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ATP + L-methionine + H2O phosphate + diphosphate + S-adenosyl-L-methionine. The sulfonium functional group present in S-adenosyl methionine is the center of its peculiar reactivity. Depending on the enzyme, S-adenosyl methionine can be converted into one of three products:
The systematic name of this enzyme class is S-adenosyl-L-methionine:1D-myo-inositol 4-methyltransferase. Other names in common use include myo-inositol 4-O-methyltransferase , S-adenosyl-L-methionine:myo-inositol 4-O-methyltransferase , and myo-inositol 6-O-methyltransferase .
23S rRNA (adenosine 1067-2'-O)-methyltransferase (EC 2.1.1.230, 23S rRNA A1067 2'-methyltransferase, thiostrepton-resistance methylase, nosiheptide-resistance methyltransferase) is an enzyme with systematic name S-adenosyl-L-methionine:23S rRNA (adenosine 1067-2'-O)-methyltransferase.
2 S-adenosyl-L-methionine + adenine 2085 in 23S rRNA 2 S-adenosyl-L-homocysteine + N 6-dimethyladenine 2085 in 23S rRNA. ErmC is a methyltransferase that confers resistance to the macrolide-lincosamide-streptogramin B group of antibiotics by catalysing the methylation of 23S rRNA at adenine 2085.
The systematic name of this enzyme class is S-adenosyl-L-methionine:[myelin-basic-protein]-arginine Nomega-methyltransferase. Other names in common use include myelin basic protein methylase I , protein methylase I , S-adenosyl-L-methionine:[myelin-basic-protein]-arginine , and omega-N-methyltransferase .
The systematic name of this enzyme class is S-adenosyl-L-methionine:5,7,4'-trihydroxyflavone 4'-O-methyltransferase. Other names in common use include flavonoid O-methyltransferase, and flavonoid methyltransferase. This enzyme participates in flavonoid biosynthesis.
The systematic name of this enzyme class is S-adenosyl-L-methionine:calmodulin-L-lysine N6-methyltransferase. Other names in common use include S-adenosylmethionine:calmodulin (lysine) N-methyltransferase, and S-adenosyl-L-methionine:calmodulin-L-lysine 6-N-methyltransferase. This enzyme participates in lysine degradation.
The systematic name of this enzyme class is S-adenosyl-L-methionine:amine N-methyltransferase. Other names in common use include nicotine N-methyltransferase, tryptamine N-methyltransferase, indolethylamine N-methyltransferase, and arylamine N-methyltransferase. This enzyme participates in tryptophan metabolism.