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The structural properties of a key transient oxygen intermediate of cytochrome c oxidase, P R , remain an enigma, although inferences have been drawn from its equilibrium analogues, PCO/O2, P H and P M . With resonance Raman spectroscopy, an oxygen isotope-sensitive band at 806cm −1 was observed in PCO/O2 produced by adding CO and O 2 to the resting enzyme....
Hemoglobins have been discovered in organisms from virtually all kingdoms. Their presence in unicellular organisms suggests that the gene for hemoglobin is very ancient and that the hemoglobins must have functions other than oxygen transport, in view of the fact that O 2 delivery is a diffusion-controlled process in these organisms. Based on sequence alignment, three groups of hemoglobins...
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