GO:0034979 NAD-dependent protein lysine deacetylase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0034979 describes the enzymatic activity that removes acetyl groups from lysine residues on proteins using NAD+ as a co-substrate, producing nicotinamide and 2''-O-acetyl-ADP-ribose.
• This activity is carried out by sirtuins (SIRT1-7 in mammals), a conserved family of NAD+-dependent deacetylases and deacylases.
• Sirtuins regulate diverse biological processes including mitochondrial fatty-acid oxidation, inflammation, metabolism, and tumorigenesis.
• Some sirtuins, such as SIRT5, exhibit weak deacetylase activity but robust demalonylase and desuccinylase activity, expanding the repertoire of NAD+-dependent deacylases.
• Dysregulation of NAD+-dependent deacetylase activity is implicated in cancer, asthma, metabolic disorders, and immune evasion.
• Studying this activity requires integrating genetic models (knockout, knock-in, point mutation), biochemical assays, and multi-omics approaches.
Description
NAD-dependent protein lysine deacetylase activity (GO:0034979) is a molecular function that catalyzes the removal of acetyl groups from lysine residues on target proteins, strictly requiring nicotinamide adenine dinucleotide (NAD+) as a co-substrate. This reaction couples protein deacetylation to NAD+ hydrolysis, generating nicotinamide and 2''-O-acetyl-ADP-ribose, and thereby links cellular metabolic status to protein post-translational modifications. The sirtuin family of enzymes, conserved from bacteria to humans, constitutes the primary mediators of this activity. Because NAD+ levels fluctuate with cellular energy state, this activity serves as a metabolic sensor that influences transcription, metabolism, stress responses, and aging. Researchers study GO:0034979 to understand how acetylation dynamics control physiological processes and how their perturbation contributes to diseases such as cancer, metabolic disorders, and inflammatory conditions. The discovery that certain sirtuins, like SIRT5, preferentially remove malonyl and succinyl groups rather than acetyl groups highlights the broader deacylase capability within this GO term. Thus, GO:0034979 represents a central node connecting NAD+ metabolism to cellular regulation.
NAD-dependent protein lysine deacetylase activity At A Glance
| GO ID | GO:0034979 |
|---|---|
| GO term | NAD-dependent protein lysine deacetylase activity |
| Ontology | molecular_function |
| Synonym | NAD(+)-dependent protein deacetylase; NAD-dependent protein deacetylase activity; NAD(+)-dependent protein deacylase; protein acetyllysine N-acetyltransferase; protein lysine deacetylase; protein lysine deacylase |
| Major function | Removal of acetyl groups from lysine residues on proteins using NAD+ as a co-substrate |
| Reaction | N(6)-acetyl-L-lysyl-[protein] + NAD+ + H2O = L-lysyl-[protein] + 2''-O-acetyl-ADP-D-ribose + nicotinamide |
| Cofactor | NAD+ (nicotinamide adenine dinucleotide) |
| Enzyme family | Sirtuins (Sir2-related enzymes) |
What Is GO:0034979?
GO:0034979 is defined as the catalysis of the reaction: N(6)-acetyl-L-lysyl-[protein] + NAD+ + H2O = L-lysyl-[protein] + 2''-O-acetyl-ADP-D-ribose + nicotinamide. In other words, it is an enzymatic activity that transfers an acetyl group from a protein lysine residue to NAD+, yielding a deacetylated protein, nicotinamide, and 2''-O-acetyl-ADP-ribose. This activity is strictly dependent on NAD+ and is distinct from classical Zn2+-dependent histone deacetylases.
Why Is NAD-dependent protein lysine deacetylase activity Important in Cell Biology?
NAD-dependent protein lysine deacetylase activity is fundamentally important because it directly couples the cellular energy and redox state, sensed through NAD+ levels, to the regulation of protein function via deacetylation. This activity controls key metabolic enzymes, transcription factors, and chromatin components, thereby influencing mitochondrial function, inflammation, cell survival, and aging. Its dysregulation is linked to a wide range of human diseases, including hepatocellular carcinoma, asthma, and immune disorders. Moreover, the ability of some sirtuins to remove other acyl groups, such as succinyl and malonyl, underscores the broader significance of NAD+-dependent deacylase activity in cellular physiology. Understanding GO:0034979 is therefore essential for developing therapeutics that target sirtuins or modulate NAD+ metabolism.
• Regulates mitochondrial fatty-acid oxidation through reversible deacetylation of enzymes such as AceCS2.
• Controls inflammatory activation in microglia via early glycolytic reprogramming.
• Suppresses hepatocellular carcinoma growth through SIRT3-dependent delactylation of cyclin E2.
• Modulates T-cell antitumor immunity by regulating BCAA and fatty acid metabolism.
• Influences asthma pathogenesis through sirtuin-mediated pathways.
• Serves as a target for therapeutic development, as exemplified by SIRT5 modulators.
• Provides a mechanism for metabolic sensing by linking NAD+ availability to protein acetylation.
• Expands the repertoire of post-translational modifications via demalonylation and desuccinylation by SIRT5.
What Happens During NAD-dependent protein lysine deacetylase activity?
NAD+ Binding and Acetyl-Lysine Recognition
In simple terms: The enzyme first grabs NAD+ and the acetylated protein target.
The catalytic cycle begins with the binding of NAD+ and an acetyl-lysine-containing substrate protein to the sirtuin enzyme. Sirtuins possess a conserved catalytic core that accommodates both NAD+ and the acetyl-lysine side chain, positioning them for the deacetylation reaction. This binding is essential for the subsequent chemistry and is a key point of regulation by cellular NAD+ levels.
Catalysis and Formation of 2''-O-Acetyl-ADP-Ribose
In simple terms: The acetyl group is transferred from the protein to NAD+, breaking the NAD+ molecule and releasing nicotinamide.
Upon binding, the enzyme catalyzes the cleavage of NAD+ into nicotinamide and an ADP-ribose intermediate, while the acetyl group from the lysine residue is transferred to the 2''-OH of the ADP-ribose moiety, forming 2''-O-acetyl-ADP-ribose. The protein lysine is thereby deacetylated. This concerted mechanism is unique to sirtuins and distinguishes them from other deacetylases.
Product Release and Enzyme Turnover
In simple terms: The deacetylated protein, nicotinamide, and the acetylated byproduct are released, allowing the enzyme to work again.
Following catalysis, the deacetylated protein, nicotinamide, and 2''-O-acetyl-ADP-ribose are released from the active site. The enzyme can then undergo multiple rounds of catalysis. The reaction is reversible in principle, but under physiological conditions, the hydrolysis of NAD+ drives the reaction forward.
Deacylation Beyond Acetyl Groups
In simple terms: Some sirtuins can also remove other chemical groups like succinyl or malonyl, not just acetyl.
Certain sirtuins, notably SIRT5, exhibit efficient demalonylase and desuccinylase activities, removing malonyl and succinyl groups from lysine residues in a NAD+-dependent manner. This broadens the definition of NAD-dependent protein lysine deacylase activity and highlights the functional diversity within the sirtuin family.
Key Genes Involved in GO:0034979 NAD-dependent protein lysine deacetylase activity
The following genes encode enzymes that possess NAD-dependent protein lysine deacetylase activity or are directly involved in its regulation and downstream effects.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SIRT1 | NAD-dependent deacetylase targeting histones and transcription factors | Metabolism, aging, inflammation, cancer |
| SIRT2 | Cytoplasmic deacetylase affecting cytoskeleton and cell cycle | Neurodegeneration, cancer, inflammation |
| SIRT3 | Mitochondrial deacetylase regulating fatty-acid oxidation and ROS | Metabolic disorders, hepatocellular carcinoma |
| SIRT4 | Mitochondrial deacetylase and ADP-ribosyltransferase | Metabolism, insulin secretion |
| SIRT5 | NAD-dependent demalonylase and desuccinylase | Metabolic regulation, cancer |
| SIRT6 | Chromatin-associated deacetylase involved in DNA repair | Aging, cancer, genome stability |
| SIRT7 | Nucleolar deacetylase regulating rRNA transcription | T-cell immunity, cancer, metabolism |
| AceCS2 | Mitochondrial acetyl-CoA synthetase regulated by SIRT3 deacetylation | Fatty-acid oxidation, energy metabolism |
| Cyclin E2 | Cell cycle regulator delactylated by SIRT3 | Hepatocellular carcinoma growth |
| NF-κB | Transcription factor modulated by sirtuin deacetylation | Inflammation, immune responses |
| p53 | Tumor suppressor deacetylated by SIRT1 | Cancer, stress responses |
| FOXO | Transcription factors deacetylated by SIRT1 | Metabolism, longevity |
| PGC-1α | Transcriptional coactivator deacetylated by SIRT1 | Mitochondrial biogenesis |
| HIF-1α | Hypoxia-inducible factor regulated by sirtuins | Cancer metabolism |
| BCAA metabolism enzymes | Regulated by SIRT7 in T cells | Antitumor immunity |
How Is NAD-dependent protein lysine deacetylase activity Regulated?
NAD-dependent protein lysine deacetylase activity is regulated primarily by the cellular availability of NAD+, which reflects the metabolic and redox state of the cell. Additionally, sirtuin activity can be modulated by post-translational modifications, protein-protein interactions, and subcellular localization. For example, SIRT3 activity in mitochondria is influenced by NAD+ levels and by reversible acetylation of the enzyme itself. In microglia, early glycolytic reprogramming controls inflammatory activation, partly through NAD+-dependent deacetylase activity. SIRT7 regulates T-cell antitumor immunity by modulating BCAA and fatty acid metabolism, indicating that its deacetylase activity is integrated with metabolic pathways. Pharmacological modulation of SIRT5 activity has been explored, demonstrating that small molecules can regulate this activity.
NAD-dependent protein lysine deacetylase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SIRT3 | Hepatocellular carcinoma | SIRT3 knockout and point-mutation knock-in in liver cancer cell lines |
| SIRT7 | T-cell antitumor immunity | SIRT7 knockout in T cells followed by tumor challenge |
| SIRT5 | Cancer metabolism | SIRT5 overexpression and knockout in cancer cell lines |
| SIRT1 | Inflammation and asthma | SIRT1 knockout in airway epithelial cells |
| SIRT2 | Neurodegeneration | SIRT2 knockout in neuronal cell models |
Cancer
NAD-dependent protein lysine deacetylase activity is frequently dysregulated in cancer. SIRT3-dependent delactylation of cyclin E2 prevents hepatocellular carcinoma growth, indicating a tumor-suppressive role for this activity. SIRT7 regulates T-cell antitumor immunity through metabolic modulation, suggesting that its deacetylase activity influences immune evasion. SIRT5, a deacylase, has been implicated in cancer metabolism and is considered a therapeutic target.
Inflammatory and Immune Disorders
Sirtuin-mediated deacetylation controls inflammatory responses. Early glycolytic reprogramming in microglia controls inflammatory activation via NAD-dependent deacetylase activity. SIRT7 modulates T-cell antitumor immunity by regulating BCAA and fatty acid metabolism. In asthma, sirtuins play roles in airway inflammation and remodeling.
Metabolic Disorders
SIRT3 regulates mitochondrial fatty-acid oxidation by reversible enzyme deacetylation, linking this activity to metabolic homeostasis. Dysregulation of sirtuins has been associated with obesity, insulin resistance, and other metabolic syndromes.
From NAD-dependent protein lysine deacetylase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SIRT3 affect fatty-acid oxidation? | SIRT3 knockout cell line or mouse model |
| Does a specific point mutation in SIRT5 alter demalonylase activity? | Point-mutation knock-in of catalytic residue |
| Does SIRT7 overexpression enhance antitumor immunity? | SIRT7 overexpression in T cells |
| Does SIRT1 deacetylate p53 at a specific lysine? | Knock-in of acetylation-deficient p53 mutant |
| Does SIRT6 recruitment to DNA damage sites require its deacetylase activity? | Tagged knock-in of catalytically dead SIRT6 |
| Can pharmacological activation of SIRT3 mimic caloric restriction? | Overexpression and knockout models treated with small molecules |
How to Study the NAD-dependent protein lysine deacetylase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Deacetylase assay | Enzymatic removal of acetyl groups | Sirtuin activity and inhibitor screening |
| Acetylome profiling | Global lysine acetylation sites | Identifying sirtuin targets |
| CRISPR knockout | Loss of gene function | Determining causal role of sirtuins |
| Point mutation knock-in | Effect of catalytic residue mutation | Dissecting enzyme mechanism |
| Overexpression | Gain of function | Assessing sufficiency in phenotypes |
| Seahorse assay | Mitochondrial respiration and glycolysis | Metabolic reprogramming |
| T-cell functional assay | Proliferation and cytokine release | Antitumor immunity |
Biochemical Deacetylase Assays
In vitro deacetylase assays using recombinant sirtuins and acetylated peptide substrates, with NAD+ as a cofactor, measure the release of nicotinamide or 2''-O-acetyl-ADP-ribose. These assays are fundamental for characterizing enzyme kinetics and testing inhibitors.
Proteomics and Acetylome Analysis
Mass spectrometry-based acetylome profiling allows global identification of lysine acetylation sites and quantification of changes upon modulation of sirtuin activity. This approach has been used to identify SIRT3 targets involved in fatty-acid oxidation.
Genetic Knockout and Knock-in Models
CRISPR-Cas9-mediated knockout, point mutation, and knock-in models enable functional studies of specific sirtuins in cells and organisms. For example, SIRT3 knockout mice have been used to demonstrate its role in mitochondrial metabolism.
Metabolic and Immunological Phenotyping
Seahorse metabolic flux analysis, glucose uptake assays, and immune cell functional assays (e.g., T-cell activation, cytokine production) are used to assess the impact of NAD-dependent deacetylase activity on cellular metabolism and immunity.
How CRISPR Can Be Used to Study GO:0034979 NAD-dependent protein lysine deacetylase activity
Knockout
CRISPR-Cas9 knockout of sirtuin genes (e.g., SIRT3, SIRT7) is used to abolish NAD-dependent deacetylase activity and assess loss-of-function phenotypes, such as altered fatty-acid oxidation or impaired antitumor immunity.
Point Mutation
Introducing point mutations in the catalytic domain of sirtuins (e.g., H248Y in SIRT5) via CRISPR can generate catalytically inactive enzymes, allowing researchers to distinguish deacetylase-dependent from independent functions.
Knock-in
Knock-in of tagged sirtuins (e.g., FLAG-SIRT3) enables affinity purification and localization studies. Knock-in of acetylation-deficient substrate mutants (e.g., p53-K382R) helps map deacetylation sites.
Overexpression
CRISPR activation or cDNA overexpression of sirtuins is used to test gain-of-function effects, such as enhanced deacetylation of targets and protection against metabolic stress.
How EDITGENE Supports NAD-dependent protein lysine deacetylase activity Research
Researchers studying NAD-dependent protein lysine deacetylase activity-related genes often need to determine whether a candidate gene is causally involved in a specific phenotype, such as metabolic reprogramming or tumor suppression. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for NAD-dependent protein lysine deacetylase activity research.
Frequently Asked Questions About NAD-dependent protein lysine deacetylase activity
What is NAD-dependent protein lysine deacetylase activity?
It is an enzymatic activity (GO:0034979) that removes acetyl groups from lysine residues on proteins using NAD+ as a co-substrate, producing nicotinamide and 2''-O-acetyl-ADP-ribose.
What genes are involved in NAD-dependent protein lysine deacetylase activity?
The main genes are sirtuins (SIRT1-7), which encode NAD+-dependent deacetylases and deacylases.
Which diseases are linked to NAD-dependent protein lysine deacetylase activity?
It is implicated in cancer, inflammatory disorders, metabolic diseases, and asthma.
How is NAD-dependent protein lysine deacetylase activity regulated?
It is regulated by cellular NAD+ levels, post-translational modifications, and protein interactions.
What is the difference between sirtuins and classical HDACs?
Sirtuins require NAD+ for deacetylation, whereas classical HDACs use Zn2+ and are NAD+-independent.
Can SIRT5 deacetylate proteins?
SIRT5 has weak deacetylase activity but robust demalonylase and desuccinylase activity.
How can I study NAD-dependent deacetylase activity in the lab?
Use biochemical assays, acetylome profiling, and CRISPR knockout/knock-in models.
What is the role of SIRT3 in metabolism?
SIRT3 deacetylates mitochondrial enzymes to regulate fatty-acid oxidation and ROS homeostasis.
Does SIRT7 affect immunity?
Yes, SIRT7 regulates T-cell antitumor immunity through BCAA and fatty acid metabolism.
What CRISPR models are available for sirtuin research?
Knockout, point mutation, knock-in, and overexpression models can be generated for any sirtuin gene.
Conclusion
NAD-dependent protein lysine deacetylase activity (GO:0034979) is a central enzymatic function that links cellular metabolism to protein regulation through NAD+-dependent deacetylation. The sirtuin family mediates this activity and controls diverse processes ranging from mitochondrial fatty-acid oxidation to immune responses and tumor suppression. Dysregulation of this activity contributes to cancer, inflammatory diseases, and metabolic disorders, making it a promising therapeutic target. Continued research using advanced CRISPR models and multi-omics approaches will further illuminate its mechanistic roles and translational potential.
References
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- 2. Cheng J et al.. 2021. Early glycolytic reprogramming controls microglial inflammatory activation.. J Neuroinflammation 18(1):129 PMID: 34107997
- 3. Jin J et al.. 2023. SIRT3-dependent delactylation of cyclin E2 prevents hepatocellular carcinoma growth.. EMBO Rep 24(5):e56052 PMID: 36896611
- 4. Hirschey MD et al.. 2010. SIRT3 regulates mitochondrial fatty-acid oxidation by reversible enzyme deacetylation.. Nature 464(7285):121-5 PMID: 20203611
- 5. North BJ et al.. 2004. Sirtuins: Sir2-related NAD-dependent protein deacetylases.. Genome Biol 5(5):224 PMID: 15128440
- 6. Hu Z et al.. 2025. SIRT7 regulates T-cell antitumor immunity through modulation BCAA and fatty acid metabolism.. Cell Death Differ 32(10):1777-1790 PMID: 40140560
- 7. Fiorentino F et al.. 2022. Therapeutic Potential and Activity Modulation of the Protein Lysine Deacylase Sirtuin 5.. J Med Chem 65(14):9580-9606 PMID: 35802779
- 8. Liu Y et al.. 2022. Roles of sirtuins in asthma.. Respir Res 23(1):251 PMID: 36117172
