Information on EC - hydantoin racemase

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EC Tree
     5 Isomerases
         5.1 Racemases and epimerases
             5.1.99 Acting on other compounds
       hydantoin racemase
IUBMB Comments
This enzyme, along with N-carbamoylase (EC and EC and hydantoinase, forms part of the reaction cascade known as the "hydantoinase process", which allows the total conversion of D,L-5-monosubstituted hydantoins into optically pure D- or L-amino acids . The enzyme from Pseudomonas sp. (HyuE) has a preference for hydantoins with aliphatic substituents, e.g. D- and L-5-[2-(methylsulfanyl)ethyl]hydantoin, whereas that from Arthrobacter aurescens shows highest activity with arylalkyl substituents, especially 5-benzylhydantoin, at the 5-position . In the enzyme from Sinorhizobium meliloti, Cys76 is responsible for recognition and proton retrieval of D-isomers, while Cys181 is responsible for L-isomer recognition and racemization .
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The expected taxonomic range for this enzyme is: Bacteria, Archaea
5'-monosubstituted-hydantoin racemase, hydantoin racemase, HyuA, HyuE, more
D-5-monosubstituted hydantoin = L-5-monosubstituted hydantoin
show the reaction diagram
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