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A continuous-wave probed laser-induced temperature jump system was constructed and applied to monitor the changes in tryptophan fluorescence of the beta-lactoglobulin during its folding; the kinetic phases were traced from 300 ns to 10 ms after a temperature jump. Notably, an early phase with typical squeezed-exponential characteristics, [exp[-(kt)(beta)], beta>1.0], was observed around several tens of microseconds after the temperature jump, which is actually the earliest phase ever observed for beta-lactoglobulin. This process can be explained by conformational shift occurring within the unfolded ensemble (U-->U'), which is followed by the non-native intermediate (I) formation of this protein. 相似文献
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