GO:0032029 myosin tail binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0032029 (myosin tail binding) is a molecular function defined as binding to the tail region of a myosin heavy chain.
• Myosin tail binding is essential for motor protein targeting, cargo transport, and cytoskeletal organization across species.
• Key myosin classes involved include myosin V, myosin VI, myosin XIX, myosin XI, and brush border myosin I.
• The tail domain mediates interactions with phospholipids, plastids, actin, and other proteins, influencing motor function and localization.
• Dysregulation of myosin tail interactions is linked to defects in endocytosis, organelle transport, and receptor signaling.
• CRISPR-based knockout, knock-in, and overexpression models enable precise dissection of myosin tail binding in health and disease.
Description
Myosin tail binding (GO:0032029) is a molecular function that describes the binding to the tail region of a myosin heavy chain. Myosins are ATP-dependent motor proteins that convert chemical energy into mechanical force along actin filaments, and their tail domains dictate cargo specificity, subcellular localization, and regulatory interactions. This function is critical for diverse cellular processes, including vesicle transport, organelle positioning, and cell motility. Understanding myosin tail binding is therefore fundamental to deciphering how motor proteins achieve spatial and temporal control within cells. Researchers study this term to uncover mechanisms of cytoskeletal dynamics, membrane trafficking, and signal transduction, with implications for developmental biology and disease.
myosin tail binding At A Glance
| GO ID | GO:0032029 |
|---|---|
| GO term | myosin tail binding |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Binding to the tail region of a myosin heavy chain |
| Related myosin classes | Myosin V, VI, XIX, XI, I |
| Cellular context | Cytoskeleton, vesicle transport, organelle positioning |
| Research relevance | Motor protein regulation, cargo transport, disease mechanisms |
What Is GO:0032029?
GO:0032029 (myosin tail binding) is defined as the binding to the tail region of a myosin heavy chain. In other words, it is the molecular interaction between a protein or other molecule and the C-terminal tail domain of a myosin motor protein, which typically mediates cargo attachment, light-chain association, or autoinhibition. This binding event is distinct from ATPase or actin-binding activities and often regulates myosin function and localization.
Why Is myosin tail binding Important in Cell Biology?
Myosin tail binding is important because it governs how myosin motors are targeted to specific cellular compartments and how they interact with cargoes, membranes, and regulatory proteins. Disruptions in these interactions can lead to defects in endocytosis, organelle inheritance, and receptor signaling, which are associated with human diseases. Moreover, myosin tail domains are emerging as hubs for post-translational regulation and protein-protein interactions, making them attractive targets for therapeutic intervention and basic research.
• Controls cargo selection and transport directionality in myosin motors.
• Regulates motor autoinhibition and activation through tail interactions.
• Essential for organelle positioning and inheritance, such as plastids and vacuoles.
• Influences endocytic trafficking and GPCR signaling via myosin VI tail interactions.
• Mediates membrane binding through phospholipid interactions in plant and animal myosins.
• Contributes to actin cytoskeleton organization and cell polarity.
• Implicated in sensory defects and developmental abnormalities when disrupted.
• Provides a target for CRISPR-based functional studies and drug discovery.
What Happens During myosin tail binding?
Recognition and initial contact
In simple terms: The tail of a myosin protein is recognized by a partner molecule, which then binds to it.
Myosin tail binding begins with the specific recognition of the tail domain by a binding partner, which can be another protein, a lipid membrane, or a cargo adaptor. This interaction is often mediated by conserved structural elements in the tail, such as coiled-coil regions or globular domains. For example, the globular tail domain of Chara myosin binds to phospholipid vesicles, indicating that membrane lipids can serve as binding partners.
Conformational changes and regulation
In simple terms: Binding to the tail can change the shape of the myosin, switching it on or off.
Upon binding, the myosin tail may undergo conformational changes that relieve autoinhibition or alter motor activity. In brush border myosin I, the tail region contains a calmodulin/phosphatidylserine switch that regulates actin binding, demonstrating that tail interactions can be modulated by calcium and lipids. Similarly, anti-myosin tail antibodies can compete or cooperate for binding sites, revealing dynamic regulation of tail accessibility.
Cargo attachment and transport
In simple terms: Once bound, the myosin can carry cargo to different parts of the cell.
Myosin tail binding often links the motor to specific cargoes, such as vesicles, organelles, or RNA-protein complexes. Myosin V, for instance, uses its tail domain to bind cargo adaptors and facilitate transport along actin filaments. In plant cells, myosin XI tail domains interact with plastids and stromules, enabling their movement and positioning. This cargo attachment is essential for polarized growth and organelle inheritance.
Membrane and lipid interactions
In simple terms: Some myosins bind directly to membranes through their tails.
Certain myosin tails can bind to phospholipids, allowing the motor to associate with membrane compartments. The Chara myosin globular tail domain binds to phospholipid vesicles, suggesting a role in membrane tethering. Brush border myosin I exhibits a phosphatidylserine-dependent switch that modulates its tail actin-binding activity. These interactions are critical for membrane trafficking and organelle dynamics.
Cooperative and competitive binding events
In simple terms: Multiple molecules can compete or cooperate to bind the same tail region.
Super-resolution microscopy has revealed that anti-myosin tail antibodies can bind cooperatively or competitively, indicating that the tail domain presents multiple interaction surfaces. This complexity allows for fine-tuned regulation of myosin function in response to cellular signals. Such binding dynamics are important for processes like endocytosis, where myosin VI tail interactions drive arrestin-independent internalization of GPCRs.
Key Genes Involved in GO:0032029 myosin tail binding
The following genes encode myosin heavy chains or related proteins whose tail regions are known to participate in myosin tail binding (GO:0032029) or are studied in that context.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MYO5A | Myosin Va heavy chain; cargo transport in neurons and melanocytes | Mutations cause Griscelli syndrome; tail binds cargo adaptors |
| MYO5B | Myosin Vb heavy chain; recycling endosome transport | Linked to microvillus inclusion disease; tail interactions studied |
| MYO6 | Myosin VI heavy chain; endocytosis and GPCR internalization | Tail binding drives arrestin-independent signaling |
| MYO19 | Myosin XIX; mitochondrial dynamics | Tail domain targets mitochondria; studied in cancer |
| MYO1A | Brush border myosin I; actin binding in intestinal cells | Tail has calmodulin/phosphatidylserine switch |
| MYO11 | Plant myosin XI; organelle movement | Tail binds plastids and stromules |
| MYO2 | Yeast myosin V; vacuole inheritance | Tail domain homologous to plant myosin XI |
| MYO10 | Myosin X; filopodia formation | Tail interactions with integrins and cargo |
| MYO7A | Myosin VIIa; stereocilia organization | Tail binding defects cause Usher syndrome |
| MYO3A | Myosin IIIa; actin bundle maintenance | Tail domain regulates motor activity |
| MYO18A | Myosin XVIIIA; Golgi organization | Tail binds Golgi membranes |
| MYO1C | Myosin Ic; nuclear and cytoplasmic functions | Tail interactions with lipids |
| MYO5C | Myosin Vc; secretory transport | Tail domain cargo binding |
| MYO9B | Myosin IXb; Rho GTPase signaling | Tail contains RhoGAP domain |
| MYO15A | Myosin XVa; hearing | Tail binds whirlin; mutations cause deafness |
| MYO1E | Myosin Ie; kidney function | Tail interactions in podocytes |
How Is myosin tail binding Regulated?
Myosin tail binding is regulated by multiple mechanisms, including calcium/calmodulin signaling, phosphorylation, and lipid interactions. In brush border myosin I, a calmodulin/phosphatidylserine switch controls tail actin-binding activity, allowing rapid responses to calcium signals. Antibody binding studies show that tail epitopes can be masked or exposed, suggesting conformational regulation. Additionally, cargo adaptors and light chains can modulate tail accessibility and binding affinity.
myosin tail binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MYO5A | Griscelli syndrome; neurological defects | Knockout mouse; patient iPSC-derived neurons |
| MYO6 | GPCR signaling; cancer progression | Knockout cell lines; xenograft models |
| MYO7A | Usher syndrome; hearing loss | Knock-in mouse; retinal organoids |
| MYO19 | Mitochondrial dynamics; cancer | Overexpression and knockout in HeLa cells |
| MYO1A | Intestinal brush border function | Knockout mouse; Caco-2 cells |
Myosin tail binding in cancer
Altered myosin tail interactions contribute to cancer cell migration, invasion, and metastasis. Myosin XIX, for example, is implicated in mitochondrial dynamics that support tumor growth, and its tail domain is under investigation as a therapeutic target. Myosin VI tail binding drives GPCR internalization, which can promote oncogenic signaling.
Myosin tail binding in neurological disorders
Defects in myosin tail binding are linked to neurological diseases such as Griscelli syndrome and Usher syndrome. Myosin Va tail mutations impair cargo transport in neurons, leading to pigmentary and neurological abnormalities. Myosin VIIa tail interactions are essential for stereocilia function, and their disruption causes hearing loss.
Myosin tail binding in organelle dysfunction
Disrupted myosin tail binding can cause organelle mislocalization and dysfunction. In plants, myosin XI tail mutations affect plastid movement, impacting photosynthesis and stress responses. In animal cells, myosin XIX tail interactions are required for mitochondrial distribution, and their loss leads to mitochondrial aggregation.
From myosin tail binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of myosin tail binding affect cargo transport? | CRISPR knockout of MYO5A in neurons |
| How do point mutations in the tail domain alter motor function? | Point mutation knock-in in MYO6 |
| Can a tagged tail domain reveal binding partners? | Knock-in of GFP-tagged MYO19 |
| Does overexpression of myosin tail enhance organelle movement? | Overexpression of MYO11 tail in plant cells |
| What is the role of tail phosphorylation in binding? | Point mutation at phosphosite in MYO1A |
| How does tail binding affect GPCR internalization? | Knockout of MYO6 in HEK293 cells |
How to Study the myosin tail binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Super-resolution microscopy | Nanoscale binding events | Antibody-tail interactions |
| Co-immunoprecipitation | Protein-protein interactions | Identifying tail-binding partners |
| GST pull-down | Direct binding to tail domain | Validating lipid or protein binding |
| Live-cell imaging | Organelle transport dynamics | Mitochondrial or plastid movement |
| CRISPR knockout | Loss-of-function phenotypes | Cargo transport defects |
| CRISPR knock-in | Tagged protein localization | GFP-tagged myosin tail |
| Phosphoproteomics | Phosphorylation of tail domain | Regulation of binding |
| Lipid overlay assay | Phospholipid binding | Membrane interaction |
Super-resolution microscopy
Super-resolution microscopy allows visualization of myosin tail binding at nanoscale resolution, revealing cooperative and competitive binding events. This method is used to study antibody or protein interactions with the tail domain in fixed and live cells.
Co-immunoprecipitation and pull-down assays
Co-immunoprecipitation and GST pull-down assays identify proteins that bind to the myosin tail domain. These techniques are essential for discovering novel tail-binding partners and validating interactions in vitro and in vivo.
Live-cell imaging of organelle transport
Live-cell imaging tracks the movement of organelles or vesicles that depend on myosin tail binding, such as mitochondria or plastids. Fluorescent tagging of myosin tails and cargoes enables quantitative analysis of transport dynamics.
CRISPR-based genetic screens
CRISPR knockout or knock-in screens can systematically test the function of myosin tail domains and their binding partners. These screens link genotype to phenotype, such as defects in endocytosis or organelle positioning.
How CRISPR Can Be Used to Study GO:0032029 myosin tail binding
Knockout
CRISPR knockout of myosin genes removes the entire protein, including the tail domain, allowing researchers to assess the loss of myosin tail binding on cellular processes such as endocytosis and organelle transport. For example, MYO6 knockout impairs GPCR internalization, demonstrating the importance of tail interactions.
Point Mutation
Point mutations can be introduced into the tail domain to disrupt specific binding interfaces without affecting motor activity. This approach is useful for dissecting the contribution of individual residues to myosin tail binding and regulation.
Knock-in
Knock-in of tagged or mutant myosin tails enables visualization and functional analysis of tail binding in live cells. For instance, GFP-tagged myosin XI tail can be used to track plastid interactions in plant cells.
Overexpression
Overexpression of wild-type or mutant myosin tail domains can act as dominant-negative or gain-of-function tools to probe tail binding effects on cargo transport and cell morphology. This is particularly useful in plant and animal models where endogenous myosin levels are low.
How EDITGENE Supports myosin tail binding Research
Researchers studying myosin tail binding-related genes often need to determine whether a candidate gene is causally involved in a specific cellular process or disease. EDITGENE provides a comprehensive suite of CRISPR services to accelerate this discovery, from knockout to knock-in and overexpression models, tailored to myosin tail binding research.
Contact EDITGENE today to design your custom CRISPR model for myosin tail binding research.
Frequently Asked Questions About myosin tail binding
What is myosin tail binding?
Myosin tail binding (GO:0032029) is the molecular function of binding to the tail region of a myosin heavy chain, which regulates motor targeting and cargo interactions.
What genes are involved in myosin tail binding?
Genes encoding myosin heavy chains such as MYO5A, MYO6, MYO19, MYO1A, and MYO11 are involved in myosin tail binding.
How is myosin tail binding regulated?
It is regulated by calcium/calmodulin, phospholipids, phosphorylation, and conformational changes in the tail domain.
What diseases are associated with myosin tail binding defects?
Defects are linked to Griscelli syndrome, Usher syndrome, cancer progression, and organelle dysfunction.
What methods are used to study myosin tail binding?
Super-resolution microscopy, co-immunoprecipitation, live-cell imaging, and CRISPR screens are commonly used.
Can CRISPR be used to study myosin tail binding?
Yes, CRISPR knockout, knock-in, and point mutation models allow precise dissection of myosin tail binding in cells and organisms.
Which myosin classes have tail domains that bind cargo?
Myosin V, VI, XIX, XI, and I are well-known for tail-mediated cargo binding.
What is the role of myosin tail binding in endocytosis?
Myosin VI tail binding drives arrestin-independent internalization and signaling of GPCRs.
How does myosin tail binding affect organelle transport?
It enables myosins to attach to organelles like mitochondria and plastids, facilitating their movement and positioning.
What EDITGENE services support myosin tail binding research?
EDITGENE offers knockout, point mutation, knock-in, overexpression, CRISPR library screening, and bioinformatics services.
Conclusion
Myosin tail binding (GO:0032029) is a fundamental molecular function that underpins motor protein targeting, cargo transport, and cellular organization. Its dysregulation contributes to a range of diseases, from neurological disorders to cancer. Advances in CRISPR-based models and imaging technologies continue to illuminate the mechanisms and regulatory networks of myosin tail binding, offering new opportunities for therapeutic intervention.
References
- 1. Quedan D et al.. 2023. Cooperative & competitive binding of anti-myosin tail antibodies revealed by super-resolution microscopy.. Arch Biochem Biophys 747:109753 PMID: 37714251
- 2. Bocanegra JL et al.. 2020. Myosin XIX.. Adv Exp Med Biol 1239:439-451 PMID: 32451871
- 3. Provance DW et al.. 1999. Myosin-V: head to tail.. Cell Mol Life Sci 56(3-4):233-42 PMID: 11212351
- 4. Patel NM et al.. 2024. Myosin VI drives arrestin-independent internalization and signaling of GPCRs.. Nat Commun 15(1):10636 PMID: 39638791
- 5. Nunokawa SY et al.. 2007. Binding of chara Myosin globular tail domain to phospholipid vesicles.. Plant Cell Physiol 48(11):1558-66 PMID: 17921149
- 6. Swanljung-Collins H et al.. 1994. Brush border myosin I has a calmodulin/phosphatidylserine switch and tail actin-binding.. Adv Exp Med Biol 358:205-13 PMID: 7801806
- 7. Arora AS et al.. 2023. Structural insights into actin isoforms.. Elife 12 PMID: 36790143
- 8. Sattarzadeh A et al.. 2009. A myosin XI tail domain homologous to the yeast myosin vacuole-binding domain interacts with plastids and stromules in Nicotiana benthamiana.. Mol Plant 2(6):1351-8 PMID: 19995734
