Article
Biology
Chris Furlan, Nipa Chongdar, Pooja Gupta, Wolfgang Lubitz, Hideaki Ogata, James N. Blaza, James A. Birrell
Summary: Electron bifurcation is a fundamental energy conservation mechanism in nature that allows endergonic reactions to be driven by exergonic ones. In this study, the structure of HydABC, an electron-bifurcating [FeFe] hydrogenase, was determined using electron cryo-microscopy. The structure revealed a heterododecamer with a central electron transfer pathway, providing insights into the mechanism of electron bifurcation in HydABC. Based on these findings, a possible mechanism of electron bifurcation in HydABC was proposed.
Article
Biochemistry & Molecular Biology
Natalie Payne, Arlette Kpebe, Chloe Guendon, Carole Baffert, Julien Ros, Regine Lebrun, Yann Denis, Laetitia Shintu, Myriam Brugna
Summary: Through studying Desulfovibrio fructosovorans, we discovered that Hnd is involved in ethanol metabolism and oxidizes H-2 via its electron bifurcation mechanism, producing NADH and reduced ferredoxin.
MOLECULAR MICROBIOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Aurore Jacq-Bailly, Martino Benvenuti, Natalie Payne, Arlette Kpebe, Christina Felbek, Vincent Fourmond, Christophe Leger, Myriam Brugna, Carole Baffert
Summary: Hnd, a tetrameric enzyme from Desulfovibrio fructosovorans, is capable of flavin-based electron bifurcation. Despite its complexity, the enzyme can catalytically exchange electrons with an electrode and demonstrates unique high potential inactivation/reactivation kinetics. The catalytic properties of Hnd are comparable to standard hydrogenases, suggesting that the additional subunits necessary for electron bifurcation do not alter the enzyme's catalytic behavior at the active site.
FRONTIERS IN CHEMISTRY
(2021)
Article
Microbiology
Natalie Payne, Arlette Kpebe, Chloe Guendon, Carole Baffert, Matthieu Maillot, Typhaine Haurogne, Fabrice Tranchida, Myriam Brugna, Laetitia Shintu
Summary: Solidesulfovibrio fructosivorans possesses six gene clusters encoding hydrogenases that catalyze the reversible oxidation of hydrogen gas. One of these, Hnd, is an electron-bifurcating hydrogenase that plays a role in ethanol production under pyruvate fermentation. Through metabolomics analysis, it is found that Hnd is not only involved in ethanol metabolism but also indirectly affects global carbon metabolism and biosynthesis of branched-chain amino acids. The deletion of hndD leads to metabolic reprogramming and upregulation of NADP-dependent pathways.
MICROBIOLOGICAL RESEARCH
(2023)
Article
Microbiology
Arlette Kpebe, Chloe Guendon, Natalie Payne, Julien Ros, Manel Khelil Berbar, Regine Lebrun, Carole Baffert, Laetitia Shintu, Myriam Brugna
Summary: This study confirms the role of Hnd hydrogenase in ethanol metabolism and uncovers an essential function for a Desulfovibrio hydrogenase for the first time. Hnd is required for S. fructosivorans growth on ethanol, and it produces H-2 from NADH and reduced ferredoxin for ethanol conversion.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Multidisciplinary Sciences
Anuj Kumar, Florian Kremp, Jennifer Roth, Sven A. Freibert, Volker Mueller, Jan M. Schuller
Summary: This study reports the cryo-EM structure of the Stn class transhydrogenase from Sporomusa ovata and dissects its electron transfer pathway.
NATURE COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Franziska Hoeser, Maximilian Weiss, Thorsten Friedrich
Summary: NADH:ubiquinone oxidoreductase (respiratory complex I) is crucial for cellular energy metabolism, and deficiencies in complex I are often associated with mitochondrial dysfunction. In this study, researchers used Escherichia coli as a model system to investigate the effects of a 7 bps inversion in mtND1, which resulted in a triple mutation. The triple mutant showed poor growth and lacked enzymatic activity.
Article
Chemistry, Inorganic & Nuclear
Konstantin Laun, Iuliia Baranova, Jifu Duan, Leonie Kertess, Florian Wittkamp, Ulf-Peter Apfel, Thomas Happe, Moritz Senger, Sven T. Stripp
Summary: [FeFe]-hydrogenases are excellent H-2 evolution catalysts with active site cofactor comprising a [4Fe-4S] cluster linked to a diiron site with carbon monoxide and cyanide ligands. Proton transfer pathways and pH differences affect the stabilization of electrons at different cofactor states, influencing the hydrogen turnover process.
DALTON TRANSACTIONS
(2021)
Article
Microbiology
Xiaojia He, Grayson L. Chadwick, Christopher P. Kempes, Victoria J. Orphan, Christof Meile
Summary: The study reveals that in the process of anaerobic methane oxidation, archaea and sulfate-reducing bacteria limit the transfer of electrons between them, affecting the metabolic activity at a certain distance. Model simulations show that ohmic resistance and activation loss contribute to the decline in metabolic activity, and a hybrid metabolism combining DIET with a small contribution of diffusive exchange of electron donors can provide energetic advantages for syntrophic consortia.
Article
Biotechnology & Applied Microbiology
Tomoya Maeda, Abigail Koch-Koerfges, Michael Bott
Summary: The oxidation of NADH and reduction of quinone is crucial for cellular metabolism. In this study with Corynebacterium glutamicum, Ndh was found to be the main enzyme for NADH oxidation, while Mdh and LdhA can functionally replace Ndh. The study also showed that Mdh and LdhA, along with Mqo and LldD, play active roles in NADH oxidation and menaquinone reduction.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Biology
Piotr Kolata, Rouslan G. Efremov
Summary: The study reveals the structure of Escherichia coli respiratory complex I, showing dynamic connections within the peripheral and membrane domains. Unique structural features stabilize the peripheral domain assembly while the membrane domain structure exhibits novel dynamics, suggesting an uncoupled conformation of the complex. Based on the structural data, a new simplified hypothetical coupling mechanism is proposed for the molecular machine.
Article
Biochemistry & Molecular Biology
Karina Tuz, Ming Yuan, Yuyao Hu, Tien T. T. Do, Soohaeng Yoo Willow, Joseph A. DePaolo-Boisvert, James R. Fuller, David D. L. Minh, Oscar Juarez
Summary: The ion-pumping NQR complex is an essential respiratory enzyme in pathogenic bacteria, and it is the only enzyme reported to use riboflavin as a cofactor. This study identified the riboflavin-binding site in subunit B and found that conserved residues participate in stabilizing the cofactor through hydrogen bonds.
JOURNAL OF BIOLOGICAL CHEMISTRY
(2022)
Article
Microbiology
Pier Francesco Di Leonardo, Giacomo Antonicelli, Valeria Agostino, Angela Re
Summary: Understanding the organizational and functional properties of hydrogen metabolism is crucial for creating a framework to support a hydrogen-fueled low-carbon economy. This study investigated the genomes of several industrially relevant acetogens and identified their hydrogenases' repertoire. The findings provide valuable knowledge on the functional specificity and potential applications of hydrogenases in biotechnological processes.
MICROBIOLOGY SPECTRUM
(2022)
Article
Chemistry, Inorganic & Nuclear
Holly J. Redman, Ping Huang, Michael Haumann, Mun Hon Cheah, Gustav Berggren
Summary: In this study, a molecular mimic of the [FeFe]-hydrogenase was used to explore sustainable sources of hydrogen. Characterization of the produced species was carried out using various spectroscopy techniques. The results revealed the potential of the compound to generate biologically relevant iron-oxidation states and facilitate H-2 gas formation.
DALTON TRANSACTIONS
(2022)
Article
Pharmacology & Pharmacy
Peter Tsvetkov, Julia Adler, Romano Strobelt, Yaarit Adamovich, Gad Asher, Nina Reuven, Yosef Shaul
Summary: This passage demonstrates the interaction between SIRT1 and NQO1, indicating that SIRT1 can regulate the expression of NQO1 and exert a protective role under mitochondrial stress.
FRONTIERS IN PHARMACOLOGY
(2021)
Article
Biology
M. R. Lindsay, C. Anderson, N. Fox, G. Scofield, J. Allen, E. Anderson, L. Bueter, S. Poudel, K. Sutherland, J. H. Munson-McGee, J. D. Van Nostrand, J. Zhou, J. R. Spear, B. K. Baxter, D. R. Lageson, E. S. Boyd
Article
Ecology
Daniel R. Colman, Saroj Poudel, Trinity L. Hamilton, Jeff R. Havig, Matthew J. Selensky, Everett L. Shock, Eric S. Boyd
Article
Microbiology
Amaya M. Garcia Costas, Saroj Poudel, Anne-Frances Miller, Gerrit J. Schut, Rhesa N. Ledbetter, Kathryn R. Fixen, Lance C. Seefeldt, Michael W. W. Adams, Caroline S. Harwood, Eric S. Boyd, John W. Peters
JOURNAL OF BACTERIOLOGY
(2017)
Article
Biochemistry & Molecular Biology
Luke Berry, Saroj Poudel, Monika Tokmina-Lukaszewska, Daniel R. Colman, Diep M. N. Nguyen, Gerrit J. Schut, Michael W. W. Adams, John W. Peters, Eric S. Boyd, Brian Bothner
BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS
(2018)
Article
Microbiology
Maximiliano J. Amenabar, Daniel R. Colman, Saroj Poudel, Eric E. Roden, Eric S. Boyd
ENVIRONMENTAL MICROBIOLOGY
(2018)
Article
Microbiology
Kathryn R. Fixen, Nilanjan Pal Chowdhury, Marta Martinez-Perez, Saroj Poudel, Eric S. Boyd, Caroline S. Harwood
ENVIRONMENTAL MICROBIOLOGY
(2018)
Article
Microbiology
Saroj Poudel, Daniel R. Colman, Kathryn R. Fixen, Rhesa N. Ledbetter, Yanning Zheng, Natasha Pence, Lance C. Seefeldt, John W. Peters, Caroline S. Harwood, Eric S. Boyd
JOURNAL OF BACTERIOLOGY
(2018)
Article
Microbiology
Yanning Zheng, Derek F. Harris, Zheng Yu, Yanfen Fu, Saroj Poudel, Rhesa N. Ledbetter, Kathryn R. Fixen, Zhi-Yong Yang, Eric S. Boyd, Mary E. Lidstrom, Lance C. Seefeldt, Caroline S. Harwood
NATURE MICROBIOLOGY
(2018)
Article
Microbiology
Saroj Poudel, Eric C. Dunham, Melody R. Lindsay, Maximiliano J. Amenabar, Elizabeth M. Fones, Daniel R. Colman, Eric S. Boyd
FRONTIERS IN MICROBIOLOGY
(2018)
Article
Ecology
Elizabeth M. Fones, Daniel R. Colman, Emily A. Kraus, Daniel B. Nothaft, Saroj Poudel, Kaitlin R. Rempfert, John R. Spear, Alexis S. Templeton, Eric S. Boyd
Article
Multidisciplinary Sciences
Andrew C. Mutter, Alexei M. Tyryshkin, Ian J. Campbell, Saroj Poudel, George N. Bennett, Jonathan J. Silberg, Vikas Nanda, Paul G. Falkowski
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2019)
Article
Multidisciplinary Sciences
Eric S. Boyd, Maximiliano J. Amenabar, Saroj Poudel, Alexis S. Templeton
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2020)
Article
Multidisciplinary Sciences
Hagai Raanan, Saroj Poudel, Douglas H. Pike, Vikas Nanda, Paul G. Falkowski
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Biochemistry & Molecular Biology
Joshua A. Mancini, Douglas H. Pike, Alexei M. Tyryshkin, Liti Haramaty, Michael S. Wang, Saroj Poudel, Michael Hecht, Vikas Nanda
BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
(2020)