The present invention provides a method of producing optically active amino acids from 5-substituted hydantoin by isolating a hydantoinase gene and an N-carbamyl-L-amino acid hydrolase gene involved in an ability to convert 5-substituted hydantoin or N-carbamylamino acid into optically active amino acids from a microorganism of the genus Microbacterium having the above ability and by improving gene amplification and transcriptional and translational activities thereby preparing a recombinant wherein the amount of the desired enzymes produced is increased. The hydantoinase gene is, for example, a DNA encoding for a protein having a hydantoinase activity, which has the nucleotide sequence set forth in SEQ ID NO:1 in the Sequence. The N-carbamyl-L-amino acid hydrolase gene is, for example, a DNA encoding for a protein having an N-carbamyl-L-amino acid hydrolase activity, which has the nucleotide sequence set forth in SEQ ID NO:3 in the Sequence.
本发明提供了一种从5-取代的海因中生产光学活性
氨基酸的方法,其方法是从具有上述能力的微细菌属微
生物中分离出一种参与将5-取代的海因或N-
氨甲酰-L-
氨基酸转化为光学活性
氨基酸的能力的海因酶
基因和N-
氨甲酰-L-
氨基酸水解酶
基因,并通过改进
基因扩增和转录及翻译活性从而制备出一种
重组体,在该
重组体中所产生的所需酶的量有所增加。例如, hydantoina
SE 基因是编码具有 hydantoina
SE 活性的蛋白质的 DNA,其核苷酸序列见序列
SEQ ID NO:1 所列。例如,N-
氨基甲酰-L-
氨基酸水解酶
基因是编码具有 N-
氨基甲酰-L-
氨基酸水解酶活性的蛋白质的 DNA,其核苷酸序列见序列
SEQ ID NO:3。