Studies of iron(ii) and iron(iii) complexes with fac-N2O, cis-N2O2 and N2O3 donor ligands: models for the 2-His 1-carboxylate motif of non-heme iron monooxygenases
作者:Patrick J. Cappillino、John R. Miecznikowski、Laurie A. Tyler、Paul C. Tarves、Joshua S. McNally、Wayne Lo、Bala Sundari T. Kasibhatla、Matthew D. Krzyaniak、John McCracken、Feng Wang、William H. Armstrong、John P. Caradonna
DOI:10.1039/c2dt11096b
日期:——
in the oxygen-activating class of mononuclear non-heme iron oxygenases (MNOs) contain a highly conserved iron center facially ligated by two histidine nitrogen atoms and one carboxylate oxygen atom that leave one face of the metal center (three binding sites) open for coordination to cofactor, substrate, and/or dioxygen. A comparative family of [FeII/III(N2On)(L)4−n)]±x, n = 1–3, L = solvent or Cl−
单核非血红素铁氧合酶(MNOs)的氧激活类别中的酶包含高度保守的铁中心,其表面被两个人连接 组氨酸离开金属中心一个表面(三个结合位点)的氮原子和一个羧基氧原子开放,以与辅因子,底物和/或双氧进行配位。的的[Fe比较家族II / III(N 2 ö Ñ)(L)4- Ñ)] ± X,Ñ = 1-3,L =溶剂或Cl - ,模型复合物,基于配位体系列,支持经表面连接的N,N,O核,然后经过修饰以包含一个或两个附加的羧酸盐螯合臂,已在结构和光谱上得到了表征。EPR研究表明,高转速d 5Fe III g = 4.3信号随着整个系列Fe(N 2 O 3),Fe(N 2 O 2)和Fe(N 2 O 1)上羧酸盐配体数量的减少而变得更加对称,反映了E的增加随着可交换/溶剂配位点数量的增加,这些络合物的/ D应变增加,这与有助于谱线形状的电子结构分布的增强平行。Fe II -Fe III中观察到的系统变化氧