Results 71 to 80 of about 251,937 (291)
Frontiers in Microbiology, 2020 Haloferax mediterranei (R4) belongs to the group of halophilic archaea, one of the predominant microbial populations in hypersaline environments. In these ecosystems, the low availability of oxygen pushes the microbial inhabitants toward anaerobic ...
Javier Torregrosa-Crespo +3 more
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Frontiers in Microbiology, 2022 Heavy metals are essential micronutrients at low concentrations, serving as cofactors for relevant microbial enzymes (i.e., respiratory nitrate and nitrite reductases NADH dehydrogenase-2, amine oxidase, etc.), but they become harmful cellular ...
Marina García Llorca +2 more
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Pulse radiolysis studies on superoxide reductase from Treponema pallidum [PDF]
FEBS Letters, Elsevier, 2001, 497, pp.171-3, 2015 Superoxide reductases (SORs) are small metalloenzymes, which catalyze reduction of O2*- to H2O2. The reaction of the enzyme from Treponema pallidum with superoxide was studied by pulse radiolysis methods. The first step is an extremely fast bi-molecular reaction of the ferrous center with O2, with a rate constant of 6 x 10 (8) M(-1) s(-1).
arxiv +1 more source
Chemistry &Biodiversity, EarlyView.This graphical abstract represents the extraction, characterization, and biological evaluation of bioactive compounds derived from specific plant sources. The top section illustrates Rhus coriaria (sumac) fruit, Punica granatum (pomegranate) peel and Terminalia catappa (Indian almond) leaves', which are known for their rich phytochemical composition ...
Mudassir Nazir +8 more
wiley +1 more source
Redox Biology, 2018 Nitric oxide radical (NO) is a signaling molecule involved in several physiological and pathological processes and a new nitrate-nitrite-NO pathway has emerged as a physiological alternative to the ''classic'' pathway of NO formation from L-arginine ...
Luisa B. Maia, José J.G. Moura
doaj
ChemBioChem, EarlyView.In the nascent processes of the beginnings and evolution of life, nucleobases and especially purines, ribonucleos(t)ides and primitive RNAs have been continuously modified. A RNA‐peptide world and key metabolic pathways probably have emerged from the corresponding chemical modifications resulting from adenine deamination, purine alkylation and ...
Jean‐Luc Décout +1 more
wiley +1 more source
IUCrJ, 2017 Microbial nitrite reductases are denitrifying enzymes that are a major component of the global nitrogen cycle. Multiple structures measured from one crystal (MSOX data) of copper nitrite reductase at 240 K, together with molecular-dynamics simulations ...
Kakali Sen +9 more
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Structure of superoxide reductase bound to ferrocyanide and active site expansion upon X-ray-induced photo-reduction [PDF]
Structure, 2004, 12, pp.1729-40, 2015 Some sulfate-reducing and microaerophilic bacteria rely on the enzyme superoxide reductase (SOR) to eliminate the toxic superoxide anion radical (O2*-). SOR catalyses the one-electron reduction of O2*- to hydrogen peroxide at a nonheme ferrous iron center. The structures of Desulfoarculus baarsii SOR (mutant E47A) alone and in complex with ferrocyanide
arxiv +1 more source
Demonstration of Proton-coupled Electron Transfer in the Copper-containing Nitrite Reductases*
Journal of Biological Chemistry, 2009 The reduction of nitrite (NO2−) into nitric oxide (NO), catalyzed by nitrite reductase, is an important reaction in the denitrification pathway.
Sibylle Brenner +6 more
semanticscholar +1 more source
A three-domain copper-nitrite reductase with a unique sensing loop
IUCrJ, 2019 Dissimilatory nitrite reductases are key enzymes in the denitrification pathway, reducing nitrite and leading to the production of gaseous products (NO, N2O and N2).
Diederik Johannes Opperman +4 more
doaj +1 more source