GO:0140031 phosphorylation-dependent protein binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140031 phosphorylation-dependent protein binding describes the molecular function of binding to a protein only after that target protein has been phosphorylated.
• This binding event is central to signal transduction, allowing phosphorylation marks to be read as docking sites for downstream effectors.
• Key proteins involved include 4E-BP2, p53, YAP, SARS-CoV-2 nucleocapsid, and plant G-proteins, each regulated by phosphorylation-dependent interactions.
• Phosphorylation-dependent binding controls diverse processes such as mRNA deadenylation, DNA binding, protein stability, and nodule formation.
• Dysregulation of these interactions is linked to cancer, viral pathogenesis, and developmental disorders.
• CRISPR knockout, point mutation, and knock-in models are essential to dissect the causal role of phosphorylation-dependent binding in disease.
Description
Phosphorylation-dependent protein binding (GO:0140031) is a molecular function defined as binding to a protein upon phosphorylation of the target protein. This function is fundamental to cellular signaling because it converts a transient phosphorylation mark into a specific protein-protein interaction, thereby propagating signals and assembling dynamic complexes. Researchers study this term to understand how post-translational modifications create conditional binding surfaces that regulate processes ranging from transcription to mRNA stability. The importance of this function is underscored by its involvement in viral replication, cancer progression, and plant development. For example, the SARS-CoV-2 nucleocapsid protein undergoes a phosphorylation-dependent conformational switch that inhibits RNA binding, highlighting how this function can be subverted by pathogens. In cancer, coordinated phosphorylation of YAP by Lats and CK1 creates a phosphodegron that recruits SCF(beta-TRCP), leading to YAP degradation. These examples illustrate the broad biological and clinical relevance of phosphorylation-dependent protein binding.
phosphorylation-dependent protein binding At A Glance
| GO ID | GO:0140031 |
|---|---|
| GO term | phosphorylation-dependent protein binding |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Binding to a protein upon phosphorylation of the target protein |
| Related processes | Signal transduction, protein degradation, mRNA regulation, viral replication |
| Example proteins | 4E-BP2, p53, YAP, SARS-CoV-2 nucleocapsid, soybean G-proteins |
| Disease relevance | Cancer, viral infection, developmental disorders |
What Is GO:0140031?
Phosphorylation-dependent protein binding is the molecular function of selectively binding to a target protein only when that target protein carries a phosphate group on one or more residues. This definition, based on the QuickGO annotation for GO:0140031, emphasizes that the binding event is conditional on the phosphorylation state of the target, distinguishing it from phosphorylation-independent protein binding.
Why Is phosphorylation-dependent protein binding Important in Cell Biology?
Phosphorylation-dependent protein binding is a cornerstone of cellular signal transduction because it allows cells to respond to phosphorylation signals by recruiting specific binding partners. This function is critical for dynamic processes such as protein degradation, transcriptional regulation, and mRNA deadenylation. Its dysregulation can lead to cancer, viral pathogenesis, and developmental abnormalities. Understanding this function at the molecular level provides insights into disease mechanisms and identifies potential therapeutic targets.
• Enables signal transduction by converting phosphorylation marks into docking sites for effector proteins.
• Regulates protein stability, as seen for YAP through SCF(beta-TRCP)-mediated degradation.
• Controls DNA binding of p53 via a phosphorylation-dependent switch in its disordered transactivation domain.
• Modulates mRNA deadenylation rates through phosphorylation-dependent tuning.
• Plays a role in viral replication, exemplified by the SARS-CoV-2 nucleocapsid protein.
• Influences plant development, including nodule formation in soybean.
• Involved in conformational dynamics of 4E-BP2, affecting translation regulation.
• Provides a mechanism for multisite phosphorylation to fine-tune protein interactions.
• Dysregulation is linked to cancer, neurodegeneration, and infectious diseases.
• Offers targets for therapeutic intervention in diseases driven by aberrant phosphorylation.
What Happens During phosphorylation-dependent protein binding?
Phosphorylation of the target protein
In simple terms: A kinase adds a phosphate group to a specific amino acid on the target protein.
The process begins when a protein kinase phosphorylates serine, threonine, or tyrosine residues on the target protein. This phosphorylation event can be triggered by upstream signaling cascades and often occurs at multiple sites, creating a phospho-code. For example, the SARS-CoV-2 nucleocapsid protein undergoes phosphorylation that induces a conformational switch.
Recognition and binding by the reader protein
In simple terms: A reader protein recognizes the phosphate group and binds to the phosphorylated target.
Once phosphorylated, the target protein presents a binding surface that is recognized by reader domains such as SH2, PTB, or 14-3-3. This binding is highly specific and depends on the phosphorylation state. For instance, the phosphorylated p53 transactivation domain binds to its partners with altered affinity.
Conformational changes and complex assembly
In simple terms: Binding often changes the shape of the proteins and brings other proteins together.
Phosphorylation-dependent binding frequently induces conformational changes in both the target and the reader, leading to the assembly of multi-protein complexes. In 4E-BP2, multisite phosphorylation and binding alter its conformational dynamics, affecting its function. Similarly, the SARS-CoV-2 nucleocapsid protein undergoes a phosphorylation-dependent conformational switch that inhibits RNA binding.
Downstream signaling and functional outcomes
In simple terms: The binding event triggers specific cellular responses.
The formation of phosphorylation-dependent complexes leads to diverse outcomes, such as protein degradation, transcriptional regulation, or mRNA deadenylation. For example, coordinated phosphorylation of YAP by Lats and CK1 promotes its binding to SCF(beta-TRCP), resulting in YAP ubiquitination and degradation. In soybean, phosphorylation-dependent regulation of the G-protein cycle controls nodule formation.
Key Genes Involved in GO:0140031 phosphorylation-dependent protein binding
The following genes and proteins are central to phosphorylation-dependent protein binding, as evidenced by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| 4E-BP2 | Multisite phosphorylation alters conformational dynamics and binding | Translation regulation and mRNA deadenylation |
| p53 | Phosphorylation-dependent switch regulates DNA binding | Tumor suppression and DNA damage response |
| YAP | Phosphorylation by Lats and CK1 creates a phosphodegron for SCF(beta-TRCP) | Cancer and organ size control |
| SARS-CoV-2 N | Phosphorylation-dependent conformational switch inhibits RNA binding | Viral replication and pathogenesis |
| Soybean G-protein | Phosphorylation-dependent regulation of G-protein cycle | Nodule formation and symbiosis |
| CK1 | Phosphorylates YAP to promote degradation | Cancer and Wnt signaling |
| Lats | Phosphorylates YAP to promote degradation | Hippo signaling and cancer |
| SCF(beta-TRCP) | E3 ubiquitin ligase that binds phosphorylated YAP | Protein degradation and cancer |
| 14-3-3 | Reader protein that binds phosphorylated targets | Signal transduction and cancer |
| SH2 domain proteins | Bind phosphorylated tyrosine motifs | Immune signaling and cancer |
| PTB domain proteins | Bind phosphorylated tyrosine motifs | Signal transduction |
| mTOR | Kinase that phosphorylates 4E-BP2 | Translation control and cancer |
| Casein kinase 1 | Phosphorylates p53 and other targets | DNA damage response |
| PP2A | Phosphatase that reverses phosphorylation | Regulation of phosphorylation-dependent binding |
| BRCA1 | Phosphorylation-dependent interactions in DNA repair | Cancer susceptibility |
| EGFR | Phosphorylation-dependent binding in signaling | Cancer therapy |
| Src | Phosphorylates targets to create binding sites | Cancer and signaling |
How Is phosphorylation-dependent protein binding Regulated?
Phosphorylation-dependent protein binding is regulated by the opposing activities of kinases and phosphatases, which add or remove phosphate groups on target proteins. Kinases such as mTOR, CK1, and Lats phosphorylate specific residues to create binding sites, while phosphatases like PP2A reverse these marks. Multisite phosphorylation can fine-tune binding affinity and kinetics, as seen in 4E-BP2 and p53. Additionally, the conformational dynamics of intrinsically disordered regions influence the accessibility of phosphorylation sites and the subsequent binding events.
phosphorylation-dependent protein binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| YAP | Cancer (Hippo pathway dysregulation) | Knockout or point mutation in cancer cell lines |
| p53 | Cancer (tumor suppression) | Knock-in of phosphorylation-deficient mutants |
| SARS-CoV-2 N | Viral infection (COVID-19) | Overexpression in lung epithelial cells |
| 4E-BP2 | Translation dysregulation in cancer and neurodegeneration | Knockout and phospho-mutant knock-in in neurons |
| Soybean G-protein | Symbiosis and plant development | Knockout in soybean roots |
Cancer
Phosphorylation-dependent protein binding is frequently dysregulated in cancer. For example, the Hippo pathway kinase Lats and CK1 coordinately phosphorylate YAP, leading to its binding to SCF(beta-TRCP) and subsequent degradation. Loss of this regulation results in YAP accumulation and tumorigenesis. Similarly, phosphorylation-dependent interactions of p53 regulate its tumor suppressor function, and mutations that alter these events contribute to cancer.
Viral infection
Viruses exploit phosphorylation-dependent protein binding for replication. The SARS-CoV-2 nucleocapsid protein undergoes a phosphorylation-dependent conformational switch that inhibits RNA binding, a process critical for viral assembly and pathogenesis. Understanding these interactions may inform antiviral strategies.
Developmental and plant biology
In soybean, phosphorylation-dependent regulation of the G-protein cycle is essential for nodule formation during symbiosis. Disruption of this regulation impairs root nodule development, highlighting the importance of phosphorylation-dependent binding in developmental processes.
From phosphorylation-dependent protein binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does phosphorylation of YAP at specific sites mediate SCF(beta-TRCP) binding? | Point mutation (phospho-deficient) knock-in |
| What is the role of 4E-BP2 multisite phosphorylation in mRNA deadenylation? | Knockout and phospho-mimetic knock-in |
| How does p53 phosphorylation affect DNA binding? | Knock-in of phospho-mutants |
| Is SARS-CoV-2 N phosphorylation required for viral replication? | Overexpression of phospho-mutants |
| Does soybean G-protein phosphorylation regulate nodule formation? | Knockout and overexpression |
| Can CRISPR screening identify novel readers of phosphorylation? | Library screening with phospho-peptide baits |
How to Study the phosphorylation-dependent protein binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Phosphoproteomics | Phosphorylation sites and stoichiometry | Identify phospho-dependent binding sites |
| NMR spectroscopy | Conformational changes upon phosphorylation | Study disordered proteins like 4E-BP2 |
| Pull-down assay | Binding affinity between phosphorylated target and reader | Validate interactions |
| CRISPR knockout | Loss-of-function phenotypes | Determine gene necessity |
| Point mutation knock-in | Effect of specific phosphorylation sites | Dissect phospho-code |
| Overexpression | Gain-of-function effects | Model viral proteins |
| Library screening | Identify novel readers or substrates | Discover new components |
Phosphoproteomics
Mass spectrometry-based phosphoproteomics identifies phosphorylation sites on target proteins and can reveal changes in phosphorylation-dependent interactions. This method is often combined with affinity purification to detect binding partners.
Structural biology
NMR and X-ray crystallography provide atomic-level insights into how phosphorylation induces conformational changes that enable binding, as seen for 4E-BP2 and p53.
Biochemical binding assays
Pull-down assays, isothermal titration calorimetry, and surface plasmon resonance measure the affinity and specificity of phosphorylation-dependent interactions.
Functional genomics
CRISPR knockout and point mutation screens can systematically test the role of phosphorylation sites in binding and downstream phenotypes.
How CRISPR Can Be Used to Study GO:0140031 phosphorylation-dependent protein binding
Knockout
CRISPR knockout of genes encoding kinases or reader proteins can abolish phosphorylation-dependent binding, revealing its role in cellular processes. For example, knockout of Lats or CK1 prevents YAP degradation.
Point Mutation
Introducing point mutations at phosphorylation sites (e.g., Ser to Ala) via CRISPR can specifically disrupt binding without affecting other functions. This approach has been used to study p53 DNA binding.
Knock-in
Knock-in of phospho-mimetic (e.g., Ser to Asp) or phospho-deficient mutants allows constitutive activation or inactivation of binding. This is valuable for studying 4E-BP2 dynamics.
Overexpression
Overexpression of wild-type or mutant proteins can model gain-of-function effects, such as viral nucleocapsid phosphorylation. This is useful for studying SARS-CoV-2 N.
How EDITGENE Supports phosphorylation-dependent protein binding Research
Researchers studying phosphorylation-dependent protein binding-related genes often need to determine whether a candidate gene is causally involved in a specific biological process or disease. EDITGENE provides comprehensive CRISPR-based services to address these questions with precision and scale.
Contact EDITGENE today to design your custom CRISPR model for phosphorylation-dependent protein binding research.
Frequently Asked Questions About phosphorylation-dependent protein binding
What is phosphorylation-dependent protein binding?
It is the molecular function of binding to a protein only after that protein has been phosphorylated, as defined by GO:0140031.
What genes are involved in phosphorylation-dependent protein binding?
Key genes include 4E-BP2, p53, YAP, SARS-CoV-2 N, and soybean G-proteins, among others.
How does phosphorylation regulate protein binding?
Phosphorylation adds a phosphate group that creates a docking site for reader domains, inducing binding and often conformational changes.
What diseases are associated with phosphorylation-dependent protein binding?
Cancer, viral infections, and developmental disorders are linked to dysregulation of this function.
What methods are used to study phosphorylation-dependent protein binding?
Phosphoproteomics, NMR, pull-down assays, and CRISPR screens are commonly used.
Can CRISPR be used to study phosphorylation-dependent binding?
Yes, CRISPR knockout, point mutation, and knock-in models are powerful tools to dissect this function.
What is the role of YAP phosphorylation in cancer?
Phosphorylation of YAP by Lats and CK1 promotes its binding to SCF(beta-TRCP), leading to degradation; loss of this regulation contributes to cancer.
How does SARS-CoV-2 nucleocapsid protein use phosphorylation-dependent binding?
Its phosphorylation induces a conformational switch that inhibits RNA binding, which is important for viral replication.
What is the significance of multisite phosphorylation in 4E-BP2?
Multisite phosphorylation alters 4E-BP2 conformational dynamics and its binding to partners, affecting mRNA deadenylation.
How can EDITGENE help my research on phosphorylation-dependent protein binding?
EDITGENE offers knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services tailored to your project.
Conclusion
Phosphorylation-dependent protein binding (GO:0140031) is a fundamental molecular function that translates phosphorylation signals into specific protein interactions, governing diverse cellular processes. Its dysregulation is implicated in cancer, viral infection, and developmental disorders. Advances in CRISPR technology and phosphoproteomics continue to unravel the complexities of this function, offering new avenues for therapeutic intervention. EDITGENE stands ready to support researchers in exploring this dynamic field with customized CRISPR models and screening services.
References
- 1. Botova M et al.. 2024. A specific phosphorylation-dependent conformational switch in SARS-CoV-2 nucleocapsid protein inhibits RNA binding.. Sci Adv 10(31):eaax2323 PMID: 39093972
- 2. Lu ZC et al.. 2021. Phosphate binding sites prediction in phosphorylation-dependent protein-protein interactions.. Bioinformatics 37(24):4712-4718 PMID: 34270697
- 3. Smyth S et al.. 2022. Multisite phosphorylation and binding alter conformational dynamics of the 4E-BP2 protein.. Biophys J 121(16):3049-3060 PMID: 35841142
- 4. Cannon JF. 2020. Novel phosphorylation-dependent regulation in an unstructured protein.. Proteins 88(2):366-384 PMID: 31512287
- 5. Choudhury SR et al.. 2015. Phosphorylation-Dependent Regulation of G-Protein Cycle during Nodule Formation in Soybean.. Plant Cell 27(11):3260-76 PMID: 26498905
- 6. Zhao B et al.. 2010. A coordinated phosphorylation by Lats and CK1 regulates YAP stability through SCF(beta-TRCP).. Genes Dev 24(1):72-85 PMID: 20048001
- 7. Sun X et al.. 2021. A phosphorylation-dependent switch in the disordered p53 transactivation domain regulates DNA binding.. Proc Natl Acad Sci U S A 118(1) PMID: 33443163
- 8. Stowell JAW et al.. 2026. Phosphorylation-dependent tuning of mRNA deadenylation rates.. Nat Struct Mol Biol 33(1):63-70 PMID: 41184513
