GO:1900102 negative regulation of endoplasmic reticulum unfolded protein response: ER Proteostasis Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1900102 describes any process that stops, prevents or reduces the endoplasmic reticulum unfolded protein response (UPR), a stress-signaling network that adjusts ER folding capacity.
• Negative regulation of the ER UPR is essential for restoring proteostasis after acute stress and for preventing the maladaptive, pro-apoptotic or pro-inflammatory consequences of chronic UPR activation.
• Key molecular brakes include ER-associated degradation (ERAD) components such as SEL1L-HRD1 and HRD1, which clear misfolded proteins and thereby reduce UPR triggering.
• Chaperone-like and ER-resident proteins such as GRINA, sigma-1 receptor and Bax Inhibitor-1 modulate UPR amplitude by controlling ATF6 stability, SERCA2 degradation and proinsulin misfolding.
• Dysregulated negative regulation of the ER UPR contributes to hepatic ischemia-reperfusion injury, osteoclastogenesis, innate immune imbalance, diabetes and cancer.
• CRISPR knockout, point-mutation, knock-in and overexpression models, combined with RNA-seq, proteomics and imaging, are the main tools for dissecting GO:1900102 mechanisms.
Description
The endoplasmic reticulum (ER) unfolded protein response (UPR) is a conserved signaling network that senses misfolded protein accumulation in the ER lumen and adjusts translation, chaperone expression and degradation capacity to restore proteostasis. GO:1900102, negative regulation of endoplasmic reticulum unfolded protein response, refers to any process that stops, prevents or reduces the frequency, rate or extent of this UPR. Because unrestrained UPR signaling can drive apoptosis, inflammation and metabolic dysfunction, negative regulation of the ER UPR is now recognized as a distinct and therapeutically relevant biological process. Mechanistically, negative regulation of the ER UPR is often achieved by enhancing ER-associated degradation (ERAD), which removes misfolded proteins before they can sustain UPR activation. For example, GRINA promotes HRD1-mediated ATF6 ubiquitination and degradation, thereby limiting ER-phagy and apoptosis during hepatic ischemia-reperfusion injury. Similarly, the SEL1L-HRD1 ERAD complex restricts the activable STING pool and dampens STING-mediated innate immune signaling, illustrating how ERAD-dependent negative regulation of the UPR intersects with immunity. Beyond ERAD, dedicated modulators such as the sigma-1 receptor and Bax Inhibitor-1 tune UPR amplitude by controlling calcium handling, proinsulin misfolding and programmed cell death. In hematopoietic stem cells, UPR regulation is tightly linked to stem cell maintenance and differentiation, underscoring the physiological importance of negative regulation. This article integrates QuickGO annotation for GO:1900102 with verified PubMed literature to summarize the definition, mechanisms, key genes, disease links and research methods for this process.
negative regulation of endoplasmic reticulum unfolded protein response At A Glance
| GO ID | GO:1900102 |
|---|---|
| GO term | negative regulation of endoplasmic reticulum unfolded protein response |
| Ontology | biological_process |
| Synonym | negative regulation of ER unfolded protein response; inhibition of erUPR; downregulation of SREBP-mediated signalling pathway |
| Major function | Dampening ER UPR signaling to restore proteostasis and prevent maladaptive stress responses |
| Related process | ER-associated degradation (ERAD), ER-phagy, reticulophagy, calcium homeostasis |
| Key regulators | HRD1, SEL1L, ATF6, GRINA, sigma-1 receptor, Bax Inhibitor-1, GSTK1, RETREG1/FAM134B |
| Disease relevance | Hepatic ischemia-reperfusion injury, osteoclastogenesis, innate immunity, diabetic nephropathy, pancreatic beta-cell dysfunction, cancer |
| Research methods | CRISPR KO/point mutation/knock-in/overexpression, RNA-seq, proteomics, imaging, ER stress reporters |
What Is GO:1900102?
GO:1900102 is a biological_process term defined as any process that stops, prevents or reduces the frequency, rate or extent of the endoplasmic reticulum unfolded protein response. In practical terms, it covers molecular events that dampen ER stress signaling, including enhanced ERAD-mediated clearance of misfolded proteins, degradation of UPR transcription factors such as ATF6, and modulation of ER calcium and redox homeostasis.
Why Is negative regulation of endoplasmic reticulum unfolded protein response Important in Cell Biology?
Negative regulation of the ER UPR is critical because the UPR is a double-edged sword: acute activation protects cells, whereas chronic or unresolved activation promotes apoptosis, inflammation and metabolic disease. Understanding GO:1900102 provides mechanistic insight into how cells terminate UPR signaling, how ERAD and ER-phagy contribute to this termination, and how failure of these brakes contributes to human pathology such as hepatic ischemia-reperfusion injury, osteoclastogenesis, innate immune imbalance, diabetic nephropathy and cancer.
• Prevents maladaptive, pro-apoptotic UPR signaling after acute ER stress.
• Enhances ERAD-mediated clearance of misfolded proteins, reducing UPR triggering.
• Modulates innate immunity by limiting the activable STING pool through SEL1L-HRD1.
• Controls osteoclastogenesis via sigma-1 receptor-mediated ERAD of SERCA2.
• Protects pancreatic beta cells by limiting proinsulin misfolding and programmed cell death.
• Attenuates tubular injury in diabetic nephropathy through reticulophagy and reduced ER stress.
• Suppresses cuproptosis via glycolysis reprogramming in lung adenocarcinoma.
• Regulates hematopoietic stem cell maintenance and differentiation.
• Provides therapeutic targets for ischemia-reperfusion injury, diabetes and cancer.
• Offers a rich set of CRISPR-editable nodes for functional genomics and drug discovery.
What Happens During negative regulation of endoplasmic reticulum unfolded protein response?
Sensing and attenuation of ER stress
In simple terms: Cells first detect misfolded proteins in the ER, then apply brakes to the stress alarm.
The ER UPR is initiated when misfolded proteins accumulate and sequester BiP/GRP78, activating PERK, IRE1 and ATF6. Negative regulation of the ER UPR begins with attenuation of these sensors, often through enhanced folding capacity or removal of the triggering misfolded proteins. Regulated translation initiation is a key node: phosphorylation of eIF2alpha by PERK reduces global translation while allowing selective translation of stress-responsive mRNAs, and its reversal contributes to UPR termination.
ERAD-mediated clearance of misfolded proteins
In simple terms: The cell tags and destroys misfolded proteins so the stress signal fades.
ER-associated degradation (ERAD) is a major mechanism for negative regulation of the ER UPR. The SEL1L-HRD1 complex recognizes misfolded ER proteins, retrotranslocates them to the cytosol and targets them for proteasomal degradation. GRINA enhances HRD1-mediated ATF6 ubiquitination, reducing ATF6 availability and thereby dampening UPR transcriptional output during hepatic ischemia-reperfusion injury. Sigma-1 receptor promotes ERAD of SERCA2, linking calcium handling to UPR attenuation in osteoclastogenesis.
ER-phagy and reticulophagy
In simple terms: Cells can also digest parts of the ER itself to lower stress.
Selective autophagy of the ER, termed reticulophagy or ER-phagy, contributes to negative regulation of the ER UPR by removing damaged ER segments and reducing the load of misfolded proteins. GSTK1 and RETREG1/FAM134B-mediated reticulophagy attenuates tubular injury in diabetic nephropathy through reduction of ER stress and apoptosis. GRINA alleviates ER-phagy and apoptosis by enhancing HRD1-mediated ATF6 ubiquitination, indicating crosstalk between ERAD and ER-phagy in UPR negative regulation.
Chaperone and calcium-dependent modulation
In simple terms: Helper proteins and calcium signals fine-tune how loud the stress alarm gets.
ER-resident chaperones and calcium regulators modulate UPR amplitude. Bax Inhibitor-1 preserves pancreatic beta-cell proteostasis by limiting proinsulin misfolding and programmed cell death, effectively reducing UPR activation. Sigma-1 receptor influences ER calcium and ERAD of SERCA2, which in turn affects UPR signaling in osteoclasts. These examples show that negative regulation of the ER UPR is not a single event but a network of chaperone, calcium and degradation activities.
Transcriptional and metabolic feedback
In simple terms: Long-term adjustments in gene expression and metabolism help switch the stress response off.
Chronic UPR activation is opposed by transcriptional and metabolic feedback. ER stress-related super-enhancers suppress cuproptosis via glycolysis reprogramming in lung adenocarcinoma, illustrating how ER stress-related transcriptional programs can reshape metabolism and cell death. In hematopoietic stem cells, UPR regulation is integrated with differentiation and self-renewal programs, highlighting cell-type-specific negative regulation. Together, these mechanisms ensure that UPR signaling is transient and context-appropriate.
Key Genes Involved in GO:1900102 negative regulation of endoplasmic reticulum unfolded protein response
The following genes and proteins are experimentally implicated in negative regulation of the ER UPR, based on the verified literature cited in this article.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HRD1 (SYVN1) | E3 ubiquitin ligase mediating ERAD of misfolded proteins and ATF6 | Core ERAD effector; target for KO and point-mutation studies |
| SEL1L | Adaptor of the SEL1L-HRD1 ERAD complex | Controls STING pool size and innate immunity; KO models available |
| ATF6 | UPR transcription factor degraded via HRD1-mediated ubiquitination | Substrate of negative regulation; knock-in tagging for stability studies |
| GRINA | Enhances HRD1-mediated ATF6 ubiquitination and limits ER-phagy | Protective factor in hepatic ischemia-reperfusion injury |
| Sigma-1 receptor (SIGMAR1) | Promotes ERAD of SERCA2 and modulates calcium | Regulates osteoclastogenesis; KO and overexpression models |
| SERCA2 (ATP2A2) | Calcium pump whose ERAD affects UPR amplitude | Substrate of sigma-1 receptor-mediated ERAD |
| Bax Inhibitor-1 (TMBIM6) | Limits proinsulin misfolding and programmed cell death | Beta-cell proteostasis; KO and knock-in models |
| GSTK1 | Participates in reticulophagy and ER stress reduction | Diabetic nephropathy models; KO and overexpression |
| RETREG1/FAM134B | ER-phagy receptor mediating reticulophagy | Tubular injury and ER stress; KO and tagged knock-in |
| STING (TMEM173) | Innate immune adaptor whose pool is limited by SEL1L-HRD1 | Immunity and ERAD crosstalk; KO models |
| PERK (EIF2AK3) | ER stress sensor kinase phosphorylating eIF2alpha | Translation control and UPR attenuation |
| eIF2alpha (EIF2S1) | Translation initiation factor regulated by PERK | Regulated translation initiation during stress |
| BiP/GRP78 (HSPA5) | ER chaperone sequestering UPR sensors | Chaperone-mediated UPR modulation |
| IRE1 (ERN1) | ER stress sensor with endoribonuclease activity | UPR signaling and attenuation |
| XBP1 | Transcription factor downstream of IRE1 | UPR transcriptional output and feedback |
| Hematopoietic stem cell markers (e.g., HSC compartment) | UPR regulation in stem cell maintenance | Stem cell biology and differentiation |
| Glycolysis enzymes (e.g., HK2, PKM) | Metabolic reprogramming linked to ER stress super-enhancers | Cancer metabolism and cuproptosis |
| Cuproptosis regulators (e.g., FDX1, DLAT) | Cell death pathway suppressed by ER stress-related super-enhancers | Lung adenocarcinoma models |
How Is negative regulation of endoplasmic reticulum unfolded protein response Regulated?
Negative regulation of the ER UPR is itself regulated at multiple levels. PERK-mediated eIF2alpha phosphorylation controls translation initiation and its reversal contributes to UPR attenuation. ERAD activity, determined by SEL1L-HRD1 levels and substrate availability, sets the threshold for UPR termination. GRINA enhances HRD1-mediated ATF6 ubiquitination, providing a direct brake on ATF6-dependent transcription. Sigma-1 receptor and Bax Inhibitor-1 modulate calcium and proinsulin folding, respectively, thereby influencing UPR amplitude. In cancer, ER stress-related super-enhancers reprogram glycolysis and suppress cuproptosis, illustrating metabolic feedback on ER stress responses. In hematopoietic stem cells, UPR regulation is coupled to differentiation state.
negative regulation of endoplasmic reticulum unfolded protein response and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| GRINA | Hepatic ischemia-reperfusion injury | Liver-specific KO and overexpression in mouse IRI models |
| SEL1L | STING-mediated innate immunity | SEL1L KO macrophages and STING reporter assays |
| SIGMAR1 | Osteoclastogenesis and bone loss | Sigma-1 receptor KO osteoclast cultures |
| GSTK1 / RETREG1 | Diabetic nephropathy | Tubular-specific KO and reticulophagy reporters |
| TMBIM6 (Bax Inhibitor-1) | Pancreatic beta-cell dysfunction | Beta-cell-specific KO and proinsulin folding assays |
Hepatic ischemia-reperfusion injury
GRINA alleviates hepatic ischemia-reperfusion injury-induced apoptosis and ER-phagy by enhancing HRD1-mediated ATF6 ubiquitination, demonstrating that negative regulation of the ER UPR is protective in this setting. Loss of this brake would be expected to increase ATF6 activity, ER-phagy and apoptosis.
Bone and metabolic disease
Sigma-1 receptor attenuates osteoclastogenesis by promoting ER-associated degradation of SERCA2, linking negative regulation of the ER UPR to bone remodeling. In diabetic nephropathy, GSTK1 and RETREG1/FAM134B-mediated reticulophagy attenuates tubular injury through reduction of ER stress and apoptosis. Bax Inhibitor-1 preserves pancreatic beta-cell proteostasis by limiting proinsulin misfolding and programmed cell death, connecting UPR negative regulation to diabetes.
Cancer and innate immunity
ER stress-related super-enhancers suppress cuproptosis via glycolysis reprogramming in lung adenocarcinoma, showing how ER stress programs can reshape cancer cell death. SEL1L-HRD1 ERAD controls STING-mediated innate immunity by limiting the size of the activable STING pool, indicating that negative regulation of the ER UPR intersects with immune signaling. In hematopoietic stem cells, UPR regulation influences stem cell behavior relevant to hematologic disease.
From negative regulation of endoplasmic reticulum unfolded protein response-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of HRD1 enhance ER UPR signaling? | HRD1/SYVN1 knockout cell lines with UPR reporters |
| Does GRINA-mediated ATF6 ubiquitination require a specific lysine? | ATF6 point-mutation knock-in cells |
| How does SEL1L-HRD1 control STING pool size? | SEL1L knockout with tagged STING knock-in |
| Does sigma-1 receptor regulate SERCA2 ERAD? | SIGMAR1 knockout and SERCA2 overexpression |
| Does reticulophagy attenuate diabetic tubular injury? | GSTK1 or RETREG1 knockout in tubular cells |
| Does Bax Inhibitor-1 limit proinsulin misfolding? | TMBIM6 knockout beta cells with proinsulin reporters |
How to Study the negative regulation of endoplasmic reticulum unfolded protein response Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcriptional changes in UPR and ERAD genes | KO vs wild-type comparisons |
| Ribo-seq | Translation efficiency and regulated initiation | eIF2alpha-dependent UPR attenuation |
| Proteomics | Protein stability and interactome of UPR regulators | ATF6 and SERCA2 degradation |
| Ubiquitination assays | E3 ligase-dependent substrate modification | HRD1-mediated ATF6 ubiquitination |
| ER stress reporters | Real-time UPR activity | Live-cell imaging of negative regulation |
| ER-phagy/reticulophagy reporters | Selective autophagy of ER | GSTK1/RETREG1 studies |
| Proinsulin folding assays | Beta-cell proteostasis | Bax Inhibitor-1 function |
| STING reporter assays | Innate immune activation | SEL1L-HRD1 ERAD studies |
Transcriptomic and translatomic profiling
RNA-seq and Ribo-seq can quantify UPR target genes and translation efficiency changes upon manipulation of negative regulators such as HRD1, GRINA or SEL1L. Regulated translation initiation is a key readout, and eIF2alpha phosphorylation status can be monitored to assess UPR attenuation.
Proteomics and degradation assays
Proteomics and cycloheximide chase assays measure stability of UPR effectors such as ATF6 and SERCA2, revealing ERAD-mediated negative regulation. Ubiquitination assays and proteasome inhibitors help confirm HRD1-dependent degradation events.
Imaging and reporter systems
Fluorescent ER stress reporters, ER-phagy reporters and live-cell imaging visualize UPR dynamics and reticulophagy in real time. Co-localization of ER markers with autophagosomes confirms reticulophagy activation.
Functional rescue and epistasis
Rescue experiments using wild-type versus mutant constructs, combined with CRISPR knockout backgrounds, establish causality and epistasis among HRD1, GRINA, ATF6 and downstream UPR genes.
How CRISPR Can Be Used to Study GO:1900102 negative regulation of endoplasmic reticulum unfolded protein response
Knockout
CRISPR knockout of HRD1, SEL1L, GRINA, SIGMAR1, GSTK1, RETREG1 or TMBIM6 removes negative regulators of the ER UPR and reveals their contribution to UPR amplitude, ERAD, reticulophagy and cell death. Knockout models are essential for epistasis experiments and for validating drug targets.
Point Mutation
Point-mutation knock-in of specific lysines or catalytic residues in ATF6, HRD1 or SERCA2 can dissect which residues are required for ubiquitination, ERAD and UPR attenuation. Such models distinguish scaffolding from catalytic functions.
Knock-in
Tagged knock-in of ATF6, STING or SERCA2 with fluorescent or epitope tags enables real-time tracking of stability, localization and degradation in response to negative regulation of the ER UPR. Knock-in reporters also allow precise measurement of ER-phagy flux.
Overexpression
Overexpression of GRINA, Bax Inhibitor-1 or sigma-1 receptor can enhance negative regulation of the ER UPR and protect cells from ER stress-induced apoptosis, providing gain-of-function evidence. Overexpression models are useful for testing therapeutic hypotheses in hepatic, bone and metabolic disease.
How EDITGENE Supports negative regulation of endoplasmic reticulum unfolded protein response Research
Researchers studying negative regulation of endoplasmic reticulum unfolded protein response-related genes often need to determine whether a candidate gene is causally involved in UPR attenuation, ERAD, reticulophagy or disease phenotypes. EDITGENE provides publication-ready CRISPR cell models and bioinformatics support to accelerate this work.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of endoplasmic reticulum unfolded protein response research.
Frequently Asked Questions About negative regulation of endoplasmic reticulum unfolded protein response
What is GO:1900102?
GO:1900102 is the Gene Ontology term for negative regulation of endoplasmic reticulum unfolded protein response, defined as any process that stops, prevents or reduces the frequency, rate or extent of the ER UPR.
What genes are involved in negative regulation of the ER UPR?
Key genes include HRD1 (SYVN1), SEL1L, ATF6, GRINA, SIGMAR1, SERCA2, TMBIM6, GSTK1 and RETREG1/FAM134B, based on published studies.
How does ERAD contribute to negative regulation of the ER UPR?
ERAD removes misfolded ER proteins; SEL1L-HRD1 recognizes and retrotranslocates them for proteasomal degradation, reducing UPR triggering. GRINA enhances HRD1-mediated ATF6 ubiquitination to dampen UPR output.
What is the role of GRINA in ER stress?
GRINA alleviates hepatic ischemia-reperfusion injury-induced apoptosis and ER-phagy by enhancing HRD1-mediated ATF6 ubiquitination.
How does sigma-1 receptor affect the UPR?
Sigma-1 receptor attenuates osteoclastogenesis by promoting ER-associated degradation of SERCA2, thereby modulating ER calcium and UPR signaling.
Can CRISPR knockout be used to study GO:1900102?
Yes, CRISPR knockout of HRD1, SEL1L, GRINA, SIGMAR1, GSTK1, RETREG1 or TMBIM6 removes negative regulators and reveals their impact on UPR amplitude and disease phenotypes.
What diseases are linked to negative regulation of the ER UPR?
Hepatic ischemia-reperfusion injury, osteoclastogenesis, innate immune imbalance, diabetic nephropathy, pancreatic beta-cell dysfunction and lung adenocarcinoma have been linked to this process.
How is reticulophagy related to ER UPR negative regulation?
GSTK1 and RETREG1/FAM134B-mediated reticulophagy attenuates tubular injury in diabetic nephropathy through reduction of ER stress and apoptosis.
What methods are used to study negative regulation of the ER UPR?
RNA-seq, Ribo-seq, proteomics, ubiquitination assays, ER stress reporters, ER-phagy reporters and STING reporter assays are commonly used.
Why is negative regulation of the ER UPR important for cancer?
ER stress-related super-enhancers suppress cuproptosis via glycolysis reprogramming in lung adenocarcinoma, showing that ER stress programs can reshape cancer cell death.
Conclusion
GO:1900102, negative regulation of endoplasmic reticulum unfolded protein response, is a biologically and clinically important process that terminates or dampens ER stress signaling through ERAD, ER-phagy, chaperone and calcium-dependent mechanisms. Its dysregulation is implicated in hepatic ischemia-reperfusion injury, bone disease, innate immunity, diabetic nephropathy, beta-cell dysfunction and cancer. CRISPR-based knockout, point-mutation, knock-in and overexpression models, combined with multi-omics and imaging, provide a robust toolkit for dissecting this process and identifying therapeutic targets.
References
- 1. Yu H et al.. 2025. GRINA alleviates hepatic ischemia‒reperfusion injury-induced apoptosis and ER-phagy by enhancing HRD1-mediated ATF6 ubiquitination.. J Hepatol 83(1):131-145 PMID: 39855351
- 2. Harding HP et al.. 2000. Regulated translation initiation controls stress-induced gene expression in mammalian cells.. Mol Cell 6(5):1099-108 PMID: 11106749
- 3. Wei X et al.. 2022. Sigma-1 receptor attenuates osteoclastogenesis by promoting ER-associated degradation of SERCA2.. EMBO Mol Med 14(7):e15373 PMID: 35611810
- 4. Ji Y et al.. 2023. SEL1L-HRD1 endoplasmic reticulum-associated degradation controls STING-mediated innate immunity by limiting the size of the activable STING pool.. Nat Cell Biol 25(5):726-739 PMID: 37142791
- 5. Gu Y et al.. 2025. Endoplasmic reticulum stress related super-enhancers suppress cuproptosis via glycolysis reprogramming in lung adenocarcinoma.. Cell Death Dis 16(1):316 PMID: 40253387
- 6. Sigurdsson V et al.. 2018. Regulation of unfolded protein response in hematopoietic stem cells.. Int J Hematol 107(6):627-633 PMID: 29725845
- 7. Zhang S et al.. 2025. GSTK1 and RETREG1/FAM134B-mediated reticulophagy attenuates tubular injury in diabetic nephropathy through endoplasmic reticulum stress and apoptosis.. Autophagy 21(12):2826-2841 PMID: 40778749
- 8. Blanc M et al.. 2024. Bax Inhibitor-1 preserves pancreatic β-cell proteostasis by limiting proinsulin misfolding and programmed cell death.. Cell Death Dis 15(5):334 PMID: 38744890
