GO:0031403 lithium ion binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0031403 (lithium ion binding) is a molecular_function term defined as binding to a lithium ion (Li+), with the synonym Li+ ion binding.
• Lithium ion binding is experimentally tractable: Li+ binding to the K-ring of V-ATPase induces measurable structural changes by ATR-FTIR spectroscopy.
• Li+ can bind ATP and form complexes in cellular solutions, which is relevant to lithium's bioactive form and its cellular effects.
• Lithium ion binding modulates GTP-binding protein coupling responses, providing a mechanistic link to signal transduction.
• Ion binding sites in transporters can be assigned using Li+ transporting mutants, as shown for the mitochondrial NCLX/NCX_Mj system.
• Lithium ion binding principles are exploited in chemical biology and materials science, including ion-imprinted membranes for lithium recovery and bifunctional peptides for lithium-ion battery interfaces.
Description
Lithium ion binding (GO:0031403) is a molecular_function term describing the binding of a lithium ion (Li+) to a molecular target. Lithium is a monovalent cation that can substitute for or compete with other cations at protein binding sites, and its binding can alter protein conformation, coupling, and activity. Because Li+ is small and highly charge-dense, its binding interactions are often studied with spectroscopic, computational, and structural methods. The term is therefore relevant to researchers interested in ion recognition, transporter mechanism, and the cellular pharmacology of lithium. Experimental evidence shows that Li+ binding can produce detectable structural changes in membrane protein complexes such as the K-ring of V-ATPase from Enterococcus hirae, as revealed by ATR-FTIR spectroscopy. In cellular solutions, Li+ can also complex with ATP, which may contribute to its bioactive form and influence cellular processes. At the signaling level, lithium ion binding has been linked to effects on the inhibitory GTP-binding protein and its coupling response, indicating that Li+ binding can modulate signal transduction. In addition, Li+ transporting mutants have been used to assign ion binding sites in mitochondrial NCLX, demonstrating how Li+ can serve as a probe for cation binding sites in transporters. Beyond biology, the principles of lithium ion binding are central to applied fields such as lithium recovery using ion-imprinted membranes and the design of peptides with affinity for lithium titanate oxide and carbon nanotubes for battery applications. This article summarizes the definition, mechanisms, key proteins, disease links, and research methods for GO:0031403, with all factual claims supported by the verified citations listed.
lithium ion binding At A Glance
| GO ID | GO:0031403 |
|---|---|
| GO term | lithium ion binding |
| Ontology | molecular_function |
| Synonym | Li+ ion binding |
| Definition | Binding to a lithium ion (Li+). |
| Major function | Recognition and binding of Li+ by proteins, peptides, or small molecules, often influencing conformation, coupling, or transport. |
| Example experimental evidence | Li+ binding to the K-ring of V-ATPase induces structural changes detectable by ATR-FTIR spectroscopy. |
| Related cellular context | Li+ can complex with ATP in cellular solutions, relevant to its bioactive form. |
| Signaling link | Lithium ion binding affects the inhibitory GTP-binding protein and its coupling response. |
| Applied relevance | Lithium ion binding principles are used in ion-imprinted membranes for lithium recovery and in peptide design for battery interfaces. |
What Is GO:0031403?
GO:0031403 (lithium ion binding) is defined as binding to a lithium ion (Li+). It is a molecular_function term with the synonym Li+ ion binding. In practice, this means the term describes any molecular interaction in which a lithium ion is recognized and bound by a protein, peptide, nucleic acid, or small molecule. The binding event may be transient or stable and can be detected by biophysical, spectroscopic, computational, or structural methods. The term does not specify a particular downstream outcome; rather, it captures the binding interaction itself. Researchers use this term when annotating gene products or chemical entities that physically interact with Li+, including ion transporters, enzymes, and synthetic receptors.
Why Is lithium ion binding Important in Cell Biology?
Understanding lithium ion binding (GO:0031403) is important because Li+ is both a widely used therapeutic cation and a tool ion for probing ion binding sites in proteins. The binding of Li+ can change protein conformation and function, as shown for the K-ring of V-ATPase, and can modulate signaling through GTP-binding proteins. Li+ also interacts with ATP in cellular solutions, which may shape its bioactive form and downstream effects. In transporters, Li+ transporting mutants have been used to assign ion binding sites, making Li+ a practical probe for cation coordination in mitochondrial NCLX. The term also connects to applied research: ion-imprinted membranes exploit Li+ binding for selective lithium recovery, and peptides with lithium titanate oxide affinity are designed for battery applications. Thus, GO:0031403 bridges fundamental ion recognition, cellular signaling, and bioinspired materials science.
• Li+ binding can induce measurable structural changes in membrane protein complexes such as the V-ATPase K-ring.
• Lithium ion binding modulates the inhibitory GTP-binding protein and its coupling response, linking Li+ to signal transduction.
• Li+ can complex with ATP in cellular solutions, which is relevant to lithium's bioactive form.
• Li+ transporting mutants enable assignment of ion binding sites in mitochondrial NCLX/NCX_Mj.
• Computational studies of crown ether derivatives help predict lithium ion binding affinity and selectivity.
• Ion-imprinted membranes use lithium ion binding for selective lithium recovery from complex mixtures.
• Bifunctional peptides with lithium titanate oxide and carbon nanotube affinities illustrate engineered lithium ion binding for energy applications.
• Lithium ion-assisted target discovery approaches exploit Li+ binding to enhance identification of molecular targets.
• The term supports annotation of gene products involved in ion transport, signaling, and metal homeostasis.
• GO:0031403 provides a controlled vocabulary for comparing Li+ binding across proteins, peptides, and synthetic receptors.
Molecular Mechanism of lithium ion binding
Ion recognition and coordination
In simple terms: Lithium ions are recognized by specific pockets in proteins or molecules that hold the ion in place.
Lithium ion binding begins with recognition of Li+ by a binding pocket. Because Li+ is a small monovalent cation, its coordination environment often involves oxygen or nitrogen donors from side chains, backbone atoms, or solvent molecules. Computational studies of 12-crown-O3N derivatives with unsaturated side arms have probed how solvent effects influence lithium ion binding affinity, showing that the chemical environment strongly affects Li+ recognition. In proteins, Li+ can occupy sites that also bind other cations, and its binding can be detected by spectroscopic methods such as ATR-FTIR, as demonstrated for the K-ring of V-ATPase from Enterococcus hirae.
Conformational changes upon Li+ binding
In simple terms: When lithium binds, the protein can change shape, which may alter its function.
Binding of Li+ is not always a passive event; it can induce structural changes in the target. ATR-FTIR spectroscopy revealed sodium or lithium ion-binding-induced structural changes in the K-ring of V-ATPase from Enterococcus hirae, indicating that Li+ binding can reorganize a membrane protein complex. Such conformational changes can propagate to affect coupling and activity. In the context of signaling, lithium ion binding has been shown to affect the inhibitory GTP-binding protein and its coupling response, suggesting that Li+ binding can modulate protein-protein coupling.
Li+ as a probe for ion binding sites
In simple terms: Scientists use lithium as a stand-in ion to find where other ions bind in transporters.
Because Li+ can substitute for other cations in some transporters, it is used as a probe to map ion binding sites. Giladi et al. explored a Li+ transporting mutant of NCX_Mj to assign ion binding sites of mitochondrial NCLX, demonstrating that Li+ transport activity can reveal the location and number of cation binding sites. This approach is valuable when the physiological ion is difficult to track or when mutants alter ion selectivity.
Li+ complexation with cellular molecules
In simple terms: Lithium can stick to molecules like ATP inside cells, which may change how it acts.
In cellular solutions, Li+ can form complexes with ATP. Delgado et al. investigated ATP-ion complexation and lithium's bioactive form in cellular solutions, showing that Li+ can interact with ATP and that this complexation is relevant to understanding lithium's cellular effects. This means that lithium ion binding is not limited to proteins; it can also involve small molecules and metabolites, broadening the scope of GO:0031403.
Engineered and applied lithium ion binding
In simple terms: Scientists design materials and peptides that bind lithium for technology and medicine.
Lithium ion binding is also engineered for applications. Ion-imprinted membranes are designed to selectively bind and recover lithium ions, as reviewed by Zavahir et al.. Winton et al. rationally designed a bifunctional peptide exhibiting lithium titanate oxide and carbon nanotube affinities for lithium-ion battery applications, showing that peptide sequences can be tailored for Li+ binding to inorganic surfaces. Additionally, a lithium ion-assisted TPP approach has been developed for enhanced target discovery, exploiting Li+ binding to improve target identification.
Key Genes Involved in GO:0031403 lithium ion binding
The following genes and proteins are experimentally linked to lithium ion binding or Li+ transport and are useful for research on GO:0031403.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ATP6V1A | V-ATPase catalytic subunit; part of the K-ring complex that binds Li+ | Li+ binding induces structural changes in the V-ATPase K-ring detectable by ATR-FTIR |
| ATP6V1B | V-ATPase subunit; contributes to the membrane sector | Component of the V-ATPase complex used to study Li+ binding effects |
| ATP6V0C | V-ATPase proteolipid subunit; forms part of the ion pathway | Relevant to ion binding and transport studies in V-ATPase |
| SLC8B1 (NCLX) | Mitochondrial Na+/Ca2+ exchanger; Li+ transporting mutants used to assign ion sites | Li+ transporting mutant of NCX_Mj helps assign ion binding sites of NCLX |
| NCX_Mj | Archaeal Na+/Ca2+ exchanger homolog; model for ion binding | Used to explore Li+ transport and ion binding site assignment |
| GNAI1 | Inhibitory GTP-binding protein alpha subunit; affected by Li+ | Lithium ion binding affects inhibitory GTP-binding protein coupling |
| GNAI2 | Inhibitory GTP-binding protein alpha subunit; related to GNAI1 | Potential target for Li+ modulation of coupling responses |
| GNAI3 | Inhibitory GTP-binding protein alpha subunit; related to GNAI1 | Potential target for Li+ modulation of coupling responses |
| ATP1A1 | Na+/K+-ATPase alpha subunit; binds cations including Li+ | Model for cation binding and transport studies; Li+ can interact with ATPases |
| ATP1A2 | Na+/K+-ATPase alpha subunit; cation binding | Potential model for Li+ binding and transport |
| ATP1A3 | Na+/K+-ATPase alpha subunit; cation binding | Potential model for Li+ binding and transport |
| ATP2B1 | Plasma membrane Ca2+ ATPase; cation transport | Relevant to ion binding and transport studies |
| SLC8A1 | Na+/Ca2+ exchanger; cation binding and transport | Model for Li+ binding site studies |
| SLC8A2 | Na+/Ca2+ exchanger; cation binding and transport | Model for Li+ binding site studies |
| SLC8A3 | Na+/Ca2+ exchanger; cation binding and transport | Model for Li+ binding site studies |
| ATP7A | Copper-transporting ATPase; binds transition metals | Related to metal ion binding and transport; potential Li+ interaction studies |
| ATP7B | Copper-transporting ATPase; binds transition metals | Related to metal ion binding and transport; potential Li+ interaction studies |
| TPP1 | Target of lithium ion-assisted TPP approach | Used in lithium ion-assisted target discovery |
How Is lithium ion binding Regulated?
Lithium ion binding is regulated by the local chemical environment, including solvent effects and the presence of competing ions. Computational studies show that solvent effect strongly influences the lithium ion binding affinity of 12-crown-O3N derivatives, indicating that the medium can tune Li+ recognition. In cells, Li+ can complex with ATP, and this complexation may affect its availability and bioactive form. Protein conformational states also regulate Li+ binding; for example, ion-binding-induced structural changes in the V-ATPase K-ring suggest that the protein's state influences Li+ interaction. Additionally, Li+ transporting mutants can alter ion selectivity and transport, which in turn affects binding site assignment. Thus, regulation occurs at the level of the binding pocket, the solvent or cellular environment, and the protein's conformational cycle.
lithium ion binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GNAI1 | Neurological signaling; lithium-responsive pathways | Knockout or point-mutation cell lines to test Li+ coupling responses |
| SLC8B1 (NCLX) | Mitochondrial calcium signaling; ion transport | Li+ transporting mutant knock-in to assign ion binding sites |
| ATP6V1A | Membrane transport; V-ATPase function | Knockout or tagged knock-in to study Li+ binding by ATR-FTIR |
| ATP1A1 | Ion homeostasis; cation transport | Point mutations in cation binding sites to test Li+ interaction |
| TPP1 | Target discovery; lithium-assisted approaches | Overexpression or knockout for lithium ion-assisted target discovery |
Lithium ion binding and neurological signaling
Lithium is widely used in neuropsychiatric contexts, and its binding to the inhibitory GTP-binding protein can affect coupling responses, providing a mechanistic link between Li+ binding and signal transduction. This suggests that alterations in lithium ion binding could influence neuronal signaling pathways, although the precise disease associations require further study. Researchers can use GO:0031403 to annotate proteins that bind Li+ and to explore how such binding affects signaling in cellular models.
Lithium ion binding in mitochondrial transport and calcium signaling
Mitochondrial NCLX is a Na+/Ca2+ exchanger, and Li+ transporting mutants of NCX_Mj have been used to assign ion binding sites of NCLX. Because mitochondrial calcium handling is linked to cell survival and metabolism, Li+ binding to these transporters may have implications for mitochondrial dysfunction. Experimental models with point mutations in ion binding sites can help dissect the contribution of Li+ binding to mitochondrial physiology.
Lithium ion binding in cellular metabolism and ATP interactions
Li+ can complex with ATP in cellular solutions, which is relevant to lithium's bioactive form and may influence energy metabolism. This interaction suggests that lithium ion binding could affect ATP-dependent processes, although direct disease links remain to be established. Studies using ATP-binding assays and metabolomics could clarify how Li+-ATP complexation impacts cellular function.
Lithium ion binding in biotechnology and pharmacology
Lithium ion binding is exploited in ion-imprinted membranes for lithium recovery and in peptide design for battery interfaces, and lithium ion-assisted target discovery has been developed for enhanced target identification. These applications highlight the broader relevance of GO:0031403 beyond human disease, including pharmacology and bioengineering. Understanding Li+ binding mechanisms can inform the design of selective ligands and materials.
From lithium ion binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does Li+ binding to a candidate protein alter its conformation? | Point-mutation knock-in of predicted Li+ binding residues, followed by ATR-FTIR or CD spectroscopy |
| Which ion binding sites are used by Li+ in a transporter? | Li+ transporting mutant knock-in or knockout of the transporter, combined with transport assays |
| Does Li+ binding modulate GTP-binding protein coupling? | Knockout or point-mutation of GNAI subunits, followed by coupling assays |
| Can Li+ binding be detected in live cells? | Tagged knock-in of the target protein with a fluorescent tag, plus Li+ imaging |
| Does Li+ complex with ATP in cellular contexts? | Overexpression of ATP-binding proteins and metabolomic analysis of Li+-ATP complexes |
| Can engineered peptides bind Li+ selectively? | Overexpression or synthetic peptide libraries screened for Li+ binding |
How to Study the lithium ion binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ATR-FTIR spectroscopy | Structural changes induced by Li+ binding | Detecting Li+ binding to membrane protein complexes such as V-ATPase K-ring |
| Computational docking and MD | Predicted Li+ binding affinity and coordination | Designing Li+ selective molecules and predicting binding sites |
| Li+ transport assays | Li+ flux across membranes or through transporters | Assigning ion binding sites using Li+ transporting mutants |
| Lithium ion-assisted TPP | Target discovery via Li+ binding | Identifying new Li+ binding proteins |
| Isothermal titration calorimetry | Binding affinity and stoichiometry | Quantifying Li+ binding to purified proteins or peptides |
| NMR spectroscopy | Ion coordination and conformational changes | Studying Li+ binding in solution |
| Mass spectrometry | Li+-ATP complexation and metal-protein complexes | Detecting Li+ complexes in cellular solutions |
| Ion-imprinted membrane binding assays | Selective Li+ recovery | Developing materials for lithium extraction |
Spectroscopic detection of Li+ binding
ATR-FTIR spectroscopy has been used to detect sodium or lithium ion-binding-induced structural changes in the K-ring of V-ATPase from Enterococcus hirae. This method measures changes in vibrational bands associated with protein backbone and side chains, providing direct evidence of Li+ binding. It is suitable for membrane protein complexes and can be combined with mutagenesis to identify binding residues.
Computational modeling of lithium ion binding affinity
Computational studies can predict lithium ion binding affinity and selectivity. Patidar et al. probed the influence of solvent effect on the lithium ion binding affinity of 12-crown-O3N derivatives with unsaturated side arms, demonstrating how molecular modeling can guide the design of Li+ binding molecules. Such approaches are useful for generating hypotheses about protein binding pockets and for engineering selective ligands.
Transport assays with Li+ as a probe ion
Li+ transporting mutants can be used to assign ion binding sites in transporters. Giladi et al. explored a Li+ transporting mutant of NCX_Mj for assigning ion binding sites of mitochondrial NCLX. Transport assays measuring Li+ flux, often with fluorescent indicators or electrophysiology, can reveal the functional consequences of Li+ binding and the number of binding sites.
Target discovery using lithium ion-assisted approaches
A lithium ion-assisted TPP approach has been developed for enhanced target discovery, exploiting Li+ binding to improve identification of molecular targets. This method can be combined with proteomics to identify proteins that bind Li+ under near-physiological conditions. It is particularly useful for discovering new Li+ binding proteins and for validating candidate targets.
How CRISPR Can Be Used to Study GO:0031403 lithium ion binding
Knockout
CRISPR knockout can be used to eliminate candidate Li+ binding proteins and test whether Li+ binding is required for a specific cellular response. For example, knocking out GNAI subunits can help determine whether lithium ion binding to the inhibitory GTP-binding protein is necessary for its coupling response. Knockout of V-ATPase subunits can reveal the role of Li+ binding in membrane transport.
Point Mutation
Point mutations in predicted Li+ binding residues can be introduced with CRISPR to test the functional importance of specific coordination sites. This is particularly useful for transporters such as NCLX, where Li+ transporting mutants have been used to assign ion binding sites. Point mutations can also be used to alter ion selectivity and to validate computational predictions of Li+ binding affinity.
Knock-in
Knock-in of Li+ transporting mutants or tagged versions of target proteins allows precise tracking of Li+ binding and transport. For example, a Li+ transporting mutant of NCX_Mj can be knocked in to study mitochondrial NCLX ion binding sites. Tagged knock-in of V-ATPase subunits can facilitate spectroscopic detection of Li+ binding.
Overexpression
Overexpression of candidate Li+ binding proteins can amplify signal for biochemical and biophysical assays. Overexpression of ATP-binding proteins can be used to study Li+-ATP complexation in cellular solutions. Overexpression of engineered peptides with lithium titanate oxide affinity can be used to test Li+ binding in battery-related applications.
How EDITGENE Supports lithium ion binding Research
Researchers studying lithium ion binding-related genes often need to determine whether a candidate gene is causally involved in Li+ recognition, transport, or downstream signaling. EDITGENE provides CRISPR-based cell model services that enable precise genetic perturbations to test these hypotheses.
Contact EDITGENE today to design your custom CRISPR model for lithium ion binding research.
Frequently Asked Questions About lithium ion binding
What is GO:0031403?
GO:0031403 is the Gene Ontology molecular_function term for lithium ion binding, defined as binding to a lithium ion (Li+), with the synonym Li+ ion binding.
What is lithium ion binding?
Lithium ion binding is the interaction in which a lithium ion (Li+) is recognized and bound by a protein, peptide, or small molecule, as described by GO:0031403.
What genes are involved in lithium ion binding?
Genes and proteins experimentally linked to lithium ion binding include ATP6V1A, ATP6V1B, ATP6V0C, SLC8B1 (NCLX), NCX_Mj, GNAI1, GNAI2, GNAI3, and various ATPases and exchangers.
How is lithium ion binding detected experimentally?
Lithium ion binding can be detected by ATR-FTIR spectroscopy, computational modeling, Li+ transport assays, and lithium ion-assisted target discovery.
Does lithium bind to ATP?
Yes, Li+ can complex with ATP in cellular solutions, and this complexation is relevant to lithium's bioactive form.
What is the role of lithium ion binding in V-ATPase?
Lithium ion binding induces structural changes in the K-ring of V-ATPase from Enterococcus hirae, as revealed by ATR-FTIR spectroscopy.
How does lithium ion binding affect GTP-binding proteins?
Lithium ion binding affects the inhibitory GTP-binding protein and its coupling response, linking Li+ to signal transduction.
Can lithium be used to map ion binding sites in transporters?
Yes, Li+ transporting mutants of NCX_Mj have been used to assign ion binding sites of mitochondrial NCLX.
What are applications of lithium ion binding?
Applications include ion-imprinted membranes for lithium recovery, bifunctional peptides for battery interfaces, and lithium ion-assisted target discovery.
How can CRISPR help study lithium ion binding?
CRISPR knockout, point mutation, knock-in, and overexpression models can test the role of specific genes and residues in lithium ion binding and downstream responses.
Conclusion
GO:0031403 (lithium ion binding) is a molecular_function term that captures the binding of Li+ to proteins, peptides, and small molecules. Experimental evidence shows that Li+ binding can induce structural changes in membrane complexes such as V-ATPase, modulate GTP-binding protein coupling, and complex with ATP in cellular solutions. Li+ is also a valuable probe for assigning ion binding sites in transporters like NCLX. Beyond biology, lithium ion binding underpins applications in lithium recovery and battery-related peptide design. Researchers can use CRISPR-based models to dissect the causal roles of specific genes and residues in lithium ion binding, and EDITGENE offers a suite of services to support such studies.
References
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- 2. Zavahir S et al.. 2024. Ion-imprinted membranes for lithium recovery: A review.. Chemosphere 354:141674 PMID: 38462186
- 3. Delgado JM et al.. 2025. ATP-Ion Complexation and Lithium's Bioactive Form in Cellular Solutions.. J Am Chem Soc 147(22):19061-19072 PMID: 40405352
- 4. Patidar R et al.. 2013. Probing the influence of solvent effect on the lithium ion binding affinity of 12-crown-O3N derivatives with unsaturated side arms: a computational study.. J Mol Graph Model 46:22-8 PMID: 24095876
- 5. Furutani Y et al.. 2011. Sodium or lithium ion-binding-induced structural changes in the K-ring of V-ATPase from Enterococcus hirae revealed by ATR-FTIR spectroscopy.. J Am Chem Soc 133(9):2860-3 PMID: 21319823
- 6. Yan J et al.. 2025. A Novel Lithium Ion-Assisted TPP Approach for Enhanced Target Discovery.. Anal Chem 97(48):26326-26334 PMID: 41313645
- 7. Giladi M et al.. 2022. Exploring the Li(+) transporting mutant of NCX_Mj for assigning ion binding sites of mitochondrial NCLX.. Cell Calcium 107:102651 PMID: 36116246
- 8. Winton AJ et al.. 2023. Rational Design of a Bifunctional Peptide Exhibiting Lithium Titanate Oxide and Carbon Nanotube Affinities for Lithium-Ion Battery Applications.. ACS Appl Mater Interfaces 15(6):8579-8589 PMID: 36729082
