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cytochrome c/кариес зубов

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The role of aspartate-235 in the binding of cations to an artificial cavity at the radical site of cytochrome c peroxidase.

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The activated state of cytochrome c peroxidase, compound ES, contains a cation radical on the Trp-191 side chain. We recently reported that replacing this tryptophan with glycine creates a buried cavity at the active site that contains ordered solvent and that will specifically bind substituted

Small molecule binding to an artificially created cavity at the active site of cytochrome c peroxidase.

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In the oxidized "ES" state of cytochrome c peroxidase, Trp-191 is reversibly oxidized to a stable cation free radical by the hypervalent heme. To explore the potential for engineering a binding site for heterocyclic compounds at this site, the mutant W191G was constructed. Two independent crystal

Dynamics, hydration, and motional averaging of a loop-gated artificial protein cavity: the W191G mutant of cytochrome c peroxidase in water as revealed by molecular dynamics simulations.

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Five molecular dynamics simulations of the W191G cavity mutant of cytochrome c peroxidase in explicit water reveal distinct dynamic and hydration behavior depending on the closed or open state of the flexible loop gating the cavity, the binding of (K+ or small molecule) cations, and the system

Probing redox reactions of immobilized cytochrome c using evanescent wave cavity ring-down spectroscopy in a thin-layer electrochemical cell.

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We report the use of evanescent wave cavity ring-down spectroscopy (EW-CRDS) to monitor the reduction by ethylenediaminetetraacetic acid iron(II) complex, [FeEDTA](2-), of an adsorbed layer of oxidized cytochrome c immobilized on fused silica. The adsorption of cytochrome c at the silica-water

The active-site cysteinyls and hydrophobic cavity residues of ResA are important for cytochrome c maturation in Bacillus subtilis.

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ResA is an extracytoplasmic membrane-bound thiol-disulfide oxidoreductase required for cytochrome c maturation in Bacillus subtilis. Previous biochemical and structural studies have revealed that the active-site cysteinyls cycle between oxidized and reduced states with a low reduction potential and

Introduction of novel substrate oxidation into cytochrome c peroxidase by cavity complementation: oxidation of 2-aminothiazole and covalent modification of the enzyme.

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The binding and oxidation of an artificial substrate, 2-aminothiazole, by an engineered cavity of cytochrome c peroxidase is described. The W191G mutant has been shown to create a buried cavity into which a number of small heterocyclic compounds will bind [Fitzgerald, M. M., Churchill, M. J., McRee,

Heme cavity dynamics of photodissociated CO from ba3-cytochrome c oxidase: the role of ring-D propionate.

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Intracavity molecular dynamics studies of photodissociated carbon monoxide from ba(3)-cytochrome c oxidase have been performed by sampling the phase space with several hundreds of trajectories each integrated up to 100 ps time interval. It is shown that the cis conformation of protonated ring-D

Three-dimensional solution structure of the cyanide adduct of a Met80Ala variant of Saccharomyces cerevisiae iso-1-cytochrome c. Identification of ligand-residue interactions in the distal heme cavity.

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The 1H NMR spectrum of the the cyanide adduct of a triply mutated Saccharomyces cerevisiae iso-1-cytochrome c (His39Gln/Met80Ala/Cys102Ser) in the oxidized form has been assigned through 1D NOE and 2D COSY, TOCSY, NOESY, and NOE-NOESY experiments; 562 protons out of a total of 683 have been

Thermodynamic properties of internal water molecules in the hydrophobic cavity around the catalytic center of cytochrome c oxidase.

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Cytochrome c oxidase is a redox-driven proton pump that creates a membrane proton gradient responsible for driving ATP synthesis in aerobic cells. The crystal structure of the enzyme has been recently solved; however, the details of the mechanism of its proton pumping remain unknown. The enzyme

Cavity hydration dynamics in cytochrome c oxidase and functional implications.

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Cytochrome c oxidase (CcO) is a transmembrane protein that uses the free energy of O2 reduction to generate the proton concentration gradient across the membrane. The regulation of competitive proton transfer pathways has been established to be essential to the vectorial transport efficiency of CcO,

Changing hydration level in an internal cavity modulates the proton affinity of a key glutamate in cytochrome c oxidase.

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Cytochrome c oxidase contributes to the transmembrane proton gradient by removing two protons from the high-pH side of the membrane each time the binuclear center active site is reduced. One proton goes to the binuclear center, whereas the other is pumped to the low-pH periplasmic space. Glutamate

Conformational substates of horse heart cytochrome c exhibit different thermal unfolding of the heme cavity.

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The charge transfer (CT) band at 695 nm in the spectrum of ferri-cytochrome c is highly asymmetric, indicating conformational heterogeneity due to the coexistence of different conformational substates. We have measured the respective band profile of horse heart ferri-cytochrome c as a function of

How does reorganization energy change upon protein unfolding? Monitoring the structural perturbations in the heme cavity of cytochrome c.

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In several classes of proteins the redox center provides an additional intrinsic biophysical probe that could be used to study the protein structure and function. In present report reorganization energy (lambda, as a parameter describing electron transfer properties) was used to study the protein

Investigating the Many Roles of Internal Water in Cytochrome c Oxidase.

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Cytochrome c oxidase (C cO) is the terminal enzyme in the respiratory electron transport chain. As part of its catalytic cycle, C cO transfers protons to its Fe-Cu binuclear center (BNC) to reduce oxygen, and in addition, it pumps protons across the mitochondrial inner, or bacterial, membrane where

Water-gated mechanism of proton translocation by cytochrome c oxidase.

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Cytochrome c oxidase is essential for aerobic life as a membrane-bound energy transducer. O(2) reduction at the haem a(3)-Cu(B) centre consumes electrons transferred via haem a from cytochrome c outside the membrane. Protons are taken up from the inside, both to form water and to be pumped across
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