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• W2334075015 endingPage "13764" @default.
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• W2334075015 abstract "Using azurin as a model protein, this study enquires on the nature of small and large amplitude structural fluctuations permitting the penetration of different size solutes within protein folds, as inferred from quenching of the phosphorescence of buried Trp residues. The work examines the effect that guanidinium hydrochloride and urea have on the migration of a range of quencher molecules of increasing molecular size (Mw range = 32–206 Da). Using the quenching rate constant of Trp phosphorescence as a monitor, the results demonstrate that structural fluctuations linked to O2 migration are not affected by denaturants, whereas larger amplitude structural fluctuations necessary to facilitate penetration of bulkier quencher molecules [acrylonitrile, acrylamide, N-(hydroxymethyl) acrylamide, N-[tris(hydroxymethyl) methyl]acrylamide, and 2-acrylamido-2-methyl-1-propanesulfonic acid] are clearly enhanced by the presence of denaturant. These data when interpreted in the context of the amount of new protein surface uncovered to solvent (ΔSASAo) by the underlying structural fluctuations show a direct correlation between the amplitude of these motions and ΔSASAo. Denaturants also promote slow frequency (20–80 s–1) conformational transitions, not manifested in normal aqueous solutions, which provide extra migration pathways for acrylamide and its larger derivatives. The quencher-size dependence of the quenching rate provides evidence of multiple, independent quencher migration pathways to the azurin core, which are characterized by motions on different time scales, microseconds and milliseconds, and by a 3- to 5-fold difference in ΔSASAo, respectively." @default.
• W2334075015 created "2016-06-24" @default.
• W2334075015 creator A5021663386 @default.
• W2334075015 creator A5077820602 @default.
• W2334075015 date "2011-10-28" @default.
• W2334075015 modified "2023-09-26" @default.
• W2334075015 title "Influence of Denaturants on Native-State Structural Fluctuations in Azurin Probed by Molecular Size-Dependent Quenching of Trp Phosphorescence" @default.
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• W2334075015 doi "https://doi.org/10.1021/jp208397m" @default.
• W2334075015 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21992656" @default.
• W2334075015 hasPublicationYear "2011" @default.
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