GO:0032510 endosome to lysosome transport via multivesicular body sorting pathway: Vesicle Trafficking Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0032510 describes the directed movement of substances from endosomes to lysosomes through multivesicular body (MVB) sorting, a process essential for protein degradation and cellular homeostasis.
• The pathway involves sorting of ubiquitinated membrane proteins into intraluminal vesicles (ILVs) of MVBs, which then fuse with lysosomes.
• Key molecular players include ESCRT complexes, RAB GTPases, and ATP13A2/PARK9, which regulate exosome secretion and alpha-synuclein clearance.
• Dysregulation of this pathway is linked to cancer progression, neurodegeneration, and lysosomal storage disorders.
• Research methods such as CRISPR knockout, knock-in, and overexpression models enable precise dissection of gene function in this pathway.
• EDITGENE provides comprehensive CRISPR services to study endosome to lysosome transport via MVB sorting, from library screening to bioinformatics.
Description
The endosome to lysosome transport via multivesicular body (MVB) sorting pathway, annotated as GO:0032510, is a fundamental cellular process that ensures the delivery of proteins and lipids from endosomes to lysosomes for degradation. This pathway involves the sorting of cargo into intraluminal vesicles (ILVs) within MVBs, which subsequently fuse with lysosomes, allowing the degradation of membrane proteins and lipids. It is critical for maintaining cellular homeostasis, and its dysfunction is implicated in various diseases, including cancer and neurodegeneration. Researchers study this pathway to understand how cells regulate protein turnover and how defects contribute to disease pathogenesis.
endosome to lysosome transport via multivesicular body sorting pathway At A Glance
| GO ID | GO:0032510 |
|---|---|
| GO term | endosome to lysosome transport via multivesicular body sorting pathway |
| Ontology | biological_process |
| Synonym | endosome to lysosome transport via MVB sorting pathway |
| Major function | Sorting and transport of proteins and lipids from endosomes to lysosomes for degradation |
| Key components | ESCRT complexes, RAB GTPases, ATP13A2/PARK9, CHMP4B |
| Associated diseases | Cancer, neurodegeneration, lysosomal storage disorders |
| Research methods | CRISPR knockout, knock-in, overexpression, proteomics, imaging |
What Is GO:0032510?
GO:0032510 is defined as the directed movement of substances from endosomes to lysosomes by a pathway in which molecules are sorted into multivesicular bodies, which then fuse with the lysosome. This process involves the recognition and sorting of ubiquitinated cargo into ILVs, the formation of MVBs, and their subsequent fusion with lysosomes, leading to the degradation of the cargo.
Why Is endosome to lysosome transport via multivesicular body sorting pathway Important in Cell Biology?
This pathway is essential for cellular homeostasis by controlling the degradation of membrane proteins and lipids, thereby regulating signal transduction, nutrient sensing, and quality control. Defects in MVB sorting are linked to cancer, where altered degradation of oncoproteins or growth factor receptors can drive tumorigenesis, and to neurodegenerative diseases such as Parkinson's, where impaired clearance of alpha-synuclein contributes to pathology. Understanding this pathway provides insights into basic cell biology and potential therapeutic targets.
• Regulates degradation of cell surface receptors, controlling signaling duration and intensity.
• Maintains cellular proteostasis by removing damaged or misfolded proteins.
• Plays a role in exosome biogenesis and secretion, impacting intercellular communication.
• Dysfunction leads to accumulation of toxic proteins, as seen in neurodegeneration.
• Alterations in the pathway are associated with cancer stemness and progression.
• Modulates immune responses by regulating antigen presentation.
• Involved in viral budding and release, as viruses hijack ESCRT machinery.
• Affects lysosomal function and autophagy flux, critical for cell survival.
• Provides targets for therapeutic intervention in lysosomal storage disorders.
• Serves as a model for studying membrane trafficking and organelle biogenesis.
What Happens During endosome to lysosome transport via multivesicular body sorting pathway?
Cargo Recognition and Ubiquitination
In simple terms: Proteins destined for degradation are tagged with ubiquitin.
Membrane proteins are modified with ubiquitin chains, which serve as signals for sorting into the MVB pathway. This ubiquitination is recognized by ESCRT complexes, particularly ESCRT-0, which binds to ubiquitinated cargo and initiates the sorting process. The specificity of cargo selection is crucial for ensuring that only appropriate proteins are targeted for degradation.
ESCRT-Mediated Sorting and ILV Formation
In simple terms: The ESCRT machinery packages tagged proteins into small vesicles inside the endosome.
Following ubiquitination, ESCRT complexes (ESCRT-0, -I, -II, -III) sequentially assemble on the endosomal membrane to deform it inward, forming intraluminal vesicles (ILVs). ESCRT-III, with subunits like CHMP4B, drives membrane scission to release ILVs into the endosomal lumen, creating a multivesicular body (MVB). This process is highly regulated and requires ATP and specific lipids.
MVB Maturation and Transport
In simple terms: The multivesicular body matures and moves toward the lysosome.
After ILV formation, the MVB undergoes maturation, involving changes in protein composition and lipid content. RAB GTPases, such as RAB31, mark and control distinct MVB populations, facilitating their transport along cytoskeletal tracks to the lysosome. This step ensures that MVBs are correctly targeted to lysosomes for fusion.
Fusion with Lysosome and Cargo Degradation
In simple terms: The multivesicular body fuses with the lysosome, and its contents are degraded.
MVBs fuse with lysosomes in a process mediated by SNARE proteins and RAB GTPases, delivering ILVs into the lysosomal lumen. The acidic environment and hydrolases within the lysosome degrade the ILV membranes and cargo, recycling the resulting molecules. This final step is essential for the complete turnover of sorted proteins and lipids.
Key Genes Involved in GO:0032510 endosome to lysosome transport via multivesicular body sorting pathway
The following genes and proteins are key players in the endosome to lysosome transport via MVB sorting pathway, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| RAB31 | Marks and controls an ESCRT-independent exosome pathway | Regulates exosome secretion and cargo sorting |
| ATP6V1D | Lysosome acidification and stemness in hepatocellular carcinoma | Drives cancer progression via lysosomal function |
| CHMP4B | ESCRT-III subunit, involved in membrane scission | Regulates autophagy-lysosomal flux and exosome release |
| ATP13A2/PARK9 | Regulates exosome secretion and alpha-synuclein clearance | Linked to Parkinson's disease pathogenesis |
| ESCRT-0 | Recognizes ubiquitinated cargo | Initiates MVB sorting |
| ESCRT-I | Recruits ESCRT-II and initiates ILV formation | Essential for MVB biogenesis |
| ESCRT-II | Induces membrane curvature and recruits ESCRT-III | Critical for ILV formation |
| ESCRT-III | Mediates membrane scission to form ILVs | Key component of MVB sorting |
| VPS4 | ATPase that disassembles ESCRT-III | Regulates ESCRT recycling |
| RAB7 | Late endosome marker, regulates fusion with lysosome | Controls MVB transport and fusion |
| SNAREs | Mediate membrane fusion between MVB and lysosome | Essential for cargo delivery |
| Ubiquitin | Tags cargo for sorting into MVBs | Signals degradation |
| ALIX | Accessory protein in ESCRT-mediated sorting | Facilitates ILV formation |
| TSG101 | ESCRT-I subunit, binds ubiquitinated cargo | Involved in MVB sorting |
| HRS | ESCRT-0 subunit, recognizes ubiquitinated cargo | Critical for cargo selection |
| VPS36 | ESCRT-II subunit, binds ubiquitin and ESCRT-I | Links cargo recognition to ILV formation |
| VPS25 | ESCRT-II subunit, recruits ESCRT-III | Essential for MVB sorting |
How Is endosome to lysosome transport via multivesicular body sorting pathway Regulated?
The endosome to lysosome transport via MVB sorting pathway is regulated at multiple levels. ESCRT complex assembly and disassembly are controlled by ATP hydrolysis and post-translational modifications, such as ubiquitination and phosphorylation. RAB GTPases, including RAB31 and RAB7, cycle between active GTP-bound and inactive GDP-bound states to regulate vesicle formation and fusion. Additionally, calcium signaling and lipid composition influence MVB sorting and fusion with lysosomes. In disease contexts, proteins like ATP13A2/PARK9 modulate exosome secretion and alpha-synuclein clearance, impacting pathway activity. Exercise-induced beta2-adrenergic signaling upregulates CHMP4B, enhancing autophagy-lysosomal flux.
endosome to lysosome transport via multivesicular body sorting pathway and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| ATP6V1D | Hepatocellular carcinoma | Knockout in liver cancer cell lines |
| ATP13A2/PARK9 | Parkinson's disease | Knockout in neuronal cells |
| CHMP4B | Tauopathy | Overexpression in mouse models |
| RAB31 | Cancer metastasis | Knockdown in breast cancer cells |
| ESCRT-III | Lysosomal storage disorders | Point mutations in patient fibroblasts |
Cancer
Dysregulation of MVB sorting contributes to cancer by altering the degradation of oncoproteins and growth factor receptors. For example, ATP6V1D drives hepatocellular carcinoma stemness and progression through lysosome acidification-dependent and -independent mechanisms. RAB31-mediated exosome secretion can promote tumor microenvironment remodeling and metastasis. Targeting this pathway may offer therapeutic strategies for cancer treatment.
Neurodegeneration
Impaired MVB sorting leads to the accumulation of toxic proteins, such as alpha-synuclein, contributing to Parkinson's disease. ATP13A2/PARK9 regulates exosome secretion and alpha-synuclein clearance, and its dysfunction is linked to neurodegeneration. Enhancing autophagy-lysosomal flux via CHMP4B upregulation has been shown to attenuate deficits in tauopathy models. Thus, this pathway is a potential target for neurodegenerative disease therapies.
Lysosomal Storage Disorders
Defects in MVB sorting can cause lysosomal storage disorders by impairing the delivery of substrates to lysosomes. Mutations in ESCRT components or RAB GTPases disrupt cargo degradation, leading to substrate accumulation. Understanding these mechanisms may inform treatments for disorders like Niemann-Pick disease.
From endosome to lysosome transport via multivesicular body sorting pathway-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate MVB sorting? | CRISPR knockout in HeLa cells |
| What is the effect of a point mutation in gene Y? | CRISPR point mutation in iPSCs |
| How does tagged protein Z localize? | Knock-in of fluorescent tag in HEK293T |
| Can overexpression of gene W rescue phenotype? | Overexpression in patient fibroblasts |
| Which genes are essential for MVB sorting? | CRISPR library screening in cancer cells |
| What are the proteomic changes upon gene knockout? | Quantitative proteomics in KO cells |
How to Study the endosome to lysosome transport via multivesicular body sorting pathway Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Gene function loss | Identify essential MVB sorting genes |
| CRISPR knock-in | Protein localization and dynamics | Tag RAB31 to study exosome pathway |
| Point mutation | Effect of specific variants | Model disease-associated mutations |
| Overexpression | Gain-of-function and rescue | Test CHMP4B in tauopathy |
| Proteomics | Protein interactions and cargo | Map ESCRT complex components |
| Live-cell imaging | MVB dynamics and fusion | Visualize ILV formation |
| RNA-seq | Transcriptional changes | Assess pathway gene expression |
| CRISPR library screening | High-throughput gene function | Discover novel regulators |
CRISPR Knockout
CRISPR knockout is used to delete genes involved in MVB sorting to study their loss-of-function phenotypes. For example, knockout of ATP6V1D in hepatocellular carcinoma cells revealed its role in stemness and progression. This method helps identify essential components of the pathway.
CRISPR Knock-in and Point Mutation
Knock-in of tags or point mutations allows precise tracking and functional analysis of proteins. Tagged knock-in of RAB31 enabled visualization of its role in exosome pathways. Point mutations can mimic disease-associated variants, such as in ATP13A2/PARK9, to study their impact on exosome secretion.
Overexpression and Rescue
Overexpression of wild-type or mutant genes is used to assess gain-of-function and rescue effects. Overexpressing CHMP4B in tauopathy models attenuated autophagy-lysosomal deficits. This approach validates gene function and therapeutic potential.
Proteomics and Imaging
Quantitative proteomics identifies cargo and interactors of MVB sorting components, while imaging techniques like live-cell microscopy track MVB dynamics and fusion with lysosomes. These methods provide spatial and temporal insights into the pathway.
How CRISPR Can Be Used to Study GO:0032510 endosome to lysosome transport via multivesicular body sorting pathway
Knockout
CRISPR knockout generates cell lines with specific genes deleted to study their role in MVB sorting. For instance, knocking out ATP6V1D in liver cancer cells demonstrated its necessity for lysosome acidification and stemness. This approach is powerful for identifying essential pathway components and their contributions to disease.
Point Mutation
Point mutations introduced via CRISPR allow modeling of disease-associated variants. For example, mutating ATP13A2/PARK9 to mimic patient mutations can reveal defects in exosome secretion and alpha-synuclein clearance. This precision helps dissect molecular mechanisms and genotype-phenotype relationships.
Knock-in
Knock-in of reporter tags or conditional alleles enables real-time tracking and tissue-specific studies. Tagging RAB31 with fluorescent proteins clarified its role in ESCRT-independent exosome pathways. Knock-in models are invaluable for understanding protein dynamics in vivo.
Overexpression
Overexpression of wild-type or mutant genes via CRISPR activation or cDNA delivery tests gain-of-function effects. Overexpressing CHMP4B in tauopathy mice improved autophagy-lysosomal flux, highlighting therapeutic potential. This method complements loss-of-function studies.
How EDITGENE Supports endosome to lysosome transport via multivesicular body sorting pathway Research
Researchers studying endosome to lysosome transport via multivesicular body sorting pathway-related genes often need to determine whether a candidate gene is causally involved in the pathway and how its dysfunction contributes to disease. EDITGENE provides a comprehensive suite of CRISPR services to accelerate this research, from gene knockout to high-throughput screening and bioinformatics analysis.
Contact EDITGENE today to design your custom CRISPR model for endosome to lysosome transport via multivesicular body sorting pathway research.
Frequently Asked Questions About endosome to lysosome transport via multivesicular body sorting pathway
What is GO:0032510?
GO:0032510 is the Gene Ontology term for endosome to lysosome transport via multivesicular body sorting pathway, a biological process where substances are sorted into multivesicular bodies and then delivered to lysosomes for degradation.
What genes are involved in endosome to lysosome transport via multivesicular body sorting pathway?
Key genes include RAB31, ATP6V1D, CHMP4B, ATP13A2/PARK9, and ESCRT complex components such as TSG101, HRS, and VPS4.
How does the MVB sorting pathway work?
It involves ubiquitination of cargo, recognition by ESCRT complexes, formation of intraluminal vesicles, MVB maturation, and fusion with lysosomes for degradation.
What diseases are associated with defects in MVB sorting?
Defects are linked to cancer, neurodegeneration (e.g., Parkinson's disease), and lysosomal storage disorders.
What research methods are used to study GO:0032510?
Common methods include CRISPR knockout, knock-in, point mutation, overexpression, proteomics, imaging, and CRISPR library screening.
How does ATP13A2/PARK9 relate to MVB sorting?
ATP13A2/PARK9 regulates exosome secretion and alpha-synuclein clearance, impacting the MVB sorting pathway and Parkinson's disease pathogenesis.
Can CRISPR be used to study MVB sorting?
Yes, CRISPR knockout, knock-in, and point mutation models are widely used to dissect gene function in MVB sorting.
What is the role of ESCRT in MVB sorting?
ESCRT complexes recognize ubiquitinated cargo and mediate the formation of intraluminal vesicles within multivesicular bodies.
How does RAB31 function in this pathway?
RAB31 marks and controls an ESCRT-independent exosome pathway, regulating cargo sorting and secretion.
What is the significance of CHMP4B in MVB sorting?
CHMP4B is an ESCRT-III subunit that mediates membrane scission during ILV formation and is linked to autophagy-lysosomal flux.
Conclusion
The endosome to lysosome transport via multivesicular body sorting pathway (GO:0032510) is a critical cellular process for protein degradation and homeostasis. Its dysregulation contributes to cancer, neurodegeneration, and lysosomal storage disorders. Advances in CRISPR technology and other research methods continue to unravel the molecular mechanisms and identify therapeutic targets. EDITGENE offers comprehensive services to support researchers in dissecting this pathway and developing novel interventions.
References
- 1. Wei D et al.. 2021. RAB31 marks and controls an ESCRT-independent exosome pathway.. Cell Res 31(2):157-177 PMID: 32958903
- 2. Xu Z et al.. 2025. ATP6V1D drives hepatocellular carcinoma stemness and progression via both lysosome acidification-dependent and -independent mechanisms.. Autophagy 21(3):513-529 PMID: 39316516
- 3. Migliano SM et al.. 2018. ESCRT and Membrane Protein Ubiquitination.. Prog Mol Subcell Biol 57:107-135 PMID: 30097773
- 4. Toshima J et al.. 2026. Endocytosis and trans-Golgi Network in Yeast.. Subcell Biochem 110:335-358 PMID: 41240318
- 5. Bishop NE. 2003. Dynamics of endosomal sorting.. Int Rev Cytol 232:1-57 PMID: 14711115
- 7. Tsunemi T et al.. 2014. ATP13A2/PARK9 regulates secretion of exosomes and α-synuclein.. J Neurosci 34(46):15281-7 PMID: 25392495
- 8. Bi SG et al.. 2025. Aerobic Exercise Attenuates Autophagy-Lysosomal Flux Deficits via β2-AR-Mediated ESCRT-III Subunit CHMP4B in Mice With Human MAPT P301L.. Aging Cell 24(10):e70184 PMID: 40715737
