Haemoglobins of the Shark, Heterodontus portusjacksoni III. Amino Acid Sequence of the ß -Chain

Abstract

The amino acid sequence of the ß-chain of the principal haemoglobin from the shark H. portusjacksoni has been determined. The chain has 141 residues, the same as that of mammalian IX-chains and less than the 146 residues of mammalian ß-chains or the 148 residues of the IX-chain from the tetrameric shark haemoglobin. The sequence was deduced from the sequences of peptides obtained by digestion of the globin or its cyanogen bromide fragments with trypsin, chymotrypsin, pepsin and papain.