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- W2075150947 abstract "The solution structure of the oxidized, paramagnetic form of cytochrome b562 from Escherichia coli (106 amino acids) is here reported as obtained from 1653 meaningful NOEs (from a total of 2051 unique NOEs), 33 (3)JHNHalpha values, and 339 pseudocontact shifts. The structure displays the typical four-helix bundle motif, and a disordered loop between helices alpha2 and alpha3, as found in the solid state. The solution structure has a conformation intermediate between the two independent solid-state molecules, although different orientations are observed for a few residues. The magnetic susceptibility tensor is similar to that of cytochrome c, which has the same ligands, although the anisotropy is somewhat smaller. This difference in the electronic structure is consistent with the thermal accessibility in cytochrome b562 of states with S > 1/2. The structure is also compared with the solution structure of the apoprotein, and some information on the role of the cofactor on the protein folding and mobility is obtained. Helix alpha4 seems to be the most sensitive to the chemical environment in terms of structure and mobility. The pKa values affecting the hyperfine-shifted signals are also discussed. Quite intriguing is the comparison of the structure of cytochrome b562 with the available structures of cytochromes c' which display a similar folding motif and similar pKa values but very little sequence similarity." @default.
- W2075150947 created "2016-06-24" @default.
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- W2075150947 date "1999-06-12" @default.
- W2075150947 modified "2023-09-25" @default.
- W2075150947 title "The Solution Structure of Oxidized <i>Escherichia coli</i> Cytochrome <i>b</i><sub>562</sub><sup>,</sup>" @default.
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- W2075150947 doi "https://doi.org/10.1021/bi982785f" @default.
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