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The hemoglobin A of the Blue-and-Yellow Macaw (Ara ararauna) was isolated and characterized. The complete amino-acid sequence of alpha A- and beta-chains is presented. In contrast to some adult avian hemoglobins already investigated, Blue-and-Yellow Macaw hemoglobin is homogenous and contains only one component: HbA. The minor component, HbD, which is usually present in the hemolysate of avian erythrocytes, could not be detected. There is no evidence for the expression of the alpha D-globin gene. Comparison of alpha A- and beta-chains from Blue-and-Yellow Macaw hemoglobin with corresponding chains from Greylag Goose hemoglobin shows 19 amino-acid exchanges between alpha A-chains and 6 between beta-chains. The structure-function relationships of hemoglobin chains and the evolutionary aspects are discussed in view of these results.

biological chemistry hoppe-seyler

The Primary Structure of α  A  - and β-Chains from Blue-and-Yellow Macaw  (Ara ararauna,  Psittaci) Hemoglobin. No Evidence for Expression of α  D  -Chains