Double mixing stopped-flow method for the study of equilibria and kinetics of dimer-tetramer association of hemoglobins: Studies on Hb Carp, Hb A, and Hb Rothschild
✍ Scribed by Marjaneh Berjis; Vijay S. Sharma
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 665 KB
- Volume
- 196
- Category
- Article
- ISSN
- 0003-2697
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✦ Synopsis
A double mixing stopped-flow method is described for studying the dimer-tetramer equilibria of oxyhemoglobins and the kinetics of association of unliganded dimers. The three hemoglobins studied were: Hb Carp, Hb A, and Hb Rothschild (Trp beta 37 (C3)----Arg). The new method reproduces the data obtained for oxyHb A by other established methods. In agreement with previous studies, the new method indicates little, if any, dissociation of oxyHb carp into dimers even in 2 M urea solutions (0.1 M Bis-Tris pH 7.0). OxyHb Rothschild, on the other hand, is extensively dissociated into dimers (K(Hb4L4 in equilibrium with 2Hb2) = 37.3 x 10(-6) M) and the rate constant for the association of deoxy dimers of Hb Rothschild is about one-tenth of the value for Hb A indicating that the deoxy tetramer of Hb Rothschild is at least 10 times more dissociated into dimers than deoxyHb A.