GO:0044016 histone H3K4 acetyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0044016 describes the enzymatic activity that transfers an acetyl group from acetyl-CoA to lysine 4 of histone H3, producing H3K4ac and CoA.
• This activity is carried out by MYST-family histone acetyltransferases, most notably the HBO1 (KAT7) complex, which requires JADE subunit cofactors for substrate specificity.
• H3K4 acetylation is mechanistically linked to H3K4 methylation: NSL complex-mediated acetylation promotes MLL/SET-dependent H3K4 di-methylation, and H3K4me3 influences pre-mRNA splicing [3,8].
• Dysregulation of H3K4 acetylation contributes to cohesinopathies, leukemia, and other cancers through altered chromatin states and transcriptional programs [1,5,7].
• CRISPR knockout, point-mutation, knock-in, and overexpression models enable causal dissection of H3K4 acetyltransferase genes and their complexes [2,8].
• EDITGENE provides end-to-end CRISPR cell model and library screening services to study GO:0044016-related chromatin regulators.
Description
Histone H3 lysine 4 acetylation (H3K4ac) is a chromatin modification that marks active regulatory regions and participates in the crosstalk between histone acetylation and methylation. The Gene Ontology term GO:0044016, histone H3K4 acetyltransferase activity, defines the enzymatic reaction that deposits this mark: acetyl-CoA + histone H3 L-lysine (position 4) = CoA + histone H3 N6-acetyl-L-lysine (position 4). This activity is essential for normal gene expression programs and is emerging as a key node in developmental and cancer biology [2,3]. Researchers study GO:0044016 because it sits at the interface of chromatin modification, transcription, and RNA processing. The HBO1 (KAT7) complex is a principal H3K4 acetyltransferase in human cells, and its JADE subunits dictate substrate selection and complex assembly. Beyond HBO1, the NSL complex provides H3K4 acetylation that stimulates MLL/SET-mediated H3K4 di-methylation, illustrating a direct enzymatic crosstalk between acetylation and methylation machineries. H3K4 trimethylation, a related mark, further couples to pre-mRNA splicing, underscoring the broad impact of H3K4 modification states on gene regulation. Given its role in chromatin and disease, GO:0044016 is a compelling target for functional genomics. Loss-of-function and gain-of-function models of H3K4 acetyltransferase components reveal how this activity shapes transcriptional outputs, cell identity, and oncogenic transformation [1,5,7]. This article synthesizes the current understanding of GO:0044016 and outlines CRISPR-based strategies to interrogate it.
histone H3K4 acetyltransferase activity At A Glance
| GO ID | GO:0044016 |
|---|---|
| GO term | histone H3K4 acetyltransferase activity |
| Ontology | molecular_function |
| Synonym | histone acetylase activity (H3-K4 specific); histone acetyltransferase activity (H3-K4 specific); histone H3-K4 acetyltransferase activity; histone lysine N-acetyltransferase activity (H3-K4 specific) |
| Major function | Catalyzes acetylation of histone H3 at lysine 4 using acetyl-CoA, generating H3K4ac and CoA |
| Reaction | acetyl-CoA + histone H3 L-lysine (position 4) = CoA + histone H3 N6-acetyl-L-lysine (position 4) |
| Representative enzyme complex | HBO1 (KAT7) complex with JADE subunits; NSL complex [2,8] |
| Crosstalk | H3K4 acetylation promotes MLL/SET-mediated H3K4 di-methylation and is linked to H3K4me3 and splicing [3,8] |
What Is GO:0044016?
GO:0044016, histone H3K4 acetyltransferase activity, is a molecular function defined as the catalysis of the reaction: acetyl-CoA + histone H3 L-lysine (position 4) = CoA + histone H3 N6-acetyl-L-lysine (position 4). In other words, it is the enzyme activity that acetylates histone H3 at lysine 4, using acetyl-CoA as the acetyl donor. This activity is distinct from histone methyltransferase activities that modify the same residue, although the two can functionally interact.
Why Is histone H3K4 acetyltransferase activity Important in Cell Biology?
GO:0044016 is important because H3K4 acetylation is a central chromatin mark that influences transcription, replication, and RNA processing. The HBO1 complex, a major H3K4 acetyltransferase, is targeted by JADE subunits that guide its function, and its dysregulation is implicated in cancer and developmental disorders. Moreover, H3K4 acetylation directly stimulates H3K4 methylation by MLL/SET complexes, linking two major epigenetic pathways. Because H3K4 methylation states are associated with pre-mRNA splicing and leukemogenesis, understanding GO:0044016 provides mechanistic insight into gene regulation and disease [3,7].
• H3K4 acetylation by HBO1/JADE complexes regulates chromatin accessibility and gene expression programs.
• NSL complex-mediated H3K4 acetylation promotes MLL/SET-dependent H3K4 di-methylation, a key epigenetic crosstalk.
• H3K4 trimethylation, functionally linked to H3K4 acetylation, influences pre-mRNA splicing.
• Cohesinopathies involve mutations in chromatin regulators that can affect H3K4 modification states.
• NUP98 oncofusions selectively partition transcriptional coactivators, including histone acetyltransferases, into condensates.
• MLL1 methyltransferase activity is dispensable for hematopoiesis and leukemogenesis, highlighting the importance of non-methylation functions such as acetylation.
• H3K4 acetylation is a potential biomarker and therapeutic target in cancers with aberrant chromatin modifier expression [2,5].
• CRISPR screens targeting H3K4 acetyltransferase genes can identify vulnerabilities in cancer cells [2,8].
• Understanding GO:0044016 aids in interpreting epigenomic data and designing epigenetic therapies [3,6].
• Modeling H3K4 acetyltransferase activity in cells enables drug discovery and mechanistic studies [2,8].
What Happens During histone H3K4 acetyltransferase activity?
Substrate recognition and binding
In simple terms: The enzyme first finds and grabs the histone H3 tail near lysine 4.
H3K4 acetyltransferases must recognize the histone H3 N-terminal tail and specifically bind lysine 4. The HBO1 complex achieves this specificity through its JADE subunits, which guide the complex to appropriate substrates and chromatin regions. This step ensures that acetylation occurs at the correct residue and in the right genomic context.
Acetyl transfer from acetyl-CoA
In simple terms: The enzyme takes an acetyl group from acetyl-CoA and attaches it to lysine 4.
The catalytic step involves transfer of an acetyl group from acetyl-CoA to the epsilon-amino group of histone H3 lysine 4, yielding CoA and H3K4 N6-acetyl-L-lysine. This reaction neutralizes the positive charge of lysine 4, potentially altering chromatin structure and creating a docking site for reader proteins.
Crosstalk with H3K4 methylation
In simple terms: Acetylation at H3K4 helps another enzyme add methyl groups to the same residue.
NSL complex-mediated H3K4 acetylation promotes the di-methylation activity of MLL/SET complexes on histone H3K4. This functional interplay means that H3K4 acetylation can prime the residue for subsequent methylation, integrating two major epigenetic marks.
Impact on transcription and splicing
In simple terms: The mark influences how genes are turned on and how their RNA messages are processed.
H3K4 acetylation and the associated H3K4 methylation states are linked to active transcription and pre-mRNA splicing. The dynamic interplay between H3K4 trimethylation and splicing factors suggests that H3K4 acetyltransferase activity contributes to co-transcriptional RNA processing.
Complex assembly and regulation
In simple terms: The enzyme works as part of a larger machine that can be assembled and regulated in different ways.
The HBO1 complex function is guided by JADE subunit composition, which determines substrate specificity and complex integrity. Additionally, oncofusions such as NUP98 can form condensates that selectively partition transcriptional coactivators, potentially altering H3K4 acetylation dynamics.
Key Genes Involved in GO:0044016 histone H3K4 acetyltransferase activity
The following genes encode proteins that carry out, regulate, or functionally interact with histone H3K4 acetyltransferase activity (GO:0044016) and its associated complexes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| KAT7 (HBO1) | Catalytic subunit of the HBO1 histone acetyltransferase complex with H3K4 specificity | Central enzyme for GO:0044016; target for knockout and inhibitor studies |
| JADE1 | Subunit of HBO1 complex that guides substrate specificity and complex assembly | Determines H3K4 acetylation targeting; knockout alters chromatin state |
| JADE2 | Subunit of HBO1 complex involved in substrate recognition | Modulates HBO1 activity and gene expression programs |
| JADE3 | Subunit of HBO1 complex contributing to complex function | Potential regulator of H3K4 acetylation in specific contexts |
| KAT2A (GCN5) | Histone acetyltransferase that can acetylate H3K4 in some contexts | Related HAT with overlapping functions; useful for comparative studies |
| KAT2B (PCAF) | Histone acetyltransferase with H3K4 acetylation capability | Implicated in chromatin regulation and crosstalk with methylation |
| KMT2A (MLL1) | Histone H3K4 methyltransferase that functionally interacts with H3K4 acetylation | Methyltransferase activity is dispensable for hematopoiesis, highlighting acetylation crosstalk |
| KMT2D (MLL2) | Histone H3K4 methyltransferase | Mutations cause Kabuki syndrome; interacts with H3K4 acetylation pathways |
| NSL complex components (KANSL1, KANSL2, KANSL3) | Non-specific lethal complex that promotes H3K4 acetylation and stimulates MLL/SET methylation | Key mediators of acetylation-methylation crosstalk |
| MLL/SET complex components (WDR5, RBBP5, ASH2L) | Core subunits of MLL/SET methyltransferase complexes | Required for H3K4 di-methylation downstream of acetylation |
| NUP98 | Forms oncofusions that condensate and partition transcriptional coactivators | Relevant to leukemogenesis and HAT recruitment |
| SMC1A | Cohesin subunit mutated in cohesinopathies | Links chromatin regulator dysfunction to developmental disorders |
| SMC3 | Cohesin subunit mutated in cohesinopathies | Affects chromatin architecture and H3K4 modification states |
| STAG1/STAG2 | Cohesin subunits | Mutations in cohesinopathies and cancers |
| HDAC1/HDAC2 | Histone deacetylases that remove acetylation marks | Counterbalance H3K4 acetylation; targets for combination studies |
| BRPF1 | Scaffold protein in HBO1 complex | Required for HBO1 complex integrity and H3K4 acetylation |
| ING4/ING5 | Subunits of HBO1 complex | Modulate complex activity and targeting |
How Is histone H3K4 acetyltransferase activity Regulated?
Histone H3K4 acetyltransferase activity is regulated at multiple levels. The composition of the HBO1 complex, particularly the JADE subunit identity, dictates substrate specificity and catalytic output. Crosstalk with methylation machinery provides another layer: NSL complex-mediated acetylation stimulates MLL/SET-dependent H3K4 di-methylation, creating a positive feedback loop between acetylation and methylation. Additionally, oncofusions such as NUP98 can form biomolecular condensates that selectively partition transcriptional coactivators, potentially altering the local concentration and activity of H3K4 acetyltransferases. These regulatory mechanisms ensure that H3K4 acetylation is tightly coupled to transcriptional states and developmental cues.
histone H3K4 acetyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| KAT7 (HBO1) | Cancer, leukemia; chromatin dysregulation | Knockout and point-mutation cell lines; xenograft models |
| JADE1/2/3 | Cancer; altered H3K4 acetylation | Knockout and overexpression models to study complex assembly |
| NUP98 | Leukemia; oncofusion condensates | Knock-in of NUP98 fusions; condensate imaging |
| KMT2D | Kabuki syndrome; developmental disorders | Patient-derived iPSCs; knockout models |
| SMC1A/SMC3 | Cohesinopathies; developmental defects | Knockout and point-mutation models in cell lines |
Cancer and leukemia
Dysregulation of H3K4 acetylation is implicated in leukemia and other cancers. NUP98 oncofusions form condensates that selectively partition transcriptional coactivators, including histone acetyltransferases, thereby altering chromatin landscapes and promoting leukemogenesis. MLL1 methyltransferase activity is dispensable for hematopoiesis and leukemogenesis, suggesting that non-methylation functions, such as acetylation crosstalk, may be critical. Targeting H3K4 acetyltransferase complexes could therefore offer therapeutic opportunities in hematological malignancies.
Cohesinopathies and developmental disorders
Cohesinopathies are caused by mutations in cohesin complex genes such as SMC1A and SMC3, leading to developmental defects. These mutations can disrupt chromatin architecture and affect H3K4 modification states, linking GO:0044016-related pathways to developmental disease. Understanding how H3K4 acetylation is altered in cohesinopathies may reveal new therapeutic targets.
Kabuki syndrome and KMT2D mutations
KMT2D (MLL2) is a histone H3K4 methyltransferase whose mutations cause Kabuki syndrome. Although KMT2D directly methylates H3K4, its function is intertwined with H3K4 acetylation through crosstalk mechanisms. This highlights how disruptions in H3K4 modification pathways, including acetylation, contribute to developmental disorders.
Splicing-related diseases
H3K4 trimethylation dynamically interacts with pre-mRNA splicing, and perturbations in this interplay can contribute to disease. Since H3K4 acetylation promotes H3K4 methylation, defects in H3K4 acetyltransferase activity may indirectly affect splicing fidelity and contribute to splicing-related pathologies.
From histone H3K4 acetyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of KAT7 abolish H3K4 acetylation? | CRISPR knockout of KAT7 in HEK293 or cancer cell lines |
| How do JADE subunits dictate substrate specificity? | Knockout of individual JADE genes followed by H3K4ac profiling |
| Does a point mutation in the catalytic domain affect acetyltransferase activity? | CRISPR point-mutation knock-in of catalytic residues in KAT7 |
| How does H3K4 acetylation crosstalk with methylation? | Knock-in of H3K4 mutants or NSL complex knockouts |
| Can overexpression of HBO1 complex drive oncogenic transformation? | Overexpression of KAT7/JADE in primary or immortalized cells |
| Do NUP98 oncofusions alter H3K4 acetylation dynamics? | Knock-in of NUP98 fusion genes and condensate assays |
How to Study the histone H3K4 acetyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ChIP-seq | Genomic localization of H3K4ac | Profiling changes after KAT7 knockout |
| Mass spectrometry | Histone modification stoichiometry | Quantifying H3K4ac and crosstalk with methylation |
| RNA-seq | Transcript abundance and splicing | Assessing transcriptional impact of H3K4 acetylation loss |
| CRISPR knockout screens | Gene essentiality and modifier identification | Discovering regulators of H3K4 acetylation |
| Western blot | Protein levels and modification status | Validating H3K4ac changes in mutant cells |
| Immunofluorescence | Subcellular localization and condensates | Studying NUP98 fusion condensates |
| Co-immunoprecipitation | Protein-protein interactions | Mapping HBO1 complex assembly |
| In vitro acetyltransferase assay | Enzymatic activity | Measuring catalytic activity of wild-type vs mutant enzymes |
Chromatin immunoprecipitation sequencing (ChIP-seq)
ChIP-seq using anti-H3K4ac antibodies measures the genomic distribution of H3K4 acetylation. This method is essential to determine how knockout or mutation of H3K4 acetyltransferase genes (e.g., KAT7, JADE subunits) alters the landscape of this mark [2,8].
Mass spectrometry-based proteomics
Quantitative mass spectrometry can detect and quantify histone modifications, including H3K4ac, in response to genetic perturbations. This approach provides stoichiometric information and can reveal crosstalk with methylation.
RNA sequencing (RNA-seq)
RNA-seq measures transcriptional changes upon manipulation of H3K4 acetyltransferase activity. It helps link the enzymatic activity to gene expression programs and splicing events.
CRISPR screening
Genome-wide CRISPR knockout or activation screens can identify genes that modulate H3K4 acetylation levels or that are synthetic lethal with H3K4 acetyltransferase loss. Such screens are powerful for discovering novel regulators and therapeutic targets [2,8].
How CRISPR Can Be Used to Study GO:0044016 histone H3K4 acetyltransferase activity
Knockout
CRISPR knockout of KAT7, JADE subunits, or NSL complex components abolishes or reduces H3K4 acetyltransferase activity, enabling loss-of-function studies. These models are used to assess effects on chromatin state, transcription, and cell viability [2,8].
Point Mutation
CRISPR point mutation can introduce catalytic-dead mutations in the acetyltransferase domain of KAT7 or other HATs. Such models distinguish enzymatic activity from scaffolding functions and help define the specific contribution of GO:0044016 to phenotype.
Knock-in
Knock-in of epitope tags (e.g., FLAG, HA) into endogenous KAT7 or JADE genes allows for affinity purification and ChIP studies. Knock-in of disease-associated mutations (e.g., in KMT2D) can model Kabuki syndrome and other disorders.
Overexpression
CRISPR activation (CRISPRa) or cDNA overexpression of KAT7/JADE subunits can drive elevated H3K4 acetylation, useful for gain-of-function studies and for testing oncogenic potential [2,5].
How EDITGENE Supports histone H3K4 acetyltransferase activity Research
Researchers studying histone H3K4 acetyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in chromatin regulation, transcriptional control, or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional interrogation of GO:0044016 and its associated pathways.
Contact EDITGENE today to design your custom CRISPR model for histone H3K4 acetyltransferase activity research.
Frequently Asked Questions About histone H3K4 acetyltransferase activity
What is histone H3K4 acetyltransferase activity?
It is the enzymatic activity defined by GO:0044016 that transfers an acetyl group from acetyl-CoA to lysine 4 of histone H3, producing H3K4ac and CoA.
What genes are involved in histone H3K4 acetyltransferase activity?
Key genes include KAT7 (HBO1), JADE1/2/3, NSL complex components, and other histone acetyltransferases such as KAT2A and KAT2B [2,8].
Which enzyme complex carries out H3K4 acetylation?
The HBO1 (KAT7) complex is a major H3K4 acetyltransferase, with JADE subunits guiding its specificity and function.
How is H3K4 acetylation related to H3K4 methylation?
NSL complex-mediated H3K4 acetylation promotes MLL/SET-dependent H3K4 di-methylation, demonstrating crosstalk between the two marks.
What diseases are associated with H3K4 acetyltransferase dysfunction?
Dysregulation is linked to leukemia, cohesinopathies, Kabuki syndrome, and other cancers through altered chromatin states [1,4,5,7].
How can I study histone H3K4 acetyltransferase activity in the lab?
Common methods include ChIP-seq for H3K4ac, mass spectrometry, RNA-seq, and CRISPR knockout or point-mutation models [2,3,6].
What is the role of JADE subunits in H3K4 acetylation?
JADE subunits guide the HBO1 complex to specific substrates and chromatin regions, determining H3K4 acetylation patterns.
Can CRISPR be used to model H3K4 acetyltransferase mutations?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression are all applicable to study genes like KAT7 and JADE1 [2,8].
Is H3K4 acetylation important for splicing?
H3K4 trimethylation, which is functionally linked to acetylation, dynamically interacts with pre-mRNA splicing.
What services does EDITGENE offer for H3K4 acetyltransferase research?
EDITGENE provides CRISPR knockout, point mutation, knock-in, overexpression cell models, library screening, and bioinformatics analysis for chromatin targets [2,8].
Conclusion
GO:0044016, histone H3K4 acetyltransferase activity, is a fundamental chromatin-modifying function that bridges acetylation and methylation pathways to control gene expression and RNA processing. Its dysregulation is implicated in cancer, developmental disorders, and cohesinopathies, making it a high-value target for functional genomics [1,2,3,5,7]. By leveraging CRISPR-based models and multi-omics approaches, researchers can dissect the precise roles of H3K4 acetyltransferases and their complexes in health and disease [2,8]. EDITGENE stands ready to support these efforts with tailored cell model and screening services.
References
- 1. Piché J et al.. 2019. The expanding phenotypes of cohesinopathies: one ring to rule them all!. Cell Cycle 18(21):2828-2848 PMID: 31516082
- 2. Gaurav N et al.. 2024. Guiding the HBO1 complex function through the JADE subunit.. Nat Struct Mol Biol 31(7):1039-1049 PMID: 38448574
- 3. Davie JR et al.. 2016. Histone H3K4 trimethylation: dynamic interplay with pre-mRNA splicing.. Biochem Cell Biol 94(1):1-11 PMID: 26352678
- 4. Froimchuk E et al.. 2017. Histone H3 lysine 4 methyltransferase KMT2D.. Gene 627:337-342 PMID: 28669924
- 5. Ahn JH et al.. 2025. The phenylalanine-and-glycine repeats of NUP98 oncofusions form condensates that selectively partition transcriptional coactivators.. Mol Cell 85(4):708-725.e9 PMID: 39922194
- 6. Trush VV et al.. 2022. Enzymatic nucleosome acetylation selectively affects activity of histone methyltransferases in vitro.. Biochim Biophys Acta Gene Regul Mech 1865(5):194845 PMID: 35907431
- 7. Mishra BP et al.. 2014. The histone methyltransferase activity of MLL1 is dispensable for hematopoiesis and leukemogenesis.. Cell Rep 7(4):1239-47 PMID: 24813891
- 8. Zhao X et al.. 2013. Crosstalk between NSL histone acetyltransferase and MLL/SET complexes: NSL complex functions in promoting histone H3K4 di-methylation activity by MLL/SET complexes.. PLoS Genet 9(11):e1003940 PMID: 24244196
