Target type: molecularfunction
Catalysis of the reaction: a phosphoprotein + H2O = a protein + phosphate. Together with protein kinases, these enzymes control the state of phosphorylation of cellular proteins and thereby provide an important mechanism for regulating cellular activity. [ISBN:0198547684]
Phosphoprotein phosphatase activity refers to the enzymatic removal of phosphate groups from phosphorylated proteins. This process is crucial for regulating a wide range of cellular processes, including signal transduction, gene expression, cell growth and division, and metabolism. Phosphoprotein phosphatases play a vital role in reversing the actions of protein kinases, which add phosphate groups to proteins. This dynamic interplay between kinases and phosphatases allows for precise control of protein activity and cellular function.
Phosphoprotein phosphatases are highly specific in their substrate recognition, often targeting specific amino acid residues within their target proteins. They can also be regulated by various factors, such as changes in cellular conditions, the presence of regulatory subunits, and interaction with other proteins. This regulation ensures that phosphatase activity is tightly controlled and appropriate for the specific cellular context.
The dephosphorylation process catalyzed by phosphoprotein phosphatases involves the hydrolysis of a phosphate ester bond. This reaction typically occurs in two steps:
1. **Formation of a phosphoenzyme intermediate:** The phosphate group from the phosphorylated protein is transferred to an active site residue on the phosphatase enzyme, forming a transient phosphoenzyme intermediate.
2. **Hydrolysis of the phosphoenzyme:** The phosphate group is removed from the phosphoenzyme intermediate and released as inorganic phosphate, regenerating the active phosphatase enzyme.
The diverse range of cellular processes influenced by phosphoprotein phosphatases highlights their importance in maintaining cellular homeostasis and responding to external stimuli. Dysregulation of phosphatase activity can contribute to various disease states, including cancer, diabetes, and neurodegenerative disorders.
In summary, phosphoprotein phosphatase activity is essential for the precise control of protein function through the removal of phosphate groups from target proteins. This process is critical for a wide range of cellular processes, including signal transduction, gene expression, cell growth and division, and metabolism. Understanding the molecular mechanisms of phosphoprotein phosphatase activity is crucial for developing therapeutic strategies targeting these enzymes in the treatment of various diseases.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Serine/threonine-protein phosphatase PP1-gamma catalytic subunit | A serine/threonine-protein phosphatase PP1-gamma catalytic subunit that is encoded in the genome of human. [PRO:DNx, UniProtKB:P36873] | Homo sapiens (human) |
| M-phase inducer phosphatase 3 | An M-phase inducer phosphatase 3 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P30307] | Homo sapiens (human) |
| M-phase inducer phosphatase 2 | An M-phase inducer phosphatase 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P30305] | Homo sapiens (human) |
| M-phase inducer phosphatase 1 | An M-phase inducer phosphatase 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P30304] | Homo sapiens (human) |
| Serine/threonine-protein phosphatase 2A activator | A serine/threonine-protein phosphatase 2A regulatory subunit B that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q15257] | Homo sapiens (human) |
| Receptor-type tyrosine-protein phosphatase S | A receptor-type tyrosine-protein phosphatase S that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q13332] | Homo sapiens (human) |
| Tyrosine-protein phosphatase non-receptor type 11 | A tyrosine-protein phosphatase non-receptor type 11 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q06124] | Homo sapiens (human) |
| Tyrosine-protein phosphatase non-receptor type 12 | A tyrosine-protein phosphatase non-receptor type 12 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q05209] | Homo sapiens (human) |
| Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform | A serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform that is encoded in the genome of human. [PRO:CNA, UniProtKB:P67775] | Homo sapiens (human) |
| Phosphatidylinositol 3,4,5-trisphosphate 3-phosphatase and dual-specificity protein phosphatase PTEN | A phosphatidylinositol 3,4,5-trisphosphate 3-phosphatase and dual-specificity protein phosphatase PTEN that is encoded in the genome of human. [PRO:PD, UniProtKB:P60484] | Homo sapiens (human) |
| Serine/threonine-protein phosphatase 5 | A serine/threonine-protein phosphatase 5 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P53041] | Homo sapiens (human) |
| Serine/threonine-protein phosphatase PP1-gamma catalytic subunit | A serine/threonine-protein phosphatase PP1-gamma catalytic subunit that is encoded in the genome of human. [PRO:DNx, UniProtKB:P36873] | Homo sapiens (human) |
| M-phase inducer phosphatase 3 | An M-phase inducer phosphatase 3 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P30307] | Homo sapiens (human) |
| M-phase inducer phosphatase 2 | An M-phase inducer phosphatase 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P30305] | Homo sapiens (human) |
| M-phase inducer phosphatase 1 | An M-phase inducer phosphatase 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P30304] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| 2-(2-hydroxyethylsulfanyl)-3-methyl-1,4-naphthoquinone | |||
| 2,3-dimethoxy-1,4-naphthoquinone | 2,3-dimethoxynaphthalene-1,4-dione : A naphthoquinone that is 1,4-naphthoquinone bearing two methoxy substituents at positions 2 and 3. Redox-cycling agent that induces intracellular superoxide anion formation and, depending on the concentration, induces cell proliferation, apoptosis or necrosis. Used to study the role of ROS in cell toxicity, apoptosis, and necrosis. | 1,4-naphthoquinones | |
| miltefosine | miltefosine : A phospholipid that is the hexadecyl monoester of phosphocholine. miltefosine: hexadecyl phosphocholine derivative of cisplatin; did not substantially activate HIV long terminal repeat; less toxic than cisplatin | phosphocholines; phospholipid | anti-inflammatory agent; anticoronaviral agent; antifungal agent; antineoplastic agent; antiprotozoal drug; apoptosis inducer; immunomodulator; protein kinase inhibitor |
| 1-(2-naphthalenyl)-3-[(phenylmethyl)-propan-2-ylamino]-1-propanone | ZM39923: structure in first source | naphthalenes | |
| juglone | juglone : A hydroxy-1,4-naphthoquinone that is 1,4-naphthoquinone in which the hydrogen at position 5 has been replaced by a hydroxy group. A plant-derived 1,4-naphthoquinone with confirmed antibacterial and antitumor activities. juglone: structure | hydroxy-1,4-naphthoquinone | geroprotector; herbicide; reactive oxygen species generator |
| lapachol | lapachol : A hydroxy-1,4-naphthoquinone that is 1,4-naphthoquinone substituted by hydroxy and 3-methylbut-2-en-1-yl groups at positions 2 and 3, respectively. It is a natural compound that exhibits antibacterial and anticancer properties, first isolated in 1882 from the bark of Tabebuia avellanedae. | ||
| beta-lapachone | beta-lapachone : A benzochromenone that is 3,4-dihydro-2H-benzo[h]chromene-5,6-dione substituted by geminal methyl groups at position 2. Isolated from Tabebuia avellanedae, it exhibits antineoplastic and anti-inflammatory activities. beta-lapachone: antineoplastic inhibitor of reverse transcriptase, DNA topoisomerase, and DNA polymerase | benzochromenone; orthoquinones | anti-inflammatory agent; antineoplastic agent; plant metabolite |
| vitamin k 3 | Vitamin K 3: A synthetic naphthoquinone without the isoprenoid side chain and biological activity, but can be converted to active vitamin K2, menaquinone, after alkylation in vivo. | 1,4-naphthoquinones; vitamin K | angiogenesis inhibitor; antineoplastic agent; EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor; human urinary metabolite; nutraceutical |
| quinone | 1,4-benzoquinone : The simplest member of the class of 1,4-benzoquinones, obtained by the formal oxidation of hydroquinone to the corresponding diketone. It is a metabolite of benzene. benzoquinone : The simplest members of the class of benzoquinones, consisting of cyclohexadiene which is substituted by two oxo groups. quinone : Compounds having a fully conjugated cyclic dione structure, such as that of benzoquinones, derived from aromatic compounds by conversion of an even number of -CH= groups into -C(=O)- groups with any necessary rearrangement of double bonds (polycyclic and heterocyclic analogues are included). | 1,4-benzoquinones | cofactor; human xenobiotic metabolite; mouse metabolite |
| cantharidin | cantharidin : A monoterpenoid with an epoxy-bridged cyclic dicarboxylic anhydride structure secreted by many species of blister beetle, and most notably by the Spanish fly, Lytta vesicatoria. Natural toxin inhibitor of protein phosphatases 1 and 2A. Cantharidin: A toxic compound, isolated from the Spanish fly or blistering beetle (Lytta (Cantharis) vesicatoria) and other insects. It is a potent and specific inhibitor of protein phosphatases 1 (PP1) and 2A (PP2A). This compound can produce severe skin inflammation, and is extremely toxic if ingested orally. | cyclic dicarboxylic anhydride; monoterpenoid | EC 3.1.3.16 (phosphoprotein phosphatase) inhibitor; herbicide |
| 9,10-anthraquinone | 9,10-anthraquinone : An anthraquinone that is anthracene in which positions 9 and 10 have been oxidised to carbonyls. | anthraquinone | |
| 1-naphthylphenylamine | N-phenyl-1-naphthylamine: RN given refers to 1-naphthylamine cpd; structure | naphthalenes | |
| 1,4-naphthoquinone | 1,4-naphthoquinone : The parent structure of the family of 1,4-naphthoquinones, in which the oxo groups of the quinone moiety are at positions 1 and 4 of the naphthalene ring. Derivatives have pharmacological properties. naphthoquinone : A polycyclic aromatic ketone metabolite of naphthalene. | 1,4-naphthoquinones | |
| yohimbine | yohimbine : An indole alkaloid with alpha2-adrenoceptor antagonist activity. It is produced by Corynanthe johimbe and Rauwolfia serpentina. Yohimbine: A plant alkaloid with alpha-2-adrenergic blocking activity. Yohimbine has been used as a mydriatic and in the treatment of ERECTILE DYSFUNCTION. | methyl 17-hydroxy-20xi-yohimban-16-carboxylate | alpha-adrenergic antagonist; dopamine receptor D2 antagonist; serotonergic antagonist |
| glycyrrhetinic acid | cyclic terpene ketone; hydroxy monocarboxylic acid; pentacyclic triterpenoid | immunomodulator; plant metabolite | |
| naphthazarin | naphthazarin : A naphthoquinone that is 1,4-naphthoquinone in which the hydrogens at positions 5 and 8 are replaced by hydroxy groups. naphthazarin: fish toxin; isolated for first time from the walnut onigurmi, Juglans mandshurica maxim var. Sieboldiana Makino; structure | hydroxy-1,4-naphthoquinone | acaricide; antibacterial agent; antineoplastic agent; apoptosis inducer; geroprotector; plant metabolite |
| plumbagin | plumbagin : A hydroxy-1,4-naphthoquinone that is 1,4-naphthoquinone in which the hydrogens at positions 2 and 5 are substituted by methyl and hydroxy groups, respectively. plumbagin: a superoxide anion generator | hydroxy-1,4-naphthoquinone; phenols | anticoagulant; antineoplastic agent; immunological adjuvant; metabolite |
| oxanilic acid | oxanilic acid: RN given refers to parent cpd; structure | ||
| oleanolic acid | hydroxy monocarboxylic acid; pentacyclic triterpenoid | plant metabolite | |
| 2-methoxy-1,4-naphthoquinone | 2-methoxy-1,4-naphthoquinone : A naphthoquinone that is naphthalene-1,4-dione substituted by a methoxy group at position 2. It has been isolated from the roots of Rubia yunnanensis. 2-methoxy-1,4-naphthoquinone: isolated from Swertia calycina; structure in first source | 1,4-naphthoquinones; enol ether | antimicrobial agent; metabolite; plant metabolite |
| phosphotyrosine | O(4)-phospho-L-tyrosine : A non-proteinogenic L-alpha-amino acid that is L-tyrosine phosphorylated at the phenolic hydroxy group. Phosphotyrosine: An amino acid that occurs in endogenous proteins. Tyrosine phosphorylation and dephosphorylation plays a role in cellular signal transduction and possibly in cell growth control and carcinogenesis. | L-tyrosine derivative; non-proteinogenic L-alpha-amino acid; O(4)-phosphotyrosine | Escherichia coli metabolite; immunogen |
| vanadates | vanadate(3-) : A vanadium oxoanion that is a trianion with formula VO4 in which the vanadium is in the +5 oxidation state and is attached to four oxygen atoms. Vanadates: Oxyvanadium ions in various states of oxidation. They act primarily as ion transport inhibitors due to their inhibition of Na(+)-, K(+)-, and Ca(+)-ATPase transport systems. They also have insulin-like action, positive inotropic action on cardiac ventricular muscle, and other metabolic effects. | trivalent inorganic anion; vanadium oxoanion | EC 3.1.3.1 (alkaline phosphatase) inhibitor; EC 3.1.3.16 (phosphoprotein phosphatase) inhibitor; EC 3.1.3.41 (4-nitrophenylphosphatase) inhibitor; EC 3.1.3.48 (protein-tyrosine-phosphatase) inhibitor |
| 4-methylumbelliferyl phosphate | |||
| buparvaquone | buparvaquone: used in therapy of theileriasis; structure given in first source | ||
| illimaquinone | illimaquinone: structure given in first source; isolated from the Red Sea sponge Smenospongia; inhibits the RNase H. activity of HIV-1 reverse transcriptase | monohydroxy-1,4-benzoquinones; prenylquinone | metabolite |
| maslinic acid | (2Alpha,3beta)-2,3-dihydroxyolean-12-en-28-oic acid: from Luehea divaricata and Agrimonia eupatoria | dihydroxy monocarboxylic acid; pentacyclic triterpenoid | anti-inflammatory agent; antineoplastic agent; antioxidant; plant metabolite |
| ortho-(1-naphthoyl)benzoic acid | ortho-(1-naphthoyl)benzoic acid: structure in first source | ||
| nsc-87877 | NSC-87877: potent Shp2 (nonreceptor protein tyrosine phosphatase) inhibitor; structure in first source | ||
| 6,7-dichloroquinoline-5,8-dione | 6,7-dichloro-5,8-quinolinedione: structure in first source | ||
| tingenone | tingenone: quinonoid triterpene isolated from Euonymus tingens | ||
| geniposide | terpene glycoside | ||
| tanshinone | tanshinone: from root of Salvia miltiorrhiza Bunge; RN given refers to tanshinone I; cardioprotective agent and neuroprotective agent | abietane diterpenoid | anticoronaviral agent |
| celastrol | monocarboxylic acid; pentacyclic triterpenoid | anti-inflammatory drug; antineoplastic agent; antioxidant; EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor; Hsp90 inhibitor; metabolite | |
| cryptotanshinone | cryptotanshinone: from Salvia miltiorrhiza | abietane diterpenoid | anticoronaviral agent |
| tanshinone ii a | tashinone IIA: a cardiovascular agent with antineoplastic activity; isolated from Salvia miltiorrhiza; structure in first source | abietane diterpenoid | |
| pinocembrin | |||
| nsc-89199 | estramustine phosphate : A steroid phosphate which is the 17-O-phospho derivative of estramustine. | carbamate ester; organochlorine compound; steroid phosphate | |
| estramustine | estramustine : A carbamate ester obtained by the formal condensation of the hydroxy group of 17beta-estradiol with the carboxy group of bis(2-chloroethyl)carbamic acid. Estramustine: A nitrogen mustard linked to estradiol, usually as phosphate; used to treat prostatic neoplasms; also has radiation protective properties. | 17beta-hydroxy steroid; carbamate ester; organochlorine compound | alkylating agent; antineoplastic agent; radiation protective agent |
| nsc 95397 | 1,4-naphthoquinones | ||
| nsc 663284 | NSC 663284: structure in first source | quinolone | |
| nsc668394 | |||
| Tautomycin | carboxylic ester | ||
| genipin | iridoid monoterpenoid | anti-inflammatory agent; antioxidant; apoptosis inhibitor; cross-linking reagent; hepatotoxic agent; uncoupling protein inhibitor | |
| cyanoginosin lr | cyanoginosin LR: cyclic heptapeptide from cyanobacterium Microcystis aeruginosa microcystin-LR : A microcystin consisting of D-alanyl, L-leucyl, (3S)-3-methyl-D-beta-aspartyl,L-arginyl, 2S,3S,4E,6E,8S,9S)-3-amino-4,5,6,7-tetradehydro-9-methoxy-2,6,8-trimethyl-10-phenyldecanoyl, D-gamma-glutamyl, and 2,3-didehydro-N-methylalanyl residues joined into a 25-membered macrocycle. Produced by the cyanobacterium Microcystis aeruginosa, it is the most studied of the microcystins. | microcystin | bacterial metabolite; EC 3.1.3.16 (phosphoprotein phosphatase) inhibitor; environmental contaminant; xenobiotic |
| okadaic acid | polycyclic ether | calcium ionophore; EC 3.1.3.16 (phosphoprotein phosphatase) inhibitor; marine metabolite | |
| shikonin | shikonin: a naphthazarin; has antineoplastic and angiogenesis inhibiting activities | hydroxy-1,4-naphthoquinone | |
| cefsulodin | cefsulodin : A pyridinium-substituted semi-synthetic, broad-spectrum, cephalosporin antibiotic. Cefsulodin: A pyridinium-substituted semisynthetic, broad-spectrum antibacterial used especially for Pseudomonas infections in debilitated patients. | cephalosporin; organosulfonic acid; primary carboxamide | antibacterial drug |
| ag-213 | tyrphostin 47: inhibits protein-tyrosine kinase activity of EGF-R both in vitro and in living cells; | ||
| 2-[[5-(3-chlorophenyl)-4-prop-2-enyl-1,2,4-triazol-3-yl]thio]-1-(3,4-dihydroxyphenyl)ethanone | aromatic ketone | ||
| tocopherylquinone | tocopherylquinone: RN refers to (3R-(3R*,7R*,11R*))-isomer; structure | ||
| nsc 117199 | |||
| illudalic acid | illudalic acid: isolated from Clitocybe illudens; structure in first source | ||
| baicalein | trihydroxyflavone | angiogenesis inhibitor; anti-inflammatory agent; antibacterial agent; anticoronaviral agent; antifungal agent; antineoplastic agent; antioxidant; apoptosis inducer; EC 1.13.11.31 (arachidonate 12-lipoxygenase) inhibitor; EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor; EC 3.4.21.26 (prolyl oligopeptidase) inhibitor; EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor; EC 4.1.1.17 (ornithine decarboxylase) inhibitor; ferroptosis inhibitor; geroprotector; hormone antagonist; plant metabolite; prostaglandin antagonist; radical scavenger | |
| morin | morin : A pentahydroxyflavone that is 7-hydroxyflavonol bearing three additional hydroxy substituents at positions 2' 4' and 5. morin: a light yellowish pigment found in the wood of old fustic (Chlorophora tinctoria) | 7-hydroxyflavonol; pentahydroxyflavone | angiogenesis modulating agent; anti-inflammatory agent; antibacterial agent; antihypertensive agent; antineoplastic agent; antioxidant; EC 5.99.1.2 (DNA topoisomerase) inhibitor; hepatoprotective agent; metabolite; neuroprotective agent |
| morusin | morusin : An extended flavonoid that is flavone substituted by hydroxy groups at positions 5, 2' and 4', a prenyl group at position 3 and a 2,2-dimethyl pyran group across positions 7 and 8. morusin: from Morus root bark; structure given in first source | extended flavonoid; trihydroxyflavone | antineoplastic agent; plant metabolite |
| scutellarein | scutellarein : Flavone substituted with hydroxy groups at C-4', -5, -6 and -7. scutellarein: aglycone of scutellarin from Scutellaria baicalensis; carthamidin is 2S isomer of scutellarein; do not confuse with isoscutellarein and/or isocarthamidin which are respective regioisomers, or with the scutelarin protein | tetrahydroxyflavone | metabolite |
| tricetin | tricetin : Flavone hydroxylated at positions 3', 4', 5, 5' and 7. | pentahydroxyflavone | antineoplastic agent; metabolite |
| trans-2,3',4,5'-tetrahydroxystilbene | trans-2,3',4,5'-tetrahydroxystilbene: hydroxystilbene oxyresveratrol | stilbenoid | |
| rottlerin | rottlerin : A chromenol that is 2,2-dimethyl-2H-chromene substituted by hydroxy groups at positions 5 and 7, a 3-acetyl-2,4,6-trihydroxy-5-methylbenzyl group at position 6 and a (1E)-3-oxo-1-phenylprop-1-en-3-yl group at position 8. A potassium channel opener, it is isolated from Mallotus philippensis. rottlerin: an angiogenesis inhibitor; an inhibitor of protein kinase Cdelta (PKCdelta) and calmodulin kinase III; RN refers to (E)-isomer; do not confuse this chalcone with an anthraquinone that is also called rottlerin (RN 481-72-1); | aromatic ketone; benzenetriol; chromenol; enone; methyl ketone | anti-allergic agent; antihypertensive agent; antineoplastic agent; apoptosis inducer; K-ATP channel agonist; metabolite |
| calyculin a | calyculin A: RN given refers to (5S-(5alpha(2R*(1S*,3S*,4S*,5R*,6R*,7E,9E,11E,13Z),3R*),7beta(E(S*)),*beta,9alpha))-isomer | ||
| 2-amino-6-chloropurine | 6-chloroguanine : An organochlorine compound that is 7H-purin-2-amine substituted by a chloro group at position 6. 6-chloroguanine: an antimalarial that inhibits hypoxanthine-guanine-xanthine phosphoribosyltransferase; structure in first source | 2-aminopurines; organochlorine compound | |
| Norartocarpetin | flavones | ||
| gw-5074 | |||
| 4-(3-(1-adamantyl)-4-hydroxyphenyl)-3-chlorocinnamic acid | |||
| dysidiolide | dysidiolide: inhibits the protein tyrosine phosphatase CDC25; cladocoran B is the olefinic regioisomer; structure in first source | ||
| Dihydrotanshinone I | dihydrotanshinone I: extracted from Radix Salviae | abietane diterpenoid | anticoronaviral agent |
| cudraflavanone a | cudraflavanone A: antineoplastic from Cudrania tricuspidata; structure in first source | ||
| 3-(1-(3-(biphenyl-4-ylamino)-3-oxopropyl)-1h-1,2,3-triazol-4-yl)-6-hydroxy-1-methyl-2-phenyl-1h-indole-5-carboxylic acid | 3-(1-(3-(biphenyl-4-ylamino)-3-oxopropyl)-1H-1,2,3-triazol-4-yl)-6-hydroxy-1-methyl-2-phenyl-1H-indole-5-carboxylic acid: an SHP2 inhibitor; structure in first source | ||
| rk 682 |