The structure of the soluble domain of an archaeal Rieske iron-sulfur protein at 1.1 A resolution.Bonisch, H., Schmidt, C.L., Schafer, G., Ladenstein, R.
(2002) J.Mol.Biol. 319: 791-805
- PubMed: 12054871
- DOI: 10.1016/S0022-2836(02)00323-6
- PubMed Abstract:
- Expression of the Sulfolobus acidocaldarius Rieske iron sulfur protein II (soxF) with the correctly inserted [2Fe-2S] cluster in Escherichia coli
Schmidt, C.L.,Hatzfeld, O.M.,Petersen, A.,Link, T.A.,Schaefer, G.
(1997) Biochem.Biophys.Res.Commun. 234: 283
- Crystallization and preliminary crystallographic analysis of Rieske iron-sulfur protein II (soxF) from Sulfolobus acidocaldarius
Boenisch, H.,Schmidt, C.L.,Schaefer, G.,Ladenstein, R.
(2000) Acta Crystallogr.,Sect.D 56: 643
The first crystal structure of an archaeal Rieske iron-sulfur protein, the soluble domain of Rieske iron-sulfur protein II (soxF) from the hyperthermo-acidophile Sulfolobus acidocaldarius, has been solved by multiple wavelength anomalous dispersion ( ...
The first crystal structure of an archaeal Rieske iron-sulfur protein, the soluble domain of Rieske iron-sulfur protein II (soxF) from the hyperthermo-acidophile Sulfolobus acidocaldarius, has been solved by multiple wavelength anomalous dispersion (MAD) and has been refined to 1.1 A resolution. SoxF is a subunit of the terminal oxidase supercomplex SoxM in the plasma membrane of S. acidocaldarius that combines features of a cytochrome bc(1) complex and a cytochrome c oxidase. The [2Fe-2S] cluster of soxF is most likely the primary electron acceptor during the oxidation of caldariella quinone by the cytochrome a(587)/Rieske subcomplex. The geometry of the [2Fe-2S] cluster and the structure of the cluster-binding site are almost identical in soxF and the Rieske proteins from eucaryal cytochrome bc(1) and b(6)f complexes, suggesting a strict conservation of the catalytic mechanism. The main domain of soxF and part of the cluster-binding domain, though structurally related, show a significantly divergent structure with respect to topology, non-covalent interactions and surface charges. The divergent structure of soxF reflects a different topology of the soxM complex compared to eucaryal bc complexes and the adaptation of the protein to the extreme ambient conditions on the outer membrane surface of a hyperthermo-acidophilic organism.
Department of Biosciences at NOVUM, Center for Structural Biochemistry, Karolinska Institutet, Hälsovägen 7-9, S-14157 Huddinge, Sweden.