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- W1966924167 abstract "Five peptides matching the helices alpha4, alpha5, alpha6, alpha7, and alpha8, spanning the entire sequence of domain II of pG-STP1-1, have been synthesized and their conformations analyzed by far-UV CD spectroscopy. The results show that a5, a7, and a8 peptides are unstructured in water/2,2,2-trifluoroethanol (TFE) solutions. The a4-peptide also adopts random conformations in aqueous solvent. Moreover, the relative low helical content (20%), estimated for this peptide in the presence of 30% (v/v) TFE, suggests that the sequence of this protein fragment does not possess sufficient information for a strong helical propensity. On the contrary, the synthesized a6 peptide, in the presence of TFE, showed a relevant structural autonomy with a helical content (41%) which was significantly higher than that estimated, under the same conditions, for all other peptides. More in general in the presence of solvents less polar than water, the isolated a6 peptide shows the same helical conformation adopted by the corresponding alpha6-helix in the hydrophobic core of the protein. A n-capping box motif, strictly conserved at the N-terminal of the alpha6-helix of all GST and related protein including eucaryotic translation elongation factor (EF1gamma) and the yeast prion protein Ure2, plays an important role in the alpha-helix nucleation and stability of this protein fragment. The results suggest that the alpha6-helix might represent a nucleation site of GST folding and that the helical conformation of this region of the protein is an important requirement during earlier events of GST refolding." @default.
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- W1966924167 date "2001-05-01" @default.
- W1966924167 modified "2023-09-26" @default.
- W1966924167 title "Conformational Properties of Five Peptides Corresponding to the Entire Sequence of Glutathione Transferase Domain II" @default.
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- W1966924167 doi "https://doi.org/10.1006/abbi.2001.2316" @default.
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