[No authors listed]
The amino acid sequences of human, porcine, and bovine erythrocyte cytochromes b5 which are soluble and present in the cytosol have been determined. In addition, the partial sequences of microsome-bound liver cytochrome b5, namely the sequence of the N-terminal region and joint region between the heme-containing and membranous part, have been established for human and porcine sources. All the cytochromes b5 from erythrocyte and liver contained N-acetylated N-termini. Of the 97 amino acid residues of erythrocyte cytochrome b5, residues 1-96 were identical with those of the liver protein of the same species. However, residue 97 (C-terminal residue) was proline for human erythrocyte cytochrome b5 and serine for the porcine protein, while residues 97 (joint region) of human and porcine liver cytochromes b5 were threonine. These findings indicate that the two forms of cytochrome b5 are encoded by two different but closely related mRNAs.
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