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J. Biol. Chem., Vol. 260, Issue 5, 2752-2756, 03, 1985

Geminate recombination of CO in rabbit, opossum, and adult hemoglobins

BF Campbell, D Magde and VS Sharma

The geminate recombination of CO with Hb following dissociation by a 10- ns laser pulse has been studied as a function of pH (9.2 and 7.0 without inositol hexaphosphate and 6.0 with inositol hexaphosphate) and temperature (5-35 degrees C). The hemoglobins studied included adult, Rothschild, rabbit, opossum, and carp. Despite significant differences in their structural and functional properties, the first four of these hemoglobins show similar trends in the yields, rates, and activation energies of the geminate recombination. The nature of the "cage recombination" in hemoglobin is discussed in the light of such findings. Neither a slow diffusion model nor a model based upon a specific non-heme binding site accounts for the observations.
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