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|Section2= |Section3= }} Dehydroalanine (Cα,β-didehydroalanine, (alpha)-(beta)-di-dehydroalanine, or 2,3-didehydroalanine) is a dehydroamino acid. It is an α-amino acid found as a residue in peptides of microbial origin. It is unusual in having an unsaturated backbone.〔Dawid Siodłak "α,β-Dehydroamino Acids in Naturally Occurring Peptides" Amino Acids 2015, vol. 47, pp. 1–17. .〕 ==Structure and reactivity== As a primary enamine, dehydroalanine is unstable with respect to tautomerization. It therefore can only exist as a residue in a peptide. Because of its unsaturated side chain, dehydroalanine only exists as a single isomer. Despite its name, it is not derived from alanine. Instead it arises via a post transcriptional modification of serine and cysteine. These amino acids, as residues in peptides and proteins, undergo enzymatical loss of water and hydrogen sulfide, respectively. Generally amino acid residues are unreactive toward nucleophiles, but those containing dehydroalanine (like some other dehydroamino acids) are exceptions.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dehydroalanine」の詳細全文を読む スポンサード リンク
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