化学
电泳剂
硫
硫黄
立体化学
激进的
氨基酸
核苷
氢原子萃取
催化作用
组合化学
有机化学
生物化学
盐(化学)
作者
Marc Fontecave,Mohamed G. Atta,Etienne Mulliez
标识
DOI:10.1016/j.tibs.2004.03.007
摘要
S-adenosylmethionine (SAM or AdoMet) is a biological sulfonium compound known as the major biological methyl donor in reactions catalyzed by methyltransferases. SAM is also used as a source of methylene groups (in the synthesis of cyclopropyl fatty acids), amino groups (in the synthesis of 7,8-diaminoperlagonic acid, a precursor of biotin), ribosyl groups (in the synthesis of epoxyqueuosine, a modified nucleoside in tRNAs) and aminopropyl groups (in the synthesis of ethylene and polyamines). Even though the mechanism of most of these reactions has not been extensively characterized, it is likely that the chemistry at work is mainly driven by the electrophilic character of the carbon centers that are adjacent to the positively charged sulfur atom of SAM. In addition, SAM, upon one-electron reduction, is a source of 5'-deoxyadenosyl radicals, which initiate many metabolic reactions and biosynthetic pathways by hydrogen-atom abstraction. SAM presents a unique situation in which all constituent parts have a chemical use.
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