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Dehydroalanine (Cα,β-didehydroalanine, (alpha)-(beta)-di-dehydroalanine, or 2,3-didehydroalanine) is a dehydroamino acid. It is a hypothetic molecule that does not exist except as a residue found as a residue in peptides of microbial origin. It is unusual in having an unsaturated backbone.[1]

Structural formula
Ball-and-stick model of the zwitterion
IUPAC name
2-Aminoprop-2-enoic acid
3D model (JSmol)
Molar mass 87.08 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references


Structure and reactivityEdit

As a primary enamine, dehydroalanine is unstable with respect to tautomerization. It therefore does exist, but N-acylated derivatives such as peptides and related compounds are stable.

Despite its name, it is not derived from alanine. Instead it arises via a post translational 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.[1]


The dehydroalanine residue was first detected in the cyclic antimicrobial peptide nisin.[1]

In food, DHA frequently alkylates lysine to yield the reactive lysinoalanine or N6-(DL-2-amino-2-carboxyethyl)-L-lysine, an unusual amino acid thought to cause kidney failure in rats, has been found in proteins of home-cooked and commercial foods and ingredients. Although it had been reported to occur in both edible and non-food proteins only after base treatment (such as occurs in soybean processing), it has also been identified in food proteins that had not been subjected to treatment. Lysinoalanine can also be generated in a variety of proteins when heated under non-alkaline conditions.

Many dehydroalanine-containing peptides are toxic or antibiotic.[which?] DHA is a component of lantibiotics and microcystins.

See alsoEdit


  1. ^ a b c Dawid Siodłak "α,β-Dehydroamino Acids in Naturally Occurring Peptides" Amino Acids 2015, vol. 47, pp. 1–17. doi:10.1007/s00726-014-1846-4.

CID 123991 from PubChem