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- W2117231490 abstract "In the crystal structure of human T-state hemoglobin with a sebacyl residue cross-linking the two beta-subunit Lys82,s (DecHb), the Fe atoms of the alpha-subunit hemes are found to be oxidized with a water molecule bound. The three-dimensional structure and heme geometries were compared to those of deoxyhemoglobin and other partially and fully oxidized hemoglobins [R. Liddington, Z. Derewenda, E. Dodson, R. Hubbard, G. Dodson, J. Mol. Biol. 228 (1992) 551]. The heme geometries of the alpha-subunits are consistent with those observed in oxidized structures. The proximal histidines of the alpha-subunits move toward the heme plane shifting the F-helix and FG-corner in a manner observed for partially oxidized human hemoglobin. This supports the hypothesis that these perturbations may precede the T- to R-state transition. Circular dichroism studies comparing DecHb and natural human hemoglobin in the deoxy and CO ligated forms confirm that the conformations of the deoxy forms are identical, but the ligated forms have slight differences in the solution structures. DecHb is found to be more resistant to autoxidation than natural hemoglobin. The time course of autoxidation of DecHb shows that it is virtually absent for the first 1500 min followed by a rapid increase. Thus, the discovery of the oxidation of the alpha-subunits in the deoxy-crystals is quite unexpected. The data confirm that ligation of the alpha-subunits precedes that of the beta-subunits. This may suggest a low ligand affinity of the alpha-diligated form of hemoglobin." @default.
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- W2117231490 date "1998-01-01" @default.
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- W2117231490 title "α-Subunit oxidation in T-state crystals of a sebacyl cross-linked human hemoglobin with unusual autoxidation properties" @default.
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- W2117231490 doi "https://doi.org/10.1016/s0301-4622(97)00096-3" @default.
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