GO:0004030 aldehyde dehydrogenase [NAD(P)+] activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004030 (aldehyde dehydrogenase [NAD(P)+] activity) catalyzes the NAD(P)+-dependent oxidation of an aldehyde to a carboxylic acid, producing NAD(P)H and H+.
• The term is a molecular_function in the Gene Ontology and is synonymous with aldehyde:NAD(P)+ oxidoreductase activity and ALDH.
• ALDH enzymes are central to alcohol metabolism, retinoic acid biosynthesis, and detoxification of reactive aldehydes [1,2].
• Altered ALDH activity has been reported in sera and tissues of patients with several cancers, including esophageal and liver cancer [3,7].
• ALDH activity correlates with oxidative stress markers in saliva of diabetic patients, suggesting a role in redox homeostasis.
• Gut bacteria and pancreatic tissue also express ALDH activity, expanding its biological and clinical relevance beyond the liver [5,6].
Description
Aldehyde dehydrogenase [NAD(P)+] activity (GO:0004030) is a molecular function that catalyzes the oxidation of an aldehyde to its corresponding acid using NAD+ or NADP+ as the electron acceptor, releasing NAD(P)H and a proton. This reaction is fundamental to cellular detoxification and to the generation of acidic metabolites and reducing equivalents. The enzyme family responsible, ALDH, is widely distributed across species and tissues, and its activity has been detected in human serum, pancreas, liver, and even in the normal flora of the large intestine [1,5,6]. Because aldehydes are highly reactive and can form adducts with proteins and DNA, efficient ALDH activity is critical for protecting cells from oxidative and carbonyl stress [1,2]. Researchers study GO:0004030 to understand metabolic pathways, cancer biology, stem cell properties, and disease-associated changes in enzyme activity [2,3,4]. The term is also relevant to clinical biochemistry, as altered ALDH activity in sera has been associated with esophageal, liver, and pancreatic diseases [3,6,7,8].
aldehyde dehydrogenase [NAD(P)+] activity At A Glance
| GO ID | GO:0004030 |
|---|---|
| GO term | aldehyde dehydrogenase [NAD(P)+] activity |
| Ontology | molecular_function |
| Synonym | aldehyde:NAD(P)+ oxidoreductase activity, ALDH |
| Definition | Catalysis of the reaction: an aldehyde + NAD(P)+ + H2O = an acid + NAD(P)H + H+ |
| Major function | Oxidation of aldehydes to carboxylic acids with concomitant reduction of NAD(P)+ |
| Cofactor | NAD+ or NADP+ |
| Substrates | Various aldehydes, including acetaldehyde and retinaldehyde |
| Products | Carboxylic acids, NAD(P)H, H+ |
| Related diseases | Cancer, diabetes, pancreatitis, liver disease |
What Is GO:0004030?
GO:0004030 describes the catalytic activity of an enzyme that converts an aldehyde substrate into an acid product. The reaction requires a water molecule and either NAD+ or NADP+ as a cofactor; the cofactor is reduced to NADH or NADPH, and a proton is released. In the Gene Ontology, this term is classified under molecular_function and is synonymous with aldehyde:NAD(P)+ oxidoreductase activity and ALDH. The definition is intentionally broad to encompass all enzymes that carry out this chemistry, regardless of substrate specificity or tissue distribution.
Why Is aldehyde dehydrogenase [NAD(P)+] activity Important in Cell Biology?
GO:0004030 is important because it represents a core metabolic reaction that protects cells from toxic aldehydes and contributes to key biosynthetic pathways. ALDH activity is essential for alcohol metabolism, where it converts acetaldehyde to acetate, and for the synthesis of retinoic acid, a critical signaling molecule in development and stem cell differentiation [1,2]. Dysregulated ALDH activity has been linked to multiple human diseases, including cancer, diabetes, and inflammatory conditions of the liver and pancreas [3,4,6,7,8]. Moreover, ALDH activity is a functional marker of stem cells and is often elevated in cancer stem cells, making it a target for research and therapeutic development.
• Detoxifies reactive aldehydes generated by alcohol metabolism, lipid peroxidation, and environmental exposure.
• Contributes to retinoic acid biosynthesis, influencing stem cell differentiation and development.
• Serves as a functional marker for stem cells and cancer stem cells.
• Altered serum ALDH activity is observed in esophageal cancer patients.
• Correlates with oxidative stress markers in diabetic saliva.
• Expressed by normal gut flora, affecting acetate production in the large intestine.
• Pancreatic ALDH activity changes in pancreatitis and pancreatic cancer [6,8].
• Liver cancer patients show altered ALDH activity in sera.
• Provides reducing equivalents (NADH/NADPH) for cellular antioxidant systems.
• Potential target for modulating drug resistance and cancer stem cell survival.
Mechanism, Genes and Research Methods of aldehyde dehydrogenase [NAD(P)+] activity
Substrate Binding and Cofactor Selection
In simple terms: The enzyme grabs an aldehyde molecule and a helper molecule called NAD+ or NADP+.
The reaction begins with the binding of an aldehyde substrate and either NAD+ or NADP+ to the active site of the ALDH enzyme. The choice of cofactor depends on the specific ALDH isoform and cellular context. This step is reversible and determines the overall catalytic efficiency.
Catalytic Oxidation and Product Release
In simple terms: The enzyme turns the aldehyde into an acid, releasing energy-rich NADH or NADPH.
Following binding, the enzyme catalyzes the oxidation of the aldehyde to a carboxylic acid. Water participates in the reaction, and NAD(P)+ is reduced to NAD(P)H, with a proton released. The acid product and reduced cofactor are then released, completing the catalytic cycle.
Tissue Distribution and Isoform Diversity
In simple terms: Different tissues have different versions of this enzyme, each tuned to local needs.
ALDH activity is found in many human tissues, including liver, pancreas, and serum. Isoforms differ in substrate specificity and cofactor preference. For example, pancreatic tissue expresses ALDH activity that can be measured in disease states. Gut bacteria also possess ALDH activity, contributing to acetate production in the colon.
Role in Oxidative Stress and Redox Balance
In simple terms: The reaction helps the cell manage oxidative stress by producing NADPH, a key antioxidant molecule.
The NAD(P)H generated by ALDH activity feeds into cellular antioxidant systems. In diabetic patients, ALDH activity in saliva correlates with oxidative stress markers, suggesting that the enzyme responds to redox imbalance. This link highlights the importance of ALDH in maintaining cellular homeostasis under stress conditions.
Key Genes Involved in GO:0004030 aldehyde dehydrogenase [NAD(P)+] activity
The following genes encode enzymes with aldehyde dehydrogenase [NAD(P)+] activity or are directly associated with this function in human biology and disease.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ALDH1A1 | Retinaldehyde dehydrogenase, stem cell marker | Cancer stem cells, retinoic acid synthesis |
| ALDH2 | Mitochondrial acetaldehyde dehydrogenase | Alcohol metabolism, esophageal cancer risk [1,3] |
| ALDH1B1 | Mitochondrial aldehyde dehydrogenase | Liver and pancreatic function [6,7] |
| ALDH3A1 | Cytosolic aldehyde dehydrogenase | Oxidative stress response, corneal protection |
| ALDH1A2 | Retinaldehyde dehydrogenase | Embryonic development, retinoic acid signaling |
| ALDH1A3 | Retinaldehyde dehydrogenase | Cancer stem cell maintenance |
| ALDH5A1 | Succinic semialdehyde dehydrogenase | Neurotransmitter metabolism |
| ALDH6A1 | Methylmalonate semialdehyde dehydrogenase | Valine and pyrimidine metabolism |
| ALDH7A1 | Antiquitin, alpha-aminoadipic semialdehyde dehydrogenase | Lysine metabolism, epilepsy |
| ALDH9A1 | Gamma-aminobutyraldehyde dehydrogenase | Polyamine metabolism |
| ALDH18A1 | Delta-1-pyrroline-5-carboxylate synthase | Proline biosynthesis |
| ALDH4A1 | Pyrroline-5-carboxylate dehydrogenase | Proline degradation |
| ALDH16A1 | Uncharacterized aldehyde dehydrogenase | Potential metabolic roles |
| ALDH3B1 | Lipid aldehyde dehydrogenase | Detoxification of lipid peroxidation products |
| ALDH3B2 | Lipid aldehyde dehydrogenase | Detoxification, tissue-specific expression |
| ALDH8A1 | Retinaldehyde dehydrogenase | Retinoic acid synthesis |
| ALDH1L1 | 10-formyltetrahydrofolate dehydrogenase | Folate metabolism |
How Is aldehyde dehydrogenase [NAD(P)+] activity Regulated?
The activity of aldehyde dehydrogenase [NAD(P)+] is regulated at multiple levels. Transcriptional regulation controls the expression of ALDH genes in response to developmental cues, xenobiotics, and oxidative stress [1,2]. Post-translational modifications, such as phosphorylation and acetylation, can modulate enzyme activity. Additionally, the availability of NAD+ and NADP+ cofactors influences the reaction rate, linking ALDH activity to cellular metabolic state. In cancer, ALDH1A1 expression is often upregulated and associated with stem cell properties, suggesting regulation by stemness-related signaling pathways.
aldehyde dehydrogenase [NAD(P)+] activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ALDH1A1 | Cancer stem cells, therapy resistance | Knockout and overexpression in cancer cell lines |
| ALDH2 | Esophageal cancer, alcohol metabolism | Point mutation (e.g., ALDH2*2) knock-in mice [1,3] |
| ALDH1B1 | Pancreatic and liver cancer | Knockout in pancreatic cell lines [6,7] |
| ALDH3A1 | Oxidative stress-related diseases | Overexpression in epithelial cells |
| ALDH7A1 | Epilepsy, lysine metabolism | Knockout zebrafish or mouse models |
Cancer and ALDH Activity
Altered aldehyde dehydrogenase activity has been reported in several cancers. In esophageal cancer, serum ALDH activity is significantly changed compared to healthy controls. Liver cancer patients also show altered ALDH activity in sera, suggesting potential as a biomarker. ALDH1A1 is a well-known marker of cancer stem cells and contributes to therapy resistance in multiple tumor types.
Diabetes and Oxidative Stress
In diabetic patients, salivary ALDH activity correlates with oxidative stress markers, indicating that the enzyme may be involved in the systemic response to hyperglycemia-induced oxidative damage. This suggests that ALDH activity could serve as a non-invasive biomarker for oxidative stress in diabetes.
Pancreatic and Liver Diseases
Pancreatic ALDH activity is detectable in human pancreas, and changes in activity have been observed in pancreatitis and pancreatic cancer [6,8]. Similarly, liver cancer is associated with altered serum ALDH activity. These findings highlight the clinical relevance of ALDH in gastrointestinal and hepatobiliary diseases.
Gut Microbiome and Acetate Production
Aerobic bacteria of the normal human large intestine express ALDH activity and produce acetate, which can influence host metabolism and gut health. This microbial ALDH activity represents an additional layer of complexity in host-microbe interactions.
From aldehyde dehydrogenase [NAD(P)+] activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does ALDH1A1 loss reduce cancer stem cell self-renewal? | ALDH1A1 knockout in cancer cell lines |
| How does ALDH2 point mutation affect acetaldehyde clearance? | ALDH2*2 knock-in mice |
| Can ALDH activity be used as a biomarker in diabetes? | Overexpression of ALDH in salivary gland cells |
| What is the role of gut bacterial ALDH in acetate production? | Knockout of bacterial ALDH genes in culture |
| Does ALDH1B1 knockout alter pancreatic cancer growth? | ALDH1B1 knockout in pancreatic cancer xenografts |
| How does ALDH3A1 protect against lipid peroxidation? | ALDH3A1 overexpression in lung epithelial cells |
How to Study the aldehyde dehydrogenase [NAD(P)+] activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Spectrophotometric assay | NAD(P)H production at 340 nm | Quantifying ALDH activity in serum or tissue [3,6,7] |
| qRT-PCR | mRNA expression of ALDH genes | Comparing expression across disease states |
| RNA-seq | Global transcriptome changes | Identifying pathways linked to ALDH activity |
| Aldefluor assay | Cellular ALDH activity by flow cytometry | Isolating stem cells and cancer stem cells |
| CRISPR knockout | Loss of ALDH gene function | Testing causal roles in disease models [1,2] |
| CRISPR knock-in | Introduction of specific mutations | Modeling ALDH2*2 polymorphism |
| Western blot | Protein expression levels | Validating knockout or overexpression |
| Immunohistochemistry | Tissue distribution of ALDH proteins | Localizing ALDH in tumor sections |
Enzymatic Activity Assays
Aldehyde dehydrogenase activity is commonly measured spectrophotometrically by monitoring the reduction of NAD(P)+ to NAD(P)H at 340 nm. This method has been used to quantify ALDH activity in serum, saliva, and tissue homogenates from patients with cancer, diabetes, and pancreatitis [3,4,6,7,8].
Gene Expression Analysis
Quantitative RT-PCR and RNA-seq can measure the expression levels of ALDH genes in cells and tissues. These methods help link transcriptional changes to enzyme activity and disease states.
CRISPR-Cas9 Knockout and Knock-in Models
CRISPR-Cas9 technology enables the generation of ALDH knockout cell lines and knock-in models carrying specific point mutations, such as ALDH2*2. These models are valuable for studying the causal role of ALDH activity in disease [1,2].
Flow Cytometry and Aldefluor Assay
The Aldefluor assay uses a fluorescent ALDH substrate to identify cells with high ALDH activity by flow cytometry. This technique is widely used to isolate stem cells and cancer stem cells based on ALDH activity.
How CRISPR Can Be Used to Study GO:0004030 aldehyde dehydrogenase [NAD(P)+] activity
Knockout
CRISPR-Cas9 knockout of ALDH genes, such as ALDH1A1 or ALDH2, allows researchers to eliminate enzyme activity and study its consequences in cell models. This approach has been used to demonstrate the role of ALDH1A1 in cancer stem cell maintenance and to model alcohol metabolism defects.
Point Mutation
Point mutations in ALDH genes, such as the ALDH2*2 variant, can be introduced using CRISPR-Cas9 homology-directed repair. These models mimic human polymorphisms and help understand their impact on enzyme activity and disease susceptibility.
Knock-in
Knock-in of reporter tags or epitope tags into endogenous ALDH loci enables real-time tracking of enzyme expression and localization. This is useful for studying ALDH dynamics in living cells.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression can increase ALDH activity in cells. Overexpression models are used to test whether elevated ALDH activity promotes stemness, drug resistance, or protection against oxidative stress.
How EDITGENE Supports aldehyde dehydrogenase [NAD(P)+] activity Research
Researchers studying aldehyde dehydrogenase [NAD(P)+] activity-related genes often need to determine whether a candidate gene is causally involved in a specific disease or cellular process. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research, from knockout to precise point mutations and library screening.
Contact EDITGENE today to design your custom CRISPR model for aldehyde dehydrogenase [NAD(P)+] activity research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| ALDH3B2 Knockout HEK293 Cell Line | EDJ-KQ2545 | Human | 222 | Details Get a Quote |
| ALDH3A1 Knockout HEK293 Cell Line | EDJ-KQ3442 | Human | 218 | Details Get a Quote |
| ALDH1A3 Knockout HEK293 Cell Line | EDJ-KQ4033 | Human | 220 | Details Get a Quote |
| ALDH3B1 Knockout HEK293 Cell Line | EDJ-KQ4039 | Human | 221 | Details Get a Quote |
| ALDH2 Knockout HEK293 Cell Line | EDJ-KQ12328 | Human | 217 | Details Get a Quote |
| ALDH1A3 Knockout HCT 116 Cell Line | EDJ-KQ25041 | Human | 220 | Details Get a Quote |
| ALDH3A1 Knockout A-549 Cell Line | EDJ-KQ25173 | Human | 218 | Details Get a Quote |
| ALDH3A1 Knockout HCT 116 Cell Line | EDJ-KQ25174 | Human | 218 | Details Get a Quote |
| ALDH3A1 Knockout HeLa Cell Line | EDJ-KQ25175 | Human | 218 | Details Get a Quote |
| ALDH2 Knockout A-549 Cell Line | EDJ-KQ41173 | Human | 217 | Details Get a Quote |
| ALDH2 Knockout HCT 116 Cell Line | EDJ-KQ41174 | Human | 217 | Details Get a Quote |
| ALDH2 Knockout HeLa Cell Line | EDJ-KQ41175 | Human | 217 | Details Get a Quote |
| ALDH1A3 Knockout A-549 Cell Line | EDJ-KQ26379 | Human | 220 | Details Get a Quote |
| ALDH1A3 Knockout HeLa Cell Line | EDJ-KQ26380 | Human | 220 | Details Get a Quote |
| ALDH3B1 Knockout A-549 Cell Line | EDJ-KQ26387 | Human | 221 | Details Get a Quote |
Displaying Records 1 To 15 Of 22 Records
Frequently Asked Questions About aldehyde dehydrogenase [NAD(P)+] activity
What is aldehyde dehydrogenase [NAD(P)+] activity?
It is a molecular function (GO:0004030) that catalyzes the oxidation of an aldehyde to an acid using NAD+ or NADP+ as a cofactor, producing NAD(P)H and H+.
What genes are involved in aldehyde dehydrogenase [NAD(P)+] activity?
Genes encoding ALDH enzymes include ALDH1A1, ALDH2, ALDH1B1, ALDH3A1, and many others, each with specific roles in metabolism and disease [1,2].
How is aldehyde dehydrogenase activity measured?
It is commonly measured by spectrophotometric assays that monitor NAD(P)H production at 340 nm, or by flow cytometry using the Aldefluor assay [2,3].
What diseases are associated with altered ALDH activity?
Altered ALDH activity has been reported in esophageal cancer, liver cancer, pancreatitis, and diabetes, among others [3,4,6,7,8].
What is the role of ALDH in cancer stem cells?
ALDH1A1 is a functional marker of cancer stem cells and contributes to therapy resistance and tumor initiation.
Can CRISPR be used to study ALDH genes?
Yes, CRISPR-Cas9 knockout, point mutation, and knock-in models are widely used to study the function of ALDH genes in cells and animals [1,2].
What is the ALDH2*2 mutation?
ALDH2*2 is a common point mutation that reduces aldehyde dehydrogenase activity, leading to impaired acetaldehyde clearance and increased cancer risk.
How does ALDH activity relate to oxidative stress?
ALDH activity generates NADPH, which helps maintain cellular antioxidant defenses; it correlates with oxidative stress markers in diabetic patients.
Do gut bacteria have aldehyde dehydrogenase activity?
Yes, aerobic bacteria of the normal human large intestine express ALDH activity and produce acetate.
What services does EDITGENE offer for ALDH research?
EDITGENE provides knockout, point mutation, knock-in, overexpression cell models, CRISPR library screening, and bioinformatics services for ALDH-related genes.
Conclusion
Aldehyde dehydrogenase [NAD(P)+] activity (GO:0004030) is a fundamental molecular function with broad implications for metabolism, detoxification, and disease. Its role in cancer, diabetes, and gastrointestinal disorders makes it a compelling target for research. By leveraging CRISPR-based models and advanced bioinformatics, researchers can dissect the precise contributions of ALDH genes to health and disease. EDITGENE stands ready to support these efforts with tailored gene editing services.
References
- 1. Ehrig T et al.. 1990. Alcohol and aldehyde dehydrogenase.. Alcohol Alcohol 25(2-3):105-16 PMID: 2198030
- 2. Tomita H et al.. 2016. Aldehyde dehydrogenase 1A1 in stem cells and cancer.. Oncotarget 7(10):11018-32 PMID: 26783961
- 3. Jelski W et al.. 2009. Alcohol dehydrogenase isoenzymes and aldehyde dehydrogenase activity in the sera of patients with esophageal cancer.. Clin Exp Med 9(2):131-7 PMID: 19184326
- 4. Younus H et al.. 2020. Correlation between the Activity of Aldehyde Dehydrogenase and Oxidative Stress Markers in the Saliva of Diabetic Patients.. Protein Pept Lett 27(1):67-73 PMID: 31577196
- 5. Nosova T et al.. 1996. Aldehyde dehydrogenase activity and acetate production by aerobic bacteria representing the normal flora of human large intestine.. Alcohol Alcohol 31(6):555-64 PMID: 9010546
- 6. Chrostek L et al.. 2003. Alcohol dehydrogenase (ADH) isoenzymes and aldehyde dehydrogenase (ALDH) activity in the human pancreas.. Dig Dis Sci 48(7):1230-3 PMID: 12870777
- 7. Jelski W et al.. 2008. Alcohol dehydrogenase (ADH) isoenzymes and aldehyde dehydrogenase (ALDH) activity in the sera of patients with liver cancer.. J Clin Lab Anal 22(3):204-9 PMID: 18484658
- 8. Jelski W et al.. 2011. Alcohol dehydrogenase (ADH) isoenzymes and aldehyde dehydrogenase (ALDH) activity in the sera of patients with acute and chronic pancreatitis.. Exp Mol Pathol 91(2):631-5 PMID: 21798257
