scholarly journals The oxygen reduction reaction catalyzed by Synechocystis sp. PCC 6803 flavodiiron proteins

2019 ◽  
Vol 3 (11) ◽  
pp. 3191-3200 ◽  
Author(s):  
Katherine A. Brown ◽  
Zhanjun Guo ◽  
Monika Tokmina-Lukaszewska ◽  
Liam W. Scott ◽  
Carolyn E. Lubner ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Heme Iron ◽  
Non Heme Iron ◽  
Mediated Electron Transfer ◽  
Synechocystis Sp ◽  
Pcc 6803

Photosynthetic flavodiiron proteins catalyze oxygen reduction at non-heme iron sites (brown spheres) using flavin (FMN) mediated electron transfer (black arrows).

scholarly journals Comparison of Direct and Mediated Electron Transfer for Bilirubin Oxidase from Myrothecium Verrucaria. Effects of Inhibitors and Temperature on the Oxygen Reduction Reaction

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1056 ◽  
Author(s):  
Riccarda Antiochia ◽  
Diego Oyarzun ◽  
Julio Sánchez ◽  
Federico Tasca
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Direct Electron Transfer ◽  
Reduction Reaction ◽  
Redox Mediator ◽  
Bilirubin Oxidase ◽  
Myrothecium Verrucaria ◽  
Physiological Conditions ◽  
Mediated Electron Transfer

One of the processes most studied in bioenergetic systems in recent years is the oxygen reduction reaction (ORR). An important challenge in bioelectrochemistry is to achieve this reaction under physiological conditions. In this study, we used bilirubin oxidase (BOD) from Myrothecium verrucaria, a subclass of multicopper oxidases (MCOs), to catalyse the ORR to water via four electrons in physiological conditions. The active site of BOD, the T2/T3 cluster, contains three Cu atoms classified as T2, T3α, and T3β depending on their spectroscopic characteristics. A fourth Cu atom; the T1 cluster acts as a relay of electrons to the T2/T3 cluster. Graphite electrodes were modified with BOD and the direct electron transfer (DET) to the enzyme, and the mediated electron transfer (MET) using an osmium polymer (OsP) as a redox mediator, were compared. As a result, an alternative resting (AR) form was observed in the catalytic cycle of BOD. In the absence and presence of the redox mediator, the AR direct reduction occurs through the trinuclear site (TNC) via T1, specifically activated at low potentials in which T2 and T3α of the TNC are reduced and T3β is oxidized. A comparative study between the DET and MET was conducted at various pH and temperatures, considering the influence of inhibitors like H2O2, F−, and Cl−. In the presence of H2O2 and F−, these bind to the TNC in a non-competitive reversible inhibition of O2. Instead; Cl− acts as a competitive inhibitor for the electron donor substrate and binds to the T1 site.

scholarly journals Correction: the oxygen reduction reaction catalyzed by Synechocystis sp. PCC 6803 flavodiiron proteins

2020 ◽  
Vol 4 (1) ◽  
pp. 417-417
Author(s):  
Katherine A. Brown ◽  
Zhanjun Guo ◽  
Monika Tokmina-Lukaszewska ◽  
Liam W. Scott ◽  
Carolyn E. Lubner ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Sustainable Energy ◽  
Reduction Reaction ◽  
Synechocystis Sp ◽  
Pcc 6803

Correction for ‘The oxygen reduction reaction catalyzed by Synechocystis sp. PCC 6803 flavodiiron proteins’ by Katherine A. Brown et al., Sustainable Energy Fuels, 2019, DOI: 10.1039/c9se00523d.

Highly efficient and sustainable non-precious-metal Fe–N–C electrocatalysts for the oxygen reduction reaction

2018 ◽  
Vol 6 (6) ◽  
pp. 2527-2539 ◽  
Author(s):  
Meng Sun ◽  
Douglas Davenport ◽  
Huijuan Liu ◽  
Jiuhui Qu ◽  
Menachem Elimelech ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Precious Metal ◽  
Reduction Reaction ◽  
Electron Transfer Pathway ◽  
Highly Efficient

Efficient and sustainable Fe–N–C catalyst prepared by EDTA–Fe(ii) pyrolysis promotes the ORR performances within a nearly four-electron transfer pathway.

Efficient oxygen reduction reaction using mesoporous Ni-doped Co3O4 nanowire array electrocatalysts

2015 ◽  
Vol 3 (36) ◽  
pp. 18372-18379 ◽  
Author(s):  
Xili Tong ◽  
Xinhui Xia ◽  
Congxiu Guo ◽  
Yongqi Zhang ◽  
Jiangping Tu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Nanowire Array ◽  
Hydrothermal Process ◽  
Transfer Characteristic ◽  
Reduction Reaction ◽  
Electrochemical Activity ◽  
Nanowire Arrays ◽  
Simple Hydrothermal Process

Mesoporous Ni-doped Co3O4 nanowire arrays synthesized via a simple hydrothermal process exhibit high electrochemical activity and a four-electron transfer characteristic, with superior tolerance to methanol and CO, and better stability compared to a commercial Pt/C catalyst.

L2,3-edges absorption spectra of a 2D complex system: a theoretical modelling

2016 ◽  
Vol 18 (40) ◽  
pp. 28110-28116 ◽  
Author(s):  
S. Carlotto ◽  
M. Sambi ◽  
F. Sedona ◽  
A. Vittadini ◽  
J. Bartolomé ◽  
...  
Keyword(s):  
Complex System ◽  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Absorption Spectra ◽  
Ground State ◽  
Reduction Reaction ◽  
Theoretical Modelling ◽  
Electron Transfer Pathway ◽  
System A

Ground state theoretical outcomes pertaining to FePc (I) and FePc(η2-O2) (II) provide an intimate understanding of the electron transfer pathway ruling the catalytic oxygen reduction reaction of I on Ag(110).

Inner Sphere Electron Transfer Promotion on Homogeneously Dispersed Fe-Nx Centers for Energy-Efficient Oxygen Reduction Reaction

2020 ◽  
Vol 12 (32) ◽  
pp. 36026-36039 ◽  
Author(s):  
Ravi Nandan ◽  
Hemam Rachna Devi ◽  
Ritesh Kumar ◽  
Abhishek Kumar Singh ◽  
Chandan Srivastava ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Energy Efficient ◽  
Reduction Reaction ◽  
Inner Sphere
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