Enzymes that catalyze the formation of (S)-allantoin from the product of the urate oxidase reaction have been identified. This finding answers the longstanding question of how living organisms produce a single enantiomer of allantoin.
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Tipton, P. Urate to allantoin, specifically (S)-allantoin. Nat Chem Biol 2, 124–125 (2006). https://doi.org/10.1038/nchembio0306-124
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DOI: https://doi.org/10.1038/nchembio0306-124
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