THERMATOGA MARITIMA IscU IS A STRUCTURED IRON-SULFUR CLUSTER ASSEMBLY PROTEIN June 14, 2002 The Journal of Biological Chemistry, 277, 21397-21404.
His-tagged Iron cluster that runs as a doublet. Mass-spec show they are the same species. They concluded "that the protein binds SDS in two stoichiometries and therefore runs as a doublet" as seen for the OmpA protein (references are in the paper). Hope that helps. Dan
