Download MendeleyRefined crystal structure of ferredoxin II from Desulfovibrio gigas at 1.7 A.
Kissinger, C.R., Sieker, L.C., Adman, E.T., Jensen, L.H.(1991) J Mol Biol 219: 693-715
- PubMed: 2056535
- DOI: https://doi.org/10.1016/0022-2836(91)90665-s
- Primary Citation of Related Structures:
1FXD - PubMed Abstract:
The crystal structure of ferredoxin II from Desulfovibrio gigas has been determined using phasing from anomalous scattering data at a resolution of 1.7 A and refined to an R-factor of 0.157. The molecule has an overall chain fold similar to that of the other bacterial ferredoxins of known structure. The molecule contains a single 3Fe-4S cluster with geometry indistinguishable from the 4Fe-4S clusters, and a disulfide bond near the site corresponding to the position of the second cluster of two-cluster ferredoxins. The cluster is bound by cysteine residues 8, 14 and 50. The side-chain of cysteine 11 extends away from the cluster, but could rotate to become the fourth cysteine ligand in the four-iron form of the molecule given a local adjustment of the polypeptide chain. This residue is modified, however, by what appears to be a methanethiol group. There are a total of eight NH . . . S bonds to the inorganic and cysteine sulfur atoms of the Fe-S cluster. There is an additional residue found that is not reported for the chemical sequence: according to the electron density a valine residue should be inserted after residue 55.
Organizational Affiliation:
Department of Biological Structure, University of Washington, Seattle 98195.
