quinone/dental caries

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Specific Methylation of Asp160 (49 kDa subunit) Located inside the Quinone Binding Cavity of Bovine Mitochondrial Complex I.

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Asp160 in the 49 kDa subunit of bovine mitochondrial complex I, which is located in the inner part of the quinone binding cavity, is considered to be an essential residue for energy conversion of the enzyme. To elucidate the catalytic function of this residue, we attempted to specifically methylate

Spare quinones in the QB cavity of crystallized photosystem II from Thermosynechococcus elongatus.

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The recent crystallographic structure at 3.0 A resolution of PSII from Thermosynechococcus elongatus has revealed a cavity in the protein which connects the membrane phase to the binding pocket of the secondary plastoquinone Q(B). The cavity may serve as a quinone diffusion pathway. By fluorescence

[Quinones as protective substances against dental caries].

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[Quinones as protective substances against dental caries].

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Experimental dental caries; further studies on effect of certain quinones.

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Observations on experimental dental caries; the effect of certain quinones with, and without vitamin K activity.

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Molecular control of a bimodal distribution of quinone-analogue inhibitor binding sites in the cytochrome b(6)f complex.

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The 3.0-3.1A X-ray structures of the cytochrome b(6)f complex from Mastigocladus laminosus and Chlamydomonas reinhardtii obtained in the presence of the p-side quinone-analogue inhibitor tridecyl-stigmatellin (TDS) are very similar. A difference occurs in the p-side binding position of TDS. In

Reduction of 1,4-quinone and ubiquinones by hydrogen atom transfer under UVA irradiation.

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1,4-Benzoquinone, coenzyme Q0 and Q10 were reacted with a series of hydrogen donors in the ESR cavity in the presence or absence of UVA irradiation. The signals of the radicals generated from the hydrogen donors or of those of the semiquinones were detected. The reaction mechanism was interpreted by

Hydrogen Sulfide Specifically Alters NAD(P)H Quinone Dehydrogenase 1 (NQO1) Olfactory Neurons in the Rat.

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The regions of the olfactory epithelium affected by hydrogen sulfide (H2S) toxicity in the rat present a striking similarity with the developmental olfactory zone 1 described in the mouse. This zone which is the only region containing neurons expressing NAD(P)H quinone dehydrogenase 1 (NQO1) is

Overview of synthesis and structure of calix[n]quinone (n = 4, 6, 8)

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Calix[n]quinones, a class of cyclic oligomers composed of p-benzoquinone structures connected by methylene, have multi-conjugated carbonyl structures and adjustable cavities, which make their synthesis extremely attractive. In this minireview, thesynthetic methods of calix[n]quinones and the recent

Studies on porphyrin-quinhydrone complexes: molecular recognition of quinone and hydroquinone in solution.

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Free-base and zinc(II) porphyrins bearing either one, two, or four hydroquinone entities at the meso positions are shown to bind quinones in solutions via a quinhydrone pairing mechanism. Electrochemical studies reveal that the quinhydrone complexes are stabilized by charge-transfer interactions

Electrochemical reduction of quinones: interfacing experiment and theory for defining effective radii of redox moieties.

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Using cyclic voltammetry, we examined the dependence of the reduction potentials of six quinones on the concentration of the supporting electrolyte. An increase in the electrolyte concentration, resulting in an increase in the solution polarity, caused positive shifts of the reduction potentials. We

A new method of solvation analysis: applications to quinones.

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A new method of analysis of the factor contributing to solvation of small molecules is described. Approximations of the energetic contributions to the entry of a molecule into water have been derived from partition coefficient data of solutes and selected derivatives from a multiplicity of solvents.

A computational study of unique properties of pillar[n]quinones: self-assembly to tubular structures and potential applications as electron acceptors and anion recognizers.

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Density functional theory has been used to calculate the thermodynamic properties and molecular orbitals of pillar[n]quinones. Pillar[n]quinones are expected to be effective electron acceptors and the ability to accept more than one electron increases with the size of the interior cavity.

Structure of the cytochrome b6f complex: quinone analogue inhibitors as ligands of heme cn.

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A native structure of the cytochrome b(6)f complex with improved resolution was obtained from crystals of the complex grown in the presence of divalent cadmium. Two Cd(2+) binding sites with different occupancy were determined: (i) a higher affinity site, Cd1, which bridges His143 of cytochrome f

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