| methionine synthase | Tetrahydropteroylglutamate methyltransferase; methionine-homocysteine methyltransferase;an enzyme that catalyses the reaction of N5-methyltetrahydrofolate with l-homocysteine to form tetrahydrofolate and l-methionine; a cobalamin-requiring enzyme; a deficiency of this enzyme results in an accumulation of l-homocysteine and neurological abnormalities. Synonym: tetrahydrofolate methyltransferase. (05 Mar 2000) |
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| methionine-trna ligase | <enzyme> An enzyme that activates methionine with its specific transfer RNA. Chemical name: L-Methionine:tRNA(Met) ligase (AMP-forming) Registry number: EC 6.1.1.10 (12 Dec 1998) |
| cytochrome C-methionine methyltransferase | <enzyme> Forms s-methylmethionine Registry number: EC 2.1.1.- Synonym: cyt c-met methyltransferase (26 Jun 1999) |
| S-adenosyl-l-methionine | S-(5'-deoxy-5'-adenosyl)-l-methionine;condensation product of adenosine and l-methionine involving replacement of the -OPO3H2 of adenylic acid by -S+ (CH3)CH2CH2CH(NH3+)CO 2 of methionine; a sulfonium compound bearing a methyl group that is transferred in transmethylation reactions. See: methionine adenosyltransferase. Synonym: active methionine. Acronym: SAM (05 Mar 2000) |
| S-adenosyl-L-methionine-2-octaprenyl-3-methyl-5-hydroxy-6-methoxy-1,4-benzoquinone-O-methyltransferase | <enzyme> Proposed pathway for final reaction in ubiquinone biosynthesis. Registry number: EC 2.1.1.- Synonym: 2-octaprenyl-3-methyl-5-hydroxy-6-methoxy-1,4-benzoquinone methyltransferase, ubig gene product, ubig protein (26 Jun 1999) |
| S-adenosyl-L-methionine-macrocin O-methyltransferase | <enzyme> Requires mg(ii) and s-adenosyl-l-methionine; specifically converts macrocin to tylosin by o-methylation at 3'''-position of macrocin Registry number: EC 2.1.1.- Synonym: macrocin o-methyltransferase, macrocin o-mt (26 Jun 1999) |
| S-adenosyl-L-methionine-norcoclaurine 6-O-methyltransferase | <enzyme> Catalyses the transfer of the s-methyl group of s-adenosyl-l-methionine to the 6-hydroxy group of norcoclaurine to produce coclaurine toward the synthesis of berberine in coptis japonica Registry number: EC 2.1.1.- Synonym: norcoclaurine 6-o-methyltransferase (26 Jun 1999) |
| S-adenosyl-L-methionine - scoulerine-9-O-methyltransferase | <enzyme> Catalyses the transfer of the s-methyl group of s-adenosyl-l-methionine to the 9-hydroxyl group of scoulerine during the biosynthesis of berberine; from cultured cells of coptis japonica; genbank d29809 Registry number: EC 2.1.1.- Synonym: adenosyl-met-smt, scoulerine 9-o-methyltransferase (26 Jun 1999) |
| S-adenosyl methionine thioether S-methyltransferase | <enzyme> 30,000 da enzyme methylates selenium in dimethylselenide, tellurium in dimethyltelluride, sulfur in dimethylsulfide and other thio ethers. Registry number: EC 2.1.1.- Synonym: dimethyl selenide methyltransferase, thioether methyltransferase (26 Jun 1999) |
| enkephalin, methionine | <chemical> Endogenous pentapeptide with morphine-like activity. The amino acid in position 5 is methionine. Chemical name: Adrenorphin (human), 6-de-L-arginine-7-de-L-arginine-8-de-L-valinamide- (12 Dec 1998) |
| L-methionine gamma-lyase | <enzyme> Pharmacological action: antimetabolites, antineoplastic Registry number: EC 4.4.1.11 Synonym: l-methionine alpha-deamino gamma-mercaptomethane-lyase, methionine dethiomethylase, l-methioninase, methioninase (26 Jun 1999) |