GO:0018455 alcohol dehydrogenase [NAD(P)+] activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0018455 describes alcohol dehydrogenase [NAD(P)+] activity, the reversible oxidation of an alcohol to an aldehyde or ketone using NAD+ or NADP+ as cofactor.
• This activity is central to ethanol metabolism and to the hepatic and gastric first-pass oxidation of alcohol.
• Altered alcohol dehydrogenase activity has been reported in hepatic fibrogenesis, liver cancer, esophageal cancer and pancreatic disease.
• Gene polymorphisms and metabolic activity of alcohol dehydrogenase influence prognosis in hepatocellular carcinoma patients.
• The reaction is NAD(P)+-dependent and produces NAD(P)H, linking redox balance to aldehyde/ketone production.
• CRISPR knockout, point-mutation, knock-in and overexpression models allow causal testing of alcohol dehydrogenase [NAD(P)+] activity in disease.
Description
GO:0018455, alcohol dehydrogenase [NAD(P)+] activity, is a molecular function defined by the catalysis of the reaction an alcohol + NAD(P)+ = an aldehyde or ketone + NAD(P)H + H+. This activity is one of the principal enzymatic routes for the oxidative conversion of alcohols, and it is especially well studied in the context of ethanol metabolism, where alcohol dehydrogenase initiates the conversion of ethanol to acetaldehyde. Because the reaction uses NAD+ or NADP+ as an electron acceptor, it directly couples substrate oxidation to cellular redox state. For researchers, GO:0018455 matters because changes in alcohol dehydrogenase activity have been associated with human disease. Higher alcohol dehydrogenase activity has been correlated with hepatic fibrogenesis, and alcohol dehydrogenase isoenzyme activity has been examined in pancreatic disease, gastric tissue, esophageal cancer and liver cancer. In hepatocellular carcinoma, gene polymorphisms, metabolic activity and content of alcohol dehydrogenase and acetaldehyde dehydrogenases have been linked to patient prognosis. These findings make GO:0018455 a relevant functional annotation for studies of alcohol-related pathology, redox biology and cancer. This article summarizes the QuickGO definition and the verified literature on alcohol dehydrogenase [NAD(P)+] activity, then outlines how CRISPR-based cell models and functional genomics methods can be used to study the genes that carry this activity.
alcohol dehydrogenase [NAD(P)+] activity At A Glance
| GO ID | GO:0018455 |
|---|---|
| GO term | alcohol dehydrogenase [NAD(P)+] activity |
| Ontology | molecular_function |
| Synonym | alcohol:NAD(P)+ oxidoreductase activity; aldehyde reductase (NADPH/NADH) |
| Major function | Catalysis of the reversible oxidation of an alcohol to an aldehyde or ketone using NAD(P)+ as cofactor |
| Reaction direction | Alcohol + NAD(P)+ = aldehyde or ketone + NAD(P)H + H+ |
| Cofactor | NAD+ or NADP+ |
| Physiological context | Ethanol metabolism and hepatic/gastric first-pass alcohol oxidation |
| Disease relevance | Hepatic fibrogenesis, liver cancer, esophageal cancer, pancreatic disease and hepatocellular carcinoma prognosis |
What Is GO:0018455?
In simple terms, GO:0018455 is the enzyme activity that removes hydrogens from an alcohol and transfers them to NAD+ or NADP+, producing an aldehyde or ketone plus NAD(P)H and a proton. The official QuickGO definition is: Catalysis of the reaction: an alcohol + NAD(P)+ = an aldehyde or ketone + NAD(P)H + H+. The term is a molecular_function annotation and includes the synonym alcohol:NAD(P)+ oxidoreductase activity, as well as aldehyde reductase (NADPH/NADH).
Why Is alcohol dehydrogenase [NAD(P)+] activity Important in Cell Biology?
GO:0018455 is important because alcohol dehydrogenase [NAD(P)+] activity sits at the interface of alcohol metabolism, redox homeostasis and disease. It catalyzes the first oxidative step in ethanol clearance and generates acetaldehyde, a reactive intermediate. In human studies, alcohol dehydrogenase activity has been correlated with hepatic fibrogenesis, and isoenzyme activity has been measured in pancreatic tissue, gastric mucosa, esophageal cancer sera and liver cancer sera. In hepatocellular carcinoma, alcohol dehydrogenase gene polymorphisms, metabolic activity and content have been associated with prognosis. These observations make GO:0018455 a useful annotation for mechanistic and translational research.
• It defines the NAD(P)+-dependent oxidation of alcohols to aldehydes or ketones, a core redox reaction.
• It is a key activity in ethanol metabolism and the production of acetaldehyde.
• Higher alcohol dehydrogenase activity has been correlated with hepatic fibrogenesis.
• Alcohol dehydrogenase isoenzyme activity has been studied in human pancreas.
• Gastric alcohol dehydrogenase activity varies with age, sex and alcoholism.
• Alcohol dehydrogenase isoenzyme activity has been examined in esophageal cancer sera.
• Alcohol dehydrogenase isoenzyme activity has been examined in liver cancer sera.
• Gene polymorphisms and metabolic activity of alcohol dehydrogenase are associated with hepatocellular carcinoma prognosis.
• The activity links alcohol exposure to NAD(P)H production and cellular redox changes.
• It provides a functional readout for CRISPR models targeting alcohol dehydrogenase genes.
What Happens During alcohol dehydrogenase [NAD(P)+] activity?
Substrate binding and cofactor selection
In simple terms: The enzyme first grabs the alcohol and either NAD+ or NADP+.
Alcohol dehydrogenase [NAD(P)+] activity begins with binding of an alcohol substrate and an NAD+ or NADP+ cofactor. The use of NAD(P)+ as the electron acceptor distinguishes this activity and links it to cellular redox pools. In ethanol metabolism, this step initiates the conversion of ethanol to acetaldehyde.
Hydride transfer and alcohol oxidation
In simple terms: The enzyme removes hydrogen from the alcohol and hands it to the cofactor.
During catalysis, hydride transfer from the alcohol to NAD(P)+ oxidizes the alcohol to an aldehyde or ketone while generating NAD(P)H and a proton. This reversible redox step is the chemical core of GO:0018455. The resulting aldehyde or ketone can then enter downstream metabolic or detoxification pathways.
NAD(P)H production and redox coupling
In simple terms: The reaction produces NAD(P)H, which the cell can use elsewhere.
The reaction produces NAD(P)H and H+, coupling alcohol oxidation to the cellular redox state. Because NAD(P)H is a central reducing equivalent, changes in alcohol dehydrogenase [NAD(P)+] activity can influence redox-dependent processes. This coupling is relevant to ethanol metabolism and to hepatic metabolic effects of ethanol.
Tissue-specific isoenzyme activity
In simple terms: Different tissues show different levels of this activity.
Alcohol dehydrogenase isoenzyme activity has been measured in human pancreas, gastric mucosa, esophageal cancer sera and liver cancer sera. Gastric alcohol dehydrogenase activity is affected by age, sex and alcoholism. These tissue-specific patterns indicate that GO:0018455 is not uniform across human tissues.
Association with hepatic fibrogenesis
In simple terms: Higher activity of this enzyme has been linked to liver scarring.
Higher activity of alcohol dehydrogenase has been correlated with hepatic fibrogenesis. This observation links GO:0018455 to a fibrotic liver phenotype. It also supports the use of alcohol dehydrogenase activity as a research readout in liver disease models.
Key Genes Involved in GO:0018455 alcohol dehydrogenase [NAD(P)+] activity
The following genes and proteins are directly relevant to alcohol dehydrogenase [NAD(P)+] activity and its study in human disease, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ADH1 | Alcohol dehydrogenase isoenzyme contributing to alcohol oxidation | Studied in ethanol metabolism and tissue-specific alcohol dehydrogenase activity |
| ADH2 | Alcohol dehydrogenase isoenzyme contributing to alcohol oxidation | Studied in ethanol metabolism and alcohol-related pathology |
| ADH3 | Alcohol dehydrogenase isoenzyme contributing to alcohol oxidation | Studied in ethanol metabolism and alcohol-related pathology |
| ADH4 | Alcohol dehydrogenase isoenzyme contributing to alcohol oxidation | Studied in ethanol metabolism and alcohol-related pathology |
| ADH5 | Alcohol dehydrogenase isoenzyme contributing to alcohol oxidation | Studied in ethanol metabolism and alcohol-related pathology |
| ADH6 | Alcohol dehydrogenase isoenzyme contributing to alcohol oxidation | Studied in ethanol metabolism and alcohol-related pathology |
| ADH7 | Alcohol dehydrogenase isoenzyme contributing to alcohol oxidation | Studied in ethanol metabolism and alcohol-related pathology |
| ALDH1 | Aldehyde dehydrogenase acting downstream of alcohol dehydrogenase | Studied together with alcohol dehydrogenase in pancreas and liver cancer |
| ALDH2 | Aldehyde dehydrogenase acting downstream of alcohol dehydrogenase | Studied together with alcohol dehydrogenase in pancreas and liver cancer |
| ALDH3 | Aldehyde dehydrogenase acting downstream of alcohol dehydrogenase | Studied together with alcohol dehydrogenase in pancreas and liver cancer |
| ADH (pancreatic isoenzymes) | Alcohol dehydrogenase isoenzymes in pancreas | Measured in human pancreatic tissue |
| ADH (gastric activity) | Alcohol dehydrogenase activity in gastric mucosa | Measured with respect to age, sex and alcoholism |
| ADH (serum isoenzymes) | Alcohol dehydrogenase isoenzymes in serum | Measured in esophageal cancer patients |
| ADH (serum isoenzymes) | Alcohol dehydrogenase isoenzymes in serum | Measured in liver cancer patients |
| ADH (hepatic activity) | Alcohol dehydrogenase activity in liver | Correlated with hepatic fibrogenesis |
| ADH (HCC prognostic marker) | Alcohol dehydrogenase gene polymorphisms and metabolic activity | Associated with hepatocellular carcinoma prognosis |
| NAD(P)+ pool | Cofactor supply for the reaction | Relevant to redox coupling of GO:0018455 |
| Acetaldehyde | Product of ethanol oxidation by alcohol dehydrogenase | Central intermediate in ethanol metabolism |
How Is alcohol dehydrogenase [NAD(P)+] activity Regulated?
Alcohol dehydrogenase [NAD(P)+] activity is influenced by tissue context and by host factors. Gastric alcohol dehydrogenase activity has been reported to vary with age, sex and alcoholism. In liver, higher alcohol dehydrogenase activity has been correlated with hepatic fibrogenesis. In hepatocellular carcinoma, gene polymorphisms, metabolic activity and content of alcohol dehydrogenase and acetaldehyde dehydrogenases have been associated with prognosis. These findings indicate that regulation of GO:0018455 is multifactorial and includes genetic, demographic and disease-related components.
alcohol dehydrogenase [NAD(P)+] activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ADH (hepatic activity) | Hepatic fibrogenesis | Knockout or overexpression in hepatic cell lines followed by activity assay |
| ADH (HCC prognostic marker) | Hepatocellular carcinoma prognosis | Point-mutation or knock-in of polymorphism in liver cancer cell lines |
| ADH (serum isoenzymes) | Liver cancer | Overexpression and secreted activity measurement in hepatoma cells |
| ADH (serum isoenzymes) | Esophageal cancer | Knockout and activity assay in esophageal cell lines |
| ADH (pancreatic isoenzymes) | Pancreatic disease | Knockout and isoenzyme activity profiling in pancreatic cells |
Alcohol dehydrogenase [NAD(P)+] activity in liver disease
Higher activity of alcohol dehydrogenase has been correlated with hepatic fibrogenesis. Hepatic and metabolic effects of ethanol are well documented, and alcohol dehydrogenase initiates ethanol oxidation in the liver. In liver cancer sera, alcohol dehydrogenase isoenzyme activity has been measured together with aldehyde dehydrogenase activity. These observations connect GO:0018455 to liver pathology and to ethanol-related hepatic injury.
Alcohol dehydrogenase [NAD(P)+] activity in hepatocellular carcinoma
In hepatocellular carcinoma patients, gene polymorphisms, metabolic activity and content of alcohol dehydrogenase and acetaldehyde dehydrogenases have been associated with prognosis. This suggests that alcohol dehydrogenase [NAD(P)+] activity may be a relevant functional axis in liver cancer outcome. The same activity has been linked to hepatic fibrogenesis, a known risk context for liver disease.
Alcohol dehydrogenase [NAD(P)+] activity in pancreatic and esophageal disease
Alcohol dehydrogenase isoenzymes and aldehyde dehydrogenase activity have been examined in the human pancreas. Alcohol dehydrogenase isoenzyme activity has also been measured in the sera of patients with esophageal cancer. These studies extend the disease relevance of GO:0018455 beyond the liver to pancreatic and esophageal contexts.
Alcohol dehydrogenase [NAD(P)+] activity and gastric alcohol metabolism
Human gastric alcohol dehydrogenase activity is affected by age, sex and alcoholism. This indicates that the first-pass metabolism of alcohol in the stomach is variable across individuals. Because gastric alcohol dehydrogenase contributes to ethanol metabolism, changes in this activity may influence systemic alcohol exposure.
From alcohol dehydrogenase [NAD(P)+] activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of alcohol dehydrogenase [NAD(P)+] activity change ethanol oxidation? | CRISPR knockout of the target ADH gene in a hepatic cell line |
| Does a polymorphism alter catalytic activity? | CRISPR point mutation or knock-in of the variant in a cell line |
| Does tagged enzyme localization change with disease state? | Tagged knock-in of the ADH gene |
| Does increased enzyme abundance drive fibrogenic phenotypes? | Overexpression of the ADH gene in hepatic cells |
| Does the enzyme contribute to cancer cell redox balance? | Knockout plus NAD(P)H measurement in cancer cell lines |
| Does tissue-specific isoenzyme activity depend on a specific gene? | Isoform-specific knockout in pancreatic or gastric cells |
How to Study the alcohol dehydrogenase [NAD(P)+] activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| NAD(P)H-coupled activity assay | Rate of alcohol oxidation | Comparing alcohol dehydrogenase activity across samples |
| Isoenzyme profiling | Relative activity of alcohol dehydrogenase isoenzymes | Pancreas, serum and tissue studies |
| Gene polymorphism analysis | Genotype of alcohol dehydrogenase variants | Hepatocellular carcinoma prognosis studies |
| Gastric activity measurement | Alcohol dehydrogenase activity in gastric mucosa | Studies of age, sex and alcoholism |
| Serum activity measurement | Circulating alcohol dehydrogenase isoenzyme activity | Esophageal and liver cancer patient samples |
| CRISPR knockout | Loss-of-function effect on activity and phenotype | Causal testing of ADH genes |
| CRISPR point mutation or knock-in | Effect of a specific variant on activity | Functional validation of polymorphisms |
| Overexpression | Gain-of-function effect on activity and phenotype | Modeling increased alcohol dehydrogenase activity |
Enzymatic activity assays
Alcohol dehydrogenase [NAD(P)+] activity can be measured by monitoring NAD(P)H production from alcohol and NAD(P)+. Such assays have been used to compare activity in hepatic fibrogenesis and in tissue samples. They are also used to profile isoenzyme activity in pancreas, serum and gastric tissue.
Isoenzyme and polymorphism analysis
Because alcohol dehydrogenase exists as multiple isoenzymes, activity measurements are often combined with isoenzyme profiling. Gene polymorphism analysis has been used in hepatocellular carcinoma to relate genotype to metabolic activity and prognosis. These approaches help distinguish which gene product contributes to GO:0018455 in a given sample.
Tissue and serum profiling
Alcohol dehydrogenase activity has been measured in human pancreas, gastric mucosa, liver and serum. Serum measurements in esophageal and liver cancer patients illustrate the use of accessible samples for activity profiling. Gastric activity measurements show how demographic and behavioral factors can be incorporated into study design.
CRISPR functional genomics
CRISPR knockout, point mutation, knock-in and overexpression can be used to test causality of alcohol dehydrogenase genes in disease phenotypes. Knockout models can reveal whether loss of activity changes ethanol oxidation or redox state. Point-mutation and knock-in models can test the functional impact of polymorphisms associated with hepatocellular carcinoma prognosis.
How CRISPR Can Be Used to Study GO:0018455 alcohol dehydrogenase [NAD(P)+] activity
Knockout
CRISPR knockout of an alcohol dehydrogenase gene can eliminate alcohol dehydrogenase [NAD(P)+] activity and reveal its contribution to ethanol oxidation and disease phenotypes. Knockout models are useful for testing whether loss of activity changes hepatic fibrogenesis-related readouts. They can also be used in cancer cell lines to test redox and survival effects.
Point Mutation
CRISPR point mutation can introduce a specific variant into an alcohol dehydrogenase gene to test its effect on catalytic activity. This is relevant because gene polymorphisms of alcohol dehydrogenase have been associated with hepatocellular carcinoma prognosis. Point-mutation models allow controlled comparison of variant and wild-type activity.
Knock-in
CRISPR knock-in can add a tag or a disease-associated allele to an alcohol dehydrogenase gene for localization and functional studies. Tagged knock-in enables tracking of the enzyme in tissue-specific contexts such as pancreas or liver. Knock-in of a polymorphism can model the genotype-prognosis relationship observed in hepatocellular carcinoma.
Overexpression
CRISPR overexpression can increase alcohol dehydrogenase [NAD(P)+] activity to test gain-of-function phenotypes. This is relevant because higher alcohol dehydrogenase activity has been correlated with hepatic fibrogenesis. Overexpression models can also be used to study redox changes driven by increased NAD(P)H production.
How EDITGENE Supports alcohol dehydrogenase [NAD(P)+] activity Research
Researchers studying alcohol dehydrogenase [NAD(P)+] activity-related genes often need to determine whether a candidate gene is causally involved in a disease phenotype, such as hepatic fibrogenesis or hepatocellular carcinoma prognosis. EDITGENE provides CRISPR-based cell model services that allow such causal questions to be addressed directly in relevant cell backgrounds.
Contact EDITGENE today to design your custom CRISPR model for alcohol dehydrogenase [NAD(P)+] activity research.
Frequently Asked Questions About alcohol dehydrogenase [NAD(P)+] activity
What is alcohol dehydrogenase [NAD(P)+] activity?
It is the enzyme activity defined by GO:0018455 that catalyzes the reaction an alcohol + NAD(P)+ = an aldehyde or ketone + NAD(P)H + H+.
What genes are involved in alcohol dehydrogenase [NAD(P)+] activity?
Alcohol dehydrogenase isoenzymes and aldehyde dehydrogenases are involved, and their activity has been studied in pancreas, gastric tissue, serum and liver.
What is the GO ID for alcohol dehydrogenase [NAD(P)+] activity?
The GO ID is GO:0018455.
Why is alcohol dehydrogenase [NAD(P)+] activity important in liver disease?
Higher alcohol dehydrogenase activity has been correlated with hepatic fibrogenesis, and isoenzyme activity has been measured in liver cancer sera.
How is alcohol dehydrogenase [NAD(P)+] activity measured?
It is commonly measured by NAD(P)H-coupled activity assays and isoenzyme profiling in tissue or serum samples.
Does alcohol dehydrogenase [NAD(P)+] activity change with age or sex?
Human gastric alcohol dehydrogenase activity has been reported to be affected by age, sex and alcoholism.
Is alcohol dehydrogenase [NAD(P)+] activity linked to cancer prognosis?
In hepatocellular carcinoma, gene polymorphisms, metabolic activity and content of alcohol dehydrogenase and acetaldehyde dehydrogenases have been associated with prognosis.
What cofactor does alcohol dehydrogenase [NAD(P)+] activity use?
The reaction uses NAD+ or NADP+ as the electron acceptor and produces NAD(P)H and H+.
Can CRISPR be used to study alcohol dehydrogenase [NAD(P)+] activity?
Yes, CRISPR knockout, point mutation, knock-in and overexpression can be used to test the causal role of alcohol dehydrogenase genes.
What diseases are associated with alcohol dehydrogenase [NAD(P)+] activity?
Reported associations include hepatic fibrogenesis, liver cancer, esophageal cancer, pancreatic disease and hepatocellular carcinoma prognosis.
Conclusion
GO:0018455, alcohol dehydrogenase [NAD(P)+] activity, defines a central NAD(P)+-dependent redox reaction that converts alcohols to aldehydes or ketones. It is closely tied to ethanol metabolism and has been associated with hepatic fibrogenesis, liver cancer, esophageal cancer, pancreatic disease and hepatocellular carcinoma prognosis. Because the activity is measurable and genetically tractable, CRISPR-based knockout, point-mutation, knock-in and overexpression models offer a direct route to test causality and to connect genotype to function in disease-relevant cells.
References
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- 3. 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
- 4. Seitz HK et al.. 1993. Human gastric alcohol dehydrogenase activity: effect of age, sex, and alcoholism.. Gut 34(10):1433-7 PMID: 8244116
- 5. 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
- 6. Lieber CS. 1994. Hepatic and metabolic effects of ethanol: pathogenesis and prevention.. Ann Med 26(5):325-30 PMID: 7826592
- 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. Gao N et al.. 2022. Effects of Gene Polymorphisms, Metabolic Activity, and Content of Alcohol Dehydrogenase and Acetaldehyde Dehydrogenases on Prognosis of Hepatocellular Carcinoma Patients.. Turk J Gastroenterol 33(7):606-614 PMID: 35879918
