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peroxidase/carie dentaire
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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
Selenium and glutathione peroxidase levels in patients with epidermoid carcinoma of the oral cavity and oropharynx.
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Selenium ingestion may inhibit carcinogenesis. Epidemiologic studies have shown that age-adjusted death rates for cancer at most head and neck sites are lower in states where the soil and forage crops contain higher levels of selenium. The mode of action is incompletely understood, but may be
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
Effect of distal cavity mutations on the formation of compound I in catalase-peroxidases.
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Catalase-peroxidases have a predominant catalase activity but differ from monofunctional catalases in exhibiting a substantial peroxidase activity and in having different residues in the heme cavity. We present a kinetic study of the formation of the key intermediate compound I by probing the role
New insights into the heme cavity structure of catalase-peroxidase: a spectroscopic approach to the recombinant synechocystis enzyme and selected distal cavity mutants.
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Catalase-peroxidases (KatGs) are heme peroxidases with homology to yeast cytochrome cperoxidase (CCP) and plant ascorbate peroxidases (APXs). KatGs exhibit a peroxidase activity of broad specificity and a high catalase activity, which strongly depends on the presence of a distal Trp as part of the
Unusual oxidative chemistry of N(omega)-hydroxyarginine and N-hydroxyguanidine catalyzed at an engineered cavity in a heme peroxidase.
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Heme enzymes are capable of catalyzing a range of oxidative chemistry with high specificity, depending on the surrounding protein environment. We describe here a reaction catalyzed by a mutant of cytochrome c peroxidase, which is similar but distinct from those catalyzed by nitric-oxide synthase. In
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,
Inorganic chemistry of defensive peroxidases in the human oral cavity.
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The innate host response system is comprised of various mechanisms for orchestrating host response to microbial infection of the oral cavity. The heterogeneity of the oral cavity and the associated microenvironments that are produced give rise to different chemistries that affect the innate defense
Reaction of N-hydroxyguanidine with the ferrous-oxy state of a heme peroxidase cavity mutant: a model for the reactions of nitric oxide synthase.
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Yeast cytochrome c peroxidase was used to construct a model for the reactions catalyzed by the second cycle of nitric oxide synthase. The R48A/W191F mutant introduced a binding site for N-hydroxyguanidine near the distal heme face and removed the redox active Trp-191 radical site. Both the R48A and
Demonstration of secretory component, IgA, and IgM by the peroxidase-antiperoxidase technique in inverted papillomas of the nasal cavities.
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Fifteen inverted papillomas were examined by the peroxidase-antiperoxidase method for their ability to synthesize secretory component (SC) and to take up IgA and IgM. In each case, SC and IgA could be localized to the apical cytoplasm of some tumor cells. In addition, secretory component, IgA, and
Understanding heme cavity structure of peroxidases: comparison of electronic absorption and resonance Raman spectra with crystallographic results.
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Electronic absorption and resonance Raman spectra of various peroxidases and selected site-directed mutants are reported. These results and the X-ray crystal structure data are critically analyzed and underline the differences that exist between the crystal and solution states. The effect of the
Structural influence of calcium on the heme cavity of cationic peanut peroxidase as determined by 1H-NMR spectroscopy.
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The cationic isozyme of peanut peroxidase (CPRx) is one of many peroxidases which requires calcium for enzyme activity. It has been previously shown that it requires 2 mol calcium to coordinate to 1 mol CPRx, and its related peroxidases from the basidiomycete Phanerochaete chrysosporium (LiP) and
Engineering the proximal heme cavity of catalase-peroxidase.
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Catalase-peroxidases (KatGs) are prokaryotic heme peroxidases with homology to yeast cytochrome c peroxidase (CCP) and plant ascorbate peroxidases (APXs). KatGs, CCP and APXs contain identical amino acid triads in the heme pocket (distal Arg/Trp/His and proximal His/Trp/Asp), but differ dramatically
Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine.
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Atomic co-ordinates and structure factors for the T67R/S92D metMbCN mutant have been deposited with the Protein Data Bank, under accession codes 1h1x and r1h1xsf, respectively. Protein engineering and cofactor replacement have been employed as tools to introduce/modulate peroxidase activity in sperm
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