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• W2077810620 abstract "Metal-catalyzed oxidation (MCO) represents a prominent pathway of protein degradation. To evaluate the importance of the integrity of the metal-binding site on MCO, we subjected recombinant human growth hormone (rhGH), to MCO (ascorbate, Cu(2+), (3)O(2)) in the presence of various aliphatic alcohols (ethanol, ethylene glycol, trifluoroethanol, 1-propanol, 2-propanol, 1,2-propylene glycol, 1-butanol, 2-butanol, and tert-butanol). All alcohols inhibited MCO in a concentration-dependent and sigmoidal manner. Half-points, P(1/2), were dependent on the nature of the alcohol. Circular dichroism and fluorescence spectroscopy were used to monitor cosolvent-induced secondary and tertiary structural changes. The presence of alcohols increased the helical content of rhGH and induced a red shift in the tryptophan emission. The midpoints of the tertiary structural change correlated with the P(1/2) values. Solvent polarity at P(1/2) was determined according to the E(T)(30) scale. All alcohol/water mixtures at P(1/2) had rather similar solvent polarities between 54.5 to 56.4 kcal/mol, with the exception of ethylene glycol. On the other hand, no correlation was obtained between the protection against MCO and the hydroxyl radical-scavenging properties of the cosolvent. We conclude that the primary mechanism of MCO inhibition is a cosolvent-induced conformational perturbation of the metal-binding site as opposed to pure radical scavenging." @default.
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• W2077810620 date "2001-01-01" @default.
• W2077810620 modified "2023-10-03" @default.
• W2077810620 title "Metal‐catalyzed oxidation of human growth hormone: Modulation by solvent‐induced changes of protein conformation" @default.
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• W2077810620 doi "https://doi.org/10.1002/1520-6017(200101)90:1<58::aid-jps7>3.0.co;2-w" @default.
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