Target type: cellularcomponent
A protein complex that has aspartic-type endopeptidase activity and contains a presenilin catalytic subunit (either PSEN1 or PSEN2), an APH1 subunit (multiple genes and splice variants exist), nicastrin (NCT), and presenilin enhancer (aka PEN-2 or Psenen), as the core complex. Variants of the complex with different subunit compositions differ in localization and specific substrates. Additionally, variants of the complex exist that contain a additional regulatory subunit as well as the four core subunits; known regulatory subunits include gamma-secretase-activating protein (aka gSAP), TMP1 (aka TMED10), and CD147 antigen (aka basigin). Gamma-secretase cleaves type I transmembrane protein substrates, including the cell surface receptor Notch and the amyloid-beta precursor protein. [GOC:krc, PMID:15286082, PMID:15890777, PMID:17047368, PMID:22122073, PMID:25565961, PMID:28320827, PMID:32616437]
The gamma-secretase complex is a multi-protein complex responsible for the intramembrane cleavage of various type I transmembrane proteins. It is crucial in the production of amyloid-beta peptide, a key player in Alzheimer's disease. The complex comprises four integral membrane proteins:
- **Presenilin (PSEN1 or PSEN2):** The catalytic subunit that performs the intramembrane cleavage.
- **Nicastrin (NCT):** A large, type I transmembrane protein that plays a role in substrate recognition and interacts with PSEN.
- **Aph-1 (APH1A or APH1B):** A small type I transmembrane protein that interacts with PSEN and contributes to complex assembly and stability.
- **Pen-2 (PEN2):** A small type II transmembrane protein that facilitates the maturation of PSEN.
These proteins assemble into a complex in the endoplasmic reticulum (ER) and then traffic to the Golgi apparatus and ultimately to the cell surface and endosomes. The complex is highly dynamic, with different subunits undergoing turnover and replacement.
The specific cellular component of the gamma-secretase complex is the **transmembrane domain** of the endoplasmic reticulum (ER) membrane. This is where the complex resides and performs its catalytic activity. The complex is localized to the ER lumen, with its active site facing the ER lumen. It is important to note that the complex can also be found in other cellular compartments, such as the Golgi apparatus, endosomes, and lysosomes, but its primary location is the ER membrane.
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| Protein | Definition | Taxonomy |
|---|---|---|
| Gamma-secretase subunit PEN-2 | A gamma-secretase subunit PEN-2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9NZ42] | Homo sapiens (human) |
| Gamma-secretase subunit APH-1A | A gamma-secretase subunit APH-1A that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q96BI3] | Homo sapiens (human) |
| Nicastrin | A nicastrin that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q92542] | Homo sapiens (human) |
| Gamma-secretase subunit APH-1B | A gamma-secretase subunit APH-1B that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q8WW43] | Homo sapiens (human) |
| Presenilin-2 | A presenilin-2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P49810] | Homo sapiens (human) |
| Presenilin-1 | A presenilin-1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P49768] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| tocopheroxy radical | tocopheroxy radical: RN given refers to radical ion (1+), (2R-(2R*(4R*,8R*)))-isomer; RN for cpd without isomeric designation not available 12/90 | tocopherol | |
| 7-amino-4-chloro-3-methoxy-2-benzopyran-1-one | isocoumarins | ||
| tarenflurbil | tarenflurbil: R-enantiomer of flurbiprofen but not a COX inhibitor; modulates NF-kB, gamma-secretase, amyloid beta-protein; | flurbiprofen | |
| cholanic acid | 5beta-cholanic acids; cholanic acid | ||
| t0901317 | T0901317: an LXRalpha and LXRbeta agonist | ||
| benzyloxycarbonylleucyl-leucyl-leucine aldehyde | benzyloxycarbonylleucyl-leucyl-leucine aldehyde: proteasome inhibitor N-benzyloxycarbonyl-L-leucyl-L-leucyl-L-leucinal : A tripeptide that is L-leucyl-L-leucyl-L-leucine in which the C-terminal carboxy group has been reduced to the corresponding aldehyde and the N-terminal amino group is protected as its benzyloxycarbonyl derivative. | amino aldehyde; carbamate ester; tripeptide | proteasome inhibitor |
| n-(n-(3,5-difluorophenacetyl)alanyl)phenylglycine tert-butyl ester | DAPT : A dipeptide consisting of alanylphenylglycine derivatised as a 3,5-difluorophenylacetamide at the amino terminal and a tert-butyl ester at the carboxy terminal. A gamma-secretase inhibitor. | carboxylic ester; difluorobenzene; dipeptide; tert-butyl ester | EC 3.4.23.46 (memapsin 2) inhibitor |
| sulindac sulfide | sulindac sulfide : An aryl sulfide that is a metabolite of sulindac. A non-steroidal anti-inflammatory drug, which also has anticancer activity. sulindac sulfide: sulfated analog of indomethacin & inhibitor of prostaglandin synthesis in vitro; RN given refers to cpd without isomeric designation; structure given in first source | aryl sulfide; monocarboxylic acid; organofluorine compound | antineoplastic agent; apoptosis inducer; non-steroidal anti-inflammatory drug |
| l 685458 | L 685458: a gamma-secretase inhibitor; structure in first source L-685,458 : A peptide and carboxamide that is L-leucyl-L-phenylalaninamide, L-Leu-L-Phe-NH2, which has been acylated on the N-terminus by a Phe-Phe hydroxyethylene dipeptide isotere, 2R-benzyl-5S-tert-butoxycarbonylamino-4R-hydroxy-6-phenylhexanoic acid. Compounds based on the structure of L-685,458 are potent inhibitors of gamma-secretase, which mediates the final catalytic step that generates the amyloid beta-peptide (Abeta), which assembles into the neurotoxic aggregates in the brains of sufferers of Alzheimer's disease. | carbamate ester; monocarboxylic acid amide; peptide; secondary alcohol | EC 3.4.23.46 (memapsin 2) inhibitor; peptidomimetic |
| mk 0752 | |||
| ly 450139 | peptide | ||
| chf 5074 | 1-(3',4'-dichloro-2-fluoro(1,1'-biphenyl)-4-yl)cyclopropanecarboxylic acid: a beta-amyloid(1-42) lowering agent; structure in first source | ||
| ly 411575 | dibenzoazepine; difluorobenzene; lactam; secondary alcohol | EC 3.4.23.46 (memapsin 2) inhibitor | |
| 4-(2-((1r)-1-(((4-chlorophenyl)sulfonyl)-2,5-difluoroanilino)ethyl)-5-fluorophenyl)butanoic acid | sulfonamide | ||
| begacestat | |||
| e 2012 | |||
| mrk 560 | MRK 560: a gamma-secretase inhibitor; MRK-560 is the (cis)-isomer; structure in first source | ||
| 1, 3-di-(n-carboxybenzoyl-leucyl-leucyl)amino acetone | 1, 3-di-(N-carboxybenzoyl-leucyl-leucyl)amino acetone: structure in first source | ||
| pf 3084014 | nirogacestat : A member of the class of imidazoles that is 1H-imidazole substituted by a 1-[(2,2-dimethylpropyl)amino]-2-methylpropan-2-yl group at position 1 and a {N-[(2S)-6,8-difluoro-1,2,3,4-tetrahydronaphthalen-2-yl]-L-norvalyl}amino group at position 4. It is a gamma-secretase inhibitor whose hydrobromide salt is indicated for adult patients with progressing desmoid tumours who require systemic treatment. nirogacestat: an antineoplastic agent | ||
| bms 708163 | BMS 708163: structure in first source | oxadiazole; ring assembly | |
| ro 4929097 | dibenzoazepine; dicarboxylic acid diamide; lactam; organofluorine compound | EC 3.4.23.46 (memapsin 2) inhibitor | |
| jnj 40418677 | |||
| (r)-4-cyclopropyl-7,8-difluoro-5-(4-(trifluoromethyl)phenylsulfonyl)-4,5-dihydro-1h-pyrazolo(4,3-c)quinoline | (R)-4-cyclopropyl-7,8-difluoro-5-(4-(trifluoromethyl)phenylsulfonyl)-4,5-dihydro-1H-pyrazolo(4,3-c)quinoline: gamma secretase inhibitor; structure in first source |