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- W2077190464 abstract "In Arthrobacter aurescens DSM 3747 three enzymes are involved in the complete conversion of slowly racemizing 5′-monosubstituted d,l-hydantoins to l-amino acids, a stereoselective hydantoinase, a stereospecific l-N-carbamoylase and a hydantoin racemase. The gene encoding the hydantoin racemase, designated hyuA, was identified upstream of the previously described l-N-carbamoylase gene in the plasmid pAW16 containing genomic DNA of A. aurescens. The gene hyuA which encodes a polypeptide of 25.1 kDa, was expressed in Escherichia coli and the recombinant protein purified to homogeneity and further characterized. The optimal condition for racemase activity were pH 8.5 and 55°C with l-5-benzylhydantoin as substrate. The enzyme was completely inhibited by HgCl2 and iodoacetamide and stimulated by addition of dithiothreitol. No effect on enzyme activity was seen with EDTA. The enzyme showed preference for hydantoins with arylalkyl side chains. Kinetic studies revealed substrate inhibition towards the aliphatic substrate l-5-methylthioethylhydantoin. Enzymatic racemization of d-5-indolylmethylenehydantoin in D2O and NMR analysis showed that the hydrogen at the chiral center of the hydantoin is exchanged against solvent deuterium during the racemization." @default.
- W2077190464 created "2016-06-24" @default.
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- W2077190464 date "2000-07-01" @default.
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- W2077190464 title "Hydantoin racemase from Arthrobacter aurescens DSM 3747: heterologous expression, purification and characterization" @default.
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- W2077190464 doi "https://doi.org/10.1016/s0168-1656(00)00262-5" @default.
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