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In the EPR spectrum, both T1 and T2 copper signals were observed, with a total of 1.6 copper atoms per subunit. The Hamiltonian parameters were A // = 64 G, g // = 2.25, and g ⊥ = 2.05 for the T1 copper and A // = 184 G, g // = 2.25, and g ⊥ = 2.05 for the T2 copper (Supplementary Fig. 2). All of these physical features of mgLAC do not ...
Copper decreased 0.13 USd/LB or 3.40% since the beginning of 2024, according to trading on a contract for difference (CFD) that tracks the benchmark market for this commodity. Historically, Copper reached an all time high of 5.02 in March of 2022. Copper - data, forecasts, historical chart - was last updated on January 15 of 2024.
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12794077. 10.1074/jbc.M302963200. CueO, a multicopper oxidase, is part of the copper-regulatory cue operon in Escherichia coli, is expressed under conditions of copper stress and shows enhanced oxidase activity when additional copper is present. The 1.7-A resolution structure of a crystal soaked in CuCl2 reveals a Cu (II) ion bound to the ...
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However, no direct relation was found between redox potentials and change in axial residues at T1 center [10]. Mutagenesis of Ile494 and Leu386 to alanine was done in order to modify the hydrophobic environment of T1 copper site. T1 site bridged to T3 via T1copper-Cys-His-T3 copper backbone is possibly the pathway responsible for electron ...
type proteins that harbor T1 copper sites taken from literature.40,41,44–47 Spectra of the 2R2R–Tt–Cu A and 4A3A–Tt–Cu A variants, as well as spectral deconvolutions, are shown in Fig. S1.† Fig. 3 Correlation of the 3 450/3 600 ratio with the Cu–S Cys effective stretching frequency for different types of mono-copper sites. Green
A UV-vis scan was recorded on the sample before it was flash-frozen in a quartz EPR tube. The remainder of the N 2 OR sample was incubated overnight, ... (±0.1) after copper addition. A greater …
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The T1 sites in native R. vernicifera laccase and its T2D derivative show the same Eo', as a result of compensatory differences in the reduction thermodynamics. This suggests that removal of the type-2 (T2) copper results in modification of the reduction-induced solvent reorganization effects, with no influence in the structure of the ...
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Laccases are multicopper enzymes that catalyze oxidation of electron-rich substrates coupled to reduction of molecular oxygen to water. Since the Type 1 copper (T1 Cu) is the site where electrons are withdrawn from the substrate, it is assumed that the reduction potential of this copper correlates with enzyme activity.Herein, we studied the …
INTRODUCTION. Multicopper oxidases (MCOs) form a family of enzymes that catalyze the oxidation of various organic substrates and metal ions coupled to the four-electron reduction of dioxygen (O 2) to water. 1,2 The active sites of MCOs include at least four copper ions, arranged in a mononuclear type 1 (T1) Cu, and a trinuclear Cu cluster …
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Site-directed mutagenesis has been used to replace Met502 in CotA laccase by the residues leucine and phenylalanine. X-ray structural comparison of M502L and M502F mutants with the wild-type CotA shows that the geometry of the T1 copper site is maintained as well as the overall fold of the proteins. The replacement of the weak so …
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Substitution of the Methionine Axial Ligand of the T1 Copper for the Fungal-like Phenylalanine Ligand (M298F) Causes Local Structural Perturbations that Lead to Thermal Instability and Reduced Catalytic Efficiency of the Small Laccase from Streptomyces coelicolor A3(2).
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