Photosystem I light-harvesting proteins regulate photosynthetic electron transfer and hydrogen production

DOI: 10.1093/plphys/kiac055 Authors: Thi Thu Hoai Ho, C. E. Schwier, Tamar Elman, Vera Fleuter, Karen Zinzius, Martin Scholz, Iftach Yacoby, Félix Buchert, Michael Hippler Abstract: Linear electron flow (LEF) and cyclic electron flow (CEF) compete for light-driven...

Negative cooperativity in the nitrogenase Fe protein electron delivery cycle

DOI: 10.1073/pnas.1613089113 Authors: Karamatullah Danyal, Sudipta Shaw, Taylor R. Page, Simon Duval, Masaki Horitani, Amy R. Marts, Dmitriy Lukoyanov, Dennis R. Dean, Simone Raugei, Brian M. Hoffman, Lance C. Seefeldt, Edwin Antony Abstract: Nitrogenase catalyzes the...

Energy transducing redox steps of the Na ⁺ -pumping NADH:quinone oxidoreductase from Vibrio cholerae

DOI: 10.1073/pnas.1002866107 Authors: Oscar Juárez, Joel E. Morgan, Mark J. Nilges, Blanca Barquera Abstract: Na(+)-NQR is a unique respiratory enzyme that couples the free energy of electron transfer reactions to electrogenic pumping of sodium across the cell...

Mechanistic studies on the dehydrogenases of methylotrophic bacteria. 2. Kinetic studies on the intramolecular electron transfer in trimethylamine and dimethylamine dehydrogenase

DOI: 10.1042/bj2070241 Authors: Daniël J. Steenkamp, Helmut Beinert Abstract: E.p.r. spectroscopy of the trimethylamine and dimethylamine dehydrogenases of Hyphomicrobium X indicates that the substrate-reduced forms of these enzymes exist in the triplet state, which...

The Reductive Half-reaction of Xanthine Oxidase

DOI: 10.1074/jbc.274.6.3323 Authors: Min Xia, Robert E. Dempski, Russ Hille Abstract: The kinetics of xanthine oxidase has been investigated with the aim of addressing several outstanding questions concerning the reaction mechanism of the enzyme. Steady-state and...

A general reaction mechanism for carbapenem hydrolysis by mononuclear and binuclear metallo-β-lactamases

DOI: 10.1038/s41467-017-00601-9 Authors: María‐Natalia Lisa, Antonela R. Palacios, Mahesh Aitha, Mariano M. González, Diego M. Moreno, Michael W. Crowder, Robert A. Bonomo, James Spencer, David L. Tierney, Leticia I. Llarrull, Alejandro J. Vila Abstract:...

Hydrogen Bond Network between Amino Acid Radical Intermediates on the Proton-Coupled Electron Transfer Pathway ofE. coliα2 Ribonucleotide Reductase

DOI: 10.1021/ja510513z Authors: Thomas U. Nick, Wankyu Lee, Simone Koßmann, Frank Neese, JoAnne Stubbe, Marina Bennati Abstract: Ribonucleotide reductases (RNRs) catalyze the conversion of ribonucleotides to deoxyribonucleotides in all organisms. In all Class Ia RNRs,...

Chemical Nature and Reaction Mechanisms of the Molybdenum Cofactor of Xanthine Oxidoreductase

DOI: 10.2174/1381612811319140010 Authors: Ken Okamoto, Teruo Kusano, Takeshi Nishino Abstract: Xanthine oxidoreductase (XOR), a complex flavoprotein, catalyzes the metabolic reactions leading from hypoxanthine to xanthine and from xanthine to urate, and both reactions...

Participation of the iron-sulphur cluster and of the covalently bound coenzyme of trimethylamine dehydrogenase in catalysis

DOI: 10.1042/bj1690361 Authors: Daniël J. Steenkamp, Thomas P. Singer Abstract: Bacterial trimethylamine dehydrogenase contains a novel type of covalently bound flavin mononucleotide and a tetrameric iron-sulphur centre. The dehydrogenase takes up 1.5mol of...

Probing Electron Transfer in Flavocytochrome P‐450 BM3 and Its Component Domains

DOI: 10.1111/j.1432-1033.1996.0403u.x Authors: Andrew W. Munro, Simon Daff, John R. Coggins, J. Gordon Lindsay, Stephen K. Chapman Abstract: Rapid events in the processes of electron transfer and substrate binding to cytochrome P-450 BM3 from Bacillus megaterium and...