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- W2009653722 abstract "Understanding protein stability requires characterization of structural determinants of the folded and unfolded states. Many proteins are capable of populating partially folded states under specific solution conditions. Occasionally, coexistence of the folded and an unfolded state under non- or mildly denaturing conditions can be observed by NMR, allowing us to structurally probe these states under identical conditions. Here we report on a destabilized mutant of the B1 domain of protein G (GB1) whose equilibrium unfolding was systematically investigated. Backbone amide residual dipolar couplings (RDCs), the tryptophan Nepsilon-H resonance and the amide nitrogen transverse relaxation rates (R2s) for varying pH values and different temperatures were measured. The backbone amide RDCs indicate that prior to complete unfolding, two melting hot spots are formed at the turn around T11, L12 and K13 and the N terminus of the helix at A24 and T25. The RDCs for the low pH, thermally unfolded state of GB1 are very small and do not indicate the presence of any native-like structure. Amide nitrogen transverse relaxation rates for GB1 in the folded state at different temperatures exhibit large contributions from exchange processes and the associated dynamics display considerable heterogeneity. Our data provide clear evidence for intermediate conformations and multi-state equilibrium un/folding for this GB1 variant." @default.
- W2009653722 created "2016-06-24" @default.
- W2009653722 creator A5004995359 @default.
- W2009653722 creator A5042363295 @default.
- W2009653722 creator A5074112300 @default.
- W2009653722 date "2004-01-01" @default.
- W2009653722 modified "2023-10-14" @default.
- W2009653722 title "Insights into Conformation and Dynamics of Protein GB1 During Folding and Unfolding by NMR" @default.
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- W2009653722 doi "https://doi.org/10.1016/j.jmb.2003.11.042" @default.
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