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• W2024883554 abstract "Pectate lyase C (pelC) is a member of the class of proteins that possess a parallel beta-helix folding motif. A study of the kinetic folding mechanism is presented in this report. Kinetic circular dichroism (CD) and fluorescence have been used to observe changes in the structure of pelC as a function of time upon folding and unfolding. Three folding phases are observed with far-UV CD and four phases are observed with near-UV CD. The two slowest phases have relaxation times on the order of 21 and 46 s in aqueous buffer. Double-jump refolding assays and the measured activation enthalpies (16.0 and 21.2 kcal/mol for the respective slow phases) suggest that these two phases are the result of the slow cis-trans isomerization of prolyl-peptide bonds. We have determined that the earliest observed folding phase involves the formation of most, if not all, of the secondary structure with a relaxation time of 0.25 s. We also observed a phase by near-UV CD on the order of 0.25 s. This suggests that along with the appearance of secondary structure, some tertiary contacts are made. There is one kinetic phase observed in the near-UV CD and fluorescence that has no corresponding far-UV CD phase. This occurs with a relaxation time of 1.1 s. The temperature dependence of the natural log of the folding rate constant suggests that folding occurs via a sequential mechanism in which an on-pathway intermediate in rapid equilibrium with the unfolded protein is present. Semiempirical CD calculations support the idea that the beta-helix region of pelC forms in the fast kinetic phase, yielding near-native secondary and tertiary structures in that region. This is followed by the slower formation of the loop regions connecting individual strands of the beta-helix." @default.
• W2024883554 created "2016-06-24" @default.
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• W2024883554 date "2002-03-15" @default.
• W2024883554 modified "2023-09-23" @default.
• W2024883554 title "Folding Kinetics of the Protein Pectate Lyase C Reveal Fast-Forming Intermediates and Slow Proline Isomerization^," @default.
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• W2024883554 doi "https://doi.org/10.1021/bi0115129" @default.
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