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    • 68. 发明申请
    • D-AMINOACYLASE
    • D-氨基酸
    • US20120149071A1
    • 2012-06-14
    • US13345399
    • 2012-01-06
    • Kimiyasu IsobeSeiki Yamaguchi
    • Kimiyasu IsobeSeiki Yamaguchi
    • C12N9/80C12N1/20C12P13/04C12N1/21C12N15/55C12N15/74
    • C12N9/80
    • A D-aminoacylase having a high substrate specificity is provided. This D-aminoacylase can produce D-amino acids from N-acetyl-D,L-amino acids conveniently and efficiently at a low cost.A D-aminoacylase produced by a microorganism of genus Defluvibacter; which acts on a N-acetyl-D-amino acid; which has a molecular weight (as determined by electrophoresis) of about 55,000 daltons, and an isoelectric point (as determined by two-dimensional electrophoresis for denatured system) of 5.3; which acts on N-acetyl-D-valine, N-acetyl-D-leucine, and the like, but not on N-acetyl-L-valine, N-acetyl-L-leucine, and the like; which has an optimal temperature of 37° C. (pH 8) and an optimal pH value of 8 to 8.5 at 37° C.; and whose activity is inhibited by Mn2+, Co2+, Ni2+, and Zn2+ each at 1 mmol/L, and by dithiothreitol, 2-mercaptoethanol, o-phenanthroline, and L-cysteine each at 5 mmol/L.
    • 提供了具有高底物特异性的D-氨基酸酰化酶。 该D-氨基酸酶可以以低成本方便且有效地从N-乙酰基-D,L-氨基酸产生D-氨基酸。 由去纤维杆菌属的微生物产生的D-氨基酸酰化酶; 其作用于N-乙酰基-D-氨基酸; 其具有约55,000道尔顿的分子量(通过电泳测定)和5.3的等电点(通过用于变性体系的二维电泳测定); 其作用于N-乙酰基-D-缬氨酸,N-乙酰基-D-亮氨酸等,但不适用于N-乙酰基-L-缬氨酸,N-乙酰基-L-亮氨酸等; 其最适温度为37℃(pH8),最适pH值为8〜8.5,在37℃下。 Mn2 +,Co2 +,Ni2 +和Zn2 +各自以1 mmol / L的速度抑制其活性,二硫苏糖醇,2-巯基乙醇,邻菲咯啉和L-半胱氨酸各自以5 mmol / L的速度进行抑制。