Abstract:ABSTRACT. The kinetics of the reaction of 5,5'-dithiobis(2-nitrobenzoate) with guinea pig oxy-and carbonmonoxyhaemoglobin are biphasic. The two phases differ in rate by two orders of magnitude. For the fast phase, quantitative analysis of the pH dependence of the apparent second order rate constant, kapp, shows that it has all the characteristics associated with the reaction of CysF9 (93)β, a sulphydryl group that is invariant in all mammalian haemoglobins. The slow kinetic phase is assigned to CysH3(125)β. Qu… Show more
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