Remote Effects Modulating the Spin Equilibrium of the Resting State of Cytochrome P450cam –An Investigation Using Active Site Analogues
作者:Martin Lochner、Linjing Mu、Wolf-D. Woggon
DOI:10.1002/adsc.200303011
日期:2003.6
structure of the resting state of cytochrome P450cam (CYP101), a heme thiolate protein, shows a cluster of six water molecules in the substrate binding pocket, one of which is coordinating to iron(III) as sixth ligand. The resting state is low-spin and changes to high-spin when substrate camphor binds and H2O is removed. In contrast to the protein, previously synthesised enzyme models such as H2OFeIII(porph)(ArS−)
细胞色素P450 cam(CYP101)的静止状态的晶体结构是一种血红素硫醇盐蛋白,在底物结合袋中显示出六个水分子簇,其中一个与六价铁(III)配位。静止状态为低旋转,当底物樟脑结合并去除H 2 O时,其变为高旋转。与此相反的蛋白质,预先合成的酶的模型,例如H 2 OFE III(porph)(ARS - )被证明是纯高自旋。铁(S - )与不同远端站点模仿提出远程效应卟啉已经准备和CW-EPR研究。结果表明,P450凸轮处于静止状态的低速旋转是由于这样的事实,即水分子配位于铁具有的OH -因为水簇的氢键和偏振的样字符,分别。