| methylthioinosine | <chemical> 6-(methylthio)-9-beta-d-ribofuranosylpurine. An analog of inosine with a methylthio group replacing the hydroxyl group in the 6-position. Chemical name: Inosine, 6-S-methyl-6-thio- (12 Dec 1998) |
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| methylthiolase | <enzyme> Catalyses the cleavage of the methylthio group from 5-methylthioribose-1-phosphate Chemical name: 5-methylthioribose-1-phosphate methylthiolase Registry number: EC 3.3.1.- (26 Jun 1999) |
| methylthiouracil | <chemical> A thiourea antithyroid agent that inhibits the synthesis of thyroid hormone. It is used in the treatment of hyperthyroidism. Pharmacological action: antithyroid agents. Chemical name: 4(1H)-Pyrimidinone, 2,3-dihydro-6-methyl-2-thioxo- (12 Dec 1998) |
| methyltocol | A methylated tocol; e.g., tocotrienol, the tocopherols. (05 Mar 2000) |
| methyltransferase | <enzyme> That transfers a methyl group from S adenosyl methionine to a substrate. most commonly encountered in bacterial chemotaxis where the methyl accepting chemotaxis proteins (MCPs) become methylated in the course of adaptation. (18 Nov 1997) |
| methyltransferases | <enzyme> A subclass of enzymes of the transferase class that catalyze the transfer of a methyl group from one compound to another. Registry number: EC 2.1.1. (12 Dec 1998) |
| methyltyrosines | A group of compounds that are methyl derivatives of the amino acid tyrosine. (12 Dec 1998) |
| methylumbelliferone sulfatase | <enzyme> Used as test substrate for arylsulfatases Registry number: EC 3.1.6.- Synonym: 4-methylumbelliferone sulfate sulfatase (26 Jun 1999) |
| methylurea compounds | Urea compounds which are substituted with one or more methyl groups. (12 Dec 1998) |
| methylxanthines | A chemical group of drugs derived from xanthine (a purine derivative); members of the group include theophylline, caffeine, and theobromine. (05 Mar 2000) |