Rubredoxin biological function

The biological function of these proteins is summarized in Table II. The biological function of rubredoxin isolated from the clostridia is not known. Lovenberg and Sobel (I) first isolated the beautiful crystals as... 

The function of the electron-mediating proteins which contain a single redox active site (e.g., rubredoxin, azurins, flavodoxins, plasto-cyanins) is mainly related to the first aspect. Still, the pronounced specificity encountered in their function in biological energy conversion processes indicates that their redox center, often a transition metal ion, is embedded in an evolutionarily optimized polypeptide envelope. The... 

Iron-sulfur proteins occur in animal, plant, and bacterial cells. The proteins are characterized by the presence of 1-0, 2-2, 4rA, 6-6, or 8-8 atoms of iroursulfide. Only the structure of clostridial rubredoxin, a 1-0 protein, is knoum. It contains iron ligated to four sulfur atoms of cysteine residues of the polypeptide. With the exception of the ""high potential iron protein, all the proteins show unexpectedly low redox potentials and function in biological oxidationr-reduc-tion reactions. 

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