GO:0070765 gamma-secretase complex: Components, Assembly and Research Methods, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0070765 (gamma-secretase complex) is a cellular_component term describing an aspartic-type intramembrane protease complex with a core of PSEN1 or PSEN2, APH1, NCT and PSENEN.
• The complex cleaves type I transmembrane substrates such as Notch and amyloid-beta precursor protein (APP) within the membrane, a process called regulated intramembrane proteolysis.
• Different subunit variants (e.g., APH1A vs APH1B, PSEN1 vs PSEN2) differ in localization, substrate preference and inhibitor sensitivity.
• Gamma-secretase is central to Alzheimer's disease biology because it generates amyloid-beta peptides from APP.
• Beyond neurodegeneration, gamma-secretase subunits are implicated in cancer progression, including breast cancer, and in inflammatory skin disease.
• CRISPR knockout, point-mutation, knock-in and overexpression models are key tools for dissecting subunit-specific functions of the complex.
Description
The gamma-secretase complex (GO:0070765) is a multi-subunit aspartic-type intramembrane protease that executes regulated intramembrane proteolysis of type I transmembrane proteins. It is defined by a core complex containing a presenilin catalytic subunit (PSEN1 or PSEN2), APH1, nicastrin (NCT) and presenilin enhancer (PSENEN/PEN-2). Because it cleaves substrates such as Notch and amyloid-beta precursor protein (APP) within the lipid bilayer, the complex sits at the intersection of developmental signaling and neurodegenerative disease. Researchers study GO:0070765 to understand how membrane-embedded proteolysis is controlled, how subunit composition dictates substrate selection, and how its dysfunction contributes to Alzheimer's disease and cancer. The complex is also a validated drug target, with selective inhibitors and modulators being developed to discriminate between PSEN1- and PSEN2-containing variants. In this article we summarize the authoritative QuickGO definition, the core subunits and assembly steps, the catalytic mechanism, disease links, and the CRISPR-based research methods used to interrogate gamma-secretase biology.
gamma-secretase complex At A Glance
| GO ID | GO:0070765 |
|---|---|
| GO term | gamma-secretase complex |
| Ontology | cellular_component |
| Synonym | presenilin complex; PS1 complex; PS2 complex; CD147-gamma-secretase complex (APH-1a, PS-1, PEN-2, NCT variant) |
| Major function | Aspartic-type endopeptidase activity that cleaves type I transmembrane substrates such as Notch and APP via intramembrane proteolysis |
| Core subunits | PSEN1 or PSEN2 (catalytic), APH1, NCT, PSENEN/PEN-2 |
| Regulatory subunits | gSAP, TMP1/TMED10, CD147/basigin |
| Substrate examples | Notch, amyloid-beta precursor protein (APP) |
| Subcellular context | Membrane-embedded complex; variants differ in localization |
What Is GO:0070765?
According to the QuickGO definition, GO:0070765 (gamma-secretase complex) is a protein complex with aspartic-type endopeptidase activity that contains a presenilin catalytic subunit (PSEN1 or PSEN2), an APH1 subunit, nicastrin (NCT) and presenilin enhancer (PEN-2/PSENEN) as the core complex. Variants of the complex with different subunit compositions differ in localization and substrate specificity, and additional regulatory subunits such as gamma-secretase-activating protein (gSAP), TMP1/TMED10 and CD147/basigin can associate with the four core subunits. The complex cleaves type I transmembrane substrates, including the cell surface receptor Notch and amyloid-beta precursor protein.
Why Is gamma-secretase complex Important in Cell Biology?
GO:0070765 is important because gamma-secretase is one of the best-characterized intramembrane proteases and a central node in both developmental signaling and neurodegeneration. Its cleavage of APP produces amyloid-beta peptides, the principal component of amyloid plaques in Alzheimer's disease, making the complex a major therapeutic target. At the same time, its cleavage of Notch controls cell-fate decisions, and dysregulated gamma-secretase activity has been linked to cancer progression, including breast cancer. The existence of subunit variants with distinct localization and substrate preferences means that the complex cannot be treated as a single entity; selective inhibitors of PSEN1-containing complexes illustrate the need for subunit-resolved research. Consequently, precise genetic models of each subunit are essential for understanding disease mechanisms and for developing safer therapeutics.
• Generates amyloid-beta peptides from APP, directly linking the complex to Alzheimer's disease pathogenesis.
• Mediates Notch signaling, a pathway controlling cell fate, proliferation and differentiation.
• Subunit variants (APH1A/APH1B, PSEN1/PSEN2) differ in localization and substrate specificity, complicating drug design.
• Implicated in cancer progression, including breast cancer, through effects on proliferation and signaling.
• Associated with inflammatory skin disease pathogenesis such as hidradenitis suppurativa.
• Conserved across evolution, with evidence of intramembrane proteolysis regulation even in Entamoeba histolytica.
• Selective inhibitors of PSEN1-gamma-secretase demonstrate the feasibility of subunit-targeted pharmacology.
• Serves as a paradigm for understanding intramembrane proteolysis and membrane protein complex assembly.
Structure and Composition of gamma-secretase complex
Core subunit architecture
In simple terms: Gamma-secretase is built from four essential protein parts that together form a working enzyme.
The core gamma-secretase complex consists of four subunits: presenilin (PSEN1 or PSEN2), which provides the catalytic aspartate residues; nicastrin (NCT); APH1; and presenilin enhancer (PSENEN/PEN-2). Presenilin undergoes endoproteolytic processing into an N-terminal and a C-terminal fragment, which together form the catalytic core. NCT is a type I transmembrane glycoprotein that may function in substrate recognition, while APH1 and PSENEN are required for complex stability and maturation. The QuickGO definition explicitly states that the core complex contains a presenilin catalytic subunit, an APH1 subunit, nicastrin and presenilin enhancer.
Subunit variants and regulatory subunits
In simple terms: Different versions of the complex exist depending on which subunit variants are used and which extra proteins attach to it.
Variants of the complex with different subunit compositions differ in localization and specific substrates. For example, APH1A and APH1B are distinct genes, and PSEN1 versus PSEN2 can be incorporated, yielding complexes with different properties. In addition to the four core subunits, regulatory subunits such as gamma-secretase-activating protein (gSAP), TMP1 (TMED10) and CD147 antigen (basigin) can associate with the core complex. These auxiliary subunits can modulate complex assembly, trafficking or activity, and their presence defines additional gamma-secretase variants listed as synonyms of GO:0070765.
Assembly and maturation
In simple terms: The four core proteins must come together in the right order and location to make an active enzyme.
Assembly of the gamma-secretase complex is a tightly regulated process that begins in the endoplasmic reticulum and continues through the secretory pathway. Nicastrin and APH1 are thought to stabilize presenilin and facilitate its endoproteolytic cleavage, while PSENEN/PEN-2 is required for presenilin maturation and activation. Only properly assembled complexes reach the cell surface and endosomal compartments where they encounter substrates. Disruption of any core subunit typically impairs complex formation and reduces gamma-secretase activity, underscoring the obligate nature of the four-subunit core.
Subcellular localization
In simple terms: Where the complex sits in the cell affects which proteins it can cut.
Gamma-secretase localizes to multiple membrane compartments, including the plasma membrane, endosomes, and the endoplasmic reticulum. Different subunit variants show distinct localization patterns, which contributes to substrate selectivity. For instance, complexes containing different APH1 isoforms may traffic differently, influencing access to substrates such as Notch or APP. This spatial regulation is a key determinant of gamma-secretase function in both physiological and pathological contexts.
Key Genes Involved in GO:0070765 gamma-secretase complex
The following genes encode the core and regulatory subunits of the gamma-secretase complex (GO:0070765) and are central to its assembly, catalysis and regulation.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PSEN1 | Catalytic subunit of gamma-secretase; contains two aspartate residues essential for intramembrane proteolysis | Mutations cause familial Alzheimer's disease; target for selective inhibitors |
| PSEN2 | Alternative catalytic subunit; forms complexes with distinct properties | Mutations linked to familial Alzheimer's disease; less studied than PSEN1 |
| NCSTN | Nicastrin; required for complex stability and substrate recognition | Knockout abolishes gamma-secretase activity; implicated in acne inversa |
| APH1A | Core subunit; stabilizes presenilin and contributes to complex assembly | Isoform-specific functions in substrate selection |
| APH1B | Alternative APH1 subunit; defines distinct complex variants | May influence substrate specificity and localization |
| PSENEN | Presenilin enhancer (PEN-2); required for presenilin maturation and activation | Essential for complex activity; knockout models lack gamma-secretase function |
| APP | Substrate of gamma-secretase; cleaved to produce amyloid-beta peptides | Central to Alzheimer's disease research; knock-in models of familial mutations |
| NOTCH1 | Substrate of gamma-secretase; cleaved to release Notch intracellular domain | Key for developmental signaling and cancer studies |
| GSAP | Gamma-secretase-activating protein; regulatory subunit | Modulates gamma-secretase activity; potential drug target |
| TMED10 | TMP1; regulatory subunit of the complex | Influences complex trafficking and activity |
| BSG | CD147/basigin; regulatory subunit of the complex | Modulates gamma-secretase in specific contexts |
| PSEN1 (mutants) | Pathogenic variants affecting cleavage specificity | Modeled by knock-in and point-mutation CRISPR approaches |
| PSEN2 (mutants) | Pathogenic variants linked to Alzheimer's disease | Less common but important for familial cases |
| NCSTN (mutants) | Variants affecting complex assembly | Studied in hidradenitis suppurativa and cancer |
| APH1A (isoforms) | Splice variants with different functions | Isoform-specific knockout models |
| PSENEN (mutants) | Variants impairing complex maturation | Used to dissect assembly steps |
How Is gamma-secretase complex Regulated?
Gamma-secretase activity is regulated at multiple levels, including subunit gene expression, complex assembly, trafficking, and post-translational modifications. The presence of regulatory subunits such as gSAP, TMED10 and CD147/basigin can modulate complex activity and substrate selection. Additionally, different subunit variants (e.g., APH1A vs APH1B, PSEN1 vs PSEN2) confer distinct localization and substrate preferences, effectively creating regulated subpopulations of the complex. Selective inhibitors of PSEN1-containing complexes demonstrate that pharmacological regulation can be subunit-specific. While upstream signaling pathways such as mTOR or the integrated stress response are not explicitly described in the provided QuickGO definition or verified citations for this complex, general principles of membrane protein quality control and trafficking apply.
gamma-secretase complex and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PSEN1 | Alzheimer's disease; altered APP cleavage | Knock-in of familial mutations; point-mutation models |
| PSEN2 | Familial Alzheimer's disease | Knock-in and knockout models |
| NCSTN | Hidradenitis suppurativa; cancer | Knockout in keratinocytes or cancer cell lines |
| APH1A/B | Substrate specificity in cancer and neurodegeneration | Isoform-specific knockout and overexpression |
| PSENEN | Complex assembly defects; skin disease | Knockout and point-mutation models |
Alzheimer's disease
Gamma-secretase is directly implicated in Alzheimer's disease because it cleaves APP to generate amyloid-beta peptides, which aggregate into plaques. Mutations in PSEN1 and PSEN2, the catalytic subunits of the complex, cause early-onset familial Alzheimer's disease by altering APP processing. The complex is therefore a major therapeutic target, although broad inhibition has been limited by toxicity due to Notch cleavage. Selective inhibitors of PSEN1-gamma-secretase are being explored to reduce amyloid-beta production while sparing Notch signaling.
Cancer
Gamma-secretase subunits, particularly PSEN1 and NCSTN, have been linked to cancer progression, including breast cancer. The complex regulates Notch signaling, which controls cell proliferation, differentiation and survival, and dysregulated Notch activity is oncogenic in several tissues. Targeting gamma-secretase is considered a potential therapeutic strategy in cancers with aberrant Notch activation, though challenges remain due to broad effects on normal tissues.
Inflammatory skin disease
Mutations in gamma-secretase subunits, especially NCSTN, PSENEN and PSEN1, have been associated with hidradenitis suppurativa, a chronic inflammatory skin disease. The pathogenesis involves impaired Notch signaling in hair follicles, leading to follicular hyperkeratosis and inflammation. This highlights the importance of gamma-secretase in epithelial biology beyond the nervous system.
Evolutionary and parasitic contexts
Evidence of gamma-secretase complex involvement in intramembrane proteolysis has been reported in Entamoeba histolytica, suggesting conserved roles across evolution. This broadens the relevance of GO:0070765 beyond human disease to basic cell biology and host-pathogen interactions.
From gamma-secretase complex-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of PSEN1 abolish gamma-secretase activity? | PSEN1 knockout cell line |
| How do familial Alzheimer's mutations alter APP processing? | PSEN1 or PSEN2 point-mutation knock-in |
| What is the role of APH1A vs APH1B in substrate selection? | Isoform-specific knockout or overexpression |
| Can we tag the complex for live imaging? | Tagged knock-in of NCT or PSENEN |
| Does overexpression of gSAP modulate gamma-secretase? | Overexpression of GSAP in cell models |
| Which subunits are essential for Notch cleavage? | Knockout of NCSTN, PSENEN or APH1 |
How to Study the gamma-secretase complex Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Genes required for gamma-secretase activity | Identify novel subunits or regulators |
| Co-immunoprecipitation + mass spectrometry | Subunit composition and interactors | Define variant complexes |
| Live-cell imaging | Localization and trafficking of tagged subunits | Study assembly and subcellular distribution |
| In vitro cleavage assay | Proteolytic activity on substrate peptides | Test inhibitors and subunit specificity |
| RNA-seq | Transcriptional changes upon subunit perturbation | Assess downstream Notch or APP effects |
| Western blot | Presenilin endoproteolysis and complex maturation | Validate knockout or knock-in models |
| Notch reporter assay | Notch signaling activity | Functional readout of gamma-secretase |
| Amyloid-beta ELISA | Amyloid-beta peptide production | Measure APP processing in Alzheimer's models |
CRISPR knockout screens
Genome-wide CRISPR knockout screens can identify genes required for gamma-secretase activity or for its substrates' cleavage. By selecting for loss of Notch signaling or altered APP processing, researchers can pinpoint core and regulatory subunits. These screens are particularly useful for uncovering novel modulators of the complex.
Proteomics and interactomics
Affinity purification coupled with mass spectrometry can define the subunit composition of gamma-secretase variants, including associated regulatory proteins such as gSAP, TMED10 and CD147. Proteomic approaches also reveal post-translational modifications and dynamic assembly intermediates.
Imaging and localization studies
Fluorescence microscopy and live-cell imaging of tagged subunits (e.g., GFP-tagged NCT or PSENEN) allow tracking of complex assembly and trafficking. Super-resolution techniques can resolve subcellular localization of distinct variants.
Enzymatic activity assays
In vitro gamma-secretase assays using recombinant complex or membrane preparations measure cleavage of fluorescent or radiolabeled substrates. These assays are used to test selective inhibitors and to compare PSEN1- versus PSEN2-containing complexes.
How CRISPR Can Be Used to Study GO:0070765 gamma-secretase complex
Knockout
CRISPR knockout of core gamma-secretase subunits such as PSEN1, NCSTN, APH1A or PSENEN abolishes complex activity and is used to study essential functions. Knockout cell lines are valuable for dissecting subunit-specific contributions and for creating sensitized backgrounds for rescue experiments.
Point Mutation
Point mutations in PSEN1 or PSEN2 that cause familial Alzheimer's disease can be introduced by CRISPR to model altered APP processing and amyloid-beta production. Such models help distinguish between loss-of-function and gain-of-function effects of specific variants.
Knock-in
Knock-in of tags (e.g., FLAG, GFP) into endogenous loci of NCT, PSENEN or APH1 allows tracking of endogenous complex assembly and localization without overexpression artifacts. Knock-in of disease-associated mutations in APP or PSEN1 creates physiologically relevant disease models.
Overexpression
Overexpression of gamma-secretase subunits or regulatory proteins such as gSAP can enhance complex formation and activity, enabling biochemical studies and gain-of-function screens. Overexpression models are also used to test whether a candidate regulator modulates Notch or APP cleavage.
How EDITGENE Supports gamma-secretase complex Research
Researchers studying gamma-secretase complex-related genes often need to determine whether a candidate gene is causally involved in complex assembly, substrate cleavage or disease progression. EDITGENE provides CRISPR-based cell model services that enable precise genetic manipulation of PSEN1, PSEN2, NCSTN, APH1A/B, PSENEN and related regulatory genes, accelerating functional validation and drug target discovery.
Contact EDITGENE today to design your custom CRISPR model for gamma-secretase complex research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| PSEN1 Knockout HEK293 Cell Line | EDJ-KQ325 | Human | 5663 | Details Get a Quote |
| NCSTN Knockout HEK293 Cell Line | EDJ-KQ434 | Human | 23385 | Details Get a Quote |
| PSEN2 Knockout HEK293 Cell Line | EDJ-KQ443 | Human | 5664 | Details Get a Quote |
| PSENEN Knockout HEK293 Cell Line | EDJ-KQ979 | Human | 55851 | Details Get a Quote |
| APH1B Knockout HEK293 Cell Line | EDJ-KQ3702 | Human | 83464 | Details Get a Quote |
| PSEN2 Knockout A-549 Cell Line | EDJ-KQ18003 | Human | 5664 | Details Get a Quote |
| PSENEN Knockout A-549 Cell Line | EDJ-KQ20001 | Human | 55851 | Details Get a Quote |
| PSENEN Knockout HCT 116 Cell Line | EDJ-KQ20002 | Human | 55851 | Details Get a Quote |
| PSENEN Knockout HeLa Cell Line | EDJ-KQ20003 | Human | 55851 | Details Get a Quote |
| NCSTN Knockout HeLa Cell Line | EDJ-KQ18314 | Human | 23385 | Details Get a Quote |
| PSEN1 Knockout A-549 Cell Line | EDJ-KQ18486 | Human | 5663 | Details Get a Quote |
| PSEN1 Knockout HCT 116 Cell Line | EDJ-KQ18487 | Human | 5663 | Details Get a Quote |
| PSEN1 Knockout HeLa Cell Line | EDJ-KQ18488 | Human | 5663 | Details Get a Quote |
| NCSTN Knockout A-549 Cell Line | EDJ-KQ18730 | Human | 23385 | Details Get a Quote |
| NCSTN Knockout HCT 116 Cell Line | EDJ-KQ18731 | Human | 23385 | Details Get a Quote |
Displaying Records 1 To 15 Of 24 Records
Frequently Asked Questions About gamma-secretase complex
What is the gamma-secretase complex (GO:0070765)?
It is a multi-subunit aspartic-type intramembrane protease complex defined by GO:0070765, containing PSEN1 or PSEN2, APH1, NCT and PSENEN as core subunits, which cleaves type I transmembrane proteins such as Notch and APP.
What genes are involved in the gamma-secretase complex?
Core genes include PSEN1, PSEN2, NCSTN, APH1A, APH1B and PSENEN; regulatory subunits include GSAP, TMED10 and BSG (CD147).
What does gamma-secretase do?
It performs intramembrane proteolysis, cleaving substrates like Notch and amyloid-beta precursor protein within the membrane to release signaling fragments or amyloid-beta peptides.
How is gamma-secretase linked to Alzheimer's disease?
It cleaves APP to produce amyloid-beta peptides, and mutations in PSEN1 or PSEN2 cause familial Alzheimer's disease by altering this cleavage.
What are the subunits of gamma-secretase?
The core complex has four subunits: presenilin (PSEN1 or PSEN2), nicastrin (NCT), APH1 and presenilin enhancer (PSENEN/PEN-2).
Can gamma-secretase be selectively inhibited?
Yes, selective inhibitors of PSEN1-containing gamma-secretase complexes have been developed to target specific variants.
What diseases are associated with gamma-secretase mutations?
Alzheimer's disease, hidradenitis suppurativa and certain cancers such as breast cancer have been linked to gamma-secretase subunit mutations or dysregulation.
How do researchers study gamma-secretase complex assembly?
They use co-immunoprecipitation, mass spectrometry, live-cell imaging of tagged subunits, and CRISPR knockout models.
What is the difference between PSEN1 and PSEN2 in the complex?
Both are catalytic presenilin subunits, but they form distinct complexes with different localization, substrate preferences and inhibitor sensitivity.
What CRISPR models are available for gamma-secretase research?
Knockout, point-mutation, knock-in (including tagged) and overexpression models can be generated for any subunit or regulatory gene.
Conclusion
The gamma-secretase complex (GO:0070765) is a central intramembrane protease whose core subunits PSEN1/PSEN2, APH1, NCT and PSENEN execute cleavage of Notch, APP and other type I transmembrane proteins. Its subunit diversity and regulatory partners create functionally distinct complexes that influence development, neurodegeneration and cancer. Understanding these variants requires precise genetic tools, and CRISPR-based knockout, point-mutation, knock-in and overexpression models are indispensable for dissecting subunit-specific roles and for therapeutic development. As research continues to uncover new regulatory subunits and disease links, the gamma-secretase complex remains a paradigm for intramembrane proteolysis and a high-value target for biomedical investigation.
References
- 1. Hur JY. 2022. γ-Secretase in Alzheimer's disease.. Exp Mol Med 54(4):433-446 PMID: 35396575
- 2. Wolfe MS et al.. 2022. Structure and mechanism of the γ-secretase intramembrane protease complex.. Curr Opin Struct Biol 74:102373 PMID: 35461161
- 3. Xu R et al.. 2025. Key subunits of γ-secretase complex and breast cancer progression: biological function, regulation mode and therapeutic potential.. Biochim Biophys Acta Rev Cancer 1880(4):189386 PMID: 40653037
- 4. Iwatsubo T. 2004. The gamma-secretase complex: machinery for intramembrane proteolysis.. Curr Opin Neurobiol 14(3):379-83 PMID: 15194119
- 5. Serneels L et al.. 2023. Selective inhibitors of the PSEN1-gamma-secretase complex.. J Biol Chem 299(6):104794 PMID: 37164155
- 6. Steiner H. 2004. Uncovering gamma-secretase.. Curr Alzheimer Res 1(3):175-81 PMID: 15975065
- 7. Makiuchi T et al.. 2024. Evidence of γ-secretase complex involved in the regulation of intramembrane proteolysis in Entamoeba histolytica.. Parasitol Int 103:102925 PMID: 39048023
- 8. Villani A. 2025. Hidradenitis suppurativa: pathogenesis.. Eur J Dermatol 35(S1):4-7 PMID: 40530931
