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• W2065529346 abstract "To clarify the structural role of Phe46 inside the hydrophobic core of bovine pancreatic ribonuclease A (RNase A), thermal and pressure unfolding of wild-type RNase A and three mutant forms (F46V, F46E, and F46K) were analyzed by fourth-derivative UV absorbance spectroscopy. All the mutants, as well as the wild type, exhibited a two-state transition during both thermal and pressure unfolding, and both T(m) and P(m) decreased markedly when Phe46 was replaced with valine, glutamic acid, or lysine. The strongest effect was on the F46K mutant and the weakest on F46V. Both unfolding processes produced identical blue shifts in the fourth-derivative spectra, indicating that the tyrosine residues are similarly exposed in the temperature- and pressure-induced unfolded states. A comparison of Gibbs free energies determined from the pressure and temperature unfoldings, however, gave DeltaG(p)/DeltaG(t) ratios (r) of 1.7 for the wild type and 0.92 +/- 0.03 for the mutants. Furthermore, the DeltaV value for each mutant was larger than that for the wild type. CD spectra and activity measurements showed no obvious major structural differences in the folded state, indicating that the structures of the Phe46 mutants and wild type differ in the unfolded state. We propose a model in which Phe46 stabilizes the hydrophobic core at the boundary between two structural domains. Mutation of Phe46 decreases protein stability by weakening the unfolding cooperativity between these domains. This essential function of Phe46 in RNase A stability indicates that it belongs to a chain-folding initiation site." @default.
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• W2065529346 date "2002-03-15" @default.
• W2065529346 modified "2023-09-29" @default.
• W2065529346 title "Comparison of Heat- and Pressure-Induced Unfolding of Ribonuclease A: The Critical Role of Phe46 Which Appears To Belong to a New Hydrophobic Chain-Folding Initiation Site" @default.
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• W2065529346 doi "https://doi.org/10.1021/bi011365e" @default.
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