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• W2044466209 abstract "A set of variant human hemoglobins, each with an Ala or Gly substitution at a single residue, has been prepared, and the kinetics of their reactions with carbon monoxide have been measured. This reaction is rate-limited by the binding of the first CO to the deoxygenated T state of the protein. The magnitudes of the effects of the mutations on CO combination vary widely, and, with the exception of beta Y145, the residues with the most significant effects on these kinetics are found in the hinge region of the alpha 1 beta 2 interface. Mixed-metal hybrids, with zinc protoporphyrin IX in place of heme on both alpha or both beta subunits, were prepared for beta W37E, beta W37A, alpha Y140G, and alpha Y140A, hinge region variants causing large kinetic changes, and for beta Y145G. Such hybrids permit measurements of the kinetics of CO binding to only the heme-containing alpha or beta subunits within the unliganded hemoglobin tetramer. Mutations at beta 37 and alpha 140 have global effects on the T state, increasing the rates of CO binding to both types of subunits. Mutation of beta Y145 has a large effect on the beta subunits in the deoxygenated T state, but very little effect on the alpha subunits. Oxygen equilibria measurements on the crystalline T state of beta W37E also indicate large affinity increases in both subunits of this variant. The overall oxygen equilibria of the variant hemoglobins in solution are sensitive to numerous variables besides the properties of the deoxygenated T state. In contrast to CO combination kinetics, the residues whose alterations cause the largest changes in overall oxygen equilibria in solution are scattered seemingly randomly within the alpha 1 beta 2 interface." @default.
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• W2044466209 date "2001-09-22" @default.
• W2044466209 modified "2023-10-04" @default.
• W2044466209 title "Mutational Effects at the Subunit Interfaces of Human Hemoglobin: Evidence for a Unique Sensitivity of the T Quaternary State to Changes in the Hinge Region of the α1β2 Interface" @default.
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• W2044466209 doi "https://doi.org/10.1021/bi010988p" @default.
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