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. 1991 Jan;173(1):220–228. doi: 10.1128/jb.173.1.220-228.1991

Cloning, sequencing, and expression of the gene encoding the high-molecular-weight cytochrome c from Desulfovibrio vulgaris Hildenborough.

W B Pollock 1, M Loutfi 1, M Bruschi 1, B J Rapp-Giles 1, J D Wall 1, G Voordouw 1
PMCID: PMC207178  PMID: 1846136

Abstract

By using a synthetic deoxyoligonucleotide probe designed to recognize the structural gene for cytochrome cc3 from Desulfovibrio vulgaris Hildenborough, a 3.7-kb XhoI genomic DNA fragment containing the cc3 gene was isolated. The gene encodes a precursor polypeptide of 58.9 kDa, with an NH2-terminal signal sequence of 31 residues. The mature polypeptide (55.7 kDa) has 16 heme binding sites of the form C-X-X-C-H. Covalent binding of heme to these 16 sites gives a holoprotein of 65.5 kDa with properties similar to those of the high-molecular-weight cytochrome c (Hmc) isolated from the same strain by Higuchi et al. (Y. Higuchi, K. Inaka, N. Yasuoka, and T. Yagi, Biochim. Biophys. Acta 911:341-348, 1987). Since the data indicate that cytochrome cc3 and Hmc are the same protein, the gene has been named hmc. The Hmc polypeptide contains 31 histidinyl residues, 16 of which are integral to heme binding sites. Thus, only 15 of the 16 hemes can have bis-histidinyl coordination. A comparison of the arrangement of heme binding sites and coordinated histidines in the amino acid sequences of cytochrome c3 and Hmc from D. vulgaris Hildenborough suggests that the latter contains three cytochrome c3-like domains. Cloning of the D. vulgaris Hildenborough hmc gene into the broad-host-range vector pJRD215 and subsequent conjugational transfer of the recombinant plasmid into D. desulfuricans G200 led to expression of a periplasmic Hmc gene product with covalently bound hemes.

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Selected References

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