A mononuclear iron(III) complex of a noncyclic tetradentate monoamido ligand, Fe(III)mpaq, catalyses the oxidation of Orange II, guaiacol, ABTS and Amplex Red with H2O2 in aqueous solutions at neutral pH. Under identical conditions, other structurally related nonheme iron complexes showed only negligible activities.
Hybrid nanoflowers (hNFs) consisting of horseradish peroxidase (HRP) enzyme and copper ions (Cu2+) with dramatically enhanced catalytic activity and stability.
The heme of hydrogen peroxide-dependent cytochrome P450BSβ (P450BSβ) was removed by apomyoglobin under mild conditions to give apo-P450BSβ without the need for acidicconditions and organic solvents. The circular dichroism spectrum of the apo-P450BSβ was essentially identical to that of holo-P450BSβ, showing a small structural change resulting from the removal of heme using apomyoglobin. The apo-P450BSβ
在温和的条件下通过肌红蛋白去除过氧化氢依赖性细胞色素P450BSβ(P450BSβ)的血红素,无需酸性条件和有机溶剂即可得到apo- P450BSβ。apo- P450BSβ的圆二色性光谱基本上与holo- P450BSβ的圆二色性光谱相同,显示由于使用肌红蛋白去除血红素而导致的微小结构变化。用血红素或锰原卟啉IX(MnPPIX)重构apo- P450BSβ,所得的重构的P450BSβ使用过氧化氢作为氧化剂催化愈创木酚的单电子氧化。观察到P450具有更高的催化活性当间氯过氧苯甲酸( m CPBA)用作氧化剂时, BSβ用MnPPIX重构。
Cytochrome <i>c</i>–poly(acrylic acid) conjugates with improved peroxidase turnover number
作者:K. R. Benson、J. Gorecki、A. Nikiforov、W. Tsui、R. M. Kasi、C. V. Kumar
DOI:10.1039/c9ob00541b
日期:——
Cytochrome c–poly(acrylic acid) conjugates with 34-fold enhanced peroxidase activity due to acidification of enzyme microenvironment and suppression of wasteful intermediates.