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- W2549677965 abstract "Previously, an electron spin echo envelope modulation (ESEEM) spectroscopic approach was established to probe the local secondary structure of membrane proteins and peptides utilizing site-directed spin-labeling (SDSL). In this method, the side chain of one amino acid residue is selectively 2H-labeled and a nitroxide spin label is strategically placed 1, 2, 3, or 4 amino acids away from the 2H-labeled amino acid (denoted as i ± 1 to i ± 4, i represents the 2H-labeled amino acid). ESEEM can detect the dipolar coupling between the nitroxide spin label and 2H atoms on the amino acid side chain. Due to the periodicity of different secondary structures, different ESEEM patterns can be revealed to probe the structure. For an α-helical structural component, a 2H ESEEM signal can be detected for i ± 3 and i ± 4 samples, but not for i ± 1 or i ± 2 samples. Several 2H-labeled hydrophobic amino acids have been demonstrated in model system that can be utilized to identify local secondary structures via this ESEEM approach in an extremely efficient fashion. In this study, the ESEEM approach was used to investigate the rod 2B region of the full-length intermediate filament protein human vimentin. Consistent with previous EPR and X-ray crystallography results, our ESEEM results indicated helical structural components within this region. Thus, this ESEEM approach is able to identify α-helical structural components despite the coiled-coil nature of the vimentin structure. The data show that the human vimentin rod 2B adapted a typical α-helical structure around residue Leu309. This result is consistent with the X-ray data from fragmented protein segments and continuous wave EPR data on the full-length vimentin. Finally, the ESEEM data suggested that a local secondary structure slightly different from a typical α-helix was adopted around residue 340." @default.
- W2549677965 created "2016-11-30" @default.
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- W2549677965 date "2016-11-28" @default.
- W2549677965 modified "2023-09-26" @default.
- W2549677965 title "Probing the Local Secondary Structure of Human Vimentin with Electron Spin Echo Envelope Modulation (ESEEM) Spectroscopy" @default.
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- W2549677965 doi "https://doi.org/10.1021/acs.jpcb.6b10054" @default.
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