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- W2077917529 abstract "Asymmetrical cross-linked FS (alpha 2 gamma beta s) hybrid hemoglobin (Hb FS-fumarate) was prepared by reacting mixtures of hemoglobins F and S with double-headed aspirin, bis(3,5-dibromosalicyl) fumarate. When the molar ratio of hemoglobin to the cross-linking agent was 1 to 2 in a 1:1 FS mixture, the relative ratio of the products, cross-linked hemoglobins F (Hb F-fumarate), FS (HB FS-fumarate), and S (Hb S-fumarate), was 1.0:2.6:2.0, in contrast to a 1:2:1 ratio of cross-linked hemoglobins A, AS, and S in a 1:1 AS mixture. These results suggest that the fumaryl group reacts differently with Hb F, Hb FS and Hb S, and that the difference could be attributed to the difference in the structure in the vicinity of the EF6 Lys of non alpha-chains. The oxygen-binding properties of Hb F-fumarate, Hb FS-fumarate, and Hb S-fumarate were similar, except that the n-value of Hb F-fumarate was slightly lower than n-values of Hb S-fumarate and Hb FS-fumarate. Kinetic studies on aggregation showed that the addition of Hb FS-fumarate to unmodified Hb S did not affect the delay time prior to aggregation, but did increase the total turbidity. Electrophoretic and densitometric scanning analysis of the aggregate phase of this mixture showed the fraction of Hb FS-fumarate to be 19%. Hb F-fumarate's effect on the delay time is concentration-dependent; the greater the concentration of Hb F-fumarate, the longer the delay time. The turbidity after aggregation of the mixture of Hb S and Hb F-fumarate was much less than that of Hb S and Hb FS-fumarate. However, the fraction of Hb F-fumarate in the aggregate phase was 19%, which is similar to that of Hb FS-fumarate. These data suggest that Hb F and FS hybrid hemoglobin cannot participate in nuclei formation, but can participate in aggregation after sufficient amounts of nuclei are formed from Hb S, and that increased levels of Hb F do not have an inhibitory effect on the formation of nuclei but on the growth of aggregates." @default.
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- W2077917529 date "1985-05-01" @default.
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- W2077917529 title "Effect of FS (α2γβs) hybrid hemoglobin on Hb S nucleation and aggregation" @default.
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- W2077917529 doi "https://doi.org/10.1016/0167-4838(85)90072-x" @default.
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