GO:1902562 H4 histone acetyltransferase complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902562 defines the H4 histone acetyltransferase complex, a cellular component capable of acetylating histone H4.
• The complex is conserved from yeast (NuA4) to humans (NuA4/TIP60) and includes catalytic subunits such as Esa1 in yeast and KAT5 (TIP60) in humans.
• H4 acetylation by this complex regulates transcription, DNA repair, and replication recovery.
• Structural studies reveal a modular architecture with distinct subunits for substrate recognition and catalysis.
• Dysregulation of the complex is linked to cancer and developmental disorders.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) are essential for dissecting subunit functions.
Description
The H4 histone acetyltransferase complex (GO:1902562) is a cellular component defined by its ability to acetylate histone H4. This complex is conserved across eukaryotes, with the yeast NuA4 complex and its human counterpart NuA4/TIP60 being well-characterized examples. It plays critical roles in chromatin remodeling, transcriptional activation, and DNA damage repair. Understanding its structure and function is vital for researchers studying epigenetic regulation and related diseases.
H4 histone acetyltransferase complex At A Glance
| GO ID | GO:1902562 |
|---|---|
| GO term | H4 histone acetyltransferase complex |
| Ontology | cellular_component |
| Synonym | Hpa3 complex, Hpa3 (homo-)dimer |
| Major function | H4 histone acetyltransferase activity |
| Conservation | Yeast to humans (NuA4/TIP60) |
| Catalytic subunits | Esa1 (yeast), KAT5/TIP60 (human) |
| Associated processes | Transcription, DNA repair, replication |
What Is GO:1902562?
The H4 histone acetyltransferase complex is a protein assembly that catalyzes the acetylation of histone H4, a modification that alters chromatin structure and gene expression. It is classified under the cellular component ontology and is synonymous with the Hpa3 complex or Hpa3 dimer.
Why Is H4 histone acetyltransferase complex Important in Cell Biology?
The H4 histone acetyltransferase complex is crucial for epigenetic regulation, influencing gene expression, DNA repair, and cell cycle progression. Its dysfunction is implicated in cancer and other diseases, making it a target for therapeutic development.
• Regulates chromatin structure and accessibility.
• Essential for transcriptional activation of specific genes.
• Plays a key role in DNA damage repair pathways.
• Required for replication recovery after topoisomerase I poisoning.
• Linked to chlorophyll biosynthesis and photosynthesis in plants.
• Dysregulation associated with cancer and developmental disorders.
• Target for epigenetic therapies.
• Conserved mechanism across eukaryotes.
What Happens During H4 histone acetyltransferase complex?
Substrate Recognition and Binding
In simple terms: The complex finds and binds to histone H4.
The H4 histone acetyltransferase complex recognizes histone H4 through specific subunits, facilitating acetylation of lysine residues. Structural studies show that the catalytic subunit interacts with the histone fold domain of H4.
Catalytic Acetylation
In simple terms: The complex adds acetyl groups to histone H4.
The catalytic subunit, such as Esa1 in yeast or KAT5 in humans, transfers acetyl groups from acetyl-CoA to lysine residues on histone H4, neutralizing positive charges and loosening chromatin.
Chromatin Remodeling
In simple terms: Acetylation opens up chromatin for gene activation.
Acetylation of H4 leads to chromatin decompaction, allowing access for transcription factors and other regulatory proteins.
Replication Recovery
In simple terms: The complex helps cells recover from DNA replication stress.
The NuA4 complex and H4 acetylation promote replication recovery after topoisomerase I poisoning, ensuring genome stability.
Key Genes Involved in GO:1902562 H4 histone acetyltransferase complex
Key genes encoding subunits of the H4 histone acetyltransferase complex are listed below.
| Gene | Major Role | Research Relevance |
|---|---|---|
| KAT5 (TIP60) | Catalytic subunit in humans | Target for cancer therapy |
| EP400 | Scaffold subunit in human NuA4 | Structural integrity |
| TRRAP | Adapter subunit | Recruits complex to chromatin |
| Esa1 | Catalytic subunit in yeast | Model for acetylation studies |
| Epl1 | Subunit of yeast NuA4 | Enhances catalytic activity |
| Yng2 | Subunit of yeast NuA4 | Required for complex assembly |
| Arp4 | Actin-related protein | Chromatin remodeling |
| Act1 | Actin | Structural role |
| Swc4 | Subunit of NuA4 | DNA damage response |
| Eaf1 | Subunit of NuA4 | Complex assembly |
| Eaf3 | Subunit of NuA4 | Transcriptional regulation |
| Eaf5 | Subunit of NuA4 | Complex stability |
| Eaf6 | Subunit of NuA4 | Histone acetylation |
| Eaf7 | Subunit of NuA4 | Complex function |
| Hat1 | Histone acetyltransferase | H4 acetylation in cytoplasm |
| Hat2 | Subunit of Hat1 complex | H4 interaction |
| Hpa3 | H4 acetyltransferase | Synonym for complex |
How Is H4 histone acetyltransferase complex Regulated?
The activity of the H4 histone acetyltransferase complex is regulated by its subunit composition and post-translational modifications. For example, KAT8 complex-dependent activity determines its role in transcription and cellular homeostasis.
H4 histone acetyltransferase complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| KAT5 | Cancer | Knockout cell lines |
| EP400 | Developmental disorders | Point mutation models |
| TRRAP | Cancer | Overexpression models |
| Esa1 | Genomic instability | Yeast knockout |
| Hat1 | Chromatin assembly | Knock-in models |
Cancer
Dysregulation of H4 histone acetyltransferase complex subunits, such as KAT5, is associated with various cancers, including breast and prostate cancer. Loss of acetylation can lead to genomic instability and tumor progression.
Developmental Disorders
Mutations in genes encoding complex subunits can cause developmental disorders due to impaired chromatin regulation.
Neurodegeneration
Altered H4 acetylation has been observed in neurodegenerative diseases, though direct links require further study.
From H4 histone acetyltransferase complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Effect of KAT5 loss on acetylation | Knockout cell line |
| Subunit interaction domains | Point mutation |
| Catalytic activity rescue | Knock-in of wild-type |
| Complex assembly dynamics | Tagged knock-in |
| Gain-of-function studies | Overexpression |
| Drug response | Patient-derived organoids |
How to Study the H4 histone acetyltransferase complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Cryo-EM | 3D structure | Complex architecture |
| Acetyltransferase assay | Enzyme activity | Catalytic function |
| ChIP-seq | Chromatin binding | Genome-wide localization |
| RNA-seq | Gene expression | Transcriptional changes |
| Mass spectrometry | Protein interactions | Subunit composition |
| CRISPR screening | Gene essentiality | Functional genomics |
| Immunofluorescence | Protein localization | Cellular distribution |
Structural Biology
Cryo-EM and X-ray crystallography have elucidated the architecture of the NuA4/TIP60 complex, revealing subunit arrangements.
Acetylation Assays
In vitro acetyltransferase assays using recombinant subunits measure catalytic activity toward histone H4.
Genomic Approaches
ChIP-seq and RNA-seq assess chromatin binding and transcriptional changes upon complex perturbation.
Proteomics
Mass spectrometry identifies subunit interactions and post-translational modifications.
How CRISPR Can Be Used to Study GO:1902562 H4 histone acetyltransferase complex
Knockout
CRISPR knockout of catalytic subunits like KAT5 abolishes H4 acetylation, enabling studies of downstream effects.
Point Mutation
Introducing point mutations in catalytic residues helps dissect enzymatic versus scaffolding functions.
Knock-in
Knock-in of tagged subunits allows for affinity purification and live-cell imaging.
Overexpression
Overexpression of subunits can reveal gain-of-function phenotypes and dominant-negative effects.
How EDITGENE Supports H4 histone acetyltransferase complex Research
Researchers studying H4 histone acetyltransferase complex-related genes often need to determine whether a candidate gene is causally involved in chromatin regulation and disease. EDITGENE provides comprehensive CRISPR services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for H4 histone acetyltransferase complex research.
Frequently Asked Questions About H4 histone acetyltransferase complex
What is the H4 histone acetyltransferase complex?
It is a protein complex that acetylates histone H4, involved in chromatin regulation and transcription.
What genes are involved in the H4 histone acetyltransferase complex?
Key genes include KAT5, EP400, TRRAP in humans, and Esa1, Epl1 in yeast.
What is the function of GO:1902562?
It enables H4 histone acetyltransferase activity, modifying chromatin structure.
How is the H4 histone acetyltransferase complex regulated?
Through subunit composition and post-translational modifications.
What diseases are associated with the H4 histone acetyltransferase complex?
Cancer and developmental disorders.
What are the synonyms for GO:1902562?
Hpa3 complex and Hpa3 (homo-)dimer.
What methods are used to study the H4 histone acetyltransferase complex?
Cryo-EM, acetyltransferase assays, ChIP-seq, and CRISPR screens.
What is the role of KAT5 in the complex?
KAT5 is the catalytic subunit in humans, acetylating histone H4.
How does the complex affect DNA repair?
It promotes replication recovery after topoisomerase I poisoning.
Can CRISPR be used to study the H4 histone acetyltransferase complex?
Yes, knockout, point mutation, knock-in, and overexpression models are available.
Conclusion
The H4 histone acetyltransferase complex (GO:1902562) is a central regulator of chromatin dynamics and gene expression. Its structural and functional characterization continues to reveal insights into epigenetic mechanisms and disease. CRISPR-based models are invaluable for further dissecting its roles.
References
- 1. Ji L et al.. 2022. Structure of the NuA4 histone acetyltransferase complex.. Proc Natl Acad Sci U S A 119(48):e2214313119 PMID: 36417436
- 2. Wu CJ et al.. 2024. Arabidopsis histone acetyltransferase complex coordinates cytoplasmic histone acetylation and nuclear chromatin accessibility.. Sci Adv 10(49):eadp1840 PMID: 39630902
- 3. Yang Z et al.. 2024. Structural insights into the human NuA4/TIP60 acetyltransferase and chromatin remodeling complex.. Science 385(6711):eadl5816 PMID: 39088653
- 4. Yue Y et al.. 2022. Topography of histone H3-H4 interaction with the Hat1-Hat2 acetyltransferase complex.. Genes Dev 36(7-8):408-413 PMID: 35393344
- 5. Zhou JX et al.. 2022. The Arabidopsis NuA4 histone acetyltransferase complex is required for chlorophyll biosynthesis and photosynthesis.. J Integr Plant Biol 64(4):901-914 PMID: 35043580
- 6. Noguchi C et al.. 2019. The NuA4 acetyltransferase and histone H4 acetylation promote replication recovery after topoisomerase I-poisoning.. Epigenetics Chromatin 12(1):24 PMID: 30992049
- 7. Zukin SA et al.. 2022. Structure and flexibility of the yeast NuA4 histone acetyltransferase complex.. Elife 11 PMID: 36263929
- 8. Radzisheuskaya A et al.. 2021. Complex-dependent histone acetyltransferase activity of KAT8 determines its role in transcription and cellular homeostasis.. Mol Cell 81(8):1749-1765.e8 PMID: 33657400
