GO:7770052 endoplasmic reticulum-lysosome membrane contact site: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:7770052 describes an organelle membrane contact site formed between the endoplasmic reticulum (ER) membrane and the lysosomal membrane.
• These ER-lysosome contact sites are tethering platforms that bring the two organelles within close apposition without membrane fusion.
• VPS13C is a key tethering protein that localizes to ER-lysosome contacts and mediates their formation in neurons.
• ER-lysosome contact sites participate in neuronal stress responses and are linked to lysosomal positioning and function.
• Dysfunction of ER-lysosome tethering proteins such as VPS13C is associated with neurodegenerative disease biology.
• CRISPR knockout, knock-in, and tagged knock-in models are essential to dissect the function of contact-site proteins in cells.
Description
The endoplasmic reticulum-lysosome membrane contact site (GO:7770052) is a specialized cellular component where the ER membrane and the lysosomal membrane come into close apposition without fusing. These contact sites are emerging as critical signaling and trafficking hubs that allow the two organelles to exchange lipids, calcium, and other signals. Understanding their molecular architecture is essential for researchers studying organelle communication, lysosomal biology, and neuronal stress responses. Recent work has identified VPS13C as a central tethering protein that localizes to ER-lysosome contacts and is required for their formation in neurons. This article provides a research-grade overview of GO:7770052, covering its definition, structure, molecular mechanism, key genes, disease relevance, and the CRISPR-based methods used to study it.
endoplasmic reticulum-lysosome membrane contact site At A Glance
| GO ID | GO:7770052 |
|---|---|
| GO term | endoplasmic reticulum-lysosome membrane contact site |
| Ontology | cellular_component |
| Synonym | ER-lysosome contact site; ER-lysosome MCS; lysosome-ER membrane contact site |
| Major function | Tethering the ER and lysosome membranes to facilitate inter-organelle communication and neuronal stress responses |
| Key tethering protein | VPS13C |
| Cellular context | Neuronal cells and other cell types where ER-lysosome contacts are present |
| Disease relevance | Neurodegenerative disease biology linked to VPS13C dysfunction |
What Is GO:7770052?
GO:7770052 is defined as an organelle membrane contact site between the endoplasmic reticulum membrane and the lysosomal membrane. In other words, it is a zone where the ER and lysosome membranes are held in close proximity by tethering proteins, enabling inter-organelle communication without membrane fusion.
Why Is endoplasmic reticulum-lysosome membrane contact site Important in Cell Biology?
ER-lysosome membrane contact sites are important because they provide a physical platform for the ER and lysosome to communicate, which is essential for neuronal stress responses and overall cellular homeostasis. Disruption of these contacts, for example through loss of VPS13C, impairs the ability of neurons to respond to stress and is linked to neurodegenerative disease.
• ER-lysosome contact sites enable direct communication between the ER and lysosome without membrane fusion.
• They are required for proper neuronal stress responses.
• VPS13C acts as a tethering protein at these sites.
• Loss of ER-lysosome tethering is associated with neurodegenerative disease biology.
• These contact sites contribute to lysosomal positioning and function.
• They are a target for CRISPR-based functional studies of organelle communication.
• Understanding them may reveal new therapeutic targets for neurodegeneration.
• They represent a distinct cellular component that can be studied by imaging and proteomics.
What Happens During endoplasmic reticulum-lysosome membrane contact site?
Tethering and Contact Formation
In simple terms: The ER and lysosome are pulled close together by a protein tether.
The formation of an ER-lysosome membrane contact site begins when tethering proteins, such as VPS13C, localize between the ER and lysosomal membranes and hold them in close apposition. This tethering does not lead to membrane fusion but creates a stable contact zone that permits inter-organelle communication.
Neuronal Stress Response
In simple terms: When neurons are stressed, these contact sites help them cope.
In neurons, ER-lysosome contact sites mediated by VPS13C are involved in stress responses, suggesting that the contact site is a functional hub that helps neurons adapt to stress. Loss of VPS13C-mediated tethering impairs this response.
Lysosomal Positioning and Function
In simple terms: The contact sites help position lysosomes where they are needed.
ER-lysosome membrane contact sites contribute to the regulation of lysosomal positioning and function, which is critical for cellular degradation and signaling pathways.
Key Genes Involved in GO:7770052 endoplasmic reticulum-lysosome membrane contact site
The following genes and proteins are central to the structure and function of the endoplasmic reticulum-lysosome membrane contact site (GO:7770052).
| Gene | Major Role | Research Relevance |
|---|---|---|
| VPS13C | Tethering protein at ER-lysosome contacts; mediates contact formation in neurons | Key marker for studying ER-lysosome contact site assembly and neuronal stress responses |
| ER membrane proteins | Provide the ER side of the contact site | Candidate tethers and regulatory components |
| Lysosomal membrane proteins | Provide the lysosomal side of the contact site | Candidate tethers and regulatory components |
| VPS13 family members | Homologs that may share tethering functions | Comparative studies of contact site biology |
| Lipid transfer proteins | Potential mediators of lipid exchange at contacts | Functional studies of inter-organelle lipid trafficking |
| Calcium signaling proteins | May regulate contact site dynamics | Studies of calcium crosstalk between ER and lysosome |
| mTOR pathway components | Potential regulators of contact site function | Studies of nutrient sensing and contact site regulation |
| Autophagy-related proteins | May interact with contact sites during autophagy | Studies of autophagy-lysosome crosstalk |
| Membrane trafficking regulators | Control contact site dynamics | Studies of organelle positioning |
| Cytoskeletal adaptors | Link contact sites to cytoskeleton | Studies of lysosomal transport |
| ER-shaping proteins | Maintain ER structure for contact formation | Studies of ER morphology |
| Lysosomal ion channels | Regulate lysosomal membrane potential | Studies of contact site signaling |
| Phosphoinositide-modifying enzymes | Generate lipids that recruit tethers | Studies of membrane identity |
| Rab GTPases | Regulate membrane identity and tethering | Studies of contact site assembly |
| SNARE-associated proteins | May modulate contact site stability | Studies of membrane fusion machinery |
| Stress response kinases | Transduce stress signals at contacts | Studies of neuronal stress |
How Is endoplasmic reticulum-lysosome membrane contact site Regulated?
The regulation of ER-lysosome membrane contact sites is an emerging area, with evidence that VPS13C-mediated tethering is important for neuronal stress responses. Other regulatory inputs, such as nutrient signaling and calcium fluxes, are likely but require further study.
endoplasmic reticulum-lysosome membrane contact site and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| VPS13C | Neurodegeneration; impaired neuronal stress response | VPS13C knockout neurons |
| VPS13C | Lysosomal dysfunction | VPS13C point-mutation knock-in cells |
| ER-lysosome tethering complex | Organelle communication defects | Tagged knock-in for live imaging |
| Lysosomal membrane proteins | Lysosomal positioning defects | Overexpression and knockout models |
Neurodegeneration
Dysfunction of ER-lysosome membrane contact sites, particularly through loss of VPS13C, is linked to neurodegenerative disease biology, as VPS13C-mediated tethering is required for neuronal stress responses.
Lysosomal Storage and Trafficking Disorders
Because ER-lysosome contact sites regulate lysosomal positioning and function, their disruption may contribute to lysosomal trafficking disorders, although direct evidence is still limited.
From endoplasmic reticulum-lysosome membrane contact site-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of VPS13C in ER-lysosome tethering? | VPS13C knockout cell line |
| How does a disease-associated VPS13C mutation affect contact sites? | VPS13C point-mutation knock-in |
| Where exactly does VPS13C localize at contacts? | Endogenous VPS13C tagged knock-in |
| Does overexpression of VPS13C increase contact sites? | VPS13C overexpression cell line |
| What proteins co-localize with ER-lysosome contacts? | Proximity labeling with tagged knock-in |
| How do contact sites change under neuronal stress? | Stress-treated knockout and wild-type neurons |
How to Study the endoplasmic reticulum-lysosome membrane contact site Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell fluorescence microscopy | Number and dynamics of ER-lysosome contacts | Visualizing contact sites in knockout vs wild-type cells |
| Proximity labeling proteomics | Protein composition of contact sites | Identifying novel tethering proteins |
| CRISPR knockout | Loss-of-function effects on contact sites | Testing VPS13C requirement |
| CRISPR knock-in | Localization of tagged endogenous proteins | Tracking VPS13C at contacts |
| Co-immunoprecipitation | Physical interactions between ER and lysosomal proteins | Validating tethering complexes |
| Subcellular fractionation | Distribution of proteins across organelles | Confirming contact site enrichment |
| Transcriptomics (RNA-seq) | Gene expression changes upon contact site disruption | Identifying stress response pathways |
Imaging of Contact Sites
Fluorescence microscopy, including live-cell imaging with tagged knock-in proteins, is used to visualize ER-lysosome membrane contact sites and quantify their number and dynamics.
Proteomics and Proximity Labeling
Proximity-dependent biotinylation coupled with mass spectrometry can identify proteins enriched at ER-lysosome contacts, such as VPS13C and its interactors.
CRISPR Functional Genomics
CRISPR knockout and knock-in screens can systematically test the role of candidate genes in contact site formation and function.
Biochemical Fractionation
Subcellular fractionation and co-immunoprecipitation can confirm physical association between ER and lysosomal proteins at contact sites.
How CRISPR Can Be Used to Study GO:7770052 endoplasmic reticulum-lysosome membrane contact site
Knockout
CRISPR knockout of VPS13C or other candidate tethers is used to test whether the protein is required for ER-lysosome membrane contact site formation and neuronal stress responses.
Point Mutation
Point-mutation knock-in can model disease-associated variants of VPS13C to determine how specific amino acid changes affect contact site function.
Knock-in
Tagged knock-in of VPS13C allows visualization of endogenous protein at ER-lysosome contacts and enables proximity labeling to identify local proteomes.
Overexpression
Overexpression of VPS13C or other tethering proteins can be used to test whether increasing protein levels enhances contact site formation or alters lysosomal positioning.
How EDITGENE Supports endoplasmic reticulum-lysosome membrane contact site Research
Researchers studying endoplasmic reticulum-lysosome membrane contact site-related genes often need to determine whether a candidate gene is causally involved in contact site formation, neuronal stress responses, or disease. EDITGENE provides the CRISPR tools and services to build precisely engineered cell models for these questions.
Contact EDITGENE today to design your custom CRISPR model for endoplasmic reticulum-lysosome membrane contact site research.
Frequently Asked Questions About endoplasmic reticulum-lysosome membrane contact site
What is the endoplasmic reticulum-lysosome membrane contact site?
It is a cellular component where the ER membrane and lysosomal membrane are held in close apposition by tethering proteins, enabling communication without fusion.
What is GO:7770052?
GO:7770052 is the Gene Ontology identifier for the endoplasmic reticulum-lysosome membrane contact site.
What genes are involved in the endoplasmic reticulum-lysosome membrane contact site?
VPS13C is a key tethering protein, and other ER and lysosomal membrane proteins are also involved.
What is the function of VPS13C at ER-lysosome contacts?
VPS13C mediates tethering between the ER and lysosome and is required for neuronal stress responses.
How are ER-lysosome contact sites studied?
They are studied using live-cell imaging, proximity labeling proteomics, and CRISPR knockout or knock-in models.
Are ER-lysosome contact sites linked to disease?
Yes, dysfunction of VPS13C-mediated tethering is associated with neurodegenerative disease biology.
What is the difference between ER-lysosome contact sites and membrane fusion?
Contact sites bring membranes close together without fusion, whereas fusion merges membranes.
Can CRISPR be used to study ER-lysosome contact sites?
Yes, CRISPR knockout, point-mutation knock-in, tagged knock-in, and overexpression models are all used to dissect contact site biology.
What methods measure ER-lysosome contact sites?
Fluorescence microscopy, proximity labeling, co-immunoprecipitation, and subcellular fractionation are commonly used.
Why are ER-lysosome contact sites important in neurons?
They help neurons respond to stress, and their disruption is linked to neurodegeneration.
Conclusion
The endoplasmic reticulum-lysosome membrane contact site (GO:7770052) is a specialized cellular component that enables direct communication between the ER and lysosome. VPS13C-mediated tethering at these sites is critical for neuronal stress responses and is linked to neurodegenerative disease. CRISPR-based models, including knockout, point-mutation knock-in, tagged knock-in, and overexpression, are powerful tools for dissecting the molecular mechanisms of this contact site. Continued research into GO:7770052 will likely reveal new therapeutic targets for diseases associated with organelle communication defects.
References
- 1. Hamad RS et al.. 2026. VPS13C-mediated endoplasmic reticulum-lysosome tethering in neuronal stress responses.. Tissue Cell 103:103692 PMID: 42284733
