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Abstract
1. 1. The effects of guanosine triphosphate (GTP) † † GTP, guanosine triphosphate; ATP, adenosine triphosphate; DPG, 2,3-diphosphoglycerate Hb, hemoglobin. and adenosine triphosphate (ATP) on the oxygenation behavior of the two major hemoglobins of the American eel, Antuilla rostrata, were determined. 2. 2. Both phosphates lower the oxygen affinities of the individual hemoglobins but the effect of GTP is greater than that of ATP. 3. 3. The allosteric effect of these phosphates is more pronounced with HbI than with HbII. 4. 4. Combinations of GTP and ATP at intraerythrocytic ocnentrations lower the oxygen affinities of the pigments to a greater extent than either phosphate alone. 5. 5. Sodium chloride decreases the affinity of HbI but increases the affinity of HbII. 6. 6. The interaction between these phosphates and NaCl in modulating the oxygenation behavior of the multiple hemoglobins of marine and fresh-water eels is discussed.
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