Mimosinase
class of enzymes
Mimosinase (EC 4.3.3.8) is an enzyme characterised from Leucaena leaves that catalyzes the overall chemical reaction which converts mimosine to 3-hydroxypyridin-4(1H)-one (a tautomer of 3,4-dihydroxypyridine), pyruvic acid, and ammonia:
The enzyme contains pyridoxal phosphate and the first step of the reaction breaks the bond between the pyridinone nitrogen and the sidechain, which at first forms an unstable enamine derivative. This is then hydrolysed to pyruvic acid and ammonia.
This enzyme is a carbon-nitrogen lyase.
Occurrence
Known to occur in all Leucaena and Mimosa species of plant. The synthase found in L. leucocephala has been cloned.
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This entry incorporates text from “Mimosinase” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.