Synthesis, ligand binding and biomimetic oxidations of deuterohaemin modified with an undecapeptide residue
作者:Luigi Casella、Michele Gullotti、Luca De Gioia、Enrico Monzani、Francesco Chillemi
DOI:10.1039/dt9910002945
日期:——
sixth iron co-ordination position. The complex exhibits both catalase and peroxidase activity towards reducing substrates in the presence of hydrogen peroxide. In catalytic sulphoxidations of a series of para-substituted thioanisoles, p-XC6H4SMe, by hydrogen peroxide a good correlation has been found between the relative rates and the Hammett σp values, indicating that direct oxygen transfer from the
氘代人血红素[(3,7,12,17-四甲基卟啉-2,18-二丙酰氨基)铁(III)]已与十一肽Ala-Phe-Ser-Phe-Glu-Ala-Gln-Gly-Gly-Leu共价连接在丙酸侧链之一上的-Ala。生成的氘代人血红素-十一肽复合物与咪唑之间的结合平衡发生在两个步骤中。配体的第一个分子以高亲和力结合(K 1 = 1500 dm 3 mol –1),而第二个分子的亲和力则显着降低(K 2 = 220 dm 3 mol –1)),表明单咪唑加合物中肽链的折叠严重限制了第六个铁配位位置的可及性。在过氧化氢的存在下,该复合物对还原性底物表现出过氧化氢酶和过氧化物酶活性。在一系列的催化sulphoxidations对-取代的苯甲硫醚,p -XC 6 ħ 4 SME,通过过氧化氢有良好的相关已发现的相对速率和哈米特σ之间p值,表明从活性氧合铁物种到硫化物的直接氧气转移可能是有效的。还研究了在配