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J. Biol. Chem., Vol. 262, Issue 7, 3123-3131, 03, 1987

Amino acid sequence of the monomer subunit of the extracellular hemoglobin of Lumbricus terrestris

F Shishikura, JW Snow, T Gotoh, SN Vinogradov and DA Walz

The giant extracellular hemoglobin (3,800 kDa) of the oligochaete Lumbricus terrestris consists of four subunits: a monomer (chain I), two subunits each of about 35 kDa (chains V and VI), and a disulfide- bonded trimer (50 kDa) of chains II, III, and IV. The complete amino acid sequence of chain I was determined: it consists of 142 amino acid residues and has a molecular weight of 16,750 including a heme group. Fifty-nine residues (42%) were found to be identical with those in the corresponding positions in Lumbricus chain II (Garlick, R. L., and Riggs, A. F. (1982) J. Biol. Chem. 257, 9005-9015); 45 (32%), 56 (40%), 44 (31%), and 45 (32%) residues were found to be in identical positions in the sequences of chains I, IIA, IIB, and IIC, respectively, of Tylorrhynchus heterochaetus hemoglobin (Suzuki, T., and Gotoh, T. (1986) J. Biol. Chem. 261, 9257-9267). When the sequences of all six annelid chains are compared, 18 invariant residues are found in the first 104 residues of the molecule; very little homology exists among the annelid chains in the carboxyl-terminal 38-residue region. Nine of the 18 invariant residues are also found in the human beta-globin chain.
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