Abstract
The d-hydantoinase gene of a wild strain of Agrobacterium tumefaciens BQL9 had 99.78% nucleotide sequence identity with other available Agrobacterium genes. The resulting amino acid sequence showed two important substitutions affecting two α-helixes in the secondary structure of the protein. The union of Mn2+ to the protein was essential for activating the enzyme and was independent of the temperature. d-Hydantoinase only was inactivated in the presence of 70 mM EDTA and at over 40 °C. The enzyme showed both hydantoinase and pyrimidinase activities, but only with the d-enantiomers of the substrates. Activity was greater for substrates with apolar groups in the number 5 carbon atom of the hydantoin. The native structure of the N-terminal end of this d-hydantoinase proved to be indispensable to its enzymatic activity.
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Clemente-Jiménez, J.M., Martínez-Rogríguez, S., Mingorance-Cazorla, L. et al. Catalytic analysis of a recombinant d-hydantoinase from Agrobacterium tumefaciens . Biotechnology Letters 25, 1067–1073 (2003). https://doi.org/10.1023/A:1024115220304
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DOI: https://doi.org/10.1023/A:1024115220304