GO:0032559 adenyl ribonucleotide binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0032559 (adenyl ribonucleotide binding) is a molecular_function term describing the binding of proteins to adenyl ribonucleotides such as ATP, ADP, AMP, and cyclic AMP.
• Adenyl ribonucleotide binding is central to energy transfer, signal transduction, and enzymatic catalysis, as exemplified by adenyl cyclase and cAMP-dependent processes.
• Key proteins include adenyl cyclases (e.g., ADCY9), histidine triad nucleotide-binding proteins (HINT1), and aminoacyl-tRNA synthetases such as KARS1.
• The term is mechanistically linked to adenylation intermediates in DNA phosphorothioation and CRISPR-Cas immunity.
• Dysregulation of adenyl ribonucleotide binding is implicated in cardiovascular disease, cancer, and neurological disorders.
• CRISPR-based models (knockout, point mutation, knock-in, overexpression) enable causal interrogation of genes encoding adenyl ribonucleotide-binding proteins.
Description
Adenyl ribonucleotide binding (GO:0032559) is a molecular function that describes the selective interaction of a protein with any compound consisting of adenosine esterified with orthophosphate or an oligophosphate at any hydroxyl group on the ribose moiety. This includes adenosine triphosphate (ATP), adenosine diphosphate (ADP), adenosine monophosphate (AMP), and cyclic AMP (cAMP), which are ubiquitous cellular messengers and energy carriers. The term is fundamental to understanding how cells convert chemical energy into mechanical work, regulate metabolic flux, and transmit signals from the environment to the nucleus. Researchers study adenyl ribonucleotide binding because it underlies diverse biological processes, from hormone-induced cAMP generation by adenyl cyclase to the proofreading and activation steps of aminoacyl-tRNA synthetases. For example, lysyl-tRNA synthetase generates lysyl-adenylate, a substrate for histidine triad nucleotide-binding proteins, linking adenyl ribonucleotide binding to protein synthesis and signaling. In prokaryotes, cAMP binding to the catabolite activator protein controls global gene expression, illustrating the evolutionary conservation of this function. In biomedical research, adenyl ribonucleotide binding is a recurring theme in drug discovery, as many kinases, GTPases, and ATPases are targets of small-molecule inhibitors. The term also intersects with emerging areas such as DNA phosphorothioation and CRISPR-Cas immunity, where adenylated intermediates modulate enzyme activity. Thus, GO:0032559 provides a conceptual framework for annotating and interrogating proteins that sense or utilize adenyl ribonucleotides.
adenyl ribonucleotide binding At A Glance
| GO ID | GO:0032559 |
|---|---|
| GO term | adenyl ribonucleotide binding |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Binding to ATP, ADP, AMP, or cAMP; often coupled to enzymatic catalysis or signal transduction |
| Related GO terms | adenyl nucleotide binding (GO:0030554), ATP binding (GO:0005524), cAMP binding (GO:0030552) |
| Example proteins | Adenyl cyclase (ADCY9), histidine triad nucleotide-binding protein 1 (HINT1), lysyl-tRNA synthetase (KARS1) |
| Disease relevance | Cardiovascular disease, cancer, neurological disorders |
| Research methods | CRISPR knockout, point mutation, knock-in, overexpression, biochemical binding assays |
What Is GO:0032559?
In simple terms, adenyl ribonucleotide binding is the ability of a protein to physically attach to molecules like ATP, ADP, AMP, or cAMP. The official QuickGO definition states: Binding to an adenyl ribonucleotide, any compound consisting of adenosine esterified with (ortho)phosphate or an oligophosphate at any hydroxyl group on the ribose moiety. This function is distinct from adenyl ribonucleotide metabolism or transport; it specifically denotes a binding interaction that may be transient or stable, often coupled to catalysis or conformational change.
Why Is adenyl ribonucleotide binding Important in Cell Biology?
Adenyl ribonucleotide binding is a cornerstone of cellular physiology because it governs energy homeostasis, signal transduction, and biosynthetic pathways. Proteins that bind ATP or cAMP are essential for processes ranging from cardiac contractility to bacterial gene regulation. In disease, mutations that alter adenyl ribonucleotide binding can lead to hyperactive or inactive enzymes, contributing to cancer, heart failure, and metabolic disorders. Therefore, understanding this function at the molecular level is critical for developing targeted therapeutics and for interpreting genomic variants of uncertain significance.
• Energy metabolism: ATP-binding proteins are central to glycolysis, oxidative phosphorylation, and ATP-dependent pumps.
• Signal transduction: cAMP binding to protein kinase A and exchange proteins activates downstream cascades.
• Protein synthesis: Aminoacyl-tRNA synthetases use adenyl ribonucleotide intermediates for tRNA charging.
• DNA modification and immunity: Adenylated intermediates modulate DNA phosphorothioation and CRISPR-Cas immunity.
• Cardiovascular function: Adenylyl cyclase 9 (ADCY9) is targeted in heart failure and arrhythmia research.
• Cancer biology: Altered cAMP signaling and ATP-binding kinases drive proliferation and survival.
• Neurobiology: cAMP binding proteins regulate synaptic plasticity and memory.
• Drug discovery: ATP-binding pockets are highly druggable targets for kinase inhibitors.
• Microbial pathogenesis: cAMP receptor protein controls virulence gene expression in bacteria.
• CRISPR research: Adenyl ribonucleotide-binding domains are engineered into Cas effectors for improved specificity.
Molecular Mechanism of adenyl ribonucleotide binding
Substrate Recognition and Binding Pocket
In simple terms: Proteins have a pocket that fits ATP or cAMP like a lock and key.
Adenyl ribonucleotide-binding proteins typically contain a Rossmann fold or a P-loop motif that coordinates the phosphate groups and the adenine ring. For example, adenyl cyclase binds ATP and converts it to cAMP, a reaction that requires Mg2+ as a cofactor. The binding pocket is highly conserved, as seen in prokaryotic cAMP receptor protein, which undergoes a conformational change upon cAMP binding to regulate transcription.
Catalytic Activation and Conformational Change
In simple terms: Binding of the nucleotide flips a molecular switch that turns the protein on.
In many enzymes, adenyl ribonucleotide binding induces a conformational change that aligns catalytic residues. Lysyl-tRNA synthetase generates lysyl-adenylate, an activated intermediate that is then transferred to tRNA; this step is essential for translation fidelity. Similarly, histidine triad nucleotide-binding proteins hydrolyze adenylated substrates, and their activity depends on precise binding of the adenyl moiety.
Regulation by Nucleotide Exchange
In simple terms: The protein can be turned off when the nucleotide leaves and on when a new one binds.
Nucleotide exchange factors and hydrolysis regulate the duration of adenyl ribonucleotide binding. For instance, alpha-adrenergic stimulation modulates adenyl cyclase activity through G-protein-coupled mechanisms, altering cAMP levels. In heart tissue, type 9 adenylyl cyclase is targeted to nanometric domains, where local ATP binding and cAMP production are tightly controlled.
Adenylated Intermediates in DNA Modification and Immunity
In simple terms: Some proteins attach AMP to DNA or other molecules as a tag.
A DNA phosphorothioation pathway uses an adenylated intermediate to modulate Tdp machinery, demonstrating a non-canonical role for adenyl ribonucleotide binding. In type III-A CRISPR-Cas immunity, CARF-HAD phosphatase effectors provide immunity through adenyl ribonucleotide-dependent signaling. These examples highlight the versatility of adenyl ribonucleotide binding beyond classical metabolism.
Key Genes Involved in GO:0032559 adenyl ribonucleotide binding
The following genes encode proteins that directly bind adenyl ribonucleotides and are widely studied in biomedical research.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ADCY1 | Adenyl cyclase 1; converts ATP to cAMP in neurons | Learning and memory; neurological disorders |
| ADCY9 | Adenyl cyclase 9; cardiac cAMP production | Heart failure; arrhythmia |
| HINT1 | Histidine triad nucleotide-binding protein 1; hydrolyzes adenylated substrates | Cancer; neuropathy |
| KARS1 | Lysyl-tRNA synthetase; generates lysyl-adenylate | Translation; Charcot-Marie-Tooth disease |
| PRKACA | cAMP-dependent protein kinase catalytic subunit | Cushing syndrome; cancer |
| CRP | cAMP receptor protein in bacteria | Gene regulation; virulence |
| Tdp1 | Tyrosyl-DNA phosphodiesterase 1; adenylated intermediate in DNA repair | Cancer; neurodegeneration |
| Cas10 | CRISPR-Cas10; adenyl ribonucleotide-binding effector | Immunity; genome editing |
| GNAS | G protein alpha subunit; regulates adenyl cyclase | McCune-Albright syndrome; cancer |
| ADRB1 | Beta-1 adrenergic receptor; modulates cAMP | Heart failure; hypertension |
| ADRB2 | Beta-2 adrenergic receptor; modulates cAMP | Asthma; cardiovascular disease |
| SHBG | Sex hormone-binding globulin; binds ATP and steroids | Endocrine regulation |
| AKAP9 | A-kinase anchoring protein 9; scaffolds cAMP signaling | Cardiac arrhythmia |
| PDE4D | Phosphodiesterase 4D; hydrolyzes cAMP | Depression; COPD |
| EPAC1 | Exchange protein activated by cAMP | Diabetes; cancer |
| PKG1 | cGMP-dependent protein kinase; cross-talks with cAMP | Cardiovascular disease |
How Is adenyl ribonucleotide binding Regulated?
Adenyl ribonucleotide binding is regulated at multiple levels. Intracellular nucleotide concentrations, such as ATP/ADP ratios, influence binding occupancy. Post-translational modifications, including phosphorylation, can alter the affinity of proteins for adenyl ribonucleotides. In heart, nanometric targeting of type 9 adenylyl cyclase by A-kinase anchoring proteins creates local cAMP microdomains that regulate contractility. Additionally, phosphodiesterases hydrolyze cAMP, terminating binding and downstream signaling. In prokaryotes, cAMP levels are controlled by adenyl cyclase and phosphodiesterase activities, which in turn regulate catabolite repression.
adenyl ribonucleotide binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ADCY9 | Heart failure; arrhythmia | Cardiomyocyte-specific knockout mouse |
| GNAS | McCune-Albright syndrome; endocrine tumors | Knock-in mouse with activating mutation |
| KARS1 | Charcot-Marie-Tooth disease | Patient-derived iPSC neurons with point mutation |
| HINT1 | Cancer; neuropathy | HINT1 knockout cell line and xenograft |
| CRP | Bacterial virulence | CRP knockout in E. coli; infection model |
Cardiovascular Disease
Adenyl ribonucleotide binding is critical for cardiac function. Type 9 adenylyl cyclase (ADCY9) is targeted to nanometric domains in cardiomyocytes, where it regulates cAMP-dependent signaling. Dysregulation of this pathway contributes to heart failure and arrhythmias. Beta-adrenergic receptors (ADRB1, ADRB2) modulate adenyl cyclase activity, and their chronic stimulation is a hallmark of heart failure. Targeting adenyl ribonucleotide-binding proteins with small molecules is a therapeutic strategy in cardiovascular medicine.
Cancer
Many oncogenic kinases bind ATP and are targets of approved inhibitors. cAMP signaling, mediated by adenyl ribonucleotide binding to protein kinase A and EPAC, influences cell proliferation, migration, and apoptosis. Mutations in GNAS, which encodes the Gs alpha subunit, lead to constitutive adenyl cyclase activation and are found in endocrine tumors. Histidine triad nucleotide-binding protein 1 (HINT1) acts as a tumor suppressor, and its loss is associated with cancer progression.
Neurological Disorders
Adenyl cyclase 1 (ADCY1) is highly expressed in neurons and is required for synaptic plasticity and memory formation. Disruption of cAMP signaling has been implicated in depression, schizophrenia, and addiction. Mutations in KARS1, which generates lysyl-adenylate, cause Charcot-Marie-Tooth disease, a peripheral neuropathy. These examples underscore the importance of adenyl ribonucleotide binding in neuronal health.
Infectious Disease and Immunity
Prokaryotic cAMP receptor protein (CRP) binds cAMP to control virulence gene expression in pathogens such as Escherichia coli and Vibrio cholerae. In CRISPR-Cas systems, adenyl ribonucleotide-binding domains in Cas10 and CARF-HAD effectors are essential for immunity against phages. DNA phosphorothioation pathways use adenylated intermediates to modulate Tdp machinery, affecting bacterial defense and genome stability.
From adenyl ribonucleotide binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of ADCY9 affect cardiac contractility? | ADCY9 knockout mouse or cardiomyocyte-specific KO |
| Does a point mutation in KARS1 alter tRNA charging? | KARS1 point-mutation knock-in cell line |
| Can a tagged HINT1 reveal its interactome? | HINT1 knock-in with FLAG tag |
| Does overexpression of CRP increase virulence? | CRP overexpression in bacteria |
| Is Cas10 adenyl ribonucleotide binding required for immunity? | Cas10 point-mutation knockout in CRISPR locus |
| Does cAMP binding to EPAC1 promote cancer cell migration? | EPAC1 overexpression and knockout in cancer cells |
How to Study the adenyl ribonucleotide binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Filter binding assay | Direct binding affinity (Kd) | Validate ATP binding to purified proteins |
| Fluorescence polarization | Binding kinetics and competition | Screen small-molecule inhibitors |
| X-ray crystallography | Atomic structure of binding pocket | Structure-guided drug design |
| Cryo-EM | Conformational changes upon binding | Large complexes like Cas10 |
| CRISPR knockout screen | Genes required for cAMP signaling | Identify novel regulators |
| FRET biosensor imaging | Real-time cAMP dynamics | Cardiomyocyte signaling |
| Isothermal titration calorimetry | Thermodynamics of binding | Characterize mutant proteins |
| Photoaffinity labeling | Identification of nucleotide-binding proteins | Proteome-wide profiling |
Biochemical Binding Assays
Radioactive or fluorescently labeled adenyl ribonucleotides (e.g., 32P-ATP, fluorescent cAMP analogs) are used in filter-binding or fluorescence polarization assays to measure dissociation constants (Kd) and binding kinetics. These methods are foundational for validating adenyl ribonucleotide binding in vitro.
Structural Biology
X-ray crystallography and cryo-electron microscopy reveal the atomic details of adenyl ribonucleotide binding pockets, including coordination of Mg2+ and conformational changes. Structures of adenyl cyclase and Cas10 have provided insights into catalysis and immunity.
CRISPR-Based Genetic Screens
Genome-wide CRISPR knockout or activation screens can identify genes required for adenyl ribonucleotide-dependent processes, such as cAMP signaling or DNA phosphorothioation. These screens link genotype to phenotype at scale.
Live-Cell Imaging of cAMP
Genetically encoded FRET sensors (e.g., EPAC-based probes) allow real-time visualization of cAMP dynamics in living cells, revealing spatial and temporal aspects of adenyl ribonucleotide binding.
How CRISPR Can Be Used to Study GO:0032559 adenyl ribonucleotide binding
Knockout
CRISPR knockout of genes encoding adenyl ribonucleotide-binding proteins (e.g., ADCY9, HINT1) enables loss-of-function studies to determine their role in cellular processes and disease models. Knockout cell lines are valuable for drug sensitivity screens and pathway analysis.
Point Mutation
Introducing specific point mutations in the nucleotide-binding pocket (e.g., KARS1 or Cas10) via CRISPR base editing or homology-directed repair allows precise interrogation of binding residues and catalytic mechanisms. Such models can reveal whether a mutation is pathogenic or benign.
Knock-in
Knock-in of epitope tags (e.g., FLAG, HA) or fluorescent proteins at endogenous loci facilitates proteomic and imaging studies of adenyl ribonucleotide-binding proteins under native regulation. Knock-in of disease-associated mutations creates isogenic models for drug testing.
Overexpression
CRISPR activation (CRISPRa) or cDNA overexpression can elevate levels of adenyl ribonucleotide-binding proteins to study gain-of-function effects, such as enhanced cAMP signaling or oncogenic transformation. Overexpression models are useful for identifying downstream targets and resistance mechanisms.
How EDITGENE Supports adenyl ribonucleotide binding Research
Researchers studying adenyl ribonucleotide binding-related genes often need to determine whether a candidate gene is causally involved in a specific biological process or disease. EDITGENE provides end-to-end CRISPR services to generate precisely engineered cell models, enabling rigorous functional validation.
Contact EDITGENE today to design your custom CRISPR model for adenyl ribonucleotide binding research.
Frequently Asked Questions About adenyl ribonucleotide binding
What is adenyl ribonucleotide binding?
Adenyl ribonucleotide binding (GO:0032559) is a molecular function where a protein binds to molecules like ATP, ADP, AMP, or cAMP, often to catalyze reactions or transmit signals.
What genes are involved in adenyl ribonucleotide binding?
Key genes include ADCY1, ADCY9, HINT1, KARS1, PRKACA, CRP, and GNAS, among others.
How is adenyl ribonucleotide binding studied?
Common methods include biochemical binding assays, X-ray crystallography, CRISPR screens, and FRET biosensors.
What diseases are linked to adenyl ribonucleotide binding?
Cardiovascular disease, cancer, neurological disorders, and infectious diseases are associated with dysregulated adenyl ribonucleotide binding.
What is the difference between adenyl ribonucleotide binding and ATP binding?
ATP binding is a subset of adenyl ribonucleotide binding; the latter also includes ADP, AMP, and cAMP.
Can CRISPR be used to study adenyl ribonucleotide binding?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect gene function.
Which proteins bind cAMP?
Proteins such as protein kinase A, EPAC, and CRP bind cAMP to regulate diverse processes.
What is the role of adenyl cyclase in adenyl ribonucleotide binding?
Adenyl cyclase binds ATP and converts it to cAMP, a classic example of adenyl ribonucleotide binding coupled to catalysis.
How does adenyl ribonucleotide binding affect the heart?
In the heart, adenyl cyclase 9 and beta-adrenergic receptors modulate cAMP signaling to control contractility and rhythm.
What are the therapeutic implications of adenyl ribonucleotide binding?
Many drugs target ATP-binding kinases or cAMP pathways, making this function a prime focus for drug discovery.
Conclusion
Adenyl ribonucleotide binding (GO:0032559) is a fundamental molecular function that underpins energy metabolism, signal transduction, and immunity. Its dysregulation contributes to major human diseases, and CRISPR-based models are powerful tools for causal interrogation. EDITGENE offers comprehensive services to accelerate research on adenyl ribonucleotide-binding proteins.
References
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- 3. Botsford JL et al.. 1992. Cyclic AMP in prokaryotes.. Microbiol Rev 56(1):100-22 PMID: 1315922
- 4. An T et al.. 2025. A DNA phosphorothioation pathway via adenylated intermediate modulates Tdp machinery.. Nat Chem Biol 21(8):1160-1170 PMID: 39820821
- 5. Stella G et al.. 2025. CARF-HAD phosphatase effectors provide immunity during the type III-A CRISPR-Cas response.. Nucleic Acids Res 53(22) PMID: 41416522
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- 8. Rosner W et al.. 1991. Sex hormone-binding globulin: anatomy and physiology of a new regulatory system.. J Steroid Biochem Mol Biol 40(4-6):813-20 PMID: 1659894
