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- W2096763896 abstract "Abstract In the denatured state (D 1 state) of cystein‐free pyrrolidone carboxyl peptidase (PCP‐0SH) from Pyrococcus furiosus , a hyperthermophile under nondenaturing conditions, a fairly stable α‐helix (α6‐helix) has been determined from H/D exchange‐NMR experiments. On the other hand, the α6‐helix region of the proline‐mutant at position 199 (A199P) was unstructured in the D 1 state unlike that of the wild‐type PCP‐0SH, although the folded conformations of both proteins were almost identical to each other. This finding has been deduced from the information regarding the remaining amide hydrogens in the HSQC spectra after H/D exchanges in the D 1 state. To confirm this inference, we examined the helical propensities of two synthetic peptides from their NMR structural analysis in the presence of trifluoroethanol (TFE). One is an 18‐residue peptide called the wild‐type H6‐peptide corresponding to the α6‐helix (from Ser188 to Glu205) of the wild‐type PCP‐0SH, and the other is the mutant H6‐peptide corresponding to the α6‐helix region of A199P. The NOE‐contact information obtained from the 2D‐ 1 H‐NOESY spectra measured for both peptides in the presence of 30% TFE clearly demonstrated that the wild‐type H6‐peptide had a high helical propensity, but the mutant H6‐peptide was almost totally unstructured. The TFE‐induced helical propensities for these peptide fragments confirmed the conclusions deduced from the H/D exchange data measured in the D 1 states of two proteins. Proteins 2008. © 2007 Wiley‐Liss, Inc." @default.
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- W2096763896 date "2007-11-02" @default.
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- W2096763896 title "The confirmation of the denatured structure of pyrrolidone carboxyl peptidase under nondenaturing conditions: Difference in helix propensity of two synthetic peptides with single amino acid substitution" @default.
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- W2096763896 doi "https://doi.org/10.1002/prot.21742" @default.
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