drive retinoid flux toward all-trans-retinal. Overexpression models are used to test dose-dependent effects on retinoic acid signaling and retinaldehyde toxicity. They complement loss-of-function studies for bidirectional pathway control.
How EDITGENE Supports all-trans-retinol dehydrogenase (NADP+) activity Research
Researchers studying all-trans-retinol dehydrogenase (NADP+) activity-related genes often need to determine whether a candidate gene is causally involved in retinoid metabolism, visual cycle function, or disease. EDITGENE provides publication-ready CRISPR cell models and screening services to accelerate this work.
Contact EDITGENE today to design your custom CRISPR model for all-trans-retinol dehydrogenase (NADP+) activity research.
Frequently Asked Questions About all-trans-retinol dehydrogenase (NADP+) activity
What is all-trans-retinol dehydrogenase (NADP+) activity?
It is the enzyme activity defined by GO:0052650 that catalyzes the reversible oxidation of all-trans-retinol to all-trans-retinal using NADP+ as cofactor, producing NADPH and H+.
What genes are involved in all-trans-retinol dehydrogenase (NADP+) activity?
The best-characterized gene is RDH10, which encodes an all-trans-retinol dehydrogenase in the RPE and Müller cells; related SDR family members and visual cycle proteins such as RPE65 and CRALBP also participate.
What is the reaction catalyzed by GO:0052650?
The reaction is all-trans-retinol + NADP+ = all-trans-retinal + NADPH + H+, a reversible redox step.
Why is all-trans-retinol dehydrogenase important for vision?
It supplies all-trans-retinal for 11-cis-retinal regeneration and rhodopsin recycling, which are essential for phototransduction and normal vision.
Which enzyme is the main all-trans-retinol dehydrogenase in the retina?
RDH10 is a major all-trans-retinol dehydrogenase identified in retinal Müller cells and the RPE.
How is all-trans-retinol dehydrogenase (NADP+) activity measured?
Common methods include NADPH absorbance assays at 340 nm and HPLC quantification of all-trans-retinal, often using microsomal fractions or recombinant enzyme.
What diseases are linked to all-trans-retinol dehydrogenase dysfunction?
Impaired activity has been linked to retinal degeneration, visual cycle defects, developmental disorders via retinoic acid signaling, and age-related macular degeneration.
Can CRISPR be used to study GO:0052650?
Yes, CRISPR knockout, point-mutation, knock-in, and overexpression models are widely used to dissect the function of RDH10 and related enzymes.
What is the difference between all-trans-retinol dehydrogenase and 11-cis-retinol dehydrogenase?
All-trans-retinol dehydrogenase (GO:0052650) acts on the all-trans isomer, while 11-cis-retinol dehydrogenase acts on the 11-cis isomer; RDH10 can display both activities depending on context.
What cofactor does all-trans-retinol dehydrogenase (NADP+) use?
It uses NADP+ as the electron acceptor, producing NADPH, and is therefore NADP(H)-dependent.
Conclusion
GO:0052650, all-trans-retinol dehydrogenase (NADP+) activity, is a central redox reaction in retinoid metabolism and the visual cycle. Its best-characterized enzyme, RDH10, converts all-trans-retinol to all-trans-retinal using NADP+, supporting chromophore regeneration and retinoic acid synthesis. Dysregulation of this activity is linked to retinal degeneration, developmental defects, and retinoid toxicity, making it a compelling target for research and therapeutic intervention. CRISPR-based knockout, point-mutation, knock-in, and overexpression models, combined with biochemical and omics methods, provide powerful tools to dissect the mechanism and regulation of GO:0052650. EDITGENE offers end-to-end services to generate these models and accelerate discovery in retinoid biology and disease.
References
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- 2. Wu BX et al.. 2002. Cloning and characterization of a novel all-trans retinol short-chain dehydrogenase/reductase from the RPE.. Invest Ophthalmol Vis Sci 43(11):3365-72 PMID: 12407145
- 3. 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
- 4. 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
- 5. Adams MK et al.. 2021. Characterization of subunit interactions in the hetero-oligomeric retinoid oxidoreductase complex.. Biochem J 478(19):3597-3611 PMID: 34542554
- 6. Palczewski K et al.. 1994. Rod outer segment retinol dehydrogenase: substrate specificity and role in phototransduction.. Biochemistry 33(46):13741-50 PMID: 7947785
- 7. Jang GF et al.. 2000. Stereoisomeric specificity of the retinoid cycle in the vertebrate retina.. J Biol Chem 275(36):28128-38 PMID: 10871622
