GO:0045334 clathrin-coated endocytic vesicle: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045334 (clathrin-coated endocytic vesicle) describes a clathrin-coated, membrane-bounded intracellular vesicle formed by invagination of the plasma membrane around an extracellular substance.
• Clathrin-mediated endocytosis is driven by the coordinated assembly of clathrin triskelia, adaptor proteins such as AP-2, and accessory factors including epsin and dynamin.
• The temporal ordering of clathrin-coated vesicle formation is regulated by phosphorylation of the AP-2 adaptor complex.
• Clathrin-coated endocytic vesicles are essential for nutrient uptake, receptor signalling, and synaptic vesicle recycling.
• Dysregulation of clathrin-coated vesicle formation is linked to cancer, neurodegeneration, and immune signalling defects.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable precise dissection of clathrin-coated endocytic vesicle components.
Description
Clathrin-coated endocytic vesicles (GO:0045334) are membrane-bounded intracellular carriers that form when the plasma membrane invaginates around extracellular cargo and becomes coated with a clathrin lattice. This vesicle intermediate is a central node in clathrin-mediated endocytosis (CME), the principal route by which eukaryotic cells internalize nutrients, signalling receptors, and pathogens. The term is defined in the Gene Ontology as a clathrin-coated, membrane-bounded intracellular vesicle formed by invagination of the plasma membrane around an extracellular substance, and it is classified under the cellular_component aspect. Understanding GO:0045334 is therefore fundamental for cell biologists studying membrane trafficking, signal transduction, and host-pathogen interactions. The molecular machinery that builds these vesicles is highly conserved, although mechanistic divergences exist between mammals, yeasts, and plants. Key players include clathrin heavy and light chains, the AP-2 adaptor complex, epsin, and dynamin, all of which cooperate to deform the membrane and select cargo. Because clathrin-coated endocytic vesicles sit at the interface between the cell and its environment, they are attractive targets for both basic research and therapeutic intervention. This article synthesizes authoritative QuickGO annotation and verified PubMed literature to provide a research-grade overview of GO:0045334, its components, assembly, regulation, disease relevance, and the CRISPR-based methods used to study it.
clathrin-coated endocytic vesicle At A Glance
| GO ID | GO:0045334 |
|---|---|
| GO term | clathrin-coated endocytic vesicle |
| Ontology | cellular_component |
| Synonym | None listed in QuickGO |
| Definition | A clathrin-coated, membrane-bounded intracellular vesicle formed by invagination of the plasma membrane around an extracellular substance |
| Major function | Mediates clathrin-mediated endocytosis of extracellular cargo, receptors, and pathogens |
| Key structural feature | Clathrin triskelion lattice surrounding a membrane-bounded vesicle |
| Associated machinery | Clathrin heavy/light chains, AP-2, epsin, dynamin, accessory proteins |
| Conservation | Present in mammals, yeasts, and plants with mechanistic divergences |
What Is GO:0045334?
GO:0045334 (clathrin-coated endocytic vesicle) is a cellular_component term describing a membrane-bounded intracellular vesicle that is coated with clathrin and is formed by invagination of the plasma membrane around an extracellular substance. In other words, it is the transient, clathrin-coated carrier that buds inward from the cell surface during clathrin-mediated endocytosis, before uncoating and fusion with downstream endosomal compartments.
Why Is clathrin-coated endocytic vesicle Important in Cell Biology?
Clathrin-coated endocytic vesicles are essential for cellular homeostasis because they control the uptake of nutrients, the turnover of plasma membrane receptors, and the transmission of signals from the cell surface. Defects in their formation or regulation contribute to a wide range of human diseases, including cancer, neurodegeneration, and immune disorders. Moreover, because these vesicles are the first step in many viral and bacterial entry pathways, they are a focal point for infectious disease research. Studying GO:0045334 therefore provides mechanistic insight into fundamental cell biology and identifies candidate targets for therapeutic intervention.
• Controls nutrient uptake and receptor-mediated internalization at the plasma membrane.
• Regulates cell signalling by determining the fate of activated receptors.
• Supports synaptic vesicle recycling and neurotransmission.
• Mediates entry of pathogens and toxins into host cells.
• Is implicated in cancer through altered receptor trafficking and signalling.
• Contributes to neurodegeneration when endocytic trafficking is perturbed.
• Modulates immune responses via termination of STING signalling.
• Provides a model system for studying membrane deformation and protein assembly.
• Is conserved across eukaryotes, enabling comparative mechanistic studies.
• Offers targets for drug delivery and therapeutic modulation of endocytosis.
What Happens During clathrin-coated endocytic vesicle?
Initiation and cargo selection
In simple terms: The cell first decides what to bring in by marking cargo with adaptor proteins at the membrane.
Clathrin-coated endocytic vesicle formation begins when the AP-2 adaptor complex is recruited to the plasma membrane, where it binds both phosphatidylinositol 4,5-bisphosphate and cytoplasmic sorting motifs on cargo proteins. This cargo selection step is tightly regulated and ensures that specific receptors and ligands are concentrated at the future vesicle site. Phosphorylation of AP-2 subunits has been shown to control the temporal ordering of this early stage.
Clathrin coat assembly and membrane invagination
In simple terms: A protein cage called clathrin builds up around the membrane and pulls it inward.
Once AP-2 and other adaptors are engaged, clathrin triskelia assemble into a polyhedral lattice that deforms the plasma membrane into a coated pit. Accessory proteins such as epsin facilitate membrane curvature and can support reconstitution of endocytic clathrin-coated vesicles even in the absence of AP-2 in some assays. The growing clathrin coat provides both mechanical support and a platform for recruiting additional endocytic factors.
Scission and release of the vesicle
In simple terms: The neck of the invagination is cut, releasing the coated vesicle into the cell.
As the invagination deepens, dynamin and other scission machinery assemble at the neck and catalyze membrane fission, releasing the clathrin-coated endocytic vesicle into the cytoplasm. This step is energy-dependent and is coordinated with actin dynamics in many cell types. The newly formed vesicle retains its clathrin coat transiently before uncoating.
Uncoating and downstream trafficking
In simple terms: The clathrin cage is removed so the vesicle can fuse with the next compartment.
After scission, the clathrin coat is disassembled by auxilin and Hsc70, allowing the vesicle to fuse with early endosomes. This uncoating step is essential for delivering cargo to downstream compartments and for recycling of coat components. Defects in uncoating can lead to aberrant endosomal trafficking and disease.
Key Genes Involved in GO:0045334 clathrin-coated endocytic vesicle
The following genes and proteins are core components or regulators of clathrin-coated endocytic vesicles (GO:0045334) and are widely studied using CRISPR-based models.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CLTC | Clathrin heavy chain; forms the triskelion lattice | Central structural component; knockout disrupts all CME |
| CLTA | Clathrin light chain A; regulates lattice assembly | Modulates coat stability and dynamics |
| CLTB | Clathrin light chain B; regulates lattice assembly | Isoform-specific functions in endocytosis |
| AP2A1 | AP-2 adaptor subunit alpha 1; cargo selection | Links cargo to clathrin; phosphorylation regulates timing |
| AP2B1 | AP-2 adaptor subunit beta 1; membrane recruitment | Essential for coated pit formation |
| AP2M1 | AP-2 adaptor subunit mu 1; binds cargo motifs | Key for cargo recognition and vesicle initiation |
| AP2S1 | AP-2 adaptor subunit sigma 1; complex stability | Mutations linked to signalling disorders |
| EPN1 | Epsin 1; membrane curvature and cargo recruitment | Supports vesicle reconstitution independent of AP-2 |
| EPN2 | Epsin 2; accessory endocytic factor | Modulates CME efficiency |
| DNM1 | Dynamin 1; scission of vesicle neck | Essential for vesicle release; neuronal function |
| DNM2 | Dynamin 2; scission in non-neuronal cells | Implicated in neuromuscular disease |
| STON2 | Stonin 2; adaptor for synaptic vesicle recycling | Links CME to neurotransmission |
| PICALM | Phosphatidylinositol binding clathrin assembly protein | Regulates coat assembly; linked to Alzheimer's disease |
| SH3GL2 | Endophilin A1; membrane curvature and scission | Accessory factor in CME |
| BIN1 | Bridging integrator 1; membrane curvature | Implicated in muscle and neuronal trafficking |
| GAK | Cyclin G associated kinase; uncoating regulation | Controls Hsc70-mediated uncoating |
| DNAJC6 | Auxilin; co-chaperone for uncoating | Mutations linked to Parkinson's disease |
How Is clathrin-coated endocytic vesicle Regulated?
Clathrin-coated endocytic vesicle formation is regulated at multiple levels, including phosphorylation of the AP-2 adaptor complex, which controls the temporal ordering of coat assembly. Accessory proteins such as epsin and dynamin are subject to post-translational modifications that fine-tune membrane curvature and scission. In immune cells, clathrin-associated AP-1 controls termination of STING signalling, linking endocytic trafficking to innate immunity. Additionally, the process is influenced by lipid composition, actin dynamics, and the availability of cargo. Comparative studies have revealed mechanistic divergences in regulation between mammals, yeasts, and plants.
clathrin-coated endocytic vesicle and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CLTC | Cancer, neurodegeneration | CRISPR knockout in cancer cell lines |
| PICALM | Alzheimer's disease | Knock-in of disease-associated variants in iPSCs |
| DNAJC6 | Parkinson's disease | Point-mutation knock-in in neuronal cells |
| AP2M1 | Immune signalling defects | Knockout in immune cell lines |
| DNM2 | Neuromuscular disease | Overexpression of mutant dynamin in myotubes |
Cancer
Altered clathrin-mediated endocytosis can promote tumorigenesis by changing the trafficking of growth factor receptors and their downstream signalling. Components of the clathrin-coated endocytic vesicle machinery are therefore investigated as potential therapeutic targets in oncology.
Neurodegeneration
Neurons rely heavily on clathrin-coated endocytic vesicles for synaptic vesicle recycling and receptor turnover. Mutations in endocytic genes such as DNAJC6 and PICALM have been associated with Parkinson's disease and Alzheimer's disease, respectively.
Immune signalling disorders
Clathrin-associated AP-1 controls the termination of STING signalling, and dysregulation of this pathway can lead to autoinflammatory or immunodeficiency phenotypes. This highlights the importance of clathrin-coated vesicle trafficking in innate immunity.
From clathrin-coated endocytic vesicle-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is CLTC essential for clathrin-coated vesicle formation? | CRISPR knockout of CLTC in HeLa cells |
| Does AP-2 phosphorylation regulate vesicle timing? | Point mutations in AP2M1 phosphorylation sites |
| How does PICALM variant affect endocytosis? | Knock-in of Alzheimer's-associated PICALM variant in iPSCs |
| Where does epsin localize during vesicle formation? | Tagged knock-in of EPN1 with fluorescent protein |
| Can overexpression of DNM2 rescue scission defects? | Overexpression of wild-type or mutant DNM2 |
| What is the role of AP-1 in STING trafficking? | Knockout of AP1 subunits in macrophages |
How to Study the clathrin-coated endocytic vesicle Process
| Method | What It Measures | Typical Application |
|---|---|---|
| TIRF microscopy | Real-time dynamics of coated pit formation | Visualizing clathrin and AP-2 recruitment |
| Electron microscopy | Ultrastructure of coated vesicles | Confirming vesicle morphology |
| Mass spectrometry | Protein composition of coated vesicles | Identifying novel endocytic factors |
| In vitro reconstitution | Minimal components for vesicle formation | Testing sufficiency of epsin vs AP-2 |
| CRISPR knockout | Loss-of-function phenotypes | Testing essentiality of CLTC, AP2M1 |
| CRISPR knock-in | Tagged or mutant protein expression | Localizing epsin or dynamin |
| RNA-seq | Transcriptional changes upon perturbation | Assessing compensatory responses |
Live-cell imaging
Fluorescently tagged clathrin, AP-2, and cargo proteins can be imaged in living cells to visualize the dynamics of clathrin-coated endocytic vesicle formation in real time. Total internal reflection fluorescence (TIRF) microscopy is particularly useful for studying events at the plasma membrane.
Proteomics and interactomics
Affinity purification coupled with mass spectrometry can identify the protein composition of clathrin-coated vesicles and their associated factors. This approach has been used to define the core endocytic machinery and its regulatory modifications.
In vitro reconstitution
Reconstitution assays using purified components have demonstrated that epsin, but not AP-2, can support the formation of endocytic clathrin-coated vesicles in vitro. Such systems allow precise dissection of the minimal machinery required for vesicle formation.
Genetic perturbation and CRISPR screening
CRISPR knockout, point-mutation, and knock-in models enable functional analysis of individual genes in clathrin-coated endocytic vesicle biology. High-throughput CRISPR library screening can identify novel regulators of endocytosis.
How CRISPR Can Be Used to Study GO:0045334 clathrin-coated endocytic vesicle
Knockout
CRISPR knockout of core genes such as CLTC, AP2M1, or DNM1 abolishes or severely impairs clathrin-coated endocytic vesicle formation, providing definitive loss-of-function evidence. These models are widely used to test the requirement of individual components in cargo uptake and downstream signalling.
Point Mutation
Point mutations can be introduced into genes like AP2M1 to mimic or block phosphorylation sites, allowing researchers to dissect the temporal regulation of vesicle formation. Such models are valuable for understanding how post-translational modifications control endocytic dynamics.
Knock-in
Knock-in of fluorescent tags or disease-associated variants (e.g., in PICALM or DNAJC6) enables real-time tracking of endogenous proteins and assessment of pathogenic mechanisms. These models preserve native expression levels and regulatory context.
Overexpression
Overexpression of wild-type or mutant forms of dynamin, epsin, or other accessory proteins can rescue or exacerbate endocytic defects, helping to establish causality. This approach is particularly useful for studying gain-of-function mechanisms.
How EDITGENE Supports clathrin-coated endocytic vesicle Research
Researchers studying clathrin-coated endocytic vesicle-related genes often need to determine whether a candidate gene is causally involved in vesicle formation, cargo selection, or disease-associated trafficking defects. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for clathrin-coated endocytic vesicle research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| DVL2 Knockout HEK293 Cell Line | EDJ-KQ297 | Human | 1856 | Details Get a Quote |
| INPP5F Knockout HEK293 Cell Line | EDJ-KQ998 | Human | 22876 | Details Get a Quote |
| CLTA Knockout HEK293 Cell Line | EDJ-KQ2164 | Human | 1211 | Details Get a Quote |
| SFTPB Knockout HEK293 Cell Line | EDJ-KQ2276 | Human | 6439 | Details Get a Quote |
| SFTPA2 Knockout HEK293 Cell Line | EDJ-KQ2397 | Human | 729238 | Details Get a Quote |
| CLTCL1 Knockout HEK293 Cell Line | EDJ-KQ2806 | Human | 8218 | Details Get a Quote |
| SFTPA1 Knockout HEK293 Cell Line | EDJ-KQ3414 | Human | 653509 | Details Get a Quote |
| SFTPC Knockout HEK293 Cell Line | EDJ-KQ3915 | Human | 6440 | Details Get a Quote |
| AP2A1 Knockout HEK293 Cell Line | EDJ-KQ4015 | Human | 160 | Details Get a Quote |
| AP2B1 Knockout HEK293 Cell Line | EDJ-KQ4018 | Human | 163 | Details Get a Quote |
| AP2A2 Knockout HEK293 Cell Line | EDJ-KQ4020 | Human | 161 | Details Get a Quote |
| AP2M1 Knockout HEK293 Cell Line | EDJ-KQ4286 | Human | 1173 | Details Get a Quote |
| CLTB Knockout HEK293 Cell Line | EDJ-KQ4295 | Human | 1212 | Details Get a Quote |
| MYO1E Knockout HEK293 Cell Line | EDJ-KQ5291 | Human | 4643 | Details Get a Quote |
| MYO6 Knockout HEK293 Cell Line | EDJ-KQ5303 | Human | 4646 | Details Get a Quote |
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Frequently Asked Questions About clathrin-coated endocytic vesicle
What is GO:0045334 clathrin-coated endocytic vesicle?
GO:0045334 is a Gene Ontology cellular_component term describing a clathrin-coated, membrane-bounded intracellular vesicle formed by invagination of the plasma membrane around an extracellular substance.
What genes are involved in clathrin-coated endocytic vesicle formation?
Key genes include CLTC, CLTA, CLTB, AP2A1, AP2B1, AP2M1, AP2S1, EPN1, EPN2, DNM1, DNM2, PICALM, and DNAJC6.
How is clathrin-coated endocytic vesicle regulated?
It is regulated by phosphorylation of AP-2, accessory proteins like epsin and dynamin, and lipid composition.
What diseases are associated with clathrin-coated endocytic vesicles?
They are linked to cancer, neurodegeneration, and immune signalling disorders.
What is the difference between clathrin-coated endocytic vesicle and clathrin-coated pit?
A clathrin-coated pit is the invaginating membrane structure at the cell surface, while the clathrin-coated endocytic vesicle is the released, membrane-bounded carrier after scission.
How can I study clathrin-coated endocytic vesicles in the lab?
Common methods include TIRF microscopy, electron microscopy, proteomics, in vitro reconstitution, and CRISPR-based genetic perturbation.
What is the role of AP-2 in clathrin-coated endocytic vesicles?
AP-2 is an adaptor complex that selects cargo and recruits clathrin to the plasma membrane during vesicle formation.
Can CRISPR be used to study clathrin-coated endocytic vesicles?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are widely used to dissect gene function in this process.
What is the function of dynamin in clathrin-coated endocytic vesicles?
Dynamin catalyzes scission of the vesicle neck, releasing the clathrin-coated endocytic vesicle into the cytoplasm.
Why is clathrin-coated endocytic vesicle important for drug delivery?
Because it mediates uptake of extracellular cargo, it is a target for designing therapeutics that enter cells via endocytosis.
Conclusion
GO:0045334 (clathrin-coated endocytic vesicle) represents a fundamental cellular_component that orchestrates the uptake of nutrients, receptors, and pathogens. Its formation requires the coordinated action of clathrin, AP-2, epsin, dynamin, and numerous accessory proteins, and is regulated by phosphorylation and lipid signals. Dysregulation of this process is implicated in cancer, neurodegeneration, and immune disorders, making it a compelling area of research. CRISPR-based models, including knockout, point mutation, knock-in, and overexpression, provide powerful tools to dissect the molecular mechanisms of clathrin-coated endocytic vesicle biology and to identify new therapeutic targets.
References
- 1. Kaksonen M et al.. 2018. Mechanisms of clathrin-mediated endocytosis.. Nat Rev Mol Cell Biol 19(5):313-326 PMID: 29410531
- 2. Johnson A. 2024. Mechanistic divergences of endocytic clathrin-coated vesicle formation in mammals, yeasts and plants.. J Cell Sci 137(16) PMID: 39161994
- 3. Wrobel AG et al.. 2019. Temporal Ordering in Endocytic Clathrin-Coated Vesicle Formation via AP2 Phosphorylation.. Dev Cell 50(4):494-508.e11 PMID: 31430451
- 4. McMahon HT et al.. 2011. Molecular mechanism and physiological functions of clathrin-mediated endocytosis.. Nat Rev Mol Cell Biol 12(8):517-33 PMID: 21779028
- 5. Owen DJ. 2004. Linking endocytic cargo to clathrin: structural and functional insights into coated vesicle formation.. Biochem Soc Trans 32(Pt 1):1-14 PMID: 14748702
- 6. Liu Y et al.. 2022. Clathrin-associated AP-1 controls termination of STING signalling.. Nature 610(7933):761-767 PMID: 36261523
- 7. Brod J et al.. 2020. Epsin but not AP-2 supports reconstitution of endocytic clathrin-coated vesicles.. FEBS Lett 594(14):2227-2239 PMID: 32337703
- 8. Morris SA et al.. 1989. Clathrin-coated vesicles.. Curr Opin Cell Biol 1(4):684-90 PMID: 2576383
