GO:0046970 histone H4K16 deacetylase activity, NAD-dependent: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0046970 describes the NAD+-dependent enzymatic removal of the acetyl group from histone H4 lysine 16 (H4K16), a reaction that consumes NAD+ and releases nicotinamide and 2''-O-acetyl-ADP-ribose.
• This activity is catalyzed by sirtuin-family deacetylases, principally SIRT1 in mammals, and couples chromatin state to cellular metabolic status.
• H4K16 deacetylation promotes chromatin compaction and transcriptional silencing, and is required for heterochromatin-dependent gene repression.
• Loss of H4K16 deacetylation impairs processes such as meiotic cohesion, maternal-zygotic transition, and stem cell maintenance.
• Dysregulation of this activity is linked to aging, cancer, metabolic disease, and impaired tissue regeneration.
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of H4K16 deacetylase function in health and disease.
Description
Histone H4 lysine 16 (H4K16) is a key regulatory residue whose acetylation state controls chromatin architecture and gene expression. The enzyme activity defined by GO:0046970, histone H4K16 deacetylase activity, NAD-dependent, removes the acetyl group from H4K16 in a reaction that requires NAD+ and produces nicotinamide and 2''-O-acetyl-ADP-ribose. This activity is mediated by NAD+-dependent sirtuin deacetylases, with SIRT1 being the principal mammalian enzyme responsible for H4K16 deacetylation in many contexts. Because the reaction consumes NAD+, it directly links the metabolic state of the cell to chromatin regulation and transcriptional output. Researchers study GO:0046970 to understand how metabolic cues are translated into stable epigenetic changes that influence development, tissue homeostasis, and disease. The reaction is central to heterochromatin formation and gene silencing, and its disruption has been implicated in aging, cancer, and stem cell dysfunction. This article summarizes the mechanism, key genes, disease relevance, and experimental approaches for investigating this activity.
histone H4K16 deacetylase activity, NAD-dependent At A Glance
| GO ID | GO:0046970 |
|---|---|
| GO term | histone H4K16 deacetylase activity, NAD-dependent |
| Ontology | molecular_function |
| Synonym | NAD-dependent histone deacetylase activity (H4-K16 specific); NAD-dependent histone H4-K16 deacetylase activity; NAD-dependent histone H4K16 deacetylase activity |
| Major function | Catalyzes NAD+-dependent removal of the acetyl group from histone H4 lysine 16, producing nicotinamide and 2''-O-acetyl-ADP-ribose |
| Reaction | histone H4 N6-acetyl-L-lysine (position 16) + NAD+ + H2O = histone H4 L-lysine (position 16) + 2''-O-acetyl-ADP-ribose + nicotinamide |
| Cofactor | NAD+ |
| Primary enzyme family | Sirtuin (class III histone deacetylase) family; SIRT1 in mammals |
| Biological context | Chromatin silencing, heterochromatin formation, metabolic-epigenetic coupling |
What Is GO:0046970?
GO:0046970 is a molecular function term describing the catalysis of the reaction: histone H4 N6-acetyl-L-lysine at position 16 + NAD+ + H2O = histone H4 L-lysine at position 16 + 2''-O-acetyl-ADP-ribose + nicotinamide. In other words, it is the NAD+-dependent removal of the acetyl group from histone H4 lysine 16, transferring the acetyl group to NAD+ to generate 2''-O-acetyl-ADP-ribose and nicotinamide. This activity is synonymous with NAD-dependent histone deacetylase activity (H4-K16 specific) and is carried out by sirtuin enzymes.
Why Is histone H4K16 deacetylase activity, NAD-dependent Important in Cell Biology?
GO:0046970 is important because it provides a direct biochemical link between cellular metabolism and epigenetic regulation. The reaction consumes NAD+, a central metabolic cofactor, and thereby couples the energy and redox state of the cell to chromatin structure and gene expression. This activity is required for heterochromatin-dependent transcriptional silencing and for maintaining the repressed state of specific genomic loci. It plays essential roles in development, including meiotic cohesion and maternal-zygotic transition, and in adult tissue homeostasis such as skeletal muscle stem cell maintenance. Dysregulation of H4K16 deacetylation has been associated with aging, cancer, and impaired regeneration, making it a target of interest for therapeutic intervention.
• Couples NAD+ metabolism to chromatin state and gene expression.
• Required for heterochromatin-dependent transcriptional gene silencing.
• Supports meiotic cohesion and prevents chromosome missegregation in oocytes.
• Necessary for maternal-zygotic transition during early development.
• Maintains skeletal muscle stem cell function and regenerative capacity.
• Contributes to hematopoietic stem cell radioprotection.
• Mediates sirtuin-1-dependent chromatin silencing and transcriptional repression.
• Impacts expression of extracellular matrix genes such as COL2A1 through SirT1-mediated deacetylation.
• Linked to aging-related decline in oocyte quality and tissue homeostasis.
• Provides a mechanistic basis for metabolic-epigenetic crosstalk in disease.
What Happens During histone H4K16 deacetylase activity, NAD-dependent?
Substrate recognition and binding
In simple terms: The enzyme finds and binds to the acetylated histone H4 tail.
The NAD+-dependent H4K16 deacetylase, primarily SIRT1 in mammals, recognizes the histone H4 N-terminal tail and binds to the acetylated lysine 16 residue. This interaction is part of a larger chromatin context in which the enzyme is recruited to specific genomic loci through association with DNA-binding repressors and chromatin-modifying complexes. The enzyme's catalytic domain accommodates the acetyl-lysine substrate in a pocket that positions it for NAD+-dependent catalysis.
NAD+ consumption and acetyl group transfer
In simple terms: The enzyme uses NAD+ to remove the acetyl group from H4K16.
Once bound, the enzyme catalyzes the cleavage of NAD+ and transfers the acetyl group from H4K16 to the ADP-ribose moiety of NAD+, generating 2''-O-acetyl-ADP-ribose and nicotinamide as products. This reaction is unique among histone deacetylases because it strictly requires NAD+ as a cofactor, distinguishing it from zinc-dependent class I and II HDACs. The consumption of NAD+ directly reflects the cellular metabolic state, making the reaction sensitive to NAD+ availability.
Chromatin compaction and transcriptional silencing
In simple terms: Removing the acetyl mark makes chromatin tighter and turns genes off.
Deacetylation of H4K16 promotes the formation of compact, higher-order chromatin structures that are refractory to transcription. This activity is required for heterochromatin-dependent transcriptional gene silencing, as shown by reconstitution experiments in which H4K16 deacetylation is necessary for silencing at specific loci. Sirtuin-1-mediated H4K16 deacetylation also induces transcriptional repression of target genes such as COL2A1 by creating a repressive chromatin environment. In this way, the reaction contributes to stable gene repression programs.
Metabolic sensing and dynamic regulation
In simple terms: The enzyme acts as a metabolic sensor that adjusts gene expression.
Because the reaction consumes NAD+, its activity is modulated by the cellular NAD+/NADH ratio and by metabolic pathways that influence NAD+ biosynthesis. In skeletal muscle stem cells, SIRT1 translates a metabolic switch into regulatory epigenetics, linking nutrient availability to H4K16 deacetylation and gene expression changes. Similarly, SIRT1 activity is required for maternal-zygotic transition, where metabolic and developmental cues converge. This metabolic sensing function allows the enzyme to coordinate chromatin state with energy status.
Role in chromosome segregation and cohesion
In simple terms: The enzyme helps chromosomes separate correctly during cell division.
H4K16 deacetylation by SIRT1 is required for meiotic cohesion, and preserving SIRT1 activity in aging oocytes reduces chromosome missegregation. This function highlights the importance of the reaction in maintaining genomic stability during meiosis. The activity contributes to proper chromosome architecture and segregation, and its decline with age is associated with increased aneuploidy.
Key Genes Involved in GO:0046970 histone H4K16 deacetylase activity, NAD-dependent
The following genes and proteins are directly or functionally linked to NAD-dependent histone H4K16 deacetylase activity (GO:0046970) based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SIRT1 | Principal NAD+-dependent H4K16 deacetylase in mammals | Central enzyme for GO:0046970; knockout and overexpression models used to study chromatin and metabolism |
| SIRT3 | NAD+-dependent deacetylase with related catalytic mechanism | Provides structural and mechanistic insights into sirtuin catalysis |
| SIRT2 | NAD+-dependent deacetylase family member | Related sirtuin with distinct substrate specificity; comparative studies |
| SIRT6 | NAD+-dependent deacetylase and ADP-ribosyltransferase | Family member with chromatin-associated functions; comparative analysis |
| SIRT7 | NAD+-dependent deacetylase family member | Nuclear sirtuin with roles in chromatin regulation; family comparison |
| KDM2B | Histone H3K79 demethylase that induces repression via SIRT1 | Links SIRT1-mediated chromatin silencing to transcriptional repression |
| SET7/9 | Histone methyltransferase that binds and represses SirT1 | Regulates SirT1 histone deacetylation and COL2A1 expression |
| COL2A1 | Extracellular matrix gene repressed by SirT1-mediated deacetylation | Readout for SIRT1-dependent transcriptional repression |
| NAMPT | NAD+ biosynthetic enzyme | Influences NAD+ availability for sirtuin activity |
| NR | NAD+ precursor | Modulates NAD+ levels and sirtuin activity |
| FOXO | Transcription factor regulated by SIRT1 | Downstream target of SIRT1 in stem cell maintenance |
| p53 | Tumor suppressor deacetylated by SIRT1 | Linked to SIRT1-mediated stress responses |
| PGC-1α | Metabolic regulator deacetylated by SIRT1 | Connects SIRT1 to mitochondrial function |
| H4C1 | Histone H4 gene | Encodes the substrate histone H4 for H4K16 deacetylation |
| H4C2 | Histone H4 gene | Encodes histone H4 substrate; variant context |
| H4C3 | Histone H4 gene | Encodes histone H4 substrate; variant context |
| H4C4 | Histone H4 gene | Encodes histone H4 substrate; variant context |
| H4C5 | Histone H4 gene | Encodes histone H4 substrate; variant context |
How Is histone H4K16 deacetylase activity, NAD-dependent Regulated?
The activity of NAD-dependent H4K16 deacetylase is regulated at multiple levels. Its dependence on NAD+ makes it sensitive to cellular metabolic status, including NAD+ biosynthesis and the NAD+/NADH ratio. SIRT1, the principal enzyme for this activity, is regulated by protein-protein interactions and post-translational modifications; for example, SET7/9 binds and represses SirT1 histone deacetylation, thereby modulating H4K16 acetylation levels. KDM2B induces transcriptional repression via sirtuin-1-mediated chromatin silencing, indicating that chromatin-modifying enzymes can recruit and regulate SIRT1 activity. In skeletal muscle stem cells, a metabolic switch regulates SIRT1 activity and downstream H4K16 deacetylation, linking nutrient availability to epigenetic changes. Additionally, SIRT1 activity is required for maternal-zygotic transition, where developmental cues may influence its function. These regulatory inputs ensure that H4K16 deacetylation is dynamically controlled in response to metabolic and developmental signals.
histone H4K16 deacetylase activity, NAD-dependent and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SIRT1 | Aging-related oocyte aneuploidy; meiotic cohesion defects | Sirt1 knockout or knock-in oocytes; point-mutation models |
| SIRT1 | Hematopoietic stem cell radioprotection and stress response | Sirt1 overexpression in hematopoietic stem cells |
| SIRT1 | Skeletal muscle stem cell dysfunction and impaired regeneration | Sirt1 conditional knockout in muscle stem cells |
| KDM2B | Transcriptional repression via SIRT1-mediated chromatin silencing | KDM2B knockout with SIRT1 rescue |
| SET7/9 | COL2A1 regulation and skeletal biology | SET7/9 knockout or point-mutation chondrocyte models |
Aging and reproductive decline
Decline in SIRT1 activity and H4K16 deacetylation is associated with aging-related meiotic defects. Preserving SIRT1 activity in aging oocytes reduces chromosome missegregation, suggesting that loss of this activity contributes to age-related aneuploidy. This links GO:0046970 to reproductive aging and meiotic cohesion maintenance.
Cancer and metabolic disease
SIRT1, the main enzyme for H4K16 deacetylation, is implicated in cancer and metabolic regulation. Upregulation of SIRT1 contributes to radioprotection of hematopoietic stem cells, indicating a role in stress responses and cell survival. Dysregulated SIRT1 activity can alter chromatin silencing and gene expression programs relevant to tumorigenesis and metabolic disease.
Stem cell dysfunction and tissue regeneration
In skeletal muscle stem cells, SIRT1 translates metabolic cues into epigenetic changes required for stem cell maintenance and regeneration. Loss of this activity impairs regenerative capacity, linking GO:0046970 to tissue homeostasis and repair. Similarly, SIRT1 is required for maternal-zygotic transition, highlighting its importance in early development.
Skeletal and extracellular matrix disorders
SirT1-mediated histone deacetylation regulates COL2A1 expression, and SET7/9 impacts COL2A1 through repression of SirT1. This connects H4K16 deacetylation to cartilage and extracellular matrix biology, with potential relevance to skeletal disorders.
From histone H4K16 deacetylase activity, NAD-dependent-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SIRT1 abolish H4K16 deacetylation? | SIRT1 knockout cell lines and primary cells |
| How does a catalytic point mutation affect deacetylase activity? | SIRT1 catalytic-dead point-mutation knock-in |
| Can wild-type SIRT1 rescue a disease phenotype? | SIRT1 knock-in or overexpression rescue models |
| Where is SIRT1 recruited in the genome? | Tagged knock-in of SIRT1 for ChIP-seq |
| Does increased SIRT1 activity protect against aging-related defects? | SIRT1 overexpression in oocytes or stem cells |
| What are the downstream targets of H4K16 deacetylation? | SIRT1 knockout combined with RNA-seq and proteomics |
How to Study the histone H4K16 deacetylase activity, NAD-dependent Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ChIP-seq | Genomic localization of H4K16 acetylation and SIRT1 binding | Mapping chromatin targets of H4K16 deacetylation |
| Mass spectrometry | Quantification of histone modifications | Validating H4K16 deacetylation activity and mutant effects |
| NAD+ assay | Cellular NAD+ levels and NAD+/NADH ratio | Assessing metabolic regulation of sirtuin activity |
| Live-cell imaging | Chromosome segregation and cohesion dynamics | Studying meiotic defects in SIRT1-deficient oocytes |
| RNA-seq | Transcriptional changes upon SIRT1 manipulation | Identifying genes repressed by H4K16 deacetylation |
| Western blot | Protein levels and acetylation status | Confirming knockout or overexpression efficiency |
| Immunofluorescence | Nuclear localization and chromatin structure | Visualizing heterochromatin formation |
| Co-immunoprecipitation | Protein-protein interactions | Identifying SIRT1-associated complexes |
Chromatin immunoprecipitation and sequencing (ChIP-seq)
ChIP-seq using antibodies against H4K16 acetylation or tagged SIRT1 can map the genomic loci where H4K16 deacetylation occurs. This approach has been used to study heterochromatin-dependent silencing and SIRT1 recruitment to target genes. It provides genome-wide maps of the reaction's output.
Histone modification analysis by mass spectrometry
Mass spectrometry-based proteomics can quantify H4K16 acetylation levels and identify changes in response to SIRT1 manipulation. This method is useful for validating the catalytic activity of wild-type versus mutant enzymes. It allows precise measurement of the reaction products and substrate modifications.
NAD+ measurement and metabolic assays
Because the reaction consumes NAD+, measuring cellular NAD+ levels and the NAD+/NADH ratio is essential for understanding regulation. Metabolic assays and NAD+ biosynthetic pathway manipulation have been used to link metabolism to H4K16 deacetylation. These methods help determine how metabolic state influences the activity.
Functional assays for chromosome segregation and development
Live-cell imaging and meiotic spread assays can assess chromosome segregation defects upon loss of SIRT1 activity. Such approaches have demonstrated the requirement for SIRT1 in meiotic cohesion and maternal-zygotic transition. These functional readouts connect the molecular activity to cellular phenotypes.
How CRISPR Can Be Used to Study GO:0046970 histone H4K16 deacetylase activity, NAD-dependent
Knockout
CRISPR knockout of SIRT1 or other sirtuin genes eliminates the enzyme responsible for GO:0046970, allowing researchers to test whether H4K16 deacetylation is required for specific processes such as heterochromatin silencing, stem cell maintenance, and meiotic cohesion. Knockout models have been used to demonstrate the necessity of SIRT1 for maternal-zygotic transition and skeletal muscle stem cell function.
Point Mutation
CRISPR point mutation can introduce catalytic-dead mutations in the SIRT1 deacetylase domain to separate its deacetylase activity from other functions. Such models help determine whether the enzymatic activity defined by GO:0046970 is responsible for observed phenotypes. Point mutations can also mimic disease-associated variants.
Knock-in
CRISPR knock-in can be used to tag endogenous SIRT1 with epitopes for ChIP-seq or to introduce reporter alleles. Tagged knock-in enables genome-wide mapping of SIRT1 binding and H4K16 deacetylation sites. Knock-in of wild-type SIRT1 can also rescue phenotypes in knockout backgrounds.
Overexpression
CRISPR-mediated overexpression or transgenic delivery of SIRT1 can increase H4K16 deacetylation activity. Overexpression models have been used to show that preserving SIRT1 activity in aging oocytes reduces missegregation and that SIRT1 upregulation contributes to radioprotection of hematopoietic stem cells. These models are useful for gain-of-function studies.
How EDITGENE Supports histone H4K16 deacetylase activity, NAD-dependent Research
Researchers studying histone H4K16 deacetylase activity, NAD-dependent-related genes often need to determine whether a candidate gene is causally involved in a specific chromatin or disease phenotype. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models that enable such causal experiments.
Contact EDITGENE today to design your custom CRISPR model for histone H4K16 deacetylase activity, NAD-dependent research.
Frequently Asked Questions About histone H4K16 deacetylase activity, NAD-dependent
What is histone H4K16 deacetylase activity, NAD-dependent?
It is the NAD+-dependent enzymatic removal of the acetyl group from histone H4 lysine 16, producing nicotinamide and 2''-O-acetyl-ADP-ribose, as defined by GO:0046970.
What genes are involved in histone H4K16 deacetylase activity, NAD-dependent?
The principal gene is SIRT1, which encodes the main mammalian NAD+-dependent H4K16 deacetylase; other sirtuins such as SIRT2, SIRT3, SIRT6, and SIRT7 are related family members.
Which enzyme catalyzes H4K16 deacetylation?
SIRT1 is the primary enzyme responsible for NAD+-dependent H4K16 deacetylation in mammals.
Why is NAD+ required for H4K16 deacetylation?
NAD+ is consumed as a cofactor in the reaction, and the acetyl group is transferred to NAD+ to form 2''-O-acetyl-ADP-ribose, linking the reaction to cellular metabolism.
What is the role of H4K16 deacetylation in gene silencing?
It promotes chromatin compaction and is required for heterochromatin-dependent transcriptional gene silencing.
How is H4K16 deacetylation linked to aging?
Loss of SIRT1 activity and H4K16 deacetylation is associated with aging-related meiotic cohesion defects, and preserving SIRT1 activity reduces chromosome missegregation in aging oocytes.
What diseases are associated with H4K16 deacetylase dysfunction?
Dysregulation has been linked to aging-related reproductive decline, cancer, metabolic disease, and impaired stem cell regeneration.
How can I study H4K16 deacetylation using CRISPR?
CRISPR knockout, point mutation, knock-in, and overexpression of SIRT1 can be used to test the causal role of the activity in specific phenotypes.
What methods measure H4K16 deacetylation?
ChIP-seq, mass spectrometry, NAD+ assays, and functional imaging are commonly used to measure H4K16 acetylation levels and the consequences of its removal.
Does SIRT1 regulate COL2A1 expression?
Yes, SirT1-mediated histone deacetylation represses COL2A1, and SET7/9 impacts COL2A1 expression through binding and repression of SirT1.
Conclusion
GO:0046970, histone H4K16 deacetylase activity, NAD-dependent, represents a critical molecular link between cellular metabolism and epigenetic regulation. The reaction, catalyzed primarily by SIRT1, removes the acetyl group from H4K16 in an NAD+-consuming manner, promoting chromatin compaction and transcriptional silencing. Its roles in meiotic cohesion, maternal-zygotic transition, stem cell maintenance, and stress responses underscore its broad biological importance. Dysregulation of this activity is associated with aging, cancer, and regenerative decline, making it a compelling target for further research. CRISPR-based models from EDITGENE can accelerate the functional dissection of this activity in health and disease.
References
- 1. Meng Z et al.. 2025. Meiotic cohesion requires Sirt1 and preserving its activity in aging oocytes reduces missegregation.. EMBO Rep 26(24):6121-6140 PMID: 41214367
- 2. Ryall JG et al.. 2015. The NAD(+)-dependent SIRT1 deacetylase translates a metabolic switch into regulatory epigenetics in skeletal muscle stem cells.. Cell Stem Cell 16(2):171-83 PMID: 25600643
- 3. Nevoral J et al.. 2024. Dynamics and necessity of SIRT1 for maternal-zygotic transition.. Sci Rep 14(1):21598 PMID: 39285243
- 4. Johnson A et al.. 2009. Reconstitution of heterochromatin-dependent transcriptional gene silencing.. Mol Cell 35(6):769-81 PMID: 19782027
- 5. Zhang X et al.. 2019. Molecular basis for hierarchical histone de-β-hydroxybutyrylation by SIRT3.. Cell Discov 5:35 PMID: 31636949
- 6. Liu L et al.. 2022. Upregulation of SIRT1 Contributes to dmPGE2-dependent Radioprotection of Hematopoietic Stem Cells.. Stem Cell Rev Rep 18(4):1478-1494 PMID: 35318613
- 7. Kang JY et al.. 2018. KDM2B is a histone H3K79 demethylase and induces transcriptional repression via sirtuin-1-mediated chromatin silencing.. FASEB J 32(10):5737-5750 PMID: 29763382
- 8. Oppenheimer H et al.. 2014. Set7/9 impacts COL2A1 expression through binding and repression of SirT1 histone deacetylation.. J Bone Miner Res 29(2):348-60 PMID: 23873758
