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Desulfuromonas acetoxidans

ABSTRACT: Sulfur-reducing marine bacterium

PROVIDER: PRJNA35351 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	AAEW02.dat.gz	Other
	AAEW02.fasta.gz	Fasta.gz
	AAEW02.master.dat	Other
	JABWTF01.dat.gz	Other

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NMR characterization and solution structure determination of the oxidized cytochrome c7 from Desulfuromonas acetoxidans.

Project description:The solution structure of the three-heme electron transfer protein cytochrome c7 from Desulfuromonas acetoxidans is reported. The determination of the structure is obtained through NMR spectroscopy on the fully oxidized, paramagnetic form. The richness of structural motifs and the presence of three prosthetic groups in a protein of 68 residues is discussed in comparison with the four-heme cytochromes c3 already characterized through x-ray crystallography. In particular, the orientation of the three hemes present in cytochrome c7 is similar to that of three out of four hemes of cytochromes c3. The reduction potentials of the individual hemes, which have been obtained through the sequence-specific assignment of the heme resonances, are discussed with respect to the properties of the protein matrix. This information is relevant for any attempt to understand the electron transfer pathway.

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The Desulfuromonas acetoxidans triheme cytochrome c7 produced in Desulfovibrio desulfuricans retains its metal reductase activity.

Project description:Multiheme cytochrome c proteins that belong to class III have been recently shown to exhibit a metal reductase activity, which could be of great environmental interest, especially in metal bioremediation. To get a better understanding of these activities, the gene encoding cytochrome c7 from the sulfur-reducing bacterium Desulfuromonas acetoxidans was cloned from genomic DNA by PCR and expressed in Desulfovibrio desulfuricans G201. The expression system was based on the cyc transcription unit from Desulfovibrio vulgaris Hildenborough and led to the synthesis of holocytochrome c7 when transferred by electrotransformation into the sulfate reducer Desulfovibrio desulfuricans G201. The produced cytochrome was indistinguishable from the protein purified from Desulfuromonas acetoxidans cells with respect to several biochemical and biophysical criteria and exhibited the same metal reductase activities as determined from electrochemical experiments. This suggests that the molecule was correctly folded in the host organism. Desulfovibrio desulfuricans produces functional multiheme c-type cytochromes from bacteria belonging to a different genus and may be considered a suitable host for the heterologous biogenesis of multiheme c-type cytochromes for either structural or engineering studies. This report, which presents the first example of the transformation of a Desulfovibrio desulfuricans strain by electrotransformation, describes work that is the first necessary step of a protein engineering program that aims to specify the structural features that are responsible for the metal reductase activities of multiheme cytochrome c7.

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Syntrophotalea carbinolica

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