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- W2000132209 abstract "Heteronuclear NMR spectroscopy was used to measure the hydrogen−deuterium exchange rates of backbone amide hydrogens in both oxidized and reduced [U-15N]iso-1-cytochrome c from the yeast Saccharomyces cerevisiae. The exchange data confirm previously reported data [Marmorino et al. (1993) Protein Sci. 2, 1966−1974], resolve several inconsistencies, and provide more thorough coverage of exchange rates throughout the cytochrome c protein in both oxidation states. Combining the data previously collected on unlabeled C102T with the current data collected on [U-15N]C102T, exchange rates for 53 protons in the oxidized state and 52 protons in the reduced state can now be reported. Most significantly, hydrogen exchange measurements on [U-15N]iso-1-cytochrome c allowed the observation of exchange behavior of the secondary structures, such as large loops, that are not extensively hydrogen-bonded. For the helices, the most slowly exchanging protons are found in the middle of the helix, with more rapidly exchanging protons at the helix ends. The observation for the Ω-loops in cytochrome c is just the opposite. In the loops, the ends contain the most slowly exchanging protons and the loop middles allow more rapid exchange. This is found to be true in cytochrome c loops, even though the loop ends are not attached to any regular secondary structures. Some of the exchange data are strikingly inconsistent with data collected on the C102S variant at a different pH, which suggests pH-dependent dynamic differences in the protein structure. This new hydrogen exchange data for loop residues could have implications for the substructure model of eukaryotic cytochrome c folding. Isotopic labeling of variant forms of cytochrome c can now be used to answer many questions about the structure and folding of this model protein." @default.
- W2000132209 created "2016-06-24" @default.
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- W2000132209 date "1999-03-17" @default.
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- W2000132209 title "Hydrogen Exchange Behavior of [<i>U</i>-<sup>15</sup>N]-Labeled Oxidized and Reduced Iso-1-cytochrome <i>c</i>" @default.
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- W2000132209 doi "https://doi.org/10.1021/bi982742z" @default.
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