Facile enzymic de novo synthesis and NMR spectroscopic characterization of d-tagatose 1,6-bisphosphate
作者:Oliver Eyrisch、Gudrun Sinerius、Wolf-Dieter Fessner
DOI:10.1016/0008-6215(93)87020-s
日期:1993.1
Abstract A d -tagatose 1,6-bisphosphate aldolase requiring Zn 2+ for catalytic activity (class II) was purified from E. coli cells grown on galactitol. The aldolase, a homotetramer composed of subunits of mol wt ∼ 28 000, had a pH optimum at 7.5 and was highly selective for l - erythro as compared to d - threo stereochemistry (99:1). This allowed its application in a coupled enzyme system together
摘要从半乳糖醇上生长的大肠杆菌细胞中纯化了需要Zn 2+催化活性的d-塔格糖1,6-二磷酸醛缩酶(Ⅱ类)。醛缩酶是由mol wt〜28000的亚基组成的同型四聚体,其最适pH为7.5,与d-苏式立体化学(99:1)相比,对l-erythro具有高度选择性。这使得它可以与甘油激酶,丙酮酸激酶和磷酸三糖异构酶一起用于偶联酶系统中,从头开始,从二羟基丙酮和磷酸烯醇丙酮酸开始一锅合成d-塔格糖1,6-二磷酸酯(用于原位再生)。量为10 mmol的三磷酸腺苷)。快速的过程与已知的多步化学制备方法相比,在简单性和产率(总产率为40%)方面具有非常好的优势,即使在本工作中对后者进行了改进之后也是如此。在两个磷酸化步骤中都修饰了从d-半乳糖醛酸开始的经典序列:通过应用三价磷酸化试剂二苄基di-N-来酯化1,2:3,4-二-O-异亚丙基-d-塔基呋喃糖。乙基亚磷酰胺随后进行过氧化氢氧化,并且将细菌果糖6-磷