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  • Title: Cloning and sequence analysis of the gene encoding Methylophilus methylotrophus cytochrome c", a unique protein with a perpendicular orientation of the histidinyl ligands.
    Author: Price NJ, Vijgenboom E, Ribeiro G, Costa JV, Canters GW, Santos H.
    Journal: Biochim Biophys Acta; 1999 Sep 01; 1413(1):55-61. PubMed ID: 10524262.
    Abstract:
    Cytochrome c" from Methylophilus methylotrophus is an unusual monohaem protein that undergoes a major redox-linked spin-state transition: one of the two axial histidines bound to the iron in the oxidised form is detached upon reduction and a proton is taken up. A 3.5-kb DNA fragment, containing the gene encoding cytochrome c" (cycA), has been cloned and sequenced. The cytochrome c" gene codes for a pre-protein with a typical prokaryotic 20-residue signal sequence, suggesting that the protein is synthesised as a precursor which is processed during its secretion into the periplasm. The C-terminus of cytochrome c" has homology with the corresponding region of an oxygen-binding haem protein (SHP) from phototrophically grown Rhodobacter sphaeroides. SHP is similar in size and in the location of its haem-binding site. Immediately downstream from cytochrome c" a second open reading frame (ORF) codes for a 23-kDa protein with similarity to the cytochrome b-type subunit of Ni-Fe hydrogenase. The possibility of coordinated expression of cycA and this ORF is discussed.
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