GO:0031415 NatA complex: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0031415 (NatA complex) is a conserved N-terminal acetyltransferase that acetylates nascent proteins beginning with Ser, Ala, Gly, or Thr after Met cleavage.
• The core NatA holoenzyme consists of the catalytic subunit NAA10 and the auxiliary subunit NAA15, with NAA50 as an associated subunit in higher eukaryotes.
• NatA docks at the ribosomal polypeptide tunnel exit and is guided by the nascent polypeptide-associated complex (NAC) to co-translationally modify substrates.
• Mutations in NAA10 and NAA15 cause neurodevelopmental syndromes with intellectual disability, autism spectrum disorder, and congenital anomalies.
• NatA also functions in plants, where it regulates thermotolerance and systemic responses to root endophytic fungi.
• CRISPR knockout, point-mutation, knock-in, and overexpression models are essential for dissecting NatA subunit-specific functions in health and disease.
Description
The NatA complex (GO:0031415) is a conserved cellular component that catalyzes the transfer of an acetyl group to the N-terminal Ser, Ala, Gly, or Thr residue of a protein acceptor molecule. In Saccharomyces, the complex includes Nat1p and Ard1p and may contain additional proteins. This co-translational modification occurs on nascent polypeptides as they emerge from the ribosome, and NatA is recruited to the ribosomal tunnel exit through interactions with the nascent polypeptide-associated complex (NAC). Understanding NatA is critical because N-terminal acetylation influences protein stability, localization, and interactions, and disruptions in NatA subunits are linked to severe human disorders. Researchers studying NatA rely on precise genetic models to determine how individual subunits contribute to development and disease.
NatA complex At A Glance
| GO ID | GO:0031415 |
|---|---|
| GO term | NatA complex |
| Ontology | cellular_component |
| Synonym | N-terminal acetyltransferase A complex |
| Major function | Catalyzes N-terminal acetylation of Ser, Ala, Gly, or Thr residues on nascent proteins |
| Core subunits | NAA10 (catalytic), NAA15 (auxiliary), and NAA50 in higher eukaryotes |
| Localization | Ribosomal polypeptide tunnel exit, guided by NAC |
| Conservation | Conserved from yeast to humans; yeast Nat1p and Ard1p are orthologs of NAA15 and NAA10 |
| Associated factors | NAC, ribosome, and multi-factor complexes at the tunnel exit |
What Is GO:0031415?
The NatA complex is a conserved protein acetyltransferase complex that adds an acetyl group to the N-terminal amino group of proteins whose second residue is Ser, Ala, Gly, or Thr after removal of the initiator methionine. It is classified as a cellular component and is known as the N-terminal acetyltransferase A complex. The complex includes catalytic and auxiliary subunits, and in higher eukaryotes it associates with additional factors such as NAA50.
Why Is NatA complex Important in Cell Biology?
The NatA complex is essential for co-translational N-terminal acetylation, a modification that affects a large fraction of the proteome and influences protein folding, stability, and interactions. Dysregulation of NatA subunits is directly linked to neurodevelopmental disorders, including NAA10-related and NAA15-related syndromes characterized by intellectual disability, autism spectrum disorder, and congenital anomalies. In plants, NatA regulates thermotolerance and systemic responses to root endophytic fungi, highlighting its broad biological significance. Thus, NatA is a key node connecting protein biogenesis to organismal development and disease.
• NatA mediates co-translational N-terminal acetylation of proteins with Ser, Ala, Gly, or Thr after Met cleavage.
• Mutations in NAA10 cause NAA10-related neurodevelopmental syndrome with developmental delay and hemihypertrophy.
• Truncating variants in NAA15 are associated with intellectual disability, autism spectrum disorder, and congenital anomalies.
• NatA is recruited to the ribosome by NAC, forming multi-factor complexes at the polypeptide tunnel exit.
• The catalytic mechanism involves NAA10 and the auxiliary subunit NAA15, with NAA50 contributing to substrate specificity.
• In Arabidopsis, NatA subunit NAA15 interacts with SUF1 to regulate thermotolerance.
• NatA acts as a leaf-intrinsic brake on systemic responses induced by root endophytic fungi.
• NatA dysfunction can alter protein stability and cellular homeostasis, contributing to disease phenotypes.
• CRISPR-based models are crucial for studying subunit-specific roles of NatA in development and disease.
NatA complex: Biological Process, Structure, and Molecular Mechanism
Co-translational N-terminal acetylation
In simple terms: NatA attaches an acetyl tag to the start of new proteins as they are being made.
The NatA complex catalyzes the transfer of an acetyl group to the N-terminal Ser, Ala, Gly, or Thr residue of nascent polypeptides. This modification occurs co-translationally, meaning it happens while the protein is still being synthesized on the ribosome. NatA is positioned at the ribosomal polypeptide tunnel exit, where it can access the N-terminus of emerging chains.
Recruitment by NAC to the ribosome
In simple terms: A helper called NAC guides NatA to the ribosome so it can modify new proteins.
The nascent polypeptide-associated complex (NAC) guides a ribosomal multienzyme complex for nascent protein processing, including NatA. NatA engages in multi-factor complexes at the ribosomal polypeptide tunnel exit, ensuring efficient co-translational acetylation. This recruitment is essential for NatA to access its substrates as they emerge from the ribosome.
Core subunits and holoenzyme assembly
In simple terms: NatA is built from a catalytic subunit and a helper subunit that together form the active enzyme.
The core NatA holoenzyme consists of the catalytic subunit NAA10 and the auxiliary subunit NAA15. In higher eukaryotes, NAA50 is an associated subunit that forms the NatA/Naa50 complex. In Saccharomyces, the complex includes Nat1p and Ard1p, which are orthologs of NAA15 and NAA10, respectively. Additional proteins may associate with the complex in a context-dependent manner.
Catalytic mechanism and substrate specificity
In simple terms: The enzyme recognizes specific first amino acids and adds an acetyl group using a chemical reaction.
The structure and mechanism of acetylation by the N-terminal dual enzyme NatA/Naa50 complex have been elucidated, revealing how NAA10 catalyzes acetyl transfer and how NAA50 contributes to substrate specificity. NatA specifically targets N-termini with Ser, Ala, Gly, or Thr after initiator methionine removal. This specificity is determined by the active site architecture of NAA10 and its interaction with NAA15.
Regulation and associated factors
In simple terms: NatA activity can be tuned by interacting proteins and cellular conditions.
NatA engages in multi-factor complexes at the ribosomal tunnel exit, suggesting dynamic regulation by associated factors. In Arabidopsis, the UBA domain protein SUF1 interacts with NatA subunit NAA15 to regulate thermotolerance, indicating that NatA function can be modulated by stress-related proteins. Additionally, NatA acts as a leaf-intrinsic brake on systemic responses induced by root endophytic fungi, linking its activity to plant-microbe interactions.
Key Genes Involved in GO:0031415 NatA complex
The following genes and proteins are key components or interactors of the NatA complex, with established roles in its structure, function, and regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NAA10 | Catalytic subunit of NatA; acetylates N-termini of Ser/Ala/Gly/Thr proteins | Mutations cause NAA10-related neurodevelopmental syndrome |
| NAA15 | Auxiliary subunit of NatA; essential for complex stability and activity | Truncating variants linked to intellectual disability and autism |
| NAA50 | Associated subunit in higher eukaryotes; contributes to substrate specificity | Part of NatA/Naa50 dual enzyme complex |
| NAT1 | Yeast ortholog of NAA15; core subunit of NatA | Model for studying NatA assembly in yeast |
| ARD1 | Yeast ortholog of NAA10; catalytic subunit | Model for catalytic mechanism studies |
| NAC | Nascent polypeptide-associated complex; guides NatA to ribosome | Key for co-translational recruitment |
| SUF1 | UBA domain protein interacting with NAA15 in Arabidopsis | Regulates thermotolerance via NatA |
| Ribosome | Provides docking site for NatA at tunnel exit | Platform for co-translational acetylation |
| NAA10 p.N101K | Mutant form disrupting NatA complex | Associated with developmental delay and hemihypertrophy |
| NAA15 truncating variants | Loss-of-function variants | Cause variable intellectual disability and congenital anomalies |
| NAA10-related syndrome genes | Downstream targets of NatA acetylation | Phenotypic spectrum includes neurodevelopmental features |
| NAA15-related syndrome genes | Downstream targets of NatA acetylation | Phenotypic spectrum includes autism and anomalies |
| Endophytic fungi response genes | Regulated by NatA in leaves | NatA as a brake on systemic responses |
| Thermotolerance genes | Regulated by NatA-SUF1 interaction | Plant stress adaptation |
| Multi-factor complex components | Associate with NatA at tunnel exit | Regulation of co-translational processing |
| NatA substrate proteins | Acetylated by NatA | Proteome-wide impact of N-terminal acetylation |
How Is NatA complex Regulated?
NatA activity is regulated by its recruitment to the ribosome via NAC and by interactions with additional factors at the polypeptide tunnel exit. In Arabidopsis, the UBA domain protein SUF1 interacts with NAA15 to regulate thermotolerance, demonstrating that NatA can be modulated by stress-responsive proteins. Furthermore, NatA acts as a leaf-intrinsic brake on systemic responses induced by root endophytic fungi, indicating that its activity is integrated into plant-microbe signaling pathways. In humans, mutations such as NAA10 p.N101K disrupt the NatA complex, leading to developmental delay and hemihypertrophy, suggesting that complex integrity is critical for proper regulation.
NatA complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NAA10 | NAA10-related neurodevelopmental syndrome with developmental delay and hemihypertrophy | Knockout and point-mutation (p.N101K) cell models |
| NAA15 | Intellectual disability, autism spectrum disorder, congenital anomalies | Knockout and truncating variant knock-in models |
| NAA10/NAA15 | Neurodevelopmental phenotypes | Patient-derived iPSCs and CRISPR-corrected isogenic lines |
| NAA15/SUF1 | Thermotolerance in Arabidopsis | Plant knockout and overexpression models |
| NatA complex | Leaf systemic responses to endophytic fungi | Plant knockout and tagged knock-in lines |
NAA10-related neurodevelopmental syndrome
Mutations in NAA10, the catalytic subunit of NatA, cause a neurodevelopmental syndrome characterized by developmental delay, intellectual disability, and hemihypertrophy. The p.N101K mutation specifically disrupts the NatA complex and is associated with developmental delay and hemihypertrophy. Expanding the phenotypic spectrum of NAA10-related syndrome has revealed a broad range of clinical features, underscoring the importance of NatA in neurodevelopment.
NAA15-related neurodevelopmental syndrome
Truncating variants in NAA15, the auxiliary subunit of NatA, are associated with variable levels of intellectual disability, autism spectrum disorder, and congenital anomalies. The phenotypic spectrum of NAA15-related syndrome continues to expand, with patients presenting diverse neurodevelopmental and congenital features. These findings highlight the critical role of the NatA complex in brain development and morphogenesis.
NatA in plant stress and symbiosis
In Arabidopsis, the NatA complex subunit NAA15 interacts with SUF1 to regulate thermotolerance, linking NatA to heat stress responses. Additionally, NatA acts as a leaf-intrinsic brake on systemic responses induced by root endophytic fungi, indicating a role in plant-microbe symbiosis. These plant studies demonstrate that NatA functions extend beyond development to environmental adaptation.
From NatA complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the effect of NAA10 loss on cell viability? | NAA10 knockout cell line (e.g., HEK293 or iPSCs) |
| How does NAA10 p.N101K mutation affect NatA complex assembly? | Point-mutation knock-in of NAA10 p.N101K |
| Does NAA15 truncation alter substrate acetylation? | NAA15 truncating variant knock-in |
| Where does NatA localize in cells? | Tagged knock-in of NAA10 or NAA15 with fluorescent tag |
| What happens when NAA10 is overexpressed? | Overexpression cell model with inducible promoter |
| How does NatA regulate plant thermotolerance? | Arabidopsis NAA15 knockout and SUF1 interaction mutants |
How to Study the NatA complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Ribo-seq | Genome-wide translation and ribosome occupancy | Studying co-translational acetylation defects |
| N-terminomics | N-terminal peptide enrichment and acetylation status | Identifying NatA substrates |
| RNA-seq | Transcriptional changes | Analyzing gene expression in NatA mutants |
| Proteomics | Protein abundance and modifications | Quantifying NatA-dependent protein stability |
| Fluorescence microscopy | Subcellular localization of tagged NatA subunits | Visualizing ribosome association |
| CRISPR screening | Phenotypic effects of gene knockouts | Identifying modifiers of NatA-related phenotypes |
| Co-immunoprecipitation | Protein-protein interactions | Mapping NatA complex interactors |
| Structural biology (cryo-EM) | 3D structure of NatA and ribosome complexes | Understanding catalytic mechanism |
Ribosome profiling (Ribo-seq)
Ribo-seq measures translation genome-wide and can reveal changes in co-translational processing when NatA is perturbed. It is particularly useful for studying how NatA recruitment to the ribosome affects nascent chain handling.
Proteomics and N-terminomics
Mass spectrometry-based proteomics, including N-terminomics, can identify NatA substrates and quantify changes in N-terminal acetylation upon NatA subunit knockout or mutation. This approach provides a global view of NatA target proteins.
RNA-seq and transcriptomics
RNA-seq can reveal transcriptional changes resulting from NatA dysfunction, including compensatory pathways and disease-relevant gene expression signatures. It is often combined with proteomics to link transcript and protein levels.
Imaging and localization studies
Fluorescence microscopy of tagged NatA subunits (e.g., GFP-NAA10) can visualize localization at the ribosome and other cellular structures. Live-cell imaging can track dynamic recruitment to the polypeptide tunnel exit.
How CRISPR Can Be Used to Study GO:0031415 NatA complex
Knockout
CRISPR knockout of NAA10 or NAA15 can abolish NatA activity, leading to loss of N-terminal acetylation on target proteins. These models are used to study the consequences of NatA loss on cell viability, differentiation, and disease-related phenotypes.
Point Mutation
Point mutations such as NAA10 p.N101K can be introduced via CRISPR to model patient-specific variants that disrupt the NatA complex. These models help dissect how specific amino acid changes affect complex assembly and substrate acetylation.
Knock-in
Knock-in of tagged NatA subunits (e.g., GFP or HA tags) allows visualization and purification of the complex for interaction and localization studies. Truncating variants of NAA15 can also be knocked in to model patient mutations.
Overexpression
Overexpression of NAA10 or NAA15 can be achieved by CRISPR-mediated insertion of inducible promoters or by lentiviral delivery. These models are useful for studying gain-of-function effects and for producing large amounts of NatA complex for biochemical assays.
How EDITGENE Supports NatA complex Research
Researchers studying NatA complex-related genes often need to determine whether a candidate gene is causally involved in neurodevelopmental disorders, protein homeostasis, or plant stress responses. Precise genetic models are essential to link specific mutations in NAA10, NAA15, or associated factors to functional outcomes. EDITGENE provides end-to-end CRISPR services to accelerate this discovery process.
Contact EDITGENE today to design your custom CRISPR model for NatA complex research.
Frequently Asked Questions About NatA complex
What is the NatA complex?
The NatA complex (GO:0031415) is a conserved N-terminal acetyltransferase that adds an acetyl group to Ser, Ala, Gly, or Thr residues of nascent proteins.
What genes are involved in the NatA complex?
Key genes include NAA10 (catalytic subunit), NAA15 (auxiliary subunit), and NAA50 (associated subunit in higher eukaryotes).
What is the function of GO:0031415?
GO:0031415 catalyzes co-translational N-terminal acetylation of proteins with specific N-terminal residues, influencing protein stability and interactions.
How is NatA recruited to the ribosome?
NatA is guided to the ribosomal polypeptide tunnel exit by the nascent polypeptide-associated complex (NAC).
What diseases are associated with NatA complex mutations?
Mutations in NAA10 and NAA15 cause neurodevelopmental syndromes with intellectual disability, autism spectrum disorder, and congenital anomalies.
What is NAA10-related neurodevelopmental syndrome?
It is a disorder caused by NAA10 mutations, characterized by developmental delay, intellectual disability, and hemihypertrophy.
What is NAA15-related neurodevelopmental syndrome?
It is a condition linked to NAA15 truncating variants, presenting with variable intellectual disability, autism, and congenital anomalies.
How can I study the NatA complex in the lab?
Common methods include CRISPR knockout/knock-in, Ribo-seq, N-terminomics, proteomics, and fluorescence imaging.
Does NatA function in plants?
Yes, in Arabidopsis NatA regulates thermotolerance via NAA15-SUF1 interaction and acts as a brake on systemic responses to root endophytic fungi.
What CRISPR models are available for NatA research?
EDITGENE offers knockout, point-mutation, knock-in, tagged knock-in, and overexpression models for NAA10, NAA15, and related genes.
Conclusion
The NatA complex (GO:0031415) is a central co-translational modifier that acetylates nascent proteins and is essential for normal development and cellular homeostasis. Its subunits NAA10 and NAA15 are linked to severe neurodevelopmental disorders, and its functions extend to plant stress responses and symbiosis. Continued research using precise CRISPR models will further illuminate the molecular mechanisms and therapeutic potential of targeting NatA in disease.
References
- 1. Lyon GJ et al.. 2023. Expanding the phenotypic spectrum of NAA10-related neurodevelopmental syndrome and NAA15-related neurodevelopmental syndrome.. Eur J Hum Genet 31(7):824-833 PMID: 37130971
- 2. Lentzsch AM et al.. 2024. NAC guides a ribosomal multienzyme complex for nascent protein processing.. Nature 633(8030):718-724 PMID: 39169182
- 3. Cheng H et al.. 2018. Truncating Variants in NAA15 Are Associated with Variable Levels of Intellectual Disability, Autism Spectrum Disorder, and Congenital Anomalies.. Am J Hum Genet 102(5):985-994 PMID: 29656860
- 4. Deng S et al.. 2019. Structure and Mechanism of Acetylation by the N-Terminal Dual Enzyme NatA/Naa50 Complex.. Structure 27(7):1057-1070.e4 PMID: 31155310
- 5. Song ZT et al.. 2022. UBA domain protein SUF1 interacts with NatA-complex subunit NAA15 to regulate thermotolerance in Arabidopsis.. J Integr Plant Biol 64(7):1297-1302 PMID: 35524486
- 6. Klein M et al.. 2026. NatA engages in multi-factor complexes at the ribosomal polypeptide tunnel exit.. Nat Commun 17(1):884 PMID: 41577663
- 7. McTiernan N et al.. 2021. NAA10 p.(N101K) disrupts N-terminal acetyltransferase complex NatA and is associated with developmental delay and hemihypertrophy.. Eur J Hum Genet 29(2):280-288 PMID: 32973342
- 8. Chen XJ et al.. 2026. NatA complex is a leaf-intrinsic brake on systemic responses induced by root endophytic fungi.. Proc Natl Acad Sci U S A 123(34):e2536998123 PMID: 42611998
