GO:0141218 NAD-dependent protein lysine deacylase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0141218 describes an enzymatic activity that removes acyl groups from lysine residues on proteins using NAD+ as a co-substrate, releasing nicotinamide and 2''-O-acyl-ADP-ribose.
• The reaction is catalyzed by sirtuin-family enzymes, including SIRT1, SIRT2, SIRT5, and SIRT6, which differ in substrate specificity and biological roles.
• This activity is central to epigenetic regulation, metabolic control, and stress responses, and its dysregulation is linked to cancer, asthma, and metabolic disorders.
• Chemical probes and continuous assays have been developed to monitor NAD+-dependent deacylase activity, enabling drug discovery and mechanistic studies.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) are essential to dissect the causal roles of deacylase enzymes in disease.
• Target engagement and isoform selectivity remain key challenges, as highlighted by recent structural and pharmacological studies.
Description
NAD-dependent protein lysine deacylase activity (GO:0141218) is a molecular function that removes acyl modifications from lysine residues on target proteins, utilizing nicotinamide adenine dinucleotide (NAD+) as a co-substrate. This activity is catalyzed by sirtuins, a conserved family of enzymes that couple deacylation to NAD+ hydrolysis, producing nicotinamide and 2''-O-acyl-ADP-ribose. The reaction is reversible and highly regulated, influencing diverse cellular processes such as chromatin remodeling, metabolism, and stress responses. Researchers study this activity to understand its roles in aging, cancer, and inflammatory diseases, and to develop small-molecule modulators. The enzymatic mechanism involves a conserved catalytic core that binds NAD+ and the acyl-lysine substrate, facilitating cleavage and transfer of the acyl group. Because sirtuins exhibit distinct substrate preferences and tissue distributions, precise experimental models are required to attribute specific functions to individual enzymes. This article synthesizes current knowledge on GO:0141218, covering its definition, mechanism, key genes, disease relevance, and research methodologies, with a focus on CRISPR-based approaches for functional validation.
NAD-dependent protein lysine deacylase activity At A Glance
| GO ID | GO:0141218 |
|---|---|
| GO term | NAD-dependent protein lysine deacylase activity |
| Ontology | molecular_function |
| Synonym | protein lysine deacylase activity |
| Definition | Catalysis of the reaction: N6-acyl-L-lysyl-[protein] + NAD+ + H2O = 2''-O-acyl-ADP-D-ribose + nicotinamide + L-lysyl-[protein]. |
| Major function | Removal of acyl groups from lysine residues on proteins, regulating their activity, localization, and interactions. |
| Cofactor | NAD+ (nicotinamide adenine dinucleotide) |
| Representative enzymes | Sirtuins (SIRT1-7) |
| Subcellular location | Nucleus, cytoplasm, mitochondria (varies by sirtuin) |
What Is GO:0141218?
GO:0141218, NAD-dependent protein lysine deacylase activity, is defined as the catalysis of the reaction: N6-acyl-L-lysyl-[protein] + NAD+ + H2O = 2''-O-acyl-ADP-D-ribose + nicotinamide + L-lysyl-[protein]. In other words, it is an enzymatic activity that removes an acyl group (such as acetyl, succinyl, or malonyl) from a lysine residue on a protein, using NAD+ as a cofactor and generating nicotinamide and an acyl-ADP-ribose intermediate. This activity is synonymous with protein lysine deacylase activity and is a hallmark of sirtuin enzymes.
Why Is NAD-dependent protein lysine deacylase activity Important in Cell Biology?
NAD-dependent protein lysine deacylase activity is critical for cellular homeostasis because it links the metabolic state of the cell, reflected by NAD+ levels, to protein function through post-translational modification. This activity regulates key processes such as gene expression, DNA repair, apoptosis, and metabolic flux, and its dysregulation is implicated in cancer, neurodegeneration, asthma, and metabolic diseases. Understanding this activity at the molecular level enables the development of targeted therapeutics, including sirtuin inhibitors and activators.
• Regulates epigenetic marks and chromatin structure through histone deacetylation.
• Controls metabolic enzymes via deacylation, influencing glycolysis, fatty acid oxidation, and oxidative phosphorylation.
• Modulates stress responses, including oxidative stress and DNA damage repair.
• Implicated in cancer progression, with sirtuins acting as tumor suppressors or oncogenes in a context-dependent manner.
• Plays a role in inflammatory airway diseases such as asthma.
• Target for drug discovery, with small-molecule inhibitors and activators under development.
• Involved in aging and longevity pathways, particularly through SIRT1 and SIRT6.
• Requires NAD+ as a co-substrate, directly coupling enzymatic activity to cellular energy status.
• Subject to isoform-specific regulation and post-translational modifications.
• Essential for mitochondrial function via SIRT3, SIRT4, and SIRT5.
Molecular Mechanism of NAD-dependent protein lysine deacylase activity
Substrate Recognition and Binding
In simple terms: The enzyme first grabs the target protein and the NAD+ molecule.
Sirtuins recognize specific acyl-lysine motifs on target proteins through a conserved catalytic domain that forms a hydrophobic tunnel for the acyl chain. The substrate binding pocket accommodates different acyl groups, determining whether the enzyme acts as a deacetylase, desuccinylase, or demalonylase. Structural studies of SIRT6 have revealed plasticity in the acyl-binding pocket that allows recognition of long-chain fatty acyl groups.
NAD+ Cleavage and Acyl-ADP-Ribose Formation
In simple terms: NAD+ is split, and the acyl group is transferred to part of it.
Upon binding of NAD+ and the acyl-lysine substrate, the enzyme catalyzes the cleavage of NAD+ into nicotinamide and ADP-ribose, with the acyl group transferred to the 2''-O position of ADP-ribose, forming 2''-O-acyl-ADP-ribose. This intermediate is released, and the lysine residue is left unmodified. The reaction is stoichiometric with NAD+ consumption, linking deacylase activity to cellular NAD+ levels.
Cofactor Dependence and Regulation by NAD+
In simple terms: The enzyme needs NAD+ to work, so its activity depends on how much NAD+ is available.
NAD+ is an essential cofactor; without it, no deacylation occurs. Cellular NAD+ levels fluctuate with metabolic state, circadian rhythm, and stress, thereby regulating sirtuin activity. This dependence positions sirtuins as metabolic sensors that translate NAD+ availability into protein modification.
Isoform-Specific Catalytic Mechanisms
In simple terms: Different sirtuins have slightly different ways of doing the same job.
SIRT1, SIRT2, SIRT3, SIRT5, and SIRT6 exhibit distinct catalytic efficiencies and substrate preferences. For example, SIRT5 prefers succinylated and malonylated lysines, while SIRT1 and SIRT2 are primarily deacetylases. SIRT6 can remove long-chain fatty acyl groups, a unique activity among sirtuins. These differences arise from variations in the catalytic pocket and flanking regions.
Inhibition and Chemical Probes
In simple terms: Scientists have made molecules that can block or track these enzymes.
Small-molecule inhibitors and activity-based probes have been developed to study sirtuin activity. For instance, 1,2,4-oxadiazole derivatives inhibit SIRT2 with high selectivity, and activity-based probes for SIRT1 enable monitoring of target engagement in cells. These tools are valuable for dissecting the roles of individual sirtuins in health and disease.
Key Genes Involved in GO:0141218 NAD-dependent protein lysine deacylase activity
The following genes encode enzymes that possess NAD-dependent protein lysine deacylase activity or are directly involved in its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SIRT1 | NAD-dependent deacetylase; regulates chromatin, metabolism, and stress responses | Implicated in cancer, aging, and metabolic diseases; target for activators and inhibitors |
| SIRT2 | NAD-dependent deacetylase; controls cell cycle, cytoskeleton, and myelination | Linked to cancer and neurodegeneration; selective inhibitors developed |
| SIRT3 | Mitochondrial deacetylase; regulates energy metabolism and ROS detoxification | Associated with metabolic syndrome and cancer; knockout models available |
| SIRT4 | Mitochondrial deacetylase and ADP-ribosyltransferase; regulates insulin secretion | Role in diabetes and cancer metabolism |
| SIRT5 | NAD-dependent desuccinylase, demalonylase, and deglutarylase | Involved in metabolic reprogramming and cancer; unique substrate specificity |
| SIRT6 | NAD-dependent deacylase; removes long-chain fatty acyl groups; regulates DNA repair and glucose homeostasis | Linked to aging, cancer, and metabolic disorders; structural plasticity studied |
| SIRT7 | Nuclear deacetylase; regulates rRNA transcription and genome stability | Implicated in cancer and cardiovascular disease |
| NAMPT | Rate-limiting enzyme in NAD+ salvage pathway | Regulates sirtuin activity by controlling NAD+ levels |
| NMNAT1 | NAD+ synthase; maintains nuclear NAD+ pools | Mutations cause retinal degeneration; affects sirtuin function |
| CD38 | NAD+ glycohydrolase; degrades NAD+ | Modulates sirtuin activity; target in inflammation and aging |
| PARP1 | NAD+-consuming enzyme; competes with sirtuins for NAD+ | Influences sirtuin activity in DNA damage responses |
| FOXO3 | Transcription factor deacetylated by SIRT1 | Mediates stress resistance and longevity |
| p53 | Tumor suppressor deacetylated by SIRT1 | Regulates apoptosis and cell cycle; cancer relevance |
| NF-κB | Transcription factor deacetylated by SIRT1 | Controls inflammation; linked to asthma |
| PGC-1α | Transcriptional coactivator deacetylated by SIRT1 and SIRT3 | Regulates mitochondrial biogenesis and metabolism |
| Tubulin | Cytoskeletal protein deacetylated by SIRT2 | Affects microtubule stability and cell motility |
| H3K9 | Histone mark deacetylated by SIRT1 and SIRT6 | Epigenetic regulation of gene expression |
| H4K16 | Histone mark deacetylated by SIRT1 and SIRT2 | Chromatin compaction and transcriptional silencing |
How Is NAD-dependent protein lysine deacylase activity Regulated?
NAD-dependent protein lysine deacylase activity is regulated at multiple levels. The availability of the cofactor NAD+ is a primary determinant, with enzymes such as NAMPT, NMNAT1, CD38, and PARP1 controlling cellular NAD+ levels. Post-translational modifications of sirtuins, including phosphorylation and sumoylation, modulate their catalytic activity and localization. Protein-protein interactions and recruitment to specific chromatin regions or metabolic complexes also influence substrate accessibility. Additionally, small-molecule modulators and endogenous inhibitors can fine-tune activity.
NAD-dependent protein lysine deacylase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SIRT1 | Cancer, metabolic disorders, neurodegeneration | Knockout and overexpression cell lines; point mutants for catalytic activity |
| SIRT2 | Cancer, neurodegeneration | Selective inhibitors in cell culture; knockout models |
| SIRT6 | Aging, cancer, metabolic syndrome | Knockout and knock-in of catalytic mutants; structural studies |
| SIRT5 | Cancer metabolism | Knockout and overexpression; desuccinylase assays |
| NF-κB | Asthma, inflammation | Reporter assays and knockout models |
Cancer
Sirtuins exhibit context-dependent roles in cancer. SIRT1 can deacetylate p53 and FOXO3, promoting cell survival under stress, and is overexpressed in some cancers. SIRT2 acts as a tumor suppressor in certain contexts, and its inhibition is being explored for cancer therapy. SIRT6 deficiency leads to genomic instability and metabolic reprogramming that can favor tumorigenesis. Targeting NAD-dependent deacylases is a promising anticancer strategy.
Asthma and Inflammatory Diseases
Sirtuins regulate inflammatory pathways, including NF-κB signaling, and have been implicated in asthma pathogenesis. Reduced SIRT1 activity is associated with increased airway inflammation, and modulation of sirtuin activity may offer therapeutic benefits.
Metabolic Disorders
SIRT3, SIRT4, and SIRT5 regulate mitochondrial metabolism, and their dysregulation contributes to obesity, insulin resistance, and type 2 diabetes. SIRT1 controls hepatic gluconeogenesis and lipid metabolism, making it a target for metabolic disease interventions.
Neurodegeneration
SIRT2 inhibition has been shown to protect against neurodegeneration in models of Parkinson's and Huntington's diseases, possibly through modulation of tubulin acetylation and axonal transport. SIRT1 activation is neuroprotective in several models.
From NAD-dependent protein lysine deacylase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SIRT1 deacetylase activity affect p53 stability? | SIRT1 knockout or catalytically dead point mutant (H363Y) |
| How does SIRT2 inhibition impact tubulin acetylation? | SIRT2 knockout or selective inhibitor treatment |
| What is the role of SIRT6 in DNA repair? | SIRT6 knockout and knock-in of deacylase-dead mutant |
| Does SIRT5 desuccinylase activity regulate mitochondrial metabolism? | SIRT5 knockout and overexpression |
| Can SIRT1 activation extend lifespan? | Overexpression of SIRT1 in transgenic models |
| How does NAD+ availability affect sirtuin activity? | NAMPT knockout or CD38 overexpression |
How to Study the NAD-dependent protein lysine deacylase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Continuous deacylase assay | Enzymatic activity in real time | High-throughput screening of inhibitors |
| Activity-based probes | Active enzyme levels in cells | Target engagement and selectivity profiling |
| X-ray crystallography | Three-dimensional structure | Structure-guided drug design |
| CRISPR knockout screens | Gene essentiality and pathway interactions | Identifying modifiers of sirtuin function |
| Western blot with acyl-lysine antibodies | Levels of specific acyl modifications | Validating substrate deacylation in cells |
| NAD+ quantification | Cellular NAD+ levels | Correlating cofactor availability with activity |
| RNA-seq | Transcriptional changes | Assessing downstream effects of sirtuin modulation |
| Proteomics | Global acylome changes | Identifying novel substrates |
Continuous Deacylase Activity Assays
Continuous assays measure the release of nicotinamide or the formation of 2''-O-acyl-ADP-ribose using fluorogenic or colorimetric substrates. These assays are suitable for high-throughput screening of inhibitors and for kinetic characterization of sirtuins.
Activity-Based Probes
Activity-based probes covalently label active sirtuins, enabling detection of target engagement in cells and tissues. Probes for SIRT1 and SIRT2 have been developed and used to assess inhibitor selectivity.
Structural Biology
X-ray crystallography and cryo-EM reveal the architecture of the catalytic pocket and substrate binding, informing the design of isoform-selective modulators. Structural studies of SIRT6 have elucidated the basis for its unique deacylase activity.
CRISPR Screens and Functional Genomics
Genome-wide CRISPR knockout screens can identify genes that modulate sensitivity to sirtuin inhibitors or regulate NAD+ metabolism. These screens link deacylase activity to specific cellular pathways and disease phenotypes.
How CRISPR Can Be Used to Study GO:0141218 NAD-dependent protein lysine deacylase activity
Knockout
CRISPR knockout of sirtuin genes (e.g., SIRT1, SIRT2, SIRT6) creates cell models to study loss of deacylase activity. These models help determine whether a phenotype is dependent on the catalytic function or on scaffolding roles of the protein.
Point Mutation
Catalytically dead point mutants (e.g., SIRT1 H363Y, SIRT6 H133Y) can be introduced via CRISPR to separate enzymatic activity from other functions. Such models are crucial for attributing effects specifically to NAD-dependent deacylase activity.
Knock-in
Knock-in of tagged or fluorescently labeled sirtuins allows for live-cell imaging and proteomic analysis of interacting partners. This approach can also be used to introduce disease-associated mutations.
Overexpression
CRISPR activation (CRISPRa) or cDNA overexpression enables gain-of-function studies to assess the consequences of elevated deacylase activity. Overexpression models are useful for testing sufficiency in disease phenotypes.
How EDITGENE Supports NAD-dependent protein lysine deacylase activity Research
Researchers studying NAD-dependent protein lysine deacylase activity-related genes often need to determine whether a candidate gene is causally involved in a specific cellular process or disease. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models, enabling functional validation of sirtuins and their regulators.
Contact EDITGENE today to design your custom CRISPR model for NAD-dependent protein lysine deacylase activity research.
Frequently Asked Questions About NAD-dependent protein lysine deacylase activity
What is NAD-dependent protein lysine deacylase activity?
It is an enzymatic activity that removes acyl groups from lysine residues on proteins using NAD+ as a co-substrate, producing nicotinamide and 2''-O-acyl-ADP-ribose.
What genes are involved in NAD-dependent protein lysine deacylase activity?
The main genes are SIRT1-7, which encode sirtuin enzymes, as well as NAD+ metabolism genes like NAMPT, NMNAT1, and CD38.
What is the GO ID for NAD-dependent protein lysine deacylase activity?
The GO ID is GO:0141218.
Which diseases are linked to NAD-dependent protein lysine deacylase activity?
It is linked to cancer, asthma, metabolic disorders, and neurodegeneration.
How can I measure NAD-dependent protein lysine deacylase activity?
Continuous assays, activity-based probes, and western blotting with acyl-lysine antibodies are commonly used.
What are sirtuins?
Sirtuins are a family of NAD+-dependent deacylases that regulate diverse cellular processes.
Can CRISPR be used to study NAD-dependent protein lysine deacylase activity?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools for functional studies.
What is the role of SIRT6 in deacylation?
SIRT6 removes long-chain fatty acyl groups from proteins and regulates DNA repair and metabolism.
Are there inhibitors of NAD-dependent protein lysine deacylases?
Yes, small-molecule inhibitors such as 1,2,4-oxadiazoles for SIRT2 have been developed.
How does NAD+ availability affect deacylase activity?
NAD+ is an essential cofactor; its cellular levels directly determine sirtuin activity.
Conclusion
NAD-dependent protein lysine deacylase activity (GO:0141218) is a fundamental enzymatic function that couples cellular metabolism to protein regulation. Its dysregulation contributes to cancer, inflammatory diseases, and metabolic disorders, making it a prime target for therapeutic intervention. Advances in chemical probes, structural biology, and CRISPR-based models continue to unravel the complexities of sirtuin biology. EDITGENE provides the tools and services needed to accelerate research in this field.
References
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