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In the cooperative, homodimeric hemoglobin from Scapharca inaequivalvis, HbI, the subunit interface is formed by the heme-carrying E and F helices and contains the only cysteine residue of the globin chain (Cys 92 , F2) in an area which changes from hydrophilic to hydrophobic upon oxygenation. Binding of organomercurials to Hbl is cooperative and entails major quaternary rearrangements...
The sequences of the A and B chains of the Scapharca inaequivalvis tetrameric hemoglobin (HbII) are reported. They are homologous to the corresponding chains of other Arcid hemoglobins. Moreover, a comparison of the present data with the sequence of the S. inaequivalvis dimeric hemoglobin (HbI), for which high-resolution X-ray data are available, allows the identification of the residues that direct...
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