Please be patient while the structures in the left frame load. In order to display all of the structures in the tour properly, press 'View' buttons below in order (from 1 to the end).
This is a display of the X-ray structure of a [2Fe-2S] ferredoxin from the plant S. platensis.
3+ ions and two bridging S2- (sulfides) which is bound to the protein by coordination to four cysteine sulfurs. The sequence Cys-X-X-Cys is characteristic of iron-sulfur clusters. The two iron ions are in a tetrahedral coordination environment. The [Fe2S2(S-Cys)4]2- cluster serves as a simple electron carrier. The cluster is at the surface of this small protein to make electron transfer rapid.