GO:0045505 dynein intermediate chain binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045505 (dynein intermediate chain binding) is a molecular function defined as binding to an intermediate chain of the dynein complex.
• The dynein intermediate chain (DYNC1I1/DYNC1I2 in cytoplasmic dynein 1; WDR34 in dynein 2) is a key hub that links the dynein motor to dynactin, LIS1, Ndel1 and other regulators.
• Phosphorylation of the intermediate chain regulates its binding to dynactin, providing a switch for cargo engagement.
• The intermediate chain is intrinsically disordered and uses transient tertiary structures to interact with multiple partners.
• Dynein intermediate chain binding is essential for dynein-dynactin complex assembly, activation and retrograde trafficking in cells.
• Dysfunction of this interaction is linked to neurodevelopmental and ciliary diseases, making it a target for CRISPR-based disease modeling.
Description
Dynein intermediate chain binding (GO:0045505) is a molecular function that mediates the physical association of proteins with the intermediate chain subunit of the dynein motor complex. The dynein intermediate chain (IC) is a non-catalytic subunit that serves as a scaffold for assembling the dynein motor with its cofactors, including dynactin, LIS1 and Ndel1. This binding function is critical for the assembly and activation of the dynein-dynactin complex, which drives retrograde transport along microtubules. Researchers study this term to understand how motor proteins are regulated, how cargo specificity is achieved, and how mutations in dynein subunits contribute to human disease. The interaction between the IC and its partners is dynamic and regulated by phosphorylation, making it a paradigm for studying transient protein-protein interactions. Recent structural and biochemical studies have revealed conserved mechanisms by which the IC engages dynactin and other regulators.
dynein intermediate chain binding At A Glance
| GO ID | GO:0045505 |
|---|---|
| GO term | dynein intermediate chain binding |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Binding to an intermediate chain of the dynein complex, facilitating dynein-dynactin assembly and motor activation. |
| Dynein complex | Cytoplasmic dynein 1 (DYNC1I1/DYNC1I2) and dynein 2 (WDR34). |
| Key binding partners | Dynactin p150(Glued), LIS1, Ndel1, and light chains. |
| Regulation | Phosphorylation of the intermediate chain modulates dynactin binding. |
| Structural features | Intrinsically disordered with transient tertiary structures. |
What Is GO:0045505?
According to the Gene Ontology, GO:0045505 (dynein intermediate chain binding) is defined as the binding to an intermediate chain of the dynein complex. This molecular function describes the selective interaction between a protein and the intermediate chain subunit of dynein, a motor protein complex. The intermediate chain is a component of both cytoplasmic dynein 1 and axonemal dynein 2, and its binding partners include dynactin subunits, LIS1, Ndel1, and other regulatory proteins. This function is distinct from binding to other dynein subunits such as the heavy chain or light chains, and it is essential for dynein complex assembly and cargo attachment.
Why Is dynein intermediate chain binding Important in Cell Biology?
Dynein intermediate chain binding is essential for the assembly and activation of the dynein-dynactin complex, which is the major motor for retrograde transport in eukaryotic cells. This function is required for diverse processes including neuronal migration, mitotic spindle positioning, and ciliary protein trafficking. Mutations that disrupt this binding can lead to severe developmental and degenerative diseases, making it a focal point for understanding motor protein regulation and for developing therapeutic interventions.
• Required for dynein-dynactin complex assembly and activation.
• Regulates retrograde transport of cargo along microtubules.
• Phosphorylation of the intermediate chain controls dynactin binding.
• Involved in neuronal development and migration.
• Essential for ciliary retrograde protein trafficking via dynein 2.
• Linked to neurodevelopmental disorders such as lissencephaly.
• Target for cancer research due to roles in mitosis.
• Provides a model for studying intrinsically disordered protein interactions.
• Conserved from fungi to humans, enabling cross-species studies.
• Potential therapeutic target for ciliopathies.
What Happens During dynein intermediate chain binding?
Recognition and initial binding
In simple terms: The dynein intermediate chain recognizes and binds to partner proteins like dynactin.
The dynein intermediate chain (IC) directly binds to the dynactin subunit p150(Glued) through a conserved region, initiating the assembly of the dynein-dynactin complex. This interaction is mediated by the N-terminal domain of the IC, which contains multiple binding sites for dynactin and other regulators. Phosphorylation of the IC at specific residues can modulate this binding, providing a regulatory switch.
Conformational changes and complex assembly
In simple terms: Binding causes shape changes that allow the motor to assemble with its cofactors.
Upon binding to dynactin, the IC undergoes conformational changes that facilitate the recruitment of LIS1 and Ndel1, which are required for dynein activation. The intrinsically disordered nature of the IC allows it to adopt transient tertiary structures that are essential for interacting with multiple partners. These structural transitions are critical for the formation of a productive dynein-dynactin complex.
Activation and cargo engagement
In simple terms: The assembled complex becomes active and can attach to cargo for transport.
The binding of LIS1 and Ndel1 to the IC promotes the activation of dynein, enabling it to move along microtubules. The IC also interacts with light chains, which may regulate cargo specificity and motor processivity. This activation step is essential for retrograde transport of various cargoes, including vesicles and proteins.
Regulation by phosphorylation
In simple terms: Chemical tags on the intermediate chain can turn binding on or off.
Phosphorylation of the dynein intermediate chain regulates its binding to dynactin, with specific phosphorylation events inhibiting or promoting the interaction. This provides a dynamic mechanism for controlling dynein activity in response to cellular signals. The interplay between kinases and phosphatases thus fine-tunes the assembly and function of the dynein complex.
Key Genes Involved in GO:0045505 dynein intermediate chain binding
The following genes encode proteins that bind to or are part of the dynein intermediate chain binding function, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| DYNC1I1 | Cytoplasmic dynein 1 intermediate chain 1 | Binds dynactin, LIS1, Ndel1; regulates dynein assembly. |
| DYNC1I2 | Cytoplasmic dynein 1 intermediate chain 2 | Paralog of DYNC1I1; similar binding functions. |
| DCTN1 | Dynactin subunit p150(Glued) | Directly binds dynein intermediate chain. |
| PAFAH1B1 | LIS1 | Binds dynein intermediate chain; regulates dynein activation. |
| NDEL1 | Ndel1 | Binds dynein intermediate chain; involved in dynein assembly. |
| WDR34 | Dynein 2 intermediate chain | Binds light chains; required for ciliary trafficking. |
| DYNC1LI1 | Dynein light intermediate chain 1 | Interacts with dynein complex; may modulate IC binding. |
| DYNC1LI2 | Dynein light intermediate chain 2 | Paralog of DYNC1LI1. |
| DYNLL1 | Dynein light chain 1 | Binds intermediate chain; regulates motor activity. |
| DYNLL2 | Dynein light chain 2 | Binds intermediate chain. |
| DYNLT1 | Dynein light chain Tctex-type 1 | Binds intermediate chain. |
| DYNLT3 | Dynein light chain Tctex-type 3 | Binds intermediate chain. |
| DYNC1H1 | Dynein heavy chain | Motor subunit; interacts with intermediate chain. |
| DYNC2H1 | Dynein 2 heavy chain | Motor subunit of dynein 2. |
| BICD2 | Bicaudal D homolog 2 | Adaptor that links dynein to cargo; may interact with IC. |
| HOOK3 | Hook microtubule tethering protein 3 | Adaptor for dynein; may influence IC binding. |
How Is dynein intermediate chain binding Regulated?
The binding of the dynein intermediate chain to its partners is regulated by phosphorylation. Vaughan et al. (2001) demonstrated that phosphorylation of the intermediate chain regulates its binding to dynactin, providing a molecular switch for dynein complex assembly. This phosphorylation is dynamic and can be controlled by upstream kinases and phosphatases, although the specific enzymes involved are not fully defined in the cited literature. Additionally, the interaction with LIS1 and Ndel1 is required for dynein activation and is subject to regulation by these proteins. The intrinsically disordered nature of the intermediate chain allows for conformational plasticity that can be modulated by post-translational modifications and binding partners.
dynein intermediate chain binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PAFAH1B1 | Lissencephaly, neuronal migration defects | Knockout mouse, patient-derived iPSCs |
| WDR34 | Jeune syndrome (ciliopathy) | Knockout zebrafish, chondrocyte cell lines |
| DYNC1I2 | Neurodevelopmental disorders | CRISPR knockout in neuronal cells |
| NDEL1 | Schizophrenia, neurodevelopment | Knock-in mouse models |
| DCTN1 | Motor neuron disease | Overexpression in motor neurons |
Neurodevelopmental disorders
Mutations in genes encoding dynein intermediate chain binding partners, such as PAFAH1B1 (LIS1), cause lissencephaly, a severe neurodevelopmental disorder characterized by impaired neuronal migration. The binding of LIS1 to the dynein intermediate chain is critical for dynein activation, and disruption of this interaction leads to defects in neuronal positioning. Studies in model organisms have shown that the conserved roles of the intermediate chain and Ndel1 in dynein assembly are essential for brain development.
Ciliopathies
Dynein 2 intermediate chain WDR34 is required for ciliary retrograde protein trafficking, and mutations in WDR34 cause skeletal ciliopathies such as Jeune syndrome. The binding of WDR34 to light chains is essential for its function, and disruption of these interactions impairs ciliary signaling. This highlights the importance of dynein intermediate chain binding in human genetic diseases affecting cilia.
Cancer
Dynein-mediated transport is essential for mitosis, and alterations in dynein intermediate chain binding can lead to mitotic defects and aneuploidy, which are hallmarks of cancer. Although direct mutations in the intermediate chain are rare, dysregulation of its binding partners like LIS1 and Ndel1 has been implicated in cancer progression. Targeting the dynein-dynactin interaction is being explored as a potential anticancer strategy.
From dynein intermediate chain binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of DYNC1I2 affect dynein assembly? | CRISPR knockout in HeLa cells |
| How does phosphorylation of IC regulate dynactin binding? | Point mutation of phosphosites in DYNC1I1 |
| Can we visualize IC-dynactin interaction in live cells? | Knock-in of fluorescent tag at DYNC1I1 locus |
| Does overexpression of LIS1 enhance dynein activation? | Overexpression of PAFAH1B1 in neurons |
| What is the role of WDR34 in ciliary trafficking? | Knockout of WDR34 in retinal pigment epithelial cells |
| Can we screen for regulators of IC binding? | CRISPR library screening in haploid cells |
How to Study the dynein intermediate chain binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| GST pull-down | Direct protein-protein interaction | Mapping IC binding domains |
| Co-immunoprecipitation | Endogenous complex formation | Assessing IC-dynactin binding in cells |
| NMR spectroscopy | Conformational dynamics and binding interfaces | Studying disordered IC interactions |
| Cryo-EM | High-resolution structure of complexes | Visualizing dynein-dynactin assembly |
| Live-cell imaging | Localization and dynamics of proteins | Tracking IC and cargo in real time |
| CRISPR knockout | Loss-of-function phenotypes | Testing requirement of IC binding partners |
| Phosphorylation assays | Post-translational modification status | Regulation of IC binding |
Biochemical binding assays
In vitro binding assays such as GST pull-down and co-immunoprecipitation are used to study the interaction between the dynein intermediate chain and its partners. These methods allow quantification of binding affinities and identification of binding domains. Phosphorylation-dependent binding can be assessed using phosphomimetic mutants.
Structural biology
NMR spectroscopy and X-ray crystallography have been used to determine the structures of the intermediate chain and its complexes. NMR is particularly useful for studying intrinsically disordered regions and transient interactions. Recent cryo-EM studies have revealed the architecture of the dynein-dynactin complex.
Cell biology and imaging
Fluorescence microscopy and live-cell imaging are used to visualize the localization and dynamics of the dynein intermediate chain and its binding partners. Knock-in of fluorescent tags allows tracking of endogenous proteins. Functional assays such as cargo transport and ciliary trafficking can be monitored in knockout or mutant cells.
Genetic screens
CRISPR-based screens can identify genes that regulate dynein intermediate chain binding and dynein function. These screens can be performed in various cell types to uncover novel components of the dynein assembly pathway. Bioinformatics analysis of screen data helps prioritize candidate genes for further study.
How CRISPR Can Be Used to Study GO:0045505 dynein intermediate chain binding
Knockout
CRISPR knockout of genes encoding the dynein intermediate chain or its binding partners can reveal their essential roles in dynein assembly and cellular transport. For example, knockout of WDR34 in cells impairs ciliary trafficking, demonstrating its requirement for dynein 2 function. Knockout studies in model organisms have shown conserved roles for the intermediate chain in dynein activation.
Point Mutation
Point mutations can be introduced to mimic or abolish phosphorylation sites on the dynein intermediate chain, allowing dissection of regulatory mechanisms. For instance, mutation of specific serine residues can prevent dynactin binding and alter dynein function. Such models are valuable for understanding how post-translational modifications control motor activity.
Knock-in
Knock-in of fluorescent or affinity tags at the endogenous locus enables visualization and purification of the dynein intermediate chain and its complexes. Tagged knock-in models can be used for live-cell imaging and proteomic analysis of interacting partners. This approach preserves native regulation and expression levels.
Overexpression
Overexpression of the dynein intermediate chain or its binding partners can be used to study gain-of-function effects and dominant-negative phenotypes. For example, overexpression of LIS1 can enhance dynein activation and alter neuronal migration. Overexpression models are useful for biochemical purification of complexes.
How EDITGENE Supports dynein intermediate chain binding Research
Researchers studying dynein intermediate chain binding-related genes often need to determine whether a candidate gene is causally involved in dynein assembly, cargo transport, or disease. EDITGENE provides comprehensive CRISPR services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for dynein intermediate chain binding research.
Frequently Asked Questions About dynein intermediate chain binding
What is dynein intermediate chain binding?
Dynein intermediate chain binding (GO:0045505) is a molecular function defined as binding to an intermediate chain of the dynein complex, a key step in dynein assembly and cargo transport.
What genes are involved in dynein intermediate chain binding?
Genes include DYNC1I1, DYNC1I2, DCTN1, PAFAH1B1, NDEL1, and WDR34, among others.
How is dynein intermediate chain binding regulated?
It is regulated by phosphorylation of the intermediate chain, which modulates binding to dynactin.
What diseases are associated with dynein intermediate chain binding?
Mutations in binding partners like LIS1 cause lissencephaly, and WDR34 mutations cause ciliopathies such as Jeune syndrome.
What is the role of the dynein intermediate chain in cells?
It serves as a scaffold for assembling the dynein motor with dynactin, LIS1, and Ndel1, enabling retrograde transport.
How can I study dynein intermediate chain binding?
Common methods include GST pull-down, co-immunoprecipitation, NMR, cryo-EM, and live-cell imaging.
What CRISPR models are available for dynein intermediate chain binding?
Knockout, point mutation, knock-in, and overexpression models can be generated for genes involved in this function.
Is dynein intermediate chain binding conserved across species?
Yes, the roles of the intermediate chain and Ndel1 in dynein assembly are conserved from fungi to humans.
What is the structure of the dynein intermediate chain?
It is intrinsically disordered with transient tertiary structures that mediate multiple interactions.
Why is dynein intermediate chain binding important for cancer research?
Dynein-mediated transport is essential for mitosis, and dysregulation can lead to aneuploidy, a hallmark of cancer.
Conclusion
Dynein intermediate chain binding (GO:0045505) is a fundamental molecular function that orchestrates the assembly and activation of the dynein motor complex. Through interactions with dynactin, LIS1, Ndel1, and light chains, the intermediate chain serves as a critical hub for retrograde transport and ciliary trafficking. Dysregulation of this binding is linked to severe neurodevelopmental and ciliary diseases, underscoring its biomedical importance. Continued research using CRISPR-based models and advanced structural techniques will further illuminate the mechanisms and therapeutic potential of this interaction.
References
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- 2. Vaughan PS et al.. 2001. Cytoplasmic dynein intermediate chain phosphorylation regulates binding to dynactin.. J Biol Chem 276(28):26171-9 PMID: 11340075
- 3. Okada K et al.. 2023. Conserved roles for the dynein intermediate chain and Ndel1 in assembly and activation of dynein.. Nat Commun 14(1):5833 PMID: 37730751
- 4. Morgan JL et al.. 2021. Transient Tertiary Structures of Disordered Dynein Intermediate Chain Regulate its Interactions with Multiple Partners.. J Mol Biol 433(18):167152 PMID: 34273400
- 5. Di Nicola AJ et al.. 2025. Exploration of the interaction between dynein intermediate chain and dynactin p150(Glued) reveals a novel binding Interface.. Protein Sci 34(8):e70242 PMID: 40713938
- 6. Aimulajiang K et al.. 2022. Recombinant dynein light intermediate chain of Haemonchus contortus affects the functions of goat immune cells in vitro.. Parasitol Res 121(6):1699-1707 PMID: 35435508
- 7. Tsurumi Y et al.. 2019. Interactions of the dynein-2 intermediate chain WDR34 with the light chains are required for ciliary retrograde protein trafficking.. Mol Biol Cell 30(5):658-670 PMID: 30649997
- 8. Jara KA et al.. 2023. NMR Analysis of the Interactions and Conformational Plasticity of Dynein Intermediate Chain.. Methods Mol Biol 2623:241-256 PMID: 36602690
