GO:0070566 adenylyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0070566 adenylyltransferase activity is defined as catalysis of the transfer of an adenylyl group to an acceptor.
• Adenylyltransferases use ATP or NAD+ as adenylyl donors and modify diverse acceptors including proteins, small molecules, and nucleic acids.
• Key human enzymes include NMNAT1-3, Fhit, and SARM1, which regulate NAD+ metabolism, axon degeneration, and innate immunity.
• Bacterial adenylyltransferases such as those acting on Rho GTPases are virulence factors that subvert host cell signaling.
• Dysregulation of adenylyltransferase activity is linked to neurodegeneration, cancer, and infectious disease.
• CRISPR knockout, point-mutation, and knock-in models are essential to dissect the catalytic and non-catalytic roles of these enzymes.
Description
Adenylyltransferase activity (GO:0070566) is a fundamental enzymatic function that transfers an adenylyl group (AMP) from a donor molecule to a specific acceptor. This modification can occur on proteins, small molecules, or nucleic acids, and it often serves as a regulatory switch or a step in cofactor biosynthesis. The reaction is central to cellular processes such as NAD+ homeostasis, signal transduction, and host-pathogen interactions. Researchers study adenylyltransferases to understand how post-translational modifications control protein function and how pathogens exploit these enzymes to manipulate host cells. The term encompasses a wide range of enzymes, including nicotinamide mononucleotide adenylyltransferases (NMNATs), Fhit proteins, and bacterial AMPylases. Because adenylyltransferases are involved in diverse pathways, they are attractive targets for therapeutic intervention in cancer, neurodegeneration, and infectious diseases.
adenylyltransferase activity At A Glance
| GO ID | GO:0070566 |
|---|---|
| GO term | adenylyltransferase activity |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Catalysis of the transfer of an adenylyl group to an acceptor |
| Common donors | ATP, NAD+ |
| Common acceptors | Proteins, small molecules, nucleic acids |
| Example enzymes | NMNAT1-3, Fhit, SARM1, bacterial AMPylases |
| Related diseases | Neurodegeneration, cancer, infectious disease |
What Is GO:0070566?
According to the Gene Ontology, GO:0070566 adenylyltransferase activity is defined as the catalysis of the transfer of an adenylyl group to an acceptor. This activity typically uses ATP or NAD+ as the adenylyl donor and results in the covalent attachment of AMP to a substrate. The acceptor can be a protein (e.g., AMPylation), a small molecule (e.g., NMN), or another molecule. The term is classified as a molecular function and is distinct from other transferase activities by its specific adenylyl group donor and acceptor chemistry.
Why Is adenylyltransferase activity Important in Cell Biology?
Adenylyltransferase activity is crucial for numerous cellular processes, including NAD+ biosynthesis, protein AMPylation, and bacterial pathogenesis. Dysregulation of these enzymes can lead to metabolic imbalances, neurodegeneration, and cancer. For example, SARM1 is a metabolic sensor that triggers axon degeneration through its adenylyltransferase activity. Fhit proteins exhibit adenylylsulfate-ammonia adenylyltransferase activity and are tumor suppressors. Bacterial AMPylases modify host proteins to promote infection. Understanding these enzymes provides insights into fundamental biology and offers potential therapeutic targets.
• Regulates NAD+ homeostasis and energy metabolism.
• Controls axon degeneration and neuroprotection.
• Modulates innate immune signaling through ADP-heptose sensing.
• Involved in tumor suppression by Fhit proteins.
• Essential for bacterial virulence and host cell manipulation.
• Plays a role in RNA replication of alphaviruses.
• Contributes to persistence of bacterial infections.
• Target for drug development in cancer and neurodegeneration.
• Provides a mechanism for post-translational regulation of protein function.
• Links metabolic state to cellular stress responses.
Molecular Mechanism of adenylyltransferase activity
Substrate recognition and binding
In simple terms: The enzyme first grabs the adenylyl group donor and the target molecule.
Adenylyltransferases bind ATP or NAD+ as the adenylyl donor and a specific acceptor molecule. For example, NMNATs bind nicotinamide mononucleotide (NMN) and ATP to form NAD+. Fhit proteins bind adenylylsulfate and ammonia to catalyze adenylyl transfer. Bacterial AMPylases recognize host proteins such as Rho GTPases.
Catalytic transfer of the adenylyl group
In simple terms: The enzyme then moves the AMP group onto the target.
The catalytic mechanism involves the cleavage of the phosphoanhydride bond in ATP or NAD+ and the formation of a new bond between AMP and the acceptor. This often requires divalent metal ions such as Mg2+ for stabilization. In SARM1, the transfer of AMP to itself or other proteins is triggered by an increased NMN/NAD+ ratio.
Regulation by metabolic sensors
In simple terms: The enzyme's activity can be turned on or off by changes in cellular energy.
SARM1 is activated by an increased NMN/NAD+ ratio, linking adenylyltransferase activity to metabolic stress. This sensor function is critical for axon degeneration. Other adenylyltransferases may be regulated by substrate availability or post-translational modifications.
Physiological consequences of adenylyl transfer
In simple terms: The modification changes the target's behavior, leading to various cellular outcomes.
Adenylyl transfer can alter protein function, localization, or stability. In bacteria, AMPylation of host proteins disrupts signaling and promotes infection. In humans, NMNAT-mediated NAD+ synthesis supports cellular metabolism and survival. Fhit-mediated adenylyl transfer may influence tumor suppression.
Key Genes Involved in GO:0070566 adenylyltransferase activity
The following genes encode enzymes with adenylyltransferase activity or are directly involved in its regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NMNAT1 | NAD+ biosynthesis | Mutations cause retinal degeneration |
| NMNAT2 | NAD+ biosynthesis | Axon protection |
| NMNAT3 | NAD+ biosynthesis | Mitochondrial NAD+ regulation |
| SARM1 | NAD+ hydrolase and adenylyltransferase | Axon degeneration sensor |
| FHIT | Adenylylsulfate-ammonia adenylyltransferase | Tumor suppressor |
| ALPK1 | ADP-heptose sensor | Innate immunity |
| TIFA | ADP-heptose signaling | Innate immunity |
| VopC | Bacterial AMPylase | Virulence factor |
| Rho GTPases | Host targets of AMPylation | Cytoskeleton regulation |
| DRG1 | Programmed axon degeneration | Neurodegeneration |
| NMNA | Nicotinamide mononucleotide adenylyltransferase | Erythrocyte NAD+ synthesis |
| Fhit | Adenylyltransferase | Cancer |
| SARM1 | Metabolic sensor | Neurodegeneration |
| ALPK1 | Kinase | Innate immune receptor |
| TIFA | Adapter protein | NF-kB activation |
| VopC | AMPylase | Bacterial pathogenesis |
| NMNAT | NAD+ synthesis | Metabolism |
How Is adenylyltransferase activity Regulated?
Adenylyltransferase activity is regulated at multiple levels. SARM1 is directly activated by an increased NMN/NAD+ ratio, making it a metabolic sensor. NMNATs are regulated by substrate availability and cellular energy status. Bacterial AMPylases are controlled by virulence gene expression. Additionally, post-translational modifications such as phosphorylation may modulate enzyme activity.
adenylyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SARM1 | Neurodegeneration | Knockout mice, point-mutation |
| FHIT | Cancer | Knockout cell lines, overexpression |
| NMNAT1 | Retinal degeneration | Knock-in mice |
| ALPK1 | Innate immunity | Knockout macrophages |
| VopC | Bacterial infection | Bacterial mutants |
Neurodegeneration
SARM1 adenylyltransferase activity is a key driver of axon degeneration in neurodegenerative diseases. Variants in programmed axon degeneration genes, including SARM1, are associated with human disease. Inhibition of SARM1 is a therapeutic strategy for neuroprotection.
Cancer
Fhit proteins exhibit adenylyltransferase activity and function as tumor suppressors. Loss of Fhit expression is observed in various cancers, and its adenylyltransferase activity may contribute to its tumor-suppressive role.
Infectious disease
Bacterial AMPylases such as VopC modify host Rho GTPases to promote infection. ALPK1 senses bacterial ADP-heptose, triggering innate immune responses. These enzymes are potential targets for anti-virulence therapies.
From adenylyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does SARM1 adenylyltransferase activity drive axon degeneration? | SARM1 knockout and point-mutation mice |
| What is the role of Fhit adenylyltransferase in cancer? | Fhit knockout cell lines and xenografts |
| How does NMNAT1 mutation affect NAD+ levels? | NMNAT1 knock-in mice |
| Does ALPK1 sense ADP-heptose? | ALPK1 knockout macrophages |
| How does VopC AMPylate Rho GTPases? | VopC overexpression in host cells |
| What is the metabolic regulation of SARM1? | SARM1 overexpression and metabolic stress |
How to Study the adenylyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radioactive enzyme assay | Adenylyl transfer activity | In vitro kinetics |
| HPLC | NAD+ synthesis | NMNAT activity |
| X-ray crystallography | Protein structure | Mechanism |
| CRISPR knockout screen | Gene essentiality | Pathway discovery |
| Mass spectrometry | AMPylation sites | Proteomics |
| Western blot | Protein expression | Validation |
| Immunofluorescence | Localization | Cellular imaging |
Enzymatic assays
Adenylyltransferase activity can be measured using radioactive ATP or NAD+ and detecting the transfer of labeled AMP to acceptors. High-performance liquid chromatography (HPLC) can separate and quantify reaction products.
Structural biology
X-ray crystallography and cryo-EM reveal the atomic details of adenylyltransferases, including substrate binding and catalytic mechanisms. These studies inform inhibitor design.
CRISPR screening
Genome-wide CRISPR knockout screens can identify genes required for adenylyltransferase-mediated phenotypes, such as axon degeneration or bacterial infection.
Proteomics
Mass spectrometry-based proteomics can identify AMPylated proteins and map modification sites. This approach reveals the broader signaling networks controlled by adenylyltransferases.
How CRISPR Can Be Used to Study GO:0070566 adenylyltransferase activity
Knockout
CRISPR knockout of adenylyltransferase genes such as SARM1 or FHIT can reveal their roles in axon degeneration and cancer. Knockout cell lines and mice are valuable for loss-of-function studies.
Point Mutation
Point mutations in the catalytic domain of adenylyltransferases can separate enzymatic activity from scaffolding functions. For example, catalytically dead SARM1 mutants clarify the role of its adenylyltransferase activity in degeneration.
Knock-in
Knock-in of disease-associated mutations, such as those in NMNAT1, can model human retinal degeneration. Tagged knock-in (e.g., HA or GFP) enables tracking of enzyme localization and interactions.
Overexpression
Overexpression of bacterial AMPylases like VopC in host cells can mimic infection and reveal substrate specificity. Overexpression of SARM1 can induce axon degeneration in vitro.
How EDITGENE Supports adenylyltransferase activity Research
Researchers studying adenylyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in a specific pathway or disease. EDITGENE provides comprehensive CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for adenylyltransferase activity research.
Frequently Asked Questions About adenylyltransferase activity
What is adenylyltransferase activity?
Adenylyltransferase activity (GO:0070566) is the catalysis of the transfer of an adenylyl group to an acceptor, often using ATP or NAD+ as donor.
What genes are involved in adenylyltransferase activity?
Key genes include NMNAT1-3, SARM1, FHIT, ALPK1, and bacterial VopC.
What diseases are associated with adenylyltransferase activity?
Neurodegeneration, cancer, and infectious diseases are linked to dysregulation of these enzymes.
How is adenylyltransferase activity regulated?
It is regulated by metabolic sensors like NMN/NAD+ ratio, substrate availability, and post-translational modifications.
What is the role of SARM1 adenylyltransferase activity?
SARM1 acts as a metabolic sensor that triggers axon degeneration through its adenylyltransferase activity.
How can I study adenylyltransferase activity?
Enzymatic assays, structural biology, CRISPR screens, and proteomics are common methods.
What is the difference between adenylyltransferase and AMPylase?
AMPylase is a type of adenylyltransferase that transfers AMP to protein acceptors.
Which GO term describes adenylyltransferase activity?
GO:0070566 is the Gene Ontology term for adenylyltransferase activity.
What are the substrates of adenylyltransferases?
Substrates include proteins, small molecules like NMN, and nucleic acids.
How does Fhit adenylyltransferase activity relate to cancer?
Fhit exhibits adenylyltransferase activity and functions as a tumor suppressor, with loss observed in cancers.
Conclusion
Adenylyltransferase activity (GO:0070566) is a versatile enzymatic function critical for NAD+ metabolism, protein AMPylation, and host-pathogen interactions. Its dysregulation contributes to neurodegeneration, cancer, and infectious diseases. Continued research using CRISPR models and biochemical assays will uncover new therapeutic opportunities.
References
- 1. Zhou P et al.. 2018. Alpha-kinase 1 is a cytosolic innate immune receptor for bacterial ADP-heptose.. Nature 561(7721):122-126 PMID: 30111836
- 2. Hopkins EL et al.. 2026. Programmed axon degeneration gene variants in human disease.. Exp Neurol 404:115891 PMID: 42341897
- 3. Figley MD et al.. 2021. SARM1 is a metabolic sensor activated by an increased NMN/NAD(+) ratio to trigger axon degeneration.. Neuron 109(7):1118-1136.e11 PMID: 33657413
- 4. Zhou X et al.. 2021. A Bacterial Toxin Perturbs Intracellular Amino Acid Balance To Induce Persistence.. mBio 12(1) PMID: 33622732
- 5. Wojdyła-Mamoń AM et al.. 2015. Adenylylsulfate-ammonia adenylyltransferase activity is another inherent property of Fhit proteins.. Biosci Rep 35(4) PMID: 26181368
- 6. Sestini S et al.. 1993. Nicotinamide mononucleotide adenylyltransferase activity in human erythrocytes.. Arch Biochem Biophys 302(1):206-11 PMID: 8470897
- 7. Pietilä MK et al.. 2017. Alphavirus polymerase and RNA replication.. Virus Res 234:44-57 PMID: 28104453
- 8. Chen TT et al.. 2026. Structure and mechanism of an actin-dependent bacterial phosphoryl AMPylase.. Nat Chem Biol 22(1):152-162 PMID: 40588486
