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JBC, Vol. 253, Issue 1, 238-241, Jan, 1978

Kinetics of carbon monoxide binding to singly reduced human methemoglobin

K. Ho, M. H. Klapper and L. M. Dorfman

The kinetics of reaction of singly reduced methemoglobin (HbFe3(3+)Fe2+) with carbon monoxide have been investigated by the pulse radiolysis method. The rate constant for carbon monoxide binding to this form of hemoglobin is 4.1 X 10(6) M-1 S-1 at 24 degrees in our solutions. This value compares with existing values for various forms of hemoglobin ranging from 4 X 10(6) to 6.5 X 10(6) M-1 S-1. Addition of inositol hexaphosphate to the solutions results in a lower rate constant for carbon monoxide binding amounting to 1.1 X 10(5) M-1 S-1.
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