Results 31 to 40 of about 8,969 (152)

Reactive oxygen species in spermatozoa: methods for monitoring and significance for the origins of genetic disease and infertility [PDF]

, 2005
Human spermatozoa generate low levels of reactive oxygen species in order to stimulate key events, such as tyrosine phosphorylation, associated with sperm capacitation. However, if the generation of these potentially pernicious oxygen metabolites becomes
Aitken R John, Baker Mark A
core   +2 more sources

The X‐Ray Crystal Structure of BorF, the Flavin Reductase Subunit of a Two‐Component Flavin‐Dependent Tryptophan Halogenase

Proteins: Structure, Function, and Bioinformatics, EarlyView.
ABSTRACT BorF is a short‐chain flavin reductase from a desert soil bacterium that uses NADH to reduce FAD to FADH2, which is used by the tryptophan‐6‐halogenase BorH to chlorinate tryptophan in the biosynthetic pathway of borregomycin A. The X‐ray crystal structure of BorF bound to FAD was solved to 2.37 Å by molecular replacement.
Zheng Ma, Emily W. Rady, Aravinda J. de Silva, John J. Bellizzi III   +3 more
wiley   +1 more source

A systematic investigation of Escherichia coli central carbon metabolism in response to superoxide stress [PDF]

, 2010
Background The cellular responses of bacteria to superoxide stress can be used to model adaptation to severe environmental changes. Superoxide stress promotes the excessive production of reactive oxygen species (ROS) that have detrimental ...
Bin Rui, Tie Shen, Hong Zhou, Jianping Liu, Jiusheng Chen, Xiaosong Pan, Haiyan Liu, Jihui Wu, Haoran Zheng, Yunyu Shi   +9 more
core   +1 more source

Integrated genomic and transcriptomic approaches reveal oxidative stress adaptation mechanisms in a mesotrione‐resistant Amaranthus tuberculatus biotype

Pest Management Science, EarlyView.
Integrated GWAS and transcriptomics in a Canadian waterhemp biotype reveal mesotrione resistance is polygenic and metabolically driven. Significant SNPs and 187 herbicide‐responsive genes point to enhanced redox homeostasis, glutathione‐linked detoxification, lipid/secondary metabolism, and oxidative stress responses. Resistance arises from coordinated,
Martin Laforest, Marianne Bessette, Geneviève Gagnon, Sandra Flores‐Mejia, Brahim Soufiane, Marie‐Claire Goulet, Dominique Michaud   +6 more
wiley   +1 more source

The evaluation of the activity of glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase under different patho-physiological conditions : a combined enzyme histochemical and biochemical approach [PDF]

, 1988
This thesis is based on a series of metabolic studies conducted on material obtained from human and experimental animal tissues and cells. The studies are essentially enzyme histochemical complemented when thought necessary with biochemical ...
Elias, E.A. (Ezzat), Heul, R.O. van der
core  

Targeting the substrate preference of a type I nitroreductase to develop antitrypanosomal quinone-based prodrugs. [PDF]

, 2012
Nitroheterocyclic prodrugs are used to treat infections caused by Trypanosoma cruzi and Trypanosoma brucei. A key component in selectivity involves a specific activation step mediated by a protein homologous with type I nitroreductases, enzymes found ...
Alsford, Alsford, Armstrong, Begleiter, Belinda S. Hall, Bern, Bienen, Bot, Brun, Bryant, Chaudhuri, Chen, Clarkson, Danson, Danson, Emma Louise Meredith, Ernster, Faeder, Fang, Fang, Fang, Fang, Garavaglia, Gascon, Goodwin, Guerra, Hall, Hall, Hall, Henderson, Hirumi, Hoet, Hu, Iyanagi, Jaiswal, Jarrom, Koder, Kubata, Müller, Nillius, Nivinskas, Nixon, O'Brien, Pal, Parkinson, Peterson, Pinto, Powis, Purkayastha, Race, Race, Ramos, Rassi, Shane R. Wilkinson, Stein, Stuart, Surve, Tatsumi, Tedeschi, Torri, Torri, Urech, Ward, Watanabe, Whiteway, Wilkinson, Yan, Zenno, Zenno   +68 more
core   +1 more source

Steroidogenic compensation and lipid deficiency with enhanced NAD+ salvage in small‐for‐gestational‐age placenta

The FEBS Journal, EarlyView.
Fetal growth restriction is associated with placental metabolic adaptations. In small‐for‐gestational‐age placenta (SGA), cholesterol receptors and steroidogenic enzymes are upregulated, enhancing steroidogenesis. NAD salvage pathway is also increased to support NADP+/NADPH requirements.
Serena Xodo, Lorenza Driul, Vanessa Tolotto, Eros Di Giorgio, Luigi E. Xodo   +4 more
wiley   +1 more source

Reduction of the plastoquinone pool by exogenous NADH and NADPH in higher plant chloroplasts. Characterization of a NAD(P)H-plastoquinone oxidoreductase activity

Biochimica et biophysica acta
Chlorophyll fluorescence measurements were performed on osmotically lysed potato chloroplasts in order to characterize the reactions involved in the dark reduction of photosynthetic inter-system chain electron carriers. Addition of NADH or NADPH to lysed chloroplasts increased the chlorophyll fluorescence level measured in the presence of a non-actinic
, Corneille, , Cournac, , Guedeney, , Havaux, , Peltier   +4 more
openaire   +3 more sources

Structures and proton-pumping strategies of mitochondrial respiratory enzymes [PDF]

, 2001
Enzymes of the mitochondrial respiratory chain serve as proton pumps, using the energy made available from electron transfer reactions to transport protons across the inner mitochondrial membrane and create an electrochemical gradient used for the ...
Chan, Sunney I., Schultz, Brian E.
core   +1 more source

Tyrosine residues at the substrate binding site in human NQO1 homodimer: Protein conformational dynamics and optimization of substrate binding geometry

The FEBS Journal, EarlyView.
Human NAD(P)H:quinone oxidoreductase 1 is a homodimeric flavoenzyme crucial for redox metabolism and linked to significant health issues. Point mutations at Tyr126 and Tyr128 demonstrate their essential roles in optimizing substrate binding geometry for catalysis, as well as in half‐site reactivity and conformational dynamics during the enzyme's ...
Maribel Rivero, Juan Luis Pacheco‐Garcia, Pavla Vankova, Dmitry Loginov, Isabel Quereda‐Moraleda, Jose Manuel Martin‐Garcia, Petr Man, Angel Luis Pey, Milagros Medina   +8 more
wiley   +1 more source