A Heme-Peptide Metalloenzyme Mimetic with Natural Peroxidase-Like Activity(435 views) Nastri F, Lista L, Ringhieri P, Vitale R, Faiella M, Andreozzi C, Travascio P, Maglio O, Lombardi A, Pavone V
Department of Chemistry, Complesso Universitario Monte S. Angelo, University of Naples Federico II, Via Cintia, 80126 Naples, Italy
IBB, CNR, Via Mezzocannone 16, 80134 Napoli, Italy
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A Heme-Peptide Metalloenzyme Mimetic with Natural Peroxidase-Like Activity
Mimicking enzymes with alternative molecules represents an important objective in synthetic biology, aimed to obtain new chemical entities for specific applications. This objective is hampered by the large size and complexity of enzymes. The manipulation of their structures often leads to a reduction of enzyme activity. Herein, we describe the spectroscopic and functional characterization of Fe(III)-mimochrome VI, a 3.5 kDa synthetic hemeprotein model, which displays a peroxidase-like catalytic activity. By the use of hydrogen peroxide, Fe(III)-mimochrome VI efficiently catalyzes the oxidation of several substrates, with a typical Michaelis-Menten mechanism and with several multiple turnovers. The catalytic efficiency of Fe(III)-mimochrome VI in the oxidation of 2,2'-azino-di(3-ethyl-benzothiazoline-6-sulfonic acid (ABTS) and guaiacol (k(cat)/K(m)=4417 and 870 mM(-1)s(-1), respectively) is comparable to that of native horseradish peroxidase (HRP, k(cat)/K(m)=5125 and 500 mM(-1)s(-1), respectively). Fe(III)-mimochrome VI also converts phenol to 4- and 2-nitrophenol in the presence of NO(2)(-) and H(2)O(2) in high yields. These results demonstrate that small synthetic peptides can impart high enzyme activities to metal cofactors, and anticipate the possibility of constructing new biocatalysts tailored to specific functions.
A Heme-Peptide Metalloenzyme Mimetic with Natural Peroxidase-Like Activity