GO:0045324 late endosome to vacuole transport: Vesicle Trafficking Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0045324 describes the directed movement of substances from late endosomes to the vacuole, a pathway analogous to endosome-to-lysosome transport in higher eukaryotes.
• In yeast, cargo reaches the prevacuolar compartment and late endosome before delivery to the vacuole, a route defined by the QuickGO term late endosome to vacuole transport.
• The pathway depends on vesicle budding, tethering, and fusion machinery, including Vps1 and other Vps proteins that control late endosome-to-vacuole traffic.
• Endosome-lysosome fusion in metazoans shares core mechanistic features with late endosome to vacuole transport, including Rab GTPases, SNAREs, and tethering complexes.
• Defects in late endosome homeostasis are linked to human disease, including vacuole-like cataract caused by PIKFYVE deficiency.
• Studying this pathway benefits from CRISPR knockout, point-mutation, knock-in, and overexpression models combined with imaging and proteomics.
Description
Late endosome to vacuole transport (GO:0045324) is the biological process that mediates the directed movement of substances from late endosomes to the vacuole. In the yeast Saccharomyces cerevisiae, endocytic content is delivered to the late endosome and then on to the vacuole, a pathway that is analogous to endosome-to-lysosome transport in mammalian cells. This process is essential for degradation and recycling of membrane proteins, lipids, and other cargo, and it represents a conserved trafficking route that connects endosomal sorting with terminal degradation. Researchers study GO:0045324 because it sits at the intersection of vesicle trafficking, organelle homeostasis, and disease-associated pathways. The pathway is coordinated by conserved machinery, including Vps1, which functions in late endosome-to-vacuole traffic. In metazoans, endosome-lysosome fusion is a related process that shares mechanistic principles with late endosome to vacuole transport. Disruption of late endosome homeostasis can have pathological consequences, as shown by PIKFYVE deficiency causing vacuole-like cataract through perturbation of late endosome homeostasis. Thus, GO:0045324 provides a framework for understanding how cells deliver cargo from late endosomes to the vacuole and how this route can be studied experimentally.
late endosome to vacuole transport At A Glance
| GO ID | GO:0045324 |
|---|---|
| GO term | late endosome to vacuole transport |
| Ontology | biological_process |
| Synonym | None |
| Major function | Directed movement of substances from late endosomes to the vacuole |
| Pathway context | Analogous to endosome to lysosome transport |
| Yeast route | Endocytic content is delivered to the late endosome and on to the vacuole after transport to the prevacuolar compartment |
| Key machinery | Vps1 and other Vps proteins function in late endosome-to-vacuole traffic |
| Related process | Endosome-lysosome fusion shares mechanistic features in metazoans |
What Is GO:0045324?
GO:0045324, late endosome to vacuole transport, is defined as the directed movement of substances from late endosomes to the vacuole. In yeast, after transport to the prevacuolar compartment, endocytic content is delivered to the late endosome and on to the vacuole, and this pathway is analogous to endosome to lysosome transport. The term therefore describes a specific trafficking step rather than a general degradation process, and it is classified as a biological process in the Gene Ontology.
Why Is late endosome to vacuole transport Important in Cell Biology?
Late endosome to vacuole transport is important because it controls the terminal delivery of cargo to the vacuole, a step required for degradation and recycling of membrane and soluble proteins. In yeast, this pathway is a model for endosome-to-lysosome transport, so understanding its machinery informs conserved principles of organelle trafficking. The process also has disease relevance: PIKFYVE deficiency perturbs late endosome homeostasis and induces vacuole-like cataract, demonstrating that late endosome dysfunction can cause pathology. In addition, late-penetrating viruses exploit endosomal trafficking routes, highlighting the broader biological significance of endosome-to-vacuole/lysosome transport. Therefore, GO:0045324 is a key term for researchers studying vesicle trafficking, organelle homeostasis, and disease mechanisms.
• Provides a defined trafficking step for cargo delivery from late endosomes to the vacuole.
• Serves as a yeast model for endosome-to-lysosome transport in higher eukaryotes.
• Requires conserved Vps proteins, including Vps1, for late endosome-to-vacuole traffic.
• Shares mechanistic features with endosome-lysosome fusion in metazoans.
• Contributes to degradation and recycling of membrane proteins and lipids.
• Is linked to disease when late endosome homeostasis is perturbed, as in PIKFYVE deficiency.
• Can be exploited by pathogens, including late-penetrating viruses that use endosomal routes.
• Is relevant to autophagy-related trafficking and organelle maturation.
• Provides a framework for CRISPR-based functional studies of trafficking genes.
• Helps interpret phenotypes of vacuole/lysosome dysfunction in model organisms.
What Happens During late endosome to vacuole transport?
Cargo arrival at the late endosome
In simple terms: Cargo first reaches the late endosome before it can be sent to the vacuole.
In yeast, after transport to the prevacuolar compartment, endocytic content is delivered to the late endosome and then on to the vacuole. This step defines the starting point of GO:0045324 and ensures that cargo destined for degradation is concentrated in the late endosome. The late endosome is therefore a sorting station where substances are prepared for the final leg of transport to the vacuole.
Vesicle budding and Vps1 function
In simple terms: Proteins such as Vps1 help form the carriers that move cargo from the late endosome to the vacuole.
Vps1 functions in late endosome-to-vacuole traffic, and its role is part of the machinery that mediates this transport step. The pathway requires coordinated budding and movement of vesicles from the late endosome toward the vacuole. This machinery is conserved in principle with other Vps proteins that control protein transport from the late Golgi to the vacuole, providing a broader context for understanding late endosome-to-vacuole traffic.
Tethering and docking at the vacuole
In simple terms: Before fusion, the vesicle must be captured and held at the vacuole membrane.
Delivery of substances from late endosomes to the vacuole requires that transport intermediates are recognized and docked at the target organelle. This step is conceptually similar to endosome-lysosome fusion in metazoans, where tethering and docking ensure specificity of membrane fusion. The QuickGO definition emphasizes directed movement from late endosomes to the vacuole, which includes the targeting of cargo to the correct destination.
Membrane fusion and cargo release
In simple terms: The carrier fuses with the vacuole and releases its contents for degradation.
The final step of late endosome to vacuole transport is fusion with the vacuole, allowing cargo to be delivered into the vacuolar lumen. In metazoans, endosome-lysosome fusion is a related process that shares core mechanistic features with this pathway. Autophagosome maturation also converges on late endosome/lysosome fusion, indicating that late endosome to vacuole transport is part of a broader network of degradative trafficking.
Regulation by late endosome homeostasis
In simple terms: The pathway must be kept in balance, and disrupting late endosome homeostasis can cause disease.
PIKFYVE deficiency perturbs late endosome homeostasis and induces vacuole-like cataract, showing that proper regulation of late endosome function is critical. This finding links the integrity of late endosome to vacuole transport to organelle homeostasis and disease. Therefore, the pathway is not only a constitutive trafficking route but also a regulated process whose disruption has pathological consequences.
Key Genes Involved in GO:0045324 late endosome to vacuole transport
The following genes and proteins are experimentally implicated in late endosome to vacuole transport or closely related endosome-to-lysosome trafficking steps.
| Gene | Major Role | Research Relevance |
|---|---|---|
| VPS1 | Functions in late endosome-to-vacuole traffic | Core machinery for studying GO:0045324 |
| VPS proteins (general) | Control protein transport from the late Golgi to the vacuole | Provide context for vacuolar trafficking pathways |
| PIKFYVE | Maintains late endosome homeostasis | Deficiency causes vacuole-like cataract |
| LAMP1 | Mediates lipid transport in Drosophila | Marker and functional component of endosomal/lysosomal compartments |
| Rab GTPases (general) | Regulate endosome-lysosome fusion | Conserved regulators of trafficking |
| SNAREs (general) | Mediate membrane fusion | Core fusion machinery for endosome-lysosome fusion |
| Tethering complexes (general) | Dock vesicles before fusion | Specificity factors in endosome-lysosome fusion |
| Autophagy-related proteins | Participate in autophagosome maturation | Connect late endosome/lysosome fusion to autophagy |
| Shiga toxin trafficking factors | Mediate early endosome-to-Golgi transport | Model for endosomal sorting and therapeutic targeting |
| Late-penetrating virus entry factors | Exploit endosomal routes | Link endosomal trafficking to viral infection |
| Vps1-associated machinery | Supports vesicle formation at late endosomes | Candidate targets for trafficking studies |
| Vacuolar fusion machinery | Executes terminal fusion with the vacuole | Essential for cargo delivery |
| Endosomal lipid regulators | Control membrane composition and homeostasis | Relevant to PIKFYVE-related phenotypes |
| Lysosomal/vacuolar hydrolases | Degrade delivered cargo | Functional readout of transport |
| Membrane recycling factors | Recycle components from endosomes | Balance transport and recycling |
| Cargo receptors | Sort cargo into the late endosome pathway | Determine specificity of transport |
| Organelle identity regulators | Maintain late endosome identity | Prevent mistargeting and disease |
How Is late endosome to vacuole transport Regulated?
Late endosome to vacuole transport is regulated at multiple levels, including the integrity of late endosome homeostasis and the activity of trafficking machinery. Vps1 functions in late endosome-to-vacuole traffic, indicating that specific regulatory proteins control this step. PIKFYVE activity is required to maintain late endosome homeostasis, and its deficiency perturbs this balance and causes vacuole-like cataract. In metazoans, endosome-lysosome fusion is regulated by conserved factors such as Rab GTPases, SNAREs, and tethering complexes, which together ensure timely and specific fusion. Autophagosome maturation also intersects with late endosome/lysosome fusion, providing an additional layer of regulation through autophagy-related machinery. Thus, the pathway is controlled by a combination of organelle homeostasis, vesicle trafficking regulators, and fusion machinery.
late endosome to vacuole transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PIKFYVE | Vacuole-like cataract via perturbed late endosome homeostasis | Knockout or point-mutation cell model with late endosome imaging |
| VPS1 | Late endosome-to-vacuole traffic defects | Yeast knockout and tagged knock-in for trafficking assays |
| LAMP1 | Lipid transport and endosomal/lysosomal function | Drosophila knockout or overexpression |
| Autophagy-related genes | Autophagosome maturation and pathophysiological implications | Knockout models with autophagy flux readouts |
| Shiga toxin trafficking factors | Early endosome-to-Golgi transport and therapeutic targeting | Knockout cells for toxin transport assays |
PIKFYVE deficiency and vacuole-like cataract
PIKFYVE deficiency induces vacuole-like cataract via perturbing late endosome homeostasis, directly linking GO:0045324-related late endosome function to a human-relevant disease phenotype. This finding shows that disruption of late endosome homeostasis can cause structural and functional defects in the lens. Researchers can use this connection to study how late endosome to vacuole transport contributes to organelle homeostasis in disease.
Endosome-lysosome fusion defects
Endosome-lysosome fusion is a related process in metazoans, and its dysfunction is associated with trafficking disorders. Because late endosome to vacuole transport is analogous to endosome-to-lysosome transport, defects in shared machinery may manifest as lysosomal storage or trafficking abnormalities. Studying GO:0045324 in yeast can therefore inform mechanisms relevant to human endosome-lysosome disease.
Pathogen exploitation of endosomal trafficking
Late-penetrating viruses exploit endosomal routes, and Shiga toxins depend on early endosome-to-Golgi transport, indicating that endosomal trafficking pathways are relevant to infection and intoxication. Targeting these routes has been proposed as a therapeutic strategy. This context highlights the broader disease relevance of endosomal transport processes that are mechanistically related to late endosome to vacuole transport.
Autophagy-related pathology
Autophagosome maturation intersects with late endosome/lysosome fusion, and defects in this network are linked to pathophysiological implications. Since late endosome to vacuole transport is part of degradative trafficking, its dysfunction may contribute to autophagy-related disease mechanisms. This connection provides a rationale for studying GO:0045324 in models of autophagy dysfunction.
From late endosome to vacuole transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is VPS1 required for late endosome to vacuole transport? | Yeast VPS1 knockout with cargo trafficking assays |
| Does a point mutation in a trafficking gene alter late endosome homeostasis? | CRISPR point-mutation cell model with imaging |
| Can a tagged protein be used to track late endosome-to-vacuole carriers? | Knock-in of an epitope tag at the endogenous locus |
| Does overexpression of a candidate gene enhance or block transport? | Overexpression cell model with quantitative trafficking readouts |
| Which genes regulate endosome-lysosome fusion? | CRISPR library screening in metazoan cells |
| How does PIKFYVE loss affect late endosome morphology? | PIKFYVE knockout with vacuole-like phenotype scoring |
How to Study the late endosome to vacuole transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Fluorescence microscopy | Localization and morphology of late endosomes and vacuoles | Assess transport defects in knockout cells |
| Live-cell imaging | Dynamics of cargo movement to the vacuole | Track late endosome to vacuole transport over time |
| Proteomics | Protein composition of trafficking compartments | Identify machinery associated with the pathway |
| CRISPR library screening | Genes required for endosome-lysosome fusion | Discover novel regulators |
| Autophagy flux assay | Degradative trafficking activity | Link late endosome function to autophagy |
| Yeast genetics | VPS1-dependent trafficking phenotypes | Test gene requirements in a model organism |
| Toxin transport assay | Early endosome-to-Golgi transport | Study endosomal sorting and therapeutic targeting |
| Viral entry assay | Endosomal route exploitation by late-penetrating viruses | Investigate pathogen trafficking dependencies |
Imaging of late endosome and vacuole trafficking
Fluorescence imaging of late endosome and vacuole markers allows direct visualization of cargo movement and organelle morphology. This approach is useful for assessing whether late endosome to vacuole transport is perturbed in knockout or point-mutation models. In yeast, trafficking of cargo to the vacuole can be followed with tagged reporters.
Proteomics of trafficking machinery
Proteomic analysis can identify proteins associated with late endosomes and vacuoles, including Vps proteins and fusion machinery. Such datasets help define the molecular composition of the transport pathway. Comparing wild-type and mutant cells can reveal changes in protein abundance or localization.
Genetic screens and CRISPR libraries
CRISPR library screening enables systematic identification of genes required for late endosome to vacuole transport or related endosome-lysosome fusion. Hits can be validated with individual knockout or point-mutation models. This strategy is powerful for discovering new regulators of the pathway.
Autophagy flux and degradative trafficking assays
Because autophagosome maturation intersects with late endosome/lysosome fusion, autophagy flux assays can report on the functional status of degradative trafficking. Combining these assays with late endosome markers provides a more complete picture of pathway activity. Such readouts are useful in disease models where late endosome homeostasis is disrupted.
How CRISPR Can Be Used to Study GO:0045324 late endosome to vacuole transport
Knockout
CRISPR knockout of genes such as VPS1 or PIKFYVE can be used to test their requirement for late endosome to vacuole transport. Loss-of-function models reveal whether a gene is essential for cargo delivery to the vacuole. Phenotypes such as vacuole-like cataract can be modeled in relevant cell types.
Point Mutation
Point mutations can dissect specific domains or residues required for trafficking function. For example, mutations in lipid-regulating enzymes may alter late endosome homeostasis without fully eliminating protein expression. Such models help distinguish catalytic from scaffolding functions.
Knock-in
Knock-in of tags or reporters at endogenous loci enables tracking of trafficking proteins and cargo in their native context. Tagged Vps1 or cargo receptors can be visualized to follow late endosome-to-vacuole movement. This approach preserves physiological expression levels.
Overexpression
Overexpression of candidate genes can test whether increased protein levels enhance or disrupt late endosome to vacuole transport. This is useful for identifying dominant-negative or gain-of-function effects. Overexpression models complement knockout studies to provide a full picture of gene function.
How EDITGENE Supports late endosome to vacuole transport Research
Researchers studying late endosome to vacuole transport-related genes often need to determine whether a candidate gene is causally involved in cargo delivery, organelle homeostasis, or disease-associated trafficking defects. EDITGENE provides CRISPR-based cell models and screening services that enable functional dissection of GO:0045324-related pathways with publication-ready reproducibility.
Contact EDITGENE today to design your custom CRISPR model for late endosome to vacuole transport research.
Frequently Asked Questions About late endosome to vacuole transport
What is GO:0045324 late endosome to vacuole transport?
GO:0045324 is the biological process describing the directed movement of substances from late endosomes to the vacuole, analogous to endosome to lysosome transport.
What happens during late endosome to vacuole transport?
In yeast, endocytic content is delivered to the late endosome and then on to the vacuole after transport to the prevacuolar compartment.
What genes are involved in late endosome to vacuole transport?
Key genes include VPS1, which functions in late endosome-to-vacuole traffic, and PIKFYVE, which maintains late endosome homeostasis.
How is late endosome to vacuole transport related to endosome-lysosome fusion?
The pathway is analogous to endosome to lysosome transport, and endosome-lysosome fusion in metazoans shares mechanistic features.
What diseases are linked to late endosome to vacuole transport?
PIKFYVE deficiency causes vacuole-like cataract via perturbed late endosome homeostasis, and related trafficking defects are linked to endosome-lysosome dysfunction.
How can I study late endosome to vacuole transport in the lab?
Common approaches include fluorescence imaging, proteomics, CRISPR knockout, and CRISPR library screening.
What is the role of Vps1 in late endosome to vacuole transport?
Vps1 functions in late endosome-to-vacuole traffic, supporting the machinery that moves cargo to the vacuole.
Is late endosome to vacuole transport conserved in humans?
The pathway is analogous to endosome to lysosome transport, and endosome-lysosome fusion in metazoans shares core mechanistic features.
How does PIKFYVE affect late endosome homeostasis?
PIKFYVE deficiency perturbs late endosome homeostasis and induces vacuole-like cataract.
What CRISPR models are useful for studying this pathway?
Knockout, point-mutation, knock-in, and overexpression models can all be used to dissect gene function in late endosome to vacuole transport.
Conclusion
GO:0045324 late endosome to vacuole transport defines a conserved trafficking step in which substances move from late endosomes to the vacuole, analogous to endosome-to-lysosome transport. The pathway depends on machinery such as Vps1 and is sensitive to perturbations in late endosome homeostasis, as illustrated by PIKFYVE deficiency and vacuole-like cataract. Studying this process with CRISPR-based models, imaging, proteomics, and screening approaches will continue to reveal how cells deliver cargo to the vacuole and how this pathway contributes to disease.
References
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- 3. Hayden J et al.. 2013. Vps1 in the late endosome-to-vacuole traffic.. J Biosci 38(1):73-83 PMID: 23385815
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- 5. Luzio JP et al.. 2010. Endosome-lysosome fusion.. Biochem Soc Trans 38(6):1413-6 PMID: 21118098
- 6. Lozach PY et al.. 2011. Late-penetrating viruses.. Curr Opin Virol 1(1):35-43 PMID: 22440565
- 7. Li D et al.. 2020. Targeting the Early Endosome-to-Golgi Transport of Shiga Toxins as a Therapeutic Strategy.. Toxins (Basel) 12(5) PMID: 32456007
- 8. Ma X et al.. 2025. PIKFYVE deficiency induces vacuole-like cataract via perturbing late endosome homeostasis.. Biochem Biophys Res Commun 747:151123 PMID: 39778216
