نتایج جستجو برای: quinone

تعداد نتایج: 5334  

1998
Wieslawa Jarmuszkiewicz Claudine M. Sluse-Goffart Lilla Hryniewiecka Jan Michejda Francis E. Sluse

Amoeba mitochondria possess a respiratory chain with two quinol-oxidizing pathways: the cytochrome pathway and the cyanide-resistant alternative oxidase pathway. The ADP/O method, based on the non-phosphorylating property of alternative oxidase, was used to determine contributions of both pathways in overall state 3 respiration in the presence of GMP (an activator of the alternative oxidase in ...

2013
Kazuhiko Satoh Yasuhiro Kashino Hiroyuki Koike

We have recently shown that binding affinities o f benzoquinones can be estimated by two methods in photosystem (PS) II particles (K. Satoh et al., Biochim. Biophys. Acta 1 1 0 2 ,4 5 -5 2 (1992)). Using these methods we calculated the binding affinity o f thymoquinone (2-methyl5-isopropyl-/?-benzoquinone) to the QB site and studied how the quinone accepts electrons in oxygen-evolving PS II par...

Journal: :The Journal of biological chemistry 2013
Ruslan Nedielkov Wojtek Steffen Julia Steuber Heiko M Möller

The sodium ion-translocating NADH:quinone oxidoreductase (Na(+)-NQR) from the pathogen Vibrio cholerae exploits the free energy liberated during oxidation of NADH with ubiquinone to pump sodium ions across the cytoplasmic membrane. The Na(+)-NQR consists of four membrane-bound subunits NqrBCDE and the peripheral NqrF and NqrA subunits. NqrA binds ubiquinone-8 as well as quinones with shorter pr...

Journal: :Drug metabolism and disposition: the biological fate of chemicals 1999
S Kitamura K Sugihara K Tatsumi

The results of this study show the quinone-dependent reduction of tertiary amine N-oxides to the corresponding tertiary amines by rat liver preparations. The reduction of imipramine N-oxide to imipramine mediated by liver mitochondria, microsomes, and cytosol proceeded in the presence of both NAD(P)H and menadione under anaerobic conditions. When menadione was replaced with 1, 4-naphthoquinone ...

Journal: :Biochimica et biophysica acta 1993
M D Esposti S De Vries M Crimi A Ghelli T Patarnello A Meyer

Cytochrome b is the central redox catalytic subunit of the quinol: cytochrome c or plastocyanin oxidoreductases. It is involved in the binding of the quinone substrate and it is responsible for the transmembrane electron transfer by which redox energy is converted into a protonmotive force. Cytochrome b also contains the sites to which various inhibitors and quinone antagonists bind and, conseq...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2001
M Guergova-Kuras B Boudreaux A Joliot P Joliot K Redding

All photosynthetic reaction centers share a common structural theme. Two related, integral membrane polypeptides sequester electron transfer cofactors into two quasi-symmetrical branches, each of which incorporates a quinone. In type II reaction centers [photosystem (PS) II and proteobacterial reaction centers], electron transfer proceeds down only one of the branches, and the mobile quinone on...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1980
A M Benson M J Hunkeler P Talalay

2(3)-tert-Butyl-4-hydroxyanisole (BHA) is one of several widely used antioxidant food additives that protect against chemical carcinogenesis and toxicity. The present report concerns the enhancement of dicoumarol-inhibited NAD(P)H:quinone reductase [NAD(P)H dehydrogenase (quinone); NAD(P)H:(quinone acceptor) oxidoreductase, EC 1.6.99.2] activity in mouse tissues in response to dietary administr...

Journal: :Free radical research 2005
Julien Verrax Marianne Delvaux Nelson Beghein Henryk Taper Bernard Gallez Pedro Buc Calderon

Since the higher redox potential of quinone molecules has been correlated with enhanced cellular deleterious effects, we studied the ability of the association of ascorbate with several quinones derivatives (having different redox potentials) to cause cell death in K562 human leukaemia cell line. The rationale is that the reduction of quinone by ascorbate should be dependent of the quinone half...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Yang Song Brett A Wagner Jordan R Witmer Hans-Joachim Lehmler Garry R Buettner

The reactions of glutathione (GSH) with polychlorinated biphenyl (PCB) quinones having different degrees of chlorination on the quinone ring were examined. EPR spectroscopy and MS revealed 2 types of reactions yielding different products: (i) a nonenzymatic, nucleophilic displacement of chlorine on the quinone ring yielding a glutathiylated conjugated quinone and (ii) Michael addition of GSH to...

Journal: :Chemical & pharmaceutical bulletin 2004
Shunji Aoki Dexin Kong Kouhei Matsui Rachmaniar Rachmat Motomasa Kobayashi

A new sesquiterpene aminoquinone, 5-epi-smenospongorine, together with nine known sesquiterpene quinone/phenols, was isolated as differentiation-inducing substances to K562 cells into erythroblast from the marine sponge Dactylospongia elegans. The structure-activity relationship study of these compounds clarified that the quinone skeleton is indispensable and the amino group plays an important ...

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