Page last updated: 2024-10-24
methylosome
Definition
Target type: cellularcomponent
A large (20 S) protein complex that possesses protein arginine methyltransferase activity and modifies specific arginines to dimethylarginines in the arginine- and glycine-rich domains of several spliceosomal Sm proteins, thereby targeting these proteins to the survival of motor neurons (SMN) complex for assembly into small nuclear ribonucleoprotein (snRNP) core particles. Proteins found in the methylosome include the methyltransferase JBP1 (PRMT5), pICln (CLNS1A), MEP50 (WDR77), and unmethylated forms of SM proteins that have RG domains. [PMID:11713266, PMID:11756452]
The methylosome is a multi-protein complex involved in DNA methylation in eukaryotes. It comprises several key components, including DNA methyltransferases (DNMTs), which catalyze the transfer of a methyl group from S-adenosyl methionine (SAM) to cytosine bases in DNA. The methylosome also includes a number of other proteins that contribute to its stability, substrate recognition, and regulation.
The cellular component of the methylosome is largely localized to the nucleus, specifically associating with chromatin. This association allows the methylosome to directly access DNA and perform its methylation functions. The methylosome can be found both at euchromatin, the less tightly packed form of chromatin, and heterochromatin, the more condensed form. Its presence at both regions reflects its role in regulating diverse aspects of DNA function, including gene expression, replication, and repair.
The methylosome is a dynamic complex, constantly assembling and disassembling based on cellular needs and signaling. The specific composition of the methylosome can vary depending on cell type, developmental stage, and even environmental conditions. This dynamic nature ensures appropriate regulation of DNA methylation patterns in response to various cellular cues.'
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Proteins (4)
| Protein | Definition | Taxonomy |
|---|---|---|
| 4-galactosyl-N-acetylglucosaminide 3-alpha-L-fucosyltransferase FUT6 | A 4-galactosyl-N-acetylglucosaminide 3-alpha-L-fucosyltransferase FUT6 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P51993] | Homo sapiens (human) |
| Methylosome protein 50 | A methylosome protein WDR77 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9BQA1] | Homo sapiens (human) |
| Protein arginine N-methyltransferase 1 | A protein arginine N-methyltransferase 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q99873] | Homo sapiens (human) |
| Protein arginine N-methyltransferase 5 | A protein arginine N-methyltransferase 5 that is encoded in the genome of human. [PRO:DNx, UniProtKB:O14744] | Homo sapiens (human) |
Compounds (33)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| 2,3-dihydroxybenzoic acid | 2,3-dihydroxybenzoic acid : A dihydroxybenzoic acid that is benzoic acid substituted by hydroxy groups at positions 2 and 3. It occurs naturally in Phyllanthus acidus and in the aquatic fern Salvinia molesta. 2,3-dihydroxybenzoic acid: RN given refers to parent cpd dihydroxybenzoic acid : Any member of the class of hydroxybenzoic acids carrying two phenolic hydroxy groups on the benzene ring and its derivatives. | dihydroxybenzoic acid | human xenobiotic metabolite; plant metabolite |
| protocatechuic acid | 3,4-dihydroxybenzoic acid : A dihydroxybenzoic acid in which the hydroxy groups are located at positions 3 and 4. protocatechuic acid: RN given refers to parent cpd; structure | catechols; dihydroxybenzoic acid | antineoplastic agent; EC 1.1.1.25 (shikimate dehydrogenase) inhibitor; EC 1.14.11.2 (procollagen-proline dioxygenase) inhibitor; human xenobiotic metabolite; plant metabolite |
| 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 |
| beta-resorcylic acid | beta-resorcylic acid: RN given refers to parent cpd; structure | ||
| fluorescite | fluorescein (acid form) : A xanthene dye that is highly fluorescent and commonly used as a fluorescent tracer. | benzoic acids; cyclic ketone; hydroxy monocarboxylic acid; organic heterotricyclic compound; phenols; xanthene dye | fluorescent dye; radioopaque medium |
| 2,5-dihydroxybenzoic acid | 2,5-dihydroxybenzoic acid : A dihydroxybenzoic acid having the two hydroxy groups at the 2- and 5-positions. 2,5-dihydroxybenzoic acid: RN given refers to parent cpd; a oxidative product of saligenin | dihydroxybenzoic acid | EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor; fungal metabolite; human metabolite; MALDI matrix material; mouse metabolite |
| pentamidine | pentamidine : A diether consisting of pentane-1,5-diol in which both hydroxyl hydrogens have been replaced by 4-amidinophenyl groups. A trypanocidal drug that is used for treatment of cutaneous leishmaniasis and Chagas disease. Pentamidine: Antiprotozoal agent effective in trypanosomiasis, leishmaniasis, and some fungal infections; used in treatment of PNEUMOCYSTIS pneumonia in HIV-infected patients. It may cause diabetes mellitus, central nervous system damage, and other toxic effects. | aromatic ether; carboxamidine; diether | anti-inflammatory agent; antifungal agent; calmodulin antagonist; chemokine receptor 5 antagonist; EC 2.3.1.48 (histone acetyltransferase) inhibitor; NMDA receptor antagonist; S100 calcium-binding protein B inhibitor; trypanocidal drug; xenobiotic |
| saccharin | saccharin : A 1,2-benzisothiazole having a keto-group at the 3-position and two oxo substituents at the 1-position. It is used as an artificial sweetening agent. Saccharin: Flavoring agent and non-nutritive sweetener. | 1,2-benzisothiazole; N-sulfonylcarboxamide | environmental contaminant; sweetening agent; xenobiotic |
| suramin | suramin : A member of the class of phenylureas that is urea in which each of the amino groups has been substituted by a 3-({2-methyl-5-[(4,6,8-trisulfo-1-naphthyl)carbamoyl]phenyl}carbamoyl)phenyl group. An activator of both the rabbit skeletal muscle RyR1 and sheep cardiac RyR2 isoform ryanodine receptor channels, it has been used for the treatment of human African trypanosomiasis for over 100 years. Suramin: A polyanionic compound with an unknown mechanism of action. It is used parenterally in the treatment of African trypanosomiasis and it has been used clinically with diethylcarbamazine to kill the adult Onchocerca. (From AMA Drug Evaluations Annual, 1992, p1643) It has also been shown to have potent antineoplastic properties. | naphthalenesulfonic acid; phenylureas; secondary carboxamide | angiogenesis inhibitor; antinematodal drug; antineoplastic agent; apoptosis inhibitor; EC 2.7.11.13 (protein kinase C) inhibitor; GABA antagonist; GABA-gated chloride channel antagonist; purinergic receptor P2 antagonist; ryanodine receptor agonist; trypanocidal drug |
| alizarin | dihydroxyanthraquinone | chromophore; dye; plant metabolite | |
| 7-amino-4-hydroxy-2-naphthalenesulfonic acid | 7-amino-4-hydroxy-2-naphthalenesulfonic acid : An aminonaphthalenesulfonic acid that is 2-naphthalenesulfonic acid substituted by an amino group at position 7 and a hydroxy group at position 4 respectively. 7-amino-4-hydroxy-2-naphthalenesulfonic acid: structure given in first source | aminonaphthalenesulfonic acid; naphthols | metabolite |
| 1-naphthol-8-amino-3,6-disulfonic acid | 1-naphthol-8-amino-3,6-disulfonic acid: dye and found in industrial waste | ||
| veratric acid | 3,4-dimethoxybenzoic acid : A member of the class of benzoic acids that is benzoic acid substituted by methoxy groups at positions 2 and 3. veratric acid: RN given refers to parent cpd; structure | benzoic acids | allergen; plant metabolite |
| methyl gallate | methyl 3,4,5-trihydroxybenzoate : A gallate ester obtained by the formal condensation of gallic acid with methanol. It exhibits anti-oxidant, anti-tumor, anti-microbial and anti-inflammatory properties. methyl gallate: has both immunosuppressive and phytogenic antineoplastic activities; isolated from Acer saccharinum | gallate ester | anti-inflammatory agent; antioxidant; plant metabolite |
| 3,4,5-trimethoxybenzoic acid | 3,4,5-trimethoxybenzoic acid : A benzoic acid derivative carrying 3-, 4- and 5-methoxy substituents. 3,4,5-trimethoxybenzoic acid: RN given refers to parent cpd; structure | benzoic acids; methoxybenzenes | human urinary metabolite; human xenobiotic metabolite; plant metabolite |
| methyl red | methyl red : An azo dye consisting of benzoic acid substituted at position 2 by a 4-[(dimethylamino)phenyl]diazenyl group. methyl red: RN given refers to parent cpd; structure | ||
| syringic acid | syringic acid : A dimethoxybenzene that is 3,5-dimethyl ether derivative of gallic acid. syringic acid: RN given refers to parent cpd; structure in third source | benzoic acids; dimethoxybenzene; phenols | plant metabolite |
| s-adenosylmethionine | acylcarnitine: structure in first source S-adenosyl-L-methioninate : A sulfonium betaine that is a conjugate base of S-adenosyl-L-methionine obtained by the deprotonation of the carboxy group. | sulfonium betaine | human metabolite |
| 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 |
| hexamidine | hexamidine : A polyether that is the bis(4-guanidinophenyl) ether of hexane-1,6-diol. | aromatic ether; guanidines; polyether | antimicrobial agent; antiseptic drug |
| sinefungin | adenosines; non-proteinogenic alpha-amino acid | antifungal agent; antimicrobial agent | |
| fluorone black | fluorone Black: structure | ||
| c.i. direct red 23 | C.I. Direct Red 23: azo dye; structure in first source | ||
| furamidine | furamidine: RN given refers to parent cpd; WR 199385 refers to di-HCl; pafuramidine is a prodrug of this | ||
| s-adenosylhomocysteine | S-adenosyl-L-homocysteine : An organic sulfide that is the S-adenosyl derivative of L-homocysteine. S-Adenosylhomocysteine: 5'-S-(3-Amino-3-carboxypropyl)-5'-thioadenosine. Formed from S-adenosylmethionine after transmethylation reactions. | adenosines; amino acid zwitterion; homocysteine derivative; homocysteines; organic sulfide | cofactor; EC 2.1.1.72 [site-specific DNA-methyltransferase (adenine-specific)] inhibitor; EC 2.1.1.79 (cyclopropane-fatty-acyl-phospholipid synthase) inhibitor; epitope; fundamental metabolite |
| 5'-methylthioadenosine | 5'-methylthioadenosine: structure 5'-S-methyl-5'-thioadenosine : Adenosine with the hydroxy group at C-5' substituted with a methylthio (methylsulfanyl) group. | thioadenosine | algal metabolite; Escherichia coli metabolite; human metabolite; mouse metabolite; Saccharomyces cerevisiae metabolite |
| stilbamidine | stilbamidine: RN given refers to parent cpd | ||
| mbx 1090 | |||
| epz004777 | N-glycosyl compound | ||
| gsk343 | GSK343 : A member of the class of indazoles that is 1-isopropyl-1H-indazole-4-carboxamide in which the nitrogen of the carboxamide group is substituted by a (6-methyl-2-oxo-4-propyl-1,2-dihydropyridin-3-yl)methyl group and in which the indazole ring is substituted at position 6 by a 2-(4-methylpiperazin-1-yl)pyridin-4-yl group. A highly potent and selective EZH2 inhibitor (IC50 = 4 nM). GSK343: an EZH2 methyltransferase inhibitor | aminopyridine; indazoles; N-alkylpiperazine; N-arylpiperazine; pyridone; secondary carboxamide | antineoplastic agent; apoptosis inducer; EC 2.1.1.43 (enhancer of zeste homolog 2) inhibitor |
| 6,7-dimethoxy-2-(pyrrolidin-1-yl)-n-(5-(pyrrolidin-1-yl)pentyl)quinazolin-4-amine | 6,7-dimethoxy-2-(pyrrolidin-1-yl)-N-(5-(pyrrolidin-1-yl)pentyl)quinazolin-4-amine: a SETD8 inhibitor; structure in first source | ||
| gsk3235025 | GSK3235025: an inhibitor of protein arginine methyltransferase-5 (PRMT5); structure in first source | ||
| guanosine diphosphate | Guanosine Diphosphate: A guanine nucleotide containing two phosphate groups esterified to the sugar moiety. | guanosine 5'-phosphate; purine ribonucleoside 5'-diphosphate | Escherichia coli metabolite; mouse metabolite; uncoupling protein inhibitor |