An amino acid sequence is proposed for the cytochrome c-554(547) from the bacterium Thiobacillus neapolitanus N.C.I.B. 8539). It consists of a polypeptide chain of 91 residues, with a pair of haem-attachment cysteine residues at positions 15 and 18. There is similarity in sequence with each of the halves of the sequence of the dihaem cytochromes c4 and with a cytochrome c-554(548) from a halophilic strain of Paracoccus. Detailed evidence for the amino acid sequence of the protein has been deposited as Supplementary Publication SUP 50127 (11 pages) at the British Library (Lending Division), Boston Spa, Wetherby, West Yorkshire LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem. J. (1985) 225, 5.

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