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S-Adenosyl methionine (SAM), also known under the commercial names of SAMe, SAM-e, or AdoMet, is a common cosubstrate involved in methyl group transfers, transsulfuration, and aminopropylation. Although these anabolic reactions occur throughout the body, most SAM is produced and consumed in the liver. [ 1 ]
S-adenosyl methionine (SAM) is the precursor to 5′-methylthioadenosine. The pervasive cofactor S-adenosyl methionine (SAM) is the precursor to 5′-methylthioadenosine. The sulfonium group in SAM can cleave in three ways, one involves loss of CH 2 CH 2 CH(NH 3 +)CO 2 −, generating the title compound.
S-Adenosylmethioninamine is a substrate that is required for the biosynthesis of polyamines including spermidine, spermine, and thermospermine. [1] It is produced by decarboxylation of S -adenosyl methionine .
As of 2001, 645 unique radical SAM enzymes have been identified from 126 species in all three domains of life. [4] According to the EFI and SFLD databases, more than 220,000 radical SAM enzymes are predicted to be involved in 85 types of biochemical transformations.
S-Methylmethionine (SMM) is a derivative of methionine with the chemical formula (CH 3) 2 S + CH 2 CH 2 CH(NH 3 +)CO 2 −. This cation is a naturally-occurring intermediate in many biosynthetic pathways owing to the sulfonium functional group. It is biosynthesized from L-methionine and S-adenosylmethionine by the enzyme methionine S ...
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 .
The systematic name of this enzyme class is S-adenosyl-L-methionine hydrolase. Other names in common use include S-adenosylmethionine cleaving enzyme , methylmethionine-sulfonium-salt hydrolase , and adenosylmethionine lyase .
Thus, the two substrates of this enzyme are S-adenosyl methionine and myelin basic protein-arginine, whereas its two products are S-adenosylhomocysteine and myelin basic protein-Nomega-methyl-arginine. This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases.
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