Add time:09/08/2019         Source:sciencedirect.com

The d-methionine- and 2-methyl-dl-methionine analogs of the enzymatic methyl donor, (−)S-adenosyl-l-methionine, were synthesized by methylation of S-adenosyl-d-homocysteine and S-adenosyl-2-methyl-dl-homocysteine with methyl iodide. By chromatographic purification, S-adenosyl-d-methionine and S-adenosyl-2-methyl-dl-methionine were obtained. The structure of the latter was ascertained by hydrolysis to 2-methylmethionine in strong acid, and to 5′-methylthioadenosine and 2-methylhomoserine at pH 4. Reference material of the latter compound was obtained by alkaline hydrolysis of 2-methylmethionine methylsulfonium iodide. The sulfonium compounds were tested as methyl donors with N-acetylserotonin O-methyltransferase, l-homocysteine S-methyltransferase, histamine N-methyltransferase, and guanidinoacetate N-methyltransferase. In most instances, methyl donor activity was observed.

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