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Hemoglobins of the tadpole of the bullfrog, Rana catesbeiana. Amino acid sequence of the alpha chain of a major component


, : Hemoglobins of the tadpole of the bullfrog, Rana catesbeiana. Amino acid sequence of the alpha chain of a major component. Journal of Biological Chemistry 255(8): 3285-3293

The complete amino acid sequence has been determined for the alpha chain of component III of the hemoglobin of the tadpole of the bullfrog, Rana catesbeiana. The chain comprises 141 residues of which 80 (57%) are identical to those in the corresponding positions of the human chain. Almost the same extent of similarity exists in the comparison with the sequenced part of the alpha chain of the adult bullfrog. The major features of this chain are: 1) each residue which is common to all other alpha chains of known sequence is also found in this alpha chain; 2) an acetylated NH2 terminus prevents formation of one of the salt bridges found in human hemoglobin which is responsible for part of the alkaline Bohr effect in mammalian hemoglobins; and 3) a prolyl residue at alpha 99 (G6) must distort the G helix.

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PMID: 6965939


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