Stereo- and regiospecificity of yeast phytases–chemical synthesis and enzymatic conversion of the substrate analogues neo- and l-chiro-inositol hexakisphosphate
作者:Stephan Adelt、Michael Podeschwa、Guido Dallmann、Hans-Josef Altenbach、Günter Vogel
DOI:10.1016/s0045-2068(02)00523-0
日期:2003.2
trisphosphate level, including the absolute configuration of the intermediates. Stereoselective assignment of the myo-inositol pentakisphosphates (D-myo-inositol 1,2,4,5,6-pentakisphosphate and D-myo-inositol 1,2,3,4,5-pentakisphosphate) generated was accomplished by a new method based on enantiospecific enzymatic conversion and HPLC analysis. Via conduritol B or E derivatives the total syntheses of
植酸酶是催化肌醇六磷酸(植酸)中磷酸酯水解的酶。已经研究了酵母菌株酿酒酵母和罗丹毕赤酵母的植酸酶进行的酶促去磷酸化的精确途径,直至肌醇三磷酸水平,包括中间体的绝对构型。通过一种新方法完成了生成的肌醇五磷酸磷酸酯(D-肌醇1,2,4,5,6-五磷酸磷酸酯和D-肌醇1,2,3,4,5-五磷酸磷酸酯)的立体选择性分配。基于对映体特异性酶促转化和HPLC分析。通过conduritol B或E衍生物,合成肌醇六磷酸磷酸酯的两个差向异构体,进行了新肌醇六磷酸酯和L-手性肌醇六磷酸酯的研究,以检验酵母植酸酶与这些底物类似物的特异性。动力学数据和确定的降解途径的比较给出了有关酶对肌醇六磷酸磷酸酯分子识别的初步提示。利用新的和L-手性肌醇六磷酸酯的去磷酸化过程中观察到的高立体和区域特异性,可以为合成D-新肌醇1,2,5,6-四磷酸酯建立酶辅助步骤, L-手性肌醇1,2,3,5,6-五磷酸和L-手性肌醇1,2