Thermodynamic redox properties governing the half-reduction characteristics of histamine dehydrogenase from Nocardioides simplex

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Abstract

Histamine dehydrogenase from Nocardioides simplex is a homodimer and belongs to the family of iron-sulfur flavoproteins having one [4Fe-4S] cluster and one 6-S-cysteinyl FMN per monomer. In the reductive titration with histamine, two-electron reduction occurred per monomer at pH < 9, while single-electron reduction proceeded at pH > 9. The substrate-reduced histamine dehydrogenase yielded an electron paramagnetic resonance spectral signal assigned to the flavin semiquinone. The signal intensity increased with pH up to pH 9 and reached a maximum at pH > 9. These unique features are explained in terms of the redox potential of the cofactors, where the redox potential was evaluated over a pH range from 7 to 10 by using a spectroelectrochemical titration method for the flavin and cyclic voltammetry for the [4Fe-4S] cluster. The bell-type pH dependence of the enzymatic activity is also discussed in terms of the pH dependence of the centers' redox potential.

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Tsutsumi, M., Fujieda, N., Tsujimura, S., Shirai, O., & Kano, K. (2008). Thermodynamic redox properties governing the half-reduction characteristics of histamine dehydrogenase from Nocardioides simplex. Bioscience, Biotechnology and Biochemistry, 72(3), 786–796. https://doi.org/10.1271/bbb.70665

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