GO:0005519 cytoskeletal regulatory protein binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005519 (cytoskeletal regulatory protein binding) is a molecular function describing the selective binding of a protein to another protein that modulates cytoskeletal reorganization.
• This activity is central to dynamic processes such as actin remodeling, microtubule nucleation, and centrosome function, and it is often mediated by adaptor or scaffolding proteins.
• Key proteins annotated with this function include CRMP2, MTSS1, BAG3, and AQP2, which interact with cytoskeletal regulators in diverse cellular contexts.
• Dysregulation of cytoskeletal regulatory protein binding is implicated in cancer progression, neurodegeneration, and renal disorders.
• Experimental approaches to study this term include knockout, point-mutation, knock-in, and overexpression models, combined with imaging, proteomics, and functional assays.
• Understanding GO:0005519 helps researchers dissect how cells spatially and temporally control cytoskeletal dynamics in health and disease.
Description
The Gene Ontology (GO) term GO:0005519, cytoskeletal regulatory protein binding, defines a molecular function in which a protein selectively binds to another protein that is involved in modulating the reorganization of the cytoskeleton. This function is essential for translating cellular signals into mechanical and structural changes, such as actin polymerization, microtubule dynamics, and centrosome positioning. Researchers study this term to understand how cells coordinate motility, division, and intracellular transport, and how these processes go awry in disease. Because cytoskeletal regulatory protein binding often involves transient, context-dependent interactions, it is a challenging but high-value target for functional genomics and drug discovery.
cytoskeletal regulatory protein binding At A Glance
| GO ID | GO:0005519 |
|---|---|
| GO term | cytoskeletal regulatory protein binding |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Binding to a protein that modulates cytoskeletal reorganization |
| Example interactors | CRMP2, MTSS1, BAG3, AQP2, TRPV4 |
| Associated processes | Actin remodeling, microtubule dynamics, centrosome function |
| Disease relevance | Cancer, neurodegeneration, renal disorders |
| Research methods | Co-IP, FRET, live-cell imaging, CRISPR perturbation |
What Is GO:0005519?
In simple terms, GO:0005519 describes the ability of a protein to physically attach to another protein whose job is to control how the cytoskeleton is rearranged. The QuickGO definition states: Binding to a protein involved in modulating the reorganization of the cytoskeleton. This function is a molecular activity, not a whole pathway, and it is typically measured by biochemical interaction assays, imaging of cytoskeletal dynamics, or genetic perturbation of the binding partner.
Why Is cytoskeletal regulatory protein binding Important in Cell Biology?
Cytoskeletal regulatory protein binding is a linchpin of cellular adaptation because it allows cells to rapidly reorganize their internal architecture in response to mechanical, chemical, and developmental cues. Disrupting these interactions can impair cell migration, division, and signaling, contributing to cancer metastasis, neurodegeneration, and kidney dysfunction. Therefore, mapping and manipulating GO:0005519 interactions is critical for both basic cell biology and translational research.
• Controls actin and microtubule dynamics required for cell shape and motility.
• Regulates centrosome function and mitotic spindle assembly.
• Mediates mechanotransduction and cellular responses to mechanical strain.
• Involved in renal water transport through AQP2-TRPV4 interaction.
• Linked to cancer progression via MTSS1-dependent actin remodeling.
• Implicated in neurodegeneration through BAG3 and TDP-43 co-aggregation with actin-binding proteins.
• Provides targets for therapeutic intervention in metastasis and fibrosis.
• Enables redox signaling through CRMP2-peroxiredoxin interaction.
• Essential for cardiac myofilament organization via myosin-binding protein C.
• Offers a functional readout for CRISPR screens and proteomic studies.
Molecular Mechanism of cytoskeletal regulatory protein binding
Recognition and Binding of Cytoskeletal Regulators
In simple terms: The protein grabs onto a partner that controls the cytoskeleton.
Cytoskeletal regulatory protein binding begins with the specific recognition of a target protein that modulates cytoskeletal reorganization. For example, AQP2 binds TRPV4 in renal cells, influencing cytoskeletal dynamics and water transport. Similarly, the cochaperone BAG3 interacts with actin-binding proteins under mechanical strain, coordinating protein synthesis and autophagy. These interactions are often mediated by short linear motifs or folded domains that confer specificity and reversibility.
Conformational Changes and Complex Assembly
In simple terms: Binding triggers shape changes that assemble a working complex.
Upon binding, conformational changes in both partners can stabilize the complex and recruit additional factors. For instance, MTSS1-dependent ubiquitin modifications mediated by FBXO44 remodel the actin cytoskeleton, requiring sequential assembly of a multi-protein complex. In cardiac myofilaments, the N-terminal extension of myosin-binding protein C regulates binding to actin and myosin, affecting contractility. Such assembly is often regulated by post-translational modifications and cofactors.
Spatial and Temporal Regulation
In simple terms: The cell controls where and when the binding happens.
Cytoskeletal regulatory protein binding is tightly regulated in space and time. BAG3 coordinates mTORC1 spatial regulation under mechanical strain, linking cytoskeletal binding to autophagy and translation. In the centrosome, a high-affinity binding protein for the regulatory subunit of cAMP-dependent protein kinase II anchors signaling to microtubule organization. These examples illustrate how scaffolding and adaptor proteins localize binding events to specific subcellular compartments.
Downstream Effects on Cytoskeletal Dynamics
In simple terms: The binding event changes how the cytoskeleton moves and grows.
The functional outcome of cytoskeletal regulatory protein binding is altered cytoskeletal dynamics, such as actin polymerization, depolymerization, or microtubule stability. CRMP2 interaction with peroxiredoxin modulates redox signaling and cytoskeletal regulation. MTSS1-FBXO44-mediated ubiquitination promotes actin remodeling and gastric cancer progression. In contrast, the Schistosoma mansoni protein Sm16 lacks microtubule-regulatory activity despite being a membrane-binding protein, highlighting the need for functional validation.
Cofactors and Modifications
In simple terms: Other molecules can switch the binding on or off.
Cofactors such as ATP, calcium, and ubiquitin-like modifiers influence cytoskeletal regulatory protein binding. For example, FBXO44-mediated ubiquitination is a prerequisite for MTSS1-dependent actin remodeling. Phosphorylation by cAMP-dependent protein kinase II can modulate centrosomal binding. Redox state affects CRMP2-peroxiredoxin interaction, suggesting that oxidative stress can rewire cytoskeletal regulation.
Key Genes Involved in GO:0005519 cytoskeletal regulatory protein binding
The following genes and proteins are experimentally linked to cytoskeletal regulatory protein binding (GO:0005519) based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| AQP2 | Water channel; binds TRPV4 to modulate renal cytoskeleton | Renal water transport and cytoskeletal dynamics |
| TRPV4 | Calcium-permeable channel; interacts with AQP2 | Mechanosensation and renal function |
| BAG3 | Cochaperone; binds actin-binding proteins and HSP70 | Mechanical strain, autophagy, neurodegeneration |
| HSP70 | Chaperone; co-aggregates with BAG3 and actin-binding proteins | Protein quality control and cytoskeletal integrity |
| TDP-43 | RNA-binding protein; forms inclusions with BAG3 and actin-binding proteins | Neurodegeneration (ALS/FTD) |
| CRMP2 | Cytoskeletal regulator; interacts with peroxiredoxin | Redox signaling and neuronal cytoskeleton |
| Peroxiredoxin | Antioxidant enzyme; binds CRMP2 | Redox relay and cytoskeletal regulation |
| MTSS1 | Actin cytoskeleton regulator; ubiquitinated by FBXO44 | Cancer progression and metastasis |
| FBXO44 | E3 ubiquitin ligase; mediates MTSS1 ubiquitination | Actin remodeling and gastric cancer |
| MYBPC3 | Cardiac myosin-binding protein C; regulates myofilament binding | Cardiac contractility and hypertrophy |
| Sm16/SmSLP | Schistosoma mansoni protein; membrane-binding, lacks microtubule activity | Parasite biology and cytoskeletal regulation |
| PRKAR2A | Regulatory subunit of PKA II; binds centrosomal protein | Centrosome function and signaling |
| Centrosomal PKA-binding protein | High-affinity binding protein for PKA II | Centrosome assembly and cell cycle |
| Actin | Major cytoskeletal component; target of regulatory binding | Cytoskeletal dynamics and cell motility |
| Tubulin | Microtubule subunit; regulated by binding proteins | Microtubule dynamics and mitosis |
| mTORC1 | Kinase complex; spatially regulated by BAG3 | Mechanical strain and autophagy |
| Myosin | Motor protein; interacts with MYBPC3 | Cardiac and skeletal muscle contraction |
How Is cytoskeletal regulatory protein binding Regulated?
Cytoskeletal regulatory protein binding is regulated at multiple levels. BAG3 coordinates protein synthesis and autophagy under mechanical strain through spatial regulation of mTORC1, linking cytoskeletal binding to metabolic control. Phosphorylation by cAMP-dependent protein kinase II modulates centrosomal binding. Ubiquitination by FBXO44 controls MTSS1-dependent actin remodeling. Redox state influences CRMP2-peroxiredoxin interaction, adding a layer of oxidative regulation. These mechanisms ensure that cytoskeletal reorganization is responsive to cellular demands.
cytoskeletal regulatory protein binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MTSS1 | Gastric cancer progression | Knockout and overexpression in gastric cancer cell lines |
| BAG3 | Neurodegeneration (ALS/FTD) | Knock-in of patient mutations in iPSC-derived neurons |
| CRMP2 | Redox-related neuronal dysfunction | Point mutation of redox-sensitive cysteines |
| AQP2 | Renal water transport disorders | Knockout in renal epithelial cells |
| MYBPC3 | Hypertrophic cardiomyopathy | Knock-in of cardiomyopathy mutations in cardiomyocytes |
Cancer Progression and Metastasis
MTSS1-dependent ubiquitin modifications mediated by FBXO44 remodel the actin cytoskeleton to promote gastric cancer progression. Disruption of cytoskeletal regulatory protein binding can therefore alter cell migration and invasion, making it a potential therapeutic target.
Neurodegeneration
TDP-43 skein-like inclusions are formed by BAG3- and HSP70-guided co-aggregation with actin-binding proteins, implicating cytoskeletal regulatory protein binding in ALS and FTD pathogenesis. CRMP2 interaction with peroxiredoxin suggests redox-dependent cytoskeletal dysregulation in neurons.
Renal Disorders
Functional interaction between AQP2 and TRPV4 in renal cells links cytoskeletal regulatory protein binding to water transport and kidney function. Dysregulation may contribute to nephrogenic diabetes insipidus or polycystic kidney disease.
Cardiac and Parasitic Diseases
MYBPC3 N-terminal extension regulates myofilament binding, with mutations linked to hypertrophic cardiomyopathy. In parasites, Sm16 lacks microtubule-regulatory activity, highlighting species-specific adaptations.
From cytoskeletal regulatory protein binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of MTSS1 affect actin remodeling? | MTSS1 knockout in gastric cancer cells |
| How does BAG3 mutation alter TDP-43 aggregation? | BAG3 point mutation knock-in in neurons |
| Can AQP2-TRPV4 interaction be disrupted? | AQP2 knockout or TRPV4 point mutation |
| What is the role of CRMP2 redox modification? | CRMP2 cysteine-to-serine point mutation |
| Does MYBPC3 N-terminal extension regulate myofilament binding? | MYBPC3 knock-in with truncated N-terminus |
| Can FBXO44-mediated ubiquitination be tracked? | FBXO44 knockout with tagged MTSS1 knock-in |
How to Study the cytoskeletal regulatory protein binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Co-IP | Physical interaction between proteins | Validate AQP2-TRPV4 binding |
| FRET | Conformational changes and binding dynamics | Monitor BAG3-actin interactions |
| AP-MS | Protein complex composition | Identify MTSS1-FBXO44 partners |
| Live-cell imaging | Spatiotemporal localization | Track cytoskeletal remodeling |
| CRISPR knockout | Loss-of-function phenotype | Test MTSS1 role in cancer |
| Point mutation knock-in | Domain-specific function | Dissect CRMP2 redox sites |
| Proximity ligation assay | In situ interaction | Detect AQP2-TRPV4 in kidney |
| Ribo-seq | Translation efficiency | Study BAG3-mTORC1 axis |
Co-Immunoprecipitation and Pull-Down Assays
Co-immunoprecipitation (co-IP) and GST pull-down are standard methods to detect physical interactions between a protein and its cytoskeletal regulatory partners. For example, AQP2-TRPV4 interaction was validated by co-IP in renal cells. These assays are often combined with mass spectrometry to identify novel binders.
Live-Cell Imaging and FRET
Live-cell imaging of fluorescently tagged cytoskeletal proteins allows real-time visualization of binding dynamics. FRET biosensors can detect conformational changes upon binding, as shown for BAG3 under mechanical strain. These methods are essential for understanding spatial and temporal regulation.
Proteomics and Interactomics
Affinity purification coupled to mass spectrometry (AP-MS) enables unbiased identification of cytoskeletal regulatory protein complexes. This approach has been used to map MTSS1-FBXO44 interactions and CRMP2-peroxiredoxin complexes. Quantitative proteomics can reveal changes in binding stoichiometry under different conditions.
Functional Perturbation with CRISPR
CRISPR knockout, point mutation, and knock-in models are powerful for testing the causal role of specific binding events. For instance, knockout of MTSS1 or FBXO44 alters actin remodeling and cancer cell migration. Point mutations in BAG3 or CRMP2 can dissect domain-specific functions.
How CRISPR Can Be Used to Study GO:0005519 cytoskeletal regulatory protein binding
Knockout
CRISPR knockout of genes encoding cytoskeletal regulatory proteins or their binding partners can reveal loss-of-function phenotypes. For example, MTSS1 knockout reduces actin remodeling and cancer cell invasion. BAG3 knockout impairs autophagy and protein quality control under mechanical strain.
Point Mutation
Point mutation knock-in allows precise dissection of binding interfaces. Mutating redox-sensitive cysteines in CRMP2 can abolish peroxiredoxin binding and alter cytoskeletal regulation. Similarly, mutations in MYBPC3 N-terminal extension affect myofilament binding.
Knock-in
Knock-in of tagged or disease-associated variants enables tracking and functional studies. Tagged MTSS1 knock-in can be used to monitor ubiquitination by FBXO44. Disease mutations in BAG3 or AQP2 can be introduced to model neurodegeneration or renal disorders.
Overexpression
Overexpression of wild-type or mutant cytoskeletal regulatory proteins can drive gain-of-function phenotypes. Overexpressing MTSS1 promotes actin remodeling and gastric cancer progression. Overexpressing CRMP2 mutants can disrupt neuronal cytoskeleton.
How EDITGENE Supports cytoskeletal regulatory protein binding Research
Researchers studying cytoskeletal regulatory protein binding-related genes often need to determine whether a candidate gene is causally involved in cytoskeletal reorganization, disease progression, or cellular signaling. EDITGENE provides end-to-end CRISPR services to generate precisely engineered cell models for such functional studies.
Contact EDITGENE today to design your custom CRISPR model for cytoskeletal regulatory protein binding research.
Frequently Asked Questions About cytoskeletal regulatory protein binding
What is GO:0005519?
GO:0005519 is the Gene Ontology molecular function term for cytoskeletal regulatory protein binding, defined as binding to a protein involved in modulating the reorganization of the cytoskeleton.
What genes are involved in cytoskeletal regulatory protein binding?
Key genes include AQP2, TRPV4, BAG3, HSP70, TDP-43, CRMP2, MTSS1, FBXO44, MYBPC3, and PRKAR2A, among others.
How is cytoskeletal regulatory protein binding studied?
Common methods include co-immunoprecipitation, FRET, live-cell imaging, proteomics, and CRISPR knockout or knock-in models.
What diseases are linked to cytoskeletal regulatory protein binding?
It is implicated in cancer progression, neurodegeneration, renal disorders, and cardiac hypertrophy.
What is the role of MTSS1 in cytoskeletal regulation?
MTSS1 is an actin cytoskeleton regulator whose ubiquitination by FBXO44 promotes gastric cancer progression.
How does BAG3 regulate the cytoskeleton?
BAG3 coordinates protein synthesis and autophagy under mechanical strain and co-aggregates with actin-binding proteins in neurodegeneration.
Can CRISPR be used to study cytoskeletal regulatory protein binding?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect these interactions.
What is the relationship between CRMP2 and peroxiredoxin?
CRMP2 interacts with peroxiredoxin in a putative redox relay that influences cytoskeletal regulation.
How does AQP2 interact with TRPV4?
AQP2 binds TRPV4 in renal cells, modulating cytoskeletal dynamics and water transport.
What experimental models are suitable for studying GO:0005519?
Knockout, point mutation, knock-in, and overexpression cell models, combined with imaging and proteomics, are suitable.
Conclusion
GO:0005519 cytoskeletal regulatory protein binding is a fundamental molecular function that governs how cells reorganize their cytoskeleton in response to diverse signals. Through interactions involving proteins such as AQP2, BAG3, CRMP2, and MTSS1, this activity impacts cancer, neurodegeneration, renal function, and cardiac biology. Continued research using CRISPR models and advanced imaging will further illuminate its mechanistic details and therapeutic potential.
References
- 1. Galizia L et al.. 2012. Functional interaction between AQP2 and TRPV4 in renal cells.. J Cell Biochem 113(2):580-9 PMID: 21938744
- 2. Lu S et al.. 2025. TDP-43 skein-like inclusions are formed by BAG3- and HSP70-guided co-aggregation with actin-binding proteins.. Nat Cell Biol 27(11):1925-1937 PMID: 41174004
- 3. Kathage B et al.. 2017. The cochaperone BAG3 coordinates protein synthesis and autophagy under mechanical strain through spatial regulation of mTORC1.. Biochim Biophys Acta Mol Cell Res 1864(1):62-75 PMID: 27756573
- 4. Pace PE et al.. 2018. Peroxiredoxin interaction with the cytoskeletal-regulatory protein CRMP2: Investigation of a putative redox relay.. Free Radic Biol Med 129:383-393 PMID: 30315937
- 5. Pan G et al.. 2026. MTSS1-dependent ubiquitin modifications mediated by FBXO44 remodel the actin cytoskeleton to promote gastric cancer progression.. Mol Cancer 25(1) PMID: 41998764
- 6. Bunch TA et al.. 2018. N-terminal extension in cardiac myosin-binding protein C regulates myofilament binding.. J Mol Cell Cardiol 125:140-148 PMID: 30359561
- 7. Holmfeldt P et al.. 2007. The Schistosoma mansoni protein Sm16/SmSLP/SmSPO-1 is a membrane-binding protein that lacks the proposed microtubule-regulatory activity.. Mol Biochem Parasitol 156(2):225-34 PMID: 17913257
- 8. Keryer G et al.. 1993. A high-affinity binding protein for the regulatory subunit of cAMP-dependent protein kinase II in the centrosome of human cells.. Exp Cell Res 204(2):230-40 PMID: 8440320
