Page last updated: 2024-10-24
threonine-type endopeptidase activity
Definition
Target type: molecularfunction
Catalysis of the hydrolysis of internal peptide bonds in a polypeptide chain by a mechanism in which the hydroxyl group of a threonine residue at the active center acts as a nucleophile. [GOC:mah, https://www.ebi.ac.uk/merops/about/glossary.shtml#CATTYPE, https://www.ebi.ac.uk/merops/about/glossary.shtml#ENDOPEPTIDASE]
Threonine-type endopeptidases are a class of enzymes that catalyze the hydrolysis of peptide bonds within proteins. These enzymes utilize a threonine residue in their active site as a nucleophile to attack the carbonyl carbon of the peptide bond. The mechanism involves the formation of a covalent intermediate between the threonine hydroxyl group and the carbonyl carbon, followed by hydrolysis of the intermediate to release the cleaved peptide fragments. The catalytic activity of threonine-type endopeptidases is often regulated by factors such as pH, temperature, and the presence of cofactors or inhibitors. These enzymes are involved in a wide range of biological processes, including protein degradation, signal transduction, and immune response. They are also found in various organisms, from bacteria to humans. Specific examples of threonine-type endopeptidases include chymotrypsin, trypsin, and elastase, which play critical roles in digestion and other physiological processes.'
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Proteins (7)
| Protein | Definition | Taxonomy |
|---|---|---|
| Proteasome subunit beta type-7 | A proteasome subunit beta type-7 that is encoded in the genome of human. [PRO:DNx] | Homo sapiens (human) |
| Proteasome subunit beta type-10 | A proteasome subunit beta type-10 that is encoded in the genome of human. [PRO:DNx] | Homo sapiens (human) |
| Proteasome subunit beta type-5 | A proteasome subunit beta type-5 that is encoded in the genome of human. [PRO:DNx] | Homo sapiens (human) |
| Proteasome subunit beta type-6 | A proteasome subunit beta type-6 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P28072] | Homo sapiens (human) |
| Proteasome subunit beta type-9 | A proteasome subunit beta type-9 that is encoded in the genome of human. [PRO:DNx] | Homo sapiens (human) |
| Proteasome subunit beta type-8 | A proteasome subunit beta type-8 that is encoded in the genome of human. [PRO:DNx] | Homo sapiens (human) |
| Proteasome subunit beta type-11 | A proteasome subunit beta type-11 that is encoded in the genome of human. [PRO:DNx, UniProtKB:A5LHX3] | Homo sapiens (human) |
Compounds (59)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| gallic acid | gallate : A trihydroxybenzoate that is the conjugate base of gallic acid. | trihydroxybenzoic acid | antineoplastic agent; antioxidant; apoptosis inducer; astringent; cyclooxygenase 2 inhibitor; EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor; geroprotector; human xenobiotic metabolite; plant metabolite |
| chlorpromazine | chlorpromazine : A substituted phenothiazine in which the ring nitrogen at position 10 is attached to C-3 of an N,N-dimethylpropanamine moiety. Chlorpromazine: The prototypical phenothiazine antipsychotic drug. Like the other drugs in this class chlorpromazine's antipsychotic actions are thought to be due to long-term adaptation by the brain to blocking DOPAMINE RECEPTORS. Chlorpromazine has several other actions and therapeutic uses, including as an antiemetic and in the treatment of intractable hiccup. | organochlorine compound; phenothiazines; tertiary amine | anticoronaviral agent; antiemetic; dopaminergic antagonist; EC 3.4.21.26 (prolyl oligopeptidase) inhibitor; phenothiazine antipsychotic drug |
| emodin | emodin : A trihydroxyanthraquinone that is 9,10-anthraquinone which is substituted by hydroxy groups at positions 1, 3, and 8 and by a methyl group at position 6. It is present in the roots and barks of numerous plants (particularly rhubarb and buckthorn), moulds, and lichens. It is an active ingredient of various Chinese herbs. Emodin: Purgative anthraquinone found in several plants, especially RHAMNUS PURSHIANA. It was formerly used as a laxative, but is now used mainly as a tool in toxicity studies. | trihydroxyanthraquinone | antineoplastic agent; laxative; plant metabolite; tyrosine kinase inhibitor |
| vorinostat | vorinostat : A dicarboxylic acid diamide comprising suberic (octanedioic) acid coupled to aniline and hydroxylamine. A histone deacetylase inhibitor, it is marketed under the name Zolinza for the treatment of cutaneous T cell lymphoma (CTCL). Vorinostat: A hydroxamic acid and anilide derivative that acts as a HISTONE DEACETYLASE inhibitor. It is used in the treatment of CUTANEOUS T-CELL LYMPHOMA and SEZARY SYNDROME. | dicarboxylic acid diamide; hydroxamic acid | antineoplastic agent; apoptosis inducer; EC 3.5.1.98 (histone deacetylase) inhibitor |
| 2-methylquinoline | 2-methylquinoline: RN given refers to parent cpd methylquinoline : Any member of the class of quinolines carrying at least one methyl substituent. quinaldine : A quinoline compound in which the quinoline skeleton is substituted at C-2 with a methyl group. | quinolines | |
| 3-methylquinoline | methylquinoline | xenobiotic | |
| epigallocatechin gallate | (-)-epigallocatechin 3-gallate : A gallate ester obtained by the formal condensation of gallic acid with the (3R)-hydroxy group of (-)-epigallocatechin. epigallocatechin gallate: a steroid 5alpha-reductase inhibitor and antimutagen in green tea (Camellia sinensis) | flavans; gallate ester; polyphenol | antineoplastic agent; antioxidant; apoptosis inducer; geroprotector; Hsp90 inhibitor; neuroprotective agent; plant metabolite |
| gallocatechol | (-)-epigallocatechin : A flavan-3,3',4',5,5',7-hexol having (2R,3R)-configuration. | catechin; flavan-3,3',4',5,5',7-hexol | antioxidant; food component; plant metabolite |
| epicatechin gallate | (-)-epicatechin-3-O-gallate : A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of epicatechin. A natural product found in Parapiptadenia rigida. epicatechin gallate: a steroid 5alpha-reductase inhibitor; RN given refers to the (cis)-isomer; structure given in first source; isolated from green tea | catechin; gallate ester; polyphenol | EC 3.2.1.1 (alpha-amylase) inhibitor; EC 3.2.1.20 (alpha-glucosidase) inhibitor; metabolite |
| liquiritigenin | 4',7-dihydroxyflavanone : A dihydroxyflavanone in which the two hydroxy substituents are located at positions 4' and 7. liquiritigenin : A dihydroxyflavanone compound having the two hydroxy substituents at the 4'- and 7-positions. Isolated from the root of Glycyrrhizae uralensis, it is a selective agonist for oestrogen receptor beta. liquiritigenin: structure given in first source; isolated from Pterocarpus marsupium | 4',7-dihydroxyflavanone | hormone agonist; plant metabolite |
| (-)-gallocatechin gallate | (-)-gallocatechin gallate : A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of (-)-gallocatechin. A natural product found in found in green tea. | catechin; gallate ester; polyphenol | antineoplastic agent; EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor; human xenobiotic metabolite; plant metabolite |
| vincaleukoblastine | acetate ester; indole alkaloid fundamental parent; methyl ester; organic heteropentacyclic compound; organic heterotetracyclic compound; tertiary alcohol; tertiary amino compound; vinca alkaloid | antineoplastic agent; immunosuppressive agent; microtubule-destabilising agent; plant metabolite | |
| medicarpin | (-)-medicarpin : The (-)-enantiomer of medicarpin. | medicarpin | plant metabolite |
| bortezomib | amino acid amide; L-phenylalanine derivative; pyrazines | antineoplastic agent; antiprotozoal drug; protease inhibitor; proteasome inhibitor | |
| 5-amino-8-hydroxyquinoline | 5-amino-8-hydroxyquinoline: structure in first source | ||
| naringenin | (S)-naringenin : The (S)-enantiomer of naringenin. | (2S)-flavan-4-one; naringenin | expectorant; plant metabolite |
| eriodictyol | eriodictyol : A tetrahydroxyflavanone that is flavanone substituted by hydroxy groups at positions 5, 7, 3' and 4' respectively. eriodictyol: structure | 3'-hydroxyflavanones; tetrahydroxyflavanone | |
| sdz 283-910 | SDZ 283-910: structure in first source | ||
| 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 |
| mg 262 | MG 262: a proteasome inhibitor | ||
| isoliquiritigenin | chalcones | antineoplastic agent; biological pigment; EC 1.14.18.1 (tyrosinase) inhibitor; GABA modulator; geroprotector; metabolite; NMDA receptor antagonist | |
| (2S)-7-hydroxyflavanone | 7-hydroxyflavanone | ||
| captax | 1,3-benzothiazole-2-thiol : 1,3-Benzothiazole substituted at the 2-position with a sulfanyl group. captax: RN given refers to parent cpd | aryl thiol; benzothiazoles | carcinogenic agent; metabolite |
| 2-mercaptobenzimidazole | 2-mercaptobenzimidazole: purine synthesis antimetabolite; RN given refers to parent cpd | ||
| 2-mercaptobenzoxazole | benzoxazole | ||
| curcumin | curcumin : A beta-diketone that is methane in which two of the hydrogens are substituted by feruloyl groups. A natural dyestuff found in the root of Curcuma longa. Curcumin: A yellow-orange dye obtained from tumeric, the powdered root of CURCUMA longa. It is used in the preparation of curcuma paper and the detection of boron. Curcumin appears to possess a spectrum of pharmacological properties, due primarily to its inhibitory effects on metabolic enzymes. | aromatic ether; beta-diketone; diarylheptanoid; enone; polyphenol | anti-inflammatory agent; antifungal agent; antineoplastic agent; biological pigment; contraceptive drug; dye; EC 1.1.1.205 (IMP dehydrogenase) inhibitor; EC 1.1.1.21 (aldehyde reductase) inhibitor; EC 1.1.1.25 (shikimate dehydrogenase) inhibitor; EC 1.6.5.2 [NAD(P)H dehydrogenase (quinone)] inhibitor; EC 1.8.1.9 (thioredoxin reductase) inhibitor; EC 2.7.10.2 (non-specific protein-tyrosine kinase) inhibitor; EC 3.5.1.98 (histone deacetylase) inhibitor; flavouring agent; food colouring; geroprotector; hepatoprotective agent; immunomodulator; iron chelator; ligand; lipoxygenase inhibitor; metabolite; neuroprotective agent; nutraceutical; radical scavenger |
| 5-chloro-1h-benzimidazole-2-thiol | 5-chloro-1H-benzimidazole-2-thiol: trypanocidal | ||
| 5-chloro-2-mercaptobenzothiazole | |||
| orlistat | orlistat : A carboxylic ester resulting from the formal condensation of the carboxy group of N-formyl-L-leucine with the hydroxy group of (3S,4S)-3-hexyl-4-[(2S)-2-hydroxytridecyl]oxetan-2-one. A pancreatic lipase inhibitor, it is used as an anti-obesity drug. Orlistat: A lactone derivative of LEUCINE that acts as a pancreatic lipase inhibitor to limit the absorption of dietary fat; it is used in the management of obesity. | beta-lactone; carboxylic ester; formamides; L-leucine derivative | anti-obesity agent; bacterial metabolite; EC 2.3.1.85 (fatty acid synthase) inhibitor; EC 3.1.1.3 (triacylglycerol lipase) inhibitor |
| quercetin | 7-hydroxyflavonol; pentahydroxyflavone | antibacterial agent; antineoplastic agent; antioxidant; Aurora kinase inhibitor; chelator; EC 1.10.99.2 [ribosyldihydronicotinamide dehydrogenase (quinone)] inhibitor; geroprotector; phytoestrogen; plant metabolite; protein kinase inhibitor; radical scavenger | |
| formononetin | 4'-methoxyisoflavones; 7-hydroxyisoflavones | phytoestrogen; plant metabolite | |
| apigenin | Chamomile: Common name for several daisy-like plants (MATRICARIA; TRIPLEUROSPERMUM; ANTHEMIS; CHAMAEMELUM) native to Europe and Western Asia, now naturalized in the United States and Australia. | trihydroxyflavone | antineoplastic agent; metabolite |
| luteolin | 3'-hydroxyflavonoid; tetrahydroxyflavone | angiogenesis inhibitor; anti-inflammatory agent; antineoplastic agent; apoptosis inducer; c-Jun N-terminal kinase inhibitor; EC 2.3.1.85 (fatty acid synthase) inhibitor; immunomodulator; nephroprotective agent; plant metabolite; radical scavenger; vascular endothelial growth factor receptor antagonist | |
| kaempferol | 7-hydroxyflavonol; flavonols; tetrahydroxyflavone | antibacterial agent; geroprotector; human blood serum metabolite; human urinary metabolite; human xenobiotic metabolite; plant metabolite | |
| genistein | 7-hydroxyisoflavones | antineoplastic agent; EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor; geroprotector; human urinary metabolite; phytoestrogen; plant metabolite; tyrosine kinase inhibitor | |
| chrysin | chrysin : A dihydroxyflavone in which the two hydroxy groups are located at positions 5 and 7. | 7-hydroxyflavonol; dihydroxyflavone | anti-inflammatory agent; antineoplastic agent; antioxidant; EC 2.7.11.18 (myosin-light-chain kinase) inhibitor; hepatoprotective agent; plant metabolite |
| myricetin | 7-hydroxyflavonol; hexahydroxyflavone | antineoplastic agent; antioxidant; cyclooxygenase 1 inhibitor; food component; geroprotector; hypoglycemic agent; plant metabolite | |
| daidzein | 7-hydroxyisoflavones | antineoplastic agent; EC 2.7.7.7 (DNA-directed DNA polymerase) inhibitor; EC 3.2.1.20 (alpha-glucosidase) inhibitor; phytoestrogen; plant metabolite | |
| benzyloxycarbonyl-phe-ala-fluormethylketone | cathepsin B inhibitor : A cysteine protease inhibitor which inhibits cathepsin B (EC 3.4.22.1). | ||
| (-)-catechin-3-O-gallate | (-)-catechin-3-O-gallate : A gallate ester obtained by formal condensation of the carboxy group of gallic acid with the (3R)-hydroxy group of (-)-catechin. | flavans; gallate ester; polyphenol | metabolite |
| am 404 | anilide | ||
| lactacystin | lactam; S-substituted L-cysteine | ||
| 2-(quinolin-2-ylmethylene)hydrazinecarbothioamide | 2-(quinolin-2-ylmethylene)hydrazinecarbothioamide: a topoisomerase II alpha inhibitor; has antineoplastic activity; structure in first source | ||
| clasto-lactacystin beta-lactone | clasto-lactacystin beta-lactone: active metabolite of lactacystin; inhibits 20 S proteasome; structure in first source | ||
| benzyloxycarbonyl-isoleucyl-glutamyl(o-tert-butyl)-alanyl-leucinal | benzyloxycarbonyl-isoleucyl-glutamyl(O-tert-butyl)-alanyl-leucinal: inhibits chymotrypsin activity of the proteasome | ||
| epoxomicin | morpholines; tripeptide | proteasome inhibitor | |
| marizomib | marizomib: a proteasome inhibitor from a marine bacterium Salinospora; structure in first source | beta-lactone; gamma-lactam; organic heterobicyclic compound; organochlorine compound; salinosporamide | antineoplastic agent; proteasome inhibitor |
| ridaifen-b | ridaifen-B: structure in first source | ||
| carfilzomib | epoxide; morpholines; tetrapeptide | antineoplastic agent; proteasome inhibitor | |
| tyropeptin a | tyropeptin A: proteasome inhibitors produced by Kitasatospora sp. MK993-dF2; structure in first source | dipeptide | |
| pr-957 | |||
| delanzomib | C-terminal boronic acid peptide; phenylpyridine; secondary alcohol; threonine derivative | antineoplastic agent; apoptosis inducer; proteasome inhibitor | |
| belactosin a | belactosin A: isolated from Streptomyces; structure in first source | ||
| oprozomib | ONX 0912: antineoplastic; an orally active proteasome inhibitor; structure in first source | ||
| ixazomib | ixazomib : A glycine derivative that is the amide obtained by formal condensation of the carboxy group of N-(2,5-dichlorobenzoyl)glycine with the amino group of [(1R)-1-amino-3-methylbutyl]boronic acid. The active metabolite of ixazomib citrate, it is used in combination therapy for treatment of multiple myeloma. ixazomib: a proteasome inhibitor with antineoplastic activity; MLN2238 is the biologically active form of MLN9708; structure in first source | benzamides; boronic acids; dichlorobenzene; glycine derivative | antineoplastic agent; apoptosis inducer; drug metabolite; orphan drug; proteasome inhibitor |
| pr-957 | PR-957: immunoproteasome inhibitor; inhibits Lmp7 protein; structure in first source | ||
| mln 9708 | |||
| acy-1215 | ricolinostat: an HDAC6 inhibitor; structure in first source | pyrimidinecarboxylic acid | |
| pi-1840 | PI-1840: has both antineoplastic and proteasome inhibitory activities; structure in first source |