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Default NMR assignments and relaxation studies of Thiobacillus versutus ferrocytochrome c-550

NMR assignments and relaxation studies of Thiobacillus versutus ferrocytochrome c-550 indicate the presence of a highly mobile 13-residues long C-terminal tail.

Related Articles NMR assignments and relaxation studies of Thiobacillus versutus ferrocytochrome c-550 indicate the presence of a highly mobile 13-residues long C-terminal tail.

Protein Sci. 1996 Dec;5(12):2494-505

Authors: Ubbink M, Pfuhl M, van der Oost J, Berg A, Canters GW

Cytochrome c-550 of Thiobacillus versutus functions as an electron transfer protein in a chain of redox proteins that enables T. versutus to grow on methylamine. It is a single-heme protein of 134 residues, related to mitochondrial cytochrome c. Cytochrome c-550, as well as several other bacterial c2-type cytochromes, contain a C-terminal extension of 13-16 amino acids of unknown function, compared to mitochondrial cytochrome c. NMR experiments were performed to obtain structural and dynamic information on the protein in solution. For this purpose, T. versutus cytochrome c-550 was labeled with 15N and 13C using 13C-methanol grown Paracoccus denitrificans as a host for heterologous expression. NMR assignments were obtained for the 1H, 15N, and 13C nuclei in the backbone and the beta-positions of the protein and the secondary structure was determined. 15N-relaxation studies were performed to characterize the dynamic properties of the protein. The results indicate that the main part of T. versutus ferrocytochrome c-550 exists in solution as a rigid, well-ordered molecule with a secondary structure that is very similar to that of P. denitrificans cytochrome c-550, as observed in crystals. The C-terminal extension, however, is unstructured and highly mobile. The possible origin and function of the extension are discussed.

PMID: 8976558 [PubMed - indexed for MEDLINE]



Source: PubMed
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