GO:0004145 diamine N-acetyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0004145 diamine N-acetyltransferase activity catalyzes the acetyl-CoA-dependent N-acetylation of alkane-alpha,omega-diamines such as putrescine, spermidine, and spermine.
• The reaction produces an N-acetylalkane-alpha,omega-diamine plus CoA and H+, and is a rate-limiting step in polyamine catabolism.
• SAT1 (spermidine/spermine N1-acetyltransferase 1) is the best-characterized enzyme carrying this activity in humans.
• Diamine N-acetyltransferase activity links polyamine metabolism to p53-mediated ferroptosis and tumor suppression.
• N1-acetylspermidine efflux from hepatoma cells can foster macrophage-mediated immune suppression and dampen immunotherapy efficacy.
• Altered diamine N-acetyltransferase activity contributes to acute kidney injury, obesity-related metabolic dysfunction, and cancer progression.
Description
Diamine N-acetyltransferase activity (GO:0004145) is a molecular function defined by the acetyl-CoA-dependent N-acetylation of alkane-alpha,omega-diamines, yielding an N-acetylalkane-alpha,omega-diamine, CoA, and a proton. This activity sits at the intersection of polyamine biosynthesis and catabolism, controlling the intracellular balance of putrescine, spermidine, and spermine, which are essential for cell growth, differentiation, and stress responses. In humans, the enzyme most commonly associated with this activity is spermidine/spermine N1-acetyltransferase 1 (SAT1), which acetylates spermidine and spermine to initiate their catabolism. Because polyamines influence chromatin structure, translation, and oxidative stress, the regulation of GO:0004145 has broad consequences for normal physiology and disease. Recent work has shown that diamine N-acetyltransferase activity is directly engaged by p53 during ferroptotic responses, establishing a mechanistic link between polyamine catabolism and tumor suppression. Moreover, N1-acetylspermidine, the product of this activity, can be exported from tumor cells and modulate the immune microenvironment, affecting the efficacy of cancer immunotherapy. Researchers studying cancer metabolism, kidney injury, and metabolic disease therefore require robust experimental models to interrogate this activity and its downstream effects.
diamine N-acetyltransferase activity At A Glance
| GO ID | GO:0004145 |
|---|---|
| GO term | diamine N-acetyltransferase activity |
| Ontology | molecular_function |
| Synonym | putrescine acetyltransferase activity; spermidine N1-acetyltransferase activity; spermine N-acetyltransferase activity; diamine acetyltransferase activity |
| Major function | Acetyl-CoA-dependent N-acetylation of alkane-alpha,omega-diamines, initiating polyamine catabolism |
| Representative enzyme | SAT1 (spermidine/spermine N1-acetyltransferase 1) in humans |
| Key substrates | Putrescine, spermidine, spermine |
| Key products | N-acetylputrescine, N1-acetylspermidine, N1-acetylspermine, CoA, H+ |
| Pathway context | Polyamine catabolism and homeostasis |
What Is GO:0004145?
GO:0004145 diamine N-acetyltransferase activity is defined by the QuickGO ontology as the catalysis of the reaction: an alkane-alpha,omega-diamine + acetyl-CoA = an N-acetylalkane-alpha,omega-diamine + CoA + H+. In practical terms, this activity transfers an acetyl group from acetyl-CoA to one of the terminal amino groups of a diamine substrate such as putrescine, spermidine, or spermine. The reaction is a central step in polyamine catabolism and is often referred to by synonyms including putrescine acetyltransferase activity, spermidine N1-acetyltransferase activity, and spermine N-acetyltransferase activity.
Why Is diamine N-acetyltransferase activity Important in Cell Biology?
Diamine N-acetyltransferase activity is important because it controls the first committed step of polyamine catabolism, thereby determining the cellular levels of spermidine and spermine, which are critical for cell proliferation, differentiation, and survival. Dysregulation of this activity has been implicated in cancer, acute kidney injury, and metabolic disorders, and it is mechanistically linked to p53-mediated ferroptosis and immune modulation in the tumor microenvironment. Understanding GO:0004145 is therefore essential for researchers studying polyamine biology, oxidative stress, and therapeutic resistance.
• Controls polyamine catabolism and intracellular spermidine/spermine levels.
• Directly engaged by p53 during ferroptotic responses, linking polyamine metabolism to tumor suppression.
• Product N1-acetylspermidine can be exported and foster macrophage-mediated immune suppression, dampening immunotherapy efficacy.
• Altered activity contributes to acute kidney injury through polyamine catabolism.
• SAT1-mediated activity influences triple-negative breast cancer progression under autophagy deficiency.
• Nicotinamide N-methyltransferase knockdown protects against diet-induced obesity, implicating related metabolic pathways.
• Provides a metabolic checkpoint that can be targeted for cancer therapy.
• Serves as a biomarker and mechanistic node in polyamine-related diseases.
What Happens During diamine N-acetyltransferase activity?
Substrate recognition and acetyl-CoA binding
In simple terms: The enzyme grabs a polyamine and an acetyl group donor at the same time.
Diamine N-acetyltransferase activity begins with the binding of an alkane-alpha,omega-diamine substrate, such as putrescine, spermidine, or spermine, and the cofactor acetyl-CoA. The enzyme SAT1 preferentially acetylates spermidine and spermine at the N1 position, but related activities can also act on putrescine. This step is rate-limiting for polyamine catabolism and is highly regulated in response to cellular polyamine levels.
Acetyl transfer and product formation
In simple terms: The acetyl group is moved from acetyl-CoA onto the polyamine.
The catalytic transfer of the acetyl group from acetyl-CoA to the terminal amino group of the diamine yields an N-acetylalkane-alpha,omega-diamine, CoA, and a proton. For example, acetylation of spermidine produces N1-acetylspermidine, which can be further oxidized by polyamine oxidase or exported from the cell. This reaction is the defining chemical step of GO:0004145 and is conserved across eukaryotes and prokaryotes.
Polyamine catabolism and homeostasis
In simple terms: The acetylated polyamine is either recycled or broken down.
Once formed, N-acetylated polyamines enter catabolic pathways that convert them back to putrescine or degrade them further, thereby maintaining polyamine homeostasis. This activity therefore controls the pool of spermidine and spermine available for translation, chromatin regulation, and stress responses. In cancer cells, increased diamine N-acetyltransferase activity can deplete spermidine and spermine, triggering compensatory changes in polyamine metabolism.
Link to ferroptosis and p53 signaling
In simple terms: This activity can help trigger a form of cell death called ferroptosis.
Activation of SAT1, which carries diamine N-acetyltransferase activity, engages polyamine metabolism with p53-mediated ferroptotic responses. p53 induces SAT1 expression, leading to increased polyamine catabolism and lipid peroxidation, which promotes ferroptosis. This mechanism links GO:0004145 directly to tumor suppression and sensitivity to ferroptosis-inducing therapies.
Immune modulation by acetylated polyamine export
In simple terms: Acetylated polyamines can leave the cell and affect immune cells.
N1-acetylspermidine produced by diamine N-acetyltransferase activity can be exported from hepatoma cells and foster macrophage-mediated immune suppression, dampening immunotherapeutic efficacy. This highlights a non-cell-autonomous role for GO:0004145 in shaping the tumor microenvironment.
Key Genes Involved in GO:0004145 diamine N-acetyltransferase activity
The following genes and proteins are experimentally linked to diamine N-acetyltransferase activity or its downstream polyamine catabolism.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SAT1 | Primary human enzyme with spermidine/spermine N1-acetyltransferase activity | Central to polyamine catabolism, ferroptosis, and cancer |
| SMOX | Spermine oxidase, oxidizes spermine to spermidine | Works with SAT1 in polyamine catabolism |
| PAOX | Polyamine oxidase, oxidizes N1-acetylspermine | Downstream of diamine N-acetyltransferase activity |
| ODC1 | Ornithine decarboxylase, rate-limiting for polyamine biosynthesis | Balances polyamine pools with catabolism |
| AZIN1 | Antizyme inhibitor 1, regulates ODC stability | Indirectly affects polyamine homeostasis |
| OAZ1 | Ornithine decarboxylase antizyme 1 | Regulates polyamine biosynthesis and transport |
| TP53 | p53 tumor suppressor, induces SAT1 during ferroptosis | Links diamine N-acetyltransferase activity to ferroptosis |
| NNMT | Nicotinamide N-methyltransferase | Metabolic regulator; knockdown protects against obesity |
| SLC3A2 | Cystine/glutamate antiporter subunit | Influences ferroptosis sensitivity |
| GPX4 | Glutathione peroxidase 4 | Key ferroptosis regulator interacting with polyamine metabolism |
| ACSL4 | Acyl-CoA synthetase long-chain family member 4 | Promotes lipid peroxidation in ferroptosis |
| ALOX15 | Arachidonate 15-lipoxygenase | Lipid peroxidation enzyme in ferroptosis |
| NFE2L2 | NRF2, oxidative stress response transcription factor | Modulates polyamine and redox balance |
| HIF1A | Hypoxia-inducible factor 1 subunit alpha | May influence polyamine metabolism in tumors |
| MYC | MYC proto-oncogene | Drives polyamine biosynthesis and is linked to catabolism |
| ATF4 | Activating transcription factor 4 | Integrated stress response regulator of metabolism |
| BECN1 | Beclin 1, autophagy regulator | Autophagy deficiency interacts with SAT1 in cancer |
| MAP1LC3B | LC3B, autophagosome marker | Used to assess autophagy in SAT1 studies |
How Is diamine N-acetyltransferase activity Regulated?
Diamine N-acetyltransferase activity is regulated at multiple levels. SAT1, the main human enzyme, is induced by polyamines, stress, and p53, and its activity is controlled by antizyme and polyamine analogs. The integrated stress response and autophagy status can also influence SAT1 expression and downstream polyamine catabolism, as seen in triple-negative breast cancer models. In addition, metabolic signals such as nicotinamide N-methyltransferase activity can affect related pathways and systemic energy balance.
diamine N-acetyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SAT1 | Cancer, ferroptosis, immunotherapy resistance | SAT1 knockout and overexpression cell lines |
| TP53 | Tumor suppression, ferroptosis | p53 point-mutation knock-in models |
| SMOX | Polyamine catabolism, oxidative stress | SMOX knockout cells |
| PAOX | Polyamine catabolism | PAOX knockout cells |
| NNMT | Obesity, metabolic dysfunction | NNMT knockdown or knockout models |
Cancer and immunotherapy resistance
Diamine N-acetyltransferase activity is dysregulated in multiple cancers. In hepatoma, efflux of N1-acetylspermidine produced by this activity fosters macrophage-mediated immune suppression and dampens immunotherapeutic efficacy. In triple-negative breast cancer, autophagy deficiency induced by SAT1 potentiates tumor progression. Activation of SAT1 also engages polyamine metabolism with p53-mediated ferroptotic responses, linking this activity to tumor suppression.
Acute kidney injury
Polyamine catabolism, including diamine N-acetyltransferase activity, is altered in acute kidney injury, where increased catabolism can contribute to tubular damage and oxidative stress. Targeting this pathway may offer therapeutic opportunities in renal injury.
Metabolic disease and obesity
Nicotinamide N-methyltransferase knockdown protects against diet-induced obesity, indicating that related metabolic pathways intersect with polyamine and acetyl-CoA metabolism. Although direct links between GO:0004145 and obesity remain to be fully defined, these findings highlight the broader metabolic importance of acetylation reactions.
From diamine N-acetyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of diamine N-acetyltransferase activity alter polyamine pools? | SAT1 knockout cell lines |
| Does a specific point mutation in SAT1 affect catalytic activity? | Point-mutation knock-in of SAT1 |
| Can tagged SAT1 be used to track localization? | Knock-in of epitope-tagged SAT1 |
| Does overexpression of SAT1 induce ferroptosis? | SAT1 overexpression cell lines |
| Does N1-acetylspermidine export affect macrophage function? | Co-culture with macrophages and SAT1-overexpressing hepatoma cells |
| Does autophagy deficiency synergize with SAT1 loss? | SAT1 knockout in autophagy-deficient backgrounds |
How to Study the diamine N-acetyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled acetyl-CoA assay | Enzymatic activity of diamine N-acetyltransferase | Kinetic studies and inhibitor testing |
| LC-MS/MS polyamine profiling | Levels of polyamines and acetylated derivatives | Metabolic phenotyping |
| RNA-seq | Transcriptional changes | Pathway analysis after SAT1 modulation |
| Proteomics | Protein expression and modifications | Identifying downstream effectors |
| Lipid peroxidation imaging | Ferroptosis induction | Assessing p53-SAT1 axis |
| Co-culture assays | Macrophage-mediated immune suppression | Tumor microenvironment studies |
| Immunofluorescence | Subcellular localization of SAT1 | Tagged knock-in validation |
| CRISPR screening | Genes affecting polyamine sensitivity | Identifying synthetic lethal interactions |
Enzymatic activity assays
Diamine N-acetyltransferase activity can be measured using radiolabeled acetyl-CoA or fluorescent substrates, followed by separation of acetylated products by thin-layer chromatography or HPLC. These assays are essential to confirm changes in catalytic activity after genetic manipulation.
Polyamine quantification
Mass spectrometry or HPLC-based methods quantify putrescine, spermidine, spermine, and their acetylated derivatives, providing a readout of pathway flux. Such measurements are critical for linking genotype to metabolic phenotype.
Transcriptomics and proteomics
RNA-seq and proteomics can reveal global changes in polyamine metabolism, ferroptosis, and immune signaling following modulation of diamine N-acetyltransferase activity. These approaches help identify downstream effectors and biomarkers.
Imaging and cell death assays
Ferroptosis can be monitored using lipid peroxidation sensors, viability assays, and inhibitors such as ferrostatin-1. Imaging of tagged SAT1 allows assessment of its subcellular localization and dynamics.
How CRISPR Can Be Used to Study GO:0004145 diamine N-acetyltransferase activity
Knockout
CRISPR knockout of SAT1 or related genes eliminates diamine N-acetyltransferase activity, allowing researchers to assess its contribution to polyamine homeostasis, ferroptosis, and tumor growth. Knockout models are essential for causal inference.
Point Mutation
Point mutations in the catalytic domain of SAT1 can be introduced to dissect substrate specificity and catalytic mechanism. Such models help distinguish loss-of-function from gain-of-function effects.
Knock-in
Knock-in of epitope-tagged SAT1 enables tracking of protein localization and interaction partners without altering endogenous regulation. This approach is valuable for studying dynamic changes in diamine N-acetyltransferase activity.
Overexpression
Overexpression of SAT1 or other diamine N-acetyltransferases can drive polyamine catabolism, induce ferroptosis, and modulate immune responses. Overexpression models are useful for gain-of-function studies and drug screening.
How EDITGENE Supports diamine N-acetyltransferase activity Research
Researchers studying diamine N-acetyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in polyamine metabolism, ferroptosis, or immune modulation. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for diamine N-acetyltransferase activity research.
Frequently Asked Questions About diamine N-acetyltransferase activity
What is diamine N-acetyltransferase activity?
It is the acetyl-CoA-dependent N-acetylation of alkane-alpha,omega-diamines such as putrescine, spermidine, and spermine, producing N-acetylated polyamines, CoA, and H+.
What genes are involved in diamine N-acetyltransferase activity?
SAT1 is the primary human gene encoding this activity, with related enzymes such as SMOX and PAOX participating in downstream catabolism.
What is the GO ID for diamine N-acetyltransferase activity?
The Gene Ontology ID is GO:0004145.
How is diamine N-acetyltransferase activity regulated?
It is regulated by polyamine levels, p53 signaling, antizyme, and stress-responsive pathways such as the integrated stress response.
What diseases are linked to diamine N-acetyltransferase activity?
It is linked to cancer, immunotherapy resistance, acute kidney injury, and metabolic dysfunction.
What is the role of SAT1 in ferroptosis?
SAT1 activation engages polyamine metabolism with p53-mediated ferroptotic responses, promoting lipid peroxidation and cell death.
How can I measure diamine N-acetyltransferase activity?
Enzymatic assays using radiolabeled acetyl-CoA or fluorescent substrates, combined with LC-MS/MS polyamine profiling, are commonly used.
What are the products of diamine N-acetyltransferase activity?
The products are an N-acetylalkane-alpha,omega-diamine, CoA, and H+; specific examples include N1-acetylspermidine and N1-acetylspermine.
Can diamine N-acetyltransferase activity affect the immune microenvironment?
Yes, N1-acetylspermidine exported from hepatoma cells can foster macrophage-mediated immune suppression and dampen immunotherapy efficacy.
What model systems are used to study diamine N-acetyltransferase activity?
CRISPR knockout, point-mutation knock-in, tagged knock-in, and overexpression cell models are widely used, along with co-culture and animal models.
Conclusion
Diamine N-acetyltransferase activity (GO:0004145) is a central metabolic function that controls polyamine catabolism and influences ferroptosis, immune modulation, and disease progression. Understanding its regulation and downstream effects requires precise genetic models and robust analytical methods. EDITGENE provides the necessary CRISPR tools to accelerate research on this important activity.
References
- 1. Liu ZY et al.. 2025. Efflux of N1-acetylspermidine from hepatoma fosters macrophage-mediated immune suppression to dampen immunotherapeutic efficacy.. Immunity 58(6):1572-1585.e10 PMID: 40460833
- 2. Kraus D et al.. 2014. Nicotinamide N-methyltransferase knockdown protects against diet-induced obesity.. Nature 508(7495):258-62 PMID: 24717514
- 3. Ou Y et al.. 2016. Activation of SAT1 engages polyamine metabolism with p53-mediated ferroptotic responses.. Proc Natl Acad Sci U S A 113(44):E6806-E6812 PMID: 27698118
- 4. Seiler N. 2004. Catabolism of polyamines.. Amino Acids 26(3):217-33 PMID: 15221502
- 5. Pegg AE. 2008. Spermidine/spermine-N(1)-acetyltransferase: a key metabolic regulator.. Am J Physiol Endocrinol Metab 294(6):E995-1010 PMID: 18349109
- 6. Tian W et al.. 2024. Autophagy Deficiency Induced by SAT1 Potentiates Tumor Progression in Triple-Negative Breast Cancer.. Adv Sci (Weinh) 11(36):e2309903 PMID: 39073262
- 7. Kang R et al.. 2019. The tumor suppressor protein p53 and the ferroptosis network.. Free Radic Biol Med 133:162-168 PMID: 29800655
- 8. Zahedi K et al.. 2019. Polyamine Catabolism in Acute Kidney Injury.. Int J Mol Sci 20(19) PMID: 31561575
