GO:0047681 aryl-alcohol dehydrogenase (NADP+) activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0047681 describes aryl-alcohol dehydrogenase (NADP+) activity, the catalysis of an aromatic alcohol plus NADP+ to an aromatic aldehyde plus NADPH.
• The term is a molecular_function in the Gene Ontology and is synonymous with aryl alcohol dehydrogenase (nicotinamide adenine dinucleotide phosphate), aryl-alcohol:NADP+ oxidoreductase activity, and NADPH-linked benzaldehyde reductase activity.
• The reaction is reversible and depends on the redox cofactor NADP+/NADPH, linking aromatic alcohol metabolism to cellular reducing power.
• The enzyme was biochemically characterized in bacteria, for example in the metabolism of p-aminobenzoic acid, where p-aminobenzyl alcohol dehydrogenase activity was isolated and described.
• Aryl-alcohol dehydrogenase (NADP+) activity is relevant to aromatic aldehyde/alcohol interconversion, detoxification, and microbial aromatic metabolism.
• Transcriptomic studies of plant-microbe interactions, such as perennial ryegrass infected by pink snow mould, can reveal expression changes in genes annotated with oxidoreductase activities including aryl-alcohol dehydrogenases.
Description
Aryl-alcohol dehydrogenase (NADP+) activity (GO:0047681) is a Gene Ontology molecular_function term that defines the catalysis of the reversible redox reaction: an aromatic alcohol + NADP+ = an aromatic aldehyde + NADPH. This activity belongs to the oxidoreductase class of enzymes and specifically uses NADP+ as the electron acceptor, distinguishing it from NAD+-dependent aryl-alcohol dehydrogenases. The term is therefore central to understanding how cells interconvert aromatic alcohols and aldehydes while balancing NADP+/NADPH pools. The activity was experimentally documented in bacterial systems, including the isolation and characterization of p-aminobenzyl alcohol dehydrogenase from p-aminobenzoic acid metabolism. Because aromatic aldehydes and alcohols participate in diverse metabolic and detoxification pathways, enzymes with this activity are of interest in microbiology, plant pathology, and biotechnology. Researchers studying aromatic metabolism, redox homeostasis, or microbial adaptation often encounter GO:0047681 when annotating gene function or interpreting transcriptomic and biochemical data.
aryl-alcohol dehydrogenase (NADP+) activity At A Glance
| GO ID | GO:0047681 |
|---|---|
| GO term | aryl-alcohol dehydrogenase (NADP+) activity |
| Ontology | molecular_function |
| Synonym | aryl alcohol dehydrogenase (nicotinamide adenine dinucleotide phosphate); aryl-alcohol:NADP+ oxidoreductase activity; NADPH-linked benzaldehyde reductase activity |
| Definition | Catalysis of the reaction: an aromatic alcohol + NADP+ = an aromatic aldehyde + NADPH. |
| Major function | Reversible oxidation of aromatic alcohols to aromatic aldehydes with NADP+ as electron acceptor, and the reverse reduction with NADPH. |
| Cofactor | NADP+/NADPH |
| Substrate class | Aromatic alcohols and aromatic aldehydes |
| Reaction direction | Reversible (oxidoreductase) |
What Is GO:0047681?
In plain terms, GO:0047681 describes an enzyme activity that converts an aromatic alcohol into an aromatic aldehyde using NADP+ as the oxidizing agent, producing NADPH. The reaction is reversible, so the same activity can also reduce an aromatic aldehyde back to the corresponding aromatic alcohol using NADPH. This definition is based on the QuickGO entry for GO:0047681, which states: Catalysis of the reaction: an aromatic alcohol + NADP+ = an aromatic aldehyde + NADPH.
Why Is aryl-alcohol dehydrogenase (NADP+) activity Important in Cell Biology?
GO:0047681 is important because it captures a specific redox activity that connects aromatic alcohol and aldehyde metabolism to the NADP+/NADPH cofactor system, which is central to cellular antioxidant defense and biosynthesis. The activity has been biochemically validated in bacteria, where it participates in the metabolism of aromatic compounds such as p-aminobenzoic acid derivatives. In plants and plant-associated microbes, expression of genes with oxidoreductase activities can change during infection and stress, as shown by transcriptome studies of perennial ryegrass during pink snow mould infection. Understanding this activity helps researchers annotate gene function, interpret metabolic flux, and design experiments that test the role of aromatic redox enzymes in physiology and disease.
• Defines a specific NADP+-dependent oxidoreductase activity for aromatic alcohols and aldehydes.
• Links aromatic metabolism to NADP+/NADPH redox balance, which is critical for biosynthesis and antioxidant defense.
• Provides a functional annotation for genes involved in microbial aromatic compound metabolism.
• Supports interpretation of transcriptomic changes in plant-microbe interactions, where oxidoreductase genes can be differentially expressed.
• Helps distinguish NADP+-dependent from NAD+-dependent aryl-alcohol dehydrogenases in enzyme classification.
• Relevant to biotechnological applications such as biocatalysis of aromatic aldehydes and alcohols.
• Can be used as a molecular function annotation in genome and metagenome analysis pipelines.
• Guides experimental design for biochemical assays measuring NADPH production or consumption.
• Contributes to understanding detoxification pathways for aromatic compounds in bacteria and plants.
• Facilitates comparative studies of aromatic alcohol dehydrogenases across species.
Molecular Mechanism of aryl-alcohol dehydrogenase (NADP+) activity
Substrate binding and specificity
In simple terms: The enzyme grabs an aromatic alcohol and NADP+ to start the reaction.
Aryl-alcohol dehydrogenase (NADP+) activity acts on aromatic alcohols, which contain an aromatic ring and a hydroxyl group, and uses NADP+ as the electron acceptor. The enzyme's active site must accommodate the aromatic moiety and the nicotinamide cofactor, providing specificity for NADP+ over NAD+. Biochemical characterization of p-aminobenzyl alcohol dehydrogenase demonstrated activity toward an aromatic alcohol substrate in the context of p-aminobenzoic acid metabolism.
Catalytic oxidation and NADPH formation
In simple terms: The enzyme removes electrons from the alcohol and gives them to NADP+, making NADPH.
During catalysis, the aromatic alcohol is oxidized to the corresponding aromatic aldehyde, while NADP+ is reduced to NADPH. This hydride transfer reaction is typical of oxidoreductases and is reversible. The production of NADPH links this activity to cellular redox pools and to pathways that require reducing power.
Reverse reaction and aldehyde reduction
In simple terms: The same enzyme can run backward, turning an aromatic aldehyde back into an alcohol using NADPH.
Because the reaction is reversible, the enzyme can also catalyze the NADPH-dependent reduction of an aromatic aldehyde to an aromatic alcohol. This reverse direction is sometimes described as NADPH-linked benzaldehyde reductase activity, one of the synonyms for GO:0047681. The ability to interconvert alcohols and aldehydes allows the enzyme to participate in both catabolic and anabolic routes depending on cellular conditions.
Cofactor dependence and redox balance
In simple terms: The enzyme depends on NADP+/NADPH, which connects it to the cell's reducing power.
The strict or preferred use of NADP+ distinguishes this activity from NAD+-dependent dehydrogenases. By consuming NADP+ and generating NADPH (or vice versa), the enzyme influences the NADP+/NADPH ratio, which is important for reductive biosynthesis and antioxidant systems. This cofactor specificity is a defining feature of GO:0047681.
Biological context and regulation
In simple terms: How much of this activity a cell has can change with growth conditions and stress.
The activity has been studied in bacterial systems, including p-aminobenzoic acid metabolism, where the enzyme was isolated and its properties described. In plant-microbe interactions, transcriptome profiling can reveal changes in expression of oxidoreductase genes, suggesting that related activities may be regulated during infection or stress. However, specific regulatory mechanisms for GO:0047681 are not fully defined in the provided literature.
Key Genes Involved in GO:0047681 aryl-alcohol dehydrogenase (NADP+) activity
The following genes and proteins are associated with aryl-alcohol dehydrogenase (NADP+) activity or related aromatic alcohol/aldehyde metabolism, based on the available literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| p-aminobenzyl alcohol dehydrogenase (bacterial) | Catalyzes oxidation of p-aminobenzyl alcohol to p-aminobenzaldehyde using NADP+ | Biochemical model for GO:0047681; isolated and characterized from p-aminobenzoic acid metabolism |
| Aryl-alcohol dehydrogenase (NADP+) (generic) | Reversible interconversion of aromatic alcohols and aldehydes | Enzyme activity annotation and assay development |
| NADPH-linked benzaldehyde reductase | Reduces aromatic aldehydes to alcohols using NADPH | Synonym for GO:0047681; relevant to aldehyde detoxification |
| Oxidoreductase genes in perennial ryegrass | Potential roles in aromatic metabolism during infection | Transcriptome studies of pink snow mould infection |
| Bacterial aromatic metabolism genes | Degradation or modification of aromatic compounds | Microbial physiology and biocatalysis |
| Plant defense-related oxidoreductases | May contribute to redox balance during pathogen attack | Plant-pathogen interaction research |
| NADP+-dependent dehydrogenases (family) | General redox catalysis with NADP+ | Comparative enzymology |
| Aldehyde reductases (related) | Reduce aldehydes using NADPH | Overlapping substrate specificity with GO:0047681 |
| Aromatic alcohol oxidases (related) | Oxidize aromatic alcohols using O2 | Contrast with NADP+-dependent dehydrogenases |
| p-aminobenzoic acid metabolic enzymes | Pathway context for p-aminobenzyl alcohol dehydrogenase | Bacterial folate and aromatic metabolism |
| Fungal aryl-alcohol dehydrogenases (homologs) | Aromatic alcohol oxidation in fungi | Plant-fungal interaction studies |
| NADPH-generating enzymes (e.g., glucose-6-phosphate dehydrogenase) | Supply NADPH for reductive reactions | Redox coupling with GO:0047681 |
| NADP+ transhydrogenases | Balance NADH/NADPH pools | Indirect regulation of NADP+-dependent activities |
| Benzaldehyde reductases | Reduce benzaldehyde to benzyl alcohol | Synonym-related activity |
| Aryl alcohol dehydrogenases (NAD+-dependent) | Similar reaction but use NAD+ | Distinguish from GO:0047681 |
| Stress-responsive oxidoreductases in plants | Respond to biotic stress | Transcriptomic markers |
| Microbial detoxification enzymes | Transform aromatic toxins | Bioremediation and biotechnology |
| Aromatic aldehyde dehydrogenases (related) | Further oxidize aldehydes to acids | Metabolic pathway context |
How Is aryl-alcohol dehydrogenase (NADP+) activity Regulated?
Specific regulatory mechanisms for aryl-alcohol dehydrogenase (NADP+) activity are not well defined in the provided literature. However, expression of oxidoreductase genes can change during biological interactions, as seen in transcriptome studies of perennial ryegrass during pink snow mould infection, where global transcriptome changes include genes with oxidoreductase activities. The activity itself is inherently regulated by substrate availability, NADP+/NADPH ratio, and possibly by post-translational modifications, but these aspects require further experimental validation.
aryl-alcohol dehydrogenase (NADP+) activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| p-aminobenzyl alcohol dehydrogenase (bacterial) | Bacterial aromatic metabolism; folate pathway | Bacterial knockout and biochemical assays |
| Plant oxidoreductases (e.g., in perennial ryegrass) | Pink snow mould infection response | Plant infection transcriptomics and gene knockout |
| NADPH-linked benzaldehyde reductase | Aldehyde detoxification | Enzyme kinetics and cell-based assays |
| Aryl-alcohol dehydrogenase (NADP+) homologs | Redox homeostasis | Overexpression and knockdown in model organisms |
| Microbial aromatic degradation enzymes | Bioremediation | Metagenomic and enzymatic screening |
Aryl-alcohol dehydrogenase (NADP+) activity and microbial metabolism
The enzyme activity was characterized in bacteria, where it participates in the metabolism of p-aminobenzoic acid, a precursor in folate biosynthesis. Disruption of such aromatic metabolic pathways can affect bacterial growth and survival, making this activity a potential target for antimicrobial research. However, direct links to human disease are not established in the provided literature.
Plant disease and stress responses
In plants, infection by pathogens such as pink snow mould causes global transcriptome changes, including alterations in genes annotated with oxidoreductase activities. While GO:0047681 specifically describes an NADP+-dependent aryl-alcohol dehydrogenase, related oxidoreductase activities may contribute to defense or stress responses. The exact role of GO:0047681 in plant disease remains to be determined.
Redox balance and disease
Because the activity consumes NADP+ and produces NADPH (or vice versa), it can influence cellular redox homeostasis. Imbalances in NADP+/NADPH are associated with oxidative stress in various organisms, but a direct causal link between GO:0047681 and human disease has not been demonstrated in the available literature.
From aryl-alcohol dehydrogenase (NADP+) activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of aryl-alcohol dehydrogenase (NADP+) activity alter aromatic alcohol metabolism? | CRISPR knockout of the candidate gene in a bacterial or fungal host |
| Does a point mutation in the active site abolish NADP+ dependence? | CRISPR point mutation (e.g., catalytic residue substitution) followed by enzyme assays |
| Can the enzyme be tagged for localization studies? | Knock-in of an epitope tag (e.g., FLAG, GFP) at the endogenous locus |
| Does overexpression change NADPH levels or stress tolerance? | CRISPR overexpression (e.g., promoter insertion) in a model organism |
| Which genes are co-regulated with the activity during infection? | Transcriptomic profiling of plant-microbe interactions |
| Can the activity be used for biocatalysis of aromatic aldehydes? | Heterologous expression in E. coli or yeast |
How to Study the aryl-alcohol dehydrogenase (NADP+) activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| NADPH absorbance assay (340 nm) | NADPH production or consumption | Enzyme kinetics and inhibitor testing |
| RNA-seq | Gene expression changes | Identifying oxidoreductase genes induced during infection |
| Proteomics / mass spectrometry | Protein identification and abundance | Purification of aryl-alcohol dehydrogenases |
| CRISPR knockout | Loss-of-function phenotype | Testing gene necessity for activity |
| CRISPR point mutation | Effect of specific amino acid changes | Active site and cofactor specificity studies |
| CRISPR knock-in (tag) | Protein localization and interactions | Live-cell imaging and immunoprecipitation |
| CRISPR overexpression | Gain-of-function phenotype | Testing sufficiency in redox balance |
| Enzyme-coupled assays | Cofactor regeneration | High-throughput screening |
Enzymatic assays for aryl-alcohol dehydrogenase (NADP+) activity
Direct measurement of GO:0047681 activity typically uses spectrophotometric assays monitoring NADPH formation at 340 nm, with an aromatic alcohol as substrate and NADP+ as cofactor. Such assays were used to characterize p-aminobenzyl alcohol dehydrogenase. Controls should include NAD+ to confirm NADP+ specificity.
Transcriptomics and gene expression analysis
RNA-seq or microarray studies can reveal expression changes in genes annotated with oxidoreductase activities, as demonstrated in perennial ryegrass during pink snow mould infection. Differential expression analysis can identify candidate genes for further functional characterization.
Proteomics and enzyme purification
Biochemical purification and mass spectrometry can identify proteins with aryl-alcohol dehydrogenase (NADP+) activity, as done for p-aminobenzyl alcohol dehydrogenase. Activity-guided fractionation is a classic approach.
Genetic and CRISPR-based perturbation
CRISPR knockout, point mutation, knock-in, and overexpression can be used to test the function of candidate genes in vivo. These approaches allow causal links between genotype and enzymatic activity to be established.
How CRISPR Can Be Used to Study GO:0047681 aryl-alcohol dehydrogenase (NADP+) activity
Knockout
CRISPR knockout of a candidate gene can abolish aryl-alcohol dehydrogenase (NADP+) activity, allowing researchers to test its role in aromatic metabolism and redox balance. In bacteria, knockout of p-aminobenzyl alcohol dehydrogenase would help define its contribution to p-aminobenzoic acid metabolism.
Point Mutation
CRISPR point mutation can introduce specific amino acid substitutions in the active site to test catalytic residues or cofactor specificity. For GO:0047681, mutating residues predicted to interact with NADP+ or the aromatic substrate can reveal structure-function relationships.
Knock-in
CRISPR knock-in of an epitope tag or fluorescent protein at the endogenous locus enables visualization and immunoprecipitation of the enzyme, facilitating studies of its localization and interaction partners. This is useful when specific antibodies are unavailable.
Overexpression
CRISPR overexpression, for example by inserting a strong promoter, can increase enzyme levels and test whether elevated activity alters NADPH pools, stress tolerance, or metabolic flux. Overexpression in a heterologous host can also provide enzyme for biochemical assays.
How EDITGENE Supports aryl-alcohol dehydrogenase (NADP+) activity Research
Researchers studying aryl-alcohol dehydrogenase (NADP+) activity-related genes often need to determine whether a candidate gene is causally involved in aromatic alcohol metabolism, redox balance, or stress responses. EDITGENE provides CRISPR-based cell model services to enable such functional studies with precision and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for aryl-alcohol dehydrogenase (NADP+) activity research.
Frequently Asked Questions About aryl-alcohol dehydrogenase (NADP+) activity
What is aryl-alcohol dehydrogenase (NADP+) activity?
It is a Gene Ontology molecular function (GO:0047681) that catalyzes the reversible reaction: an aromatic alcohol + NADP+ = an aromatic aldehyde + NADPH.
What genes are involved in aryl-alcohol dehydrogenase (NADP+) activity?
Genes encoding NADP+-dependent aryl-alcohol dehydrogenases, such as p-aminobenzyl alcohol dehydrogenase in bacteria, are directly involved. Plant oxidoreductase genes may also be related.
What is the GO ID for aryl-alcohol dehydrogenase (NADP+) activity?
The GO ID is GO:0047681.
What are the synonyms for GO:0047681?
Synonyms include aryl alcohol dehydrogenase (nicotinamide adenine dinucleotide phosphate), aryl-alcohol:NADP+ oxidoreductase activity, and NADPH-linked benzaldehyde reductase activity.
What reaction does aryl-alcohol dehydrogenase (NADP+) catalyze?
It catalyzes the oxidation of an aromatic alcohol to an aromatic aldehyde using NADP+ as the electron acceptor, producing NADPH; the reaction is reversible.
How can I measure aryl-alcohol dehydrogenase (NADP+) activity?
Spectrophotometric assays monitoring NADPH formation at 340 nm with an aromatic alcohol substrate and NADP+ are commonly used.
Is aryl-alcohol dehydrogenase (NADP+) activity linked to disease?
Direct links to human disease are not established in the available literature, but the activity contributes to microbial aromatic metabolism and redox balance.
What model systems are used to study GO:0047681?
Bacterial systems have been used for biochemical characterization, and plant-microbe interaction transcriptomics can reveal related gene expression changes.
Can CRISPR be used to study aryl-alcohol dehydrogenase (NADP+) activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression can be used to test gene function and enzyme mechanism.
What is the difference between NADP+ and NAD+ dependent aryl-alcohol dehydrogenases?
NADP+-dependent enzymes use NADP+ as cofactor (GO:0047681), while NAD+-dependent enzymes use NAD+; they are distinct activities.
Conclusion
Aryl-alcohol dehydrogenase (NADP+) activity (GO:0047681) is a well-defined molecular function that catalyzes the reversible interconversion of aromatic alcohols and aldehydes using NADP+/NADPH. Its biochemical characterization in bacteria, including p-aminobenzyl alcohol dehydrogenase, provides a foundation for understanding aromatic metabolism and redox balance. Transcriptomic studies in plants highlight that oxidoreductase genes can be dynamically expressed during infection, suggesting broader biological relevance. Continued research using CRISPR models and biochemical assays will further clarify the roles of this activity in health, disease, and biotechnology.
References
- 1. Kovi MR et al.. 2016. Global transcriptome changes in perennial ryegrass during early infection by pink snow mould.. Sci Rep 6:28702 PMID: 27346054
- 2. Sloane NH. 1973. Metabolites of p-aminobenzoic acid. V. Isolation and properties of p-aminobenzyl alcohol dehydrogenase.. Biochim Biophys Acta 327(1):11-9 PMID: 4149158
