title: Metal-substituted derivatives of the rubredoxin from Clostridium pasteurianum.
abstract: Five different metal-substituted forms of Clostridium pasteurianum rubredoxin have been prepared and crystallized. The single Fe atom present in the Fe(S-Cys)(4) site of the native form of the protein was exchanged in turn for Co, Ni, Ga, Cd and Hg. All five forms of rubredoxin crystallized in space group R3 and were isomorphous with the native protein. The Co-, Ni- and Ga-substituted proteins exhibited metal sites with geometries similar to that of the Fe form (effective D(2d) local symmetry), as did the Cd and Hg proteins, but with a significant expansion of the metal-sulfur bond lengths. A knowledge of these structures contributes to a molecular understanding of the function of this simple iron-sulfur electron-transport protein.
authors.affiliation: School of Molecular and Microbial Biosciences, University of Sydney, New South Wales 2006, Australia. m.maher@mmb.usyd.edu.au
authors.forename: Megan
authors.initials: M
authors.lastname: Maher
authors.forename: Maddalena
authors.initials: M
authors.lastname: Cross
authors.forename: Matthew C J
authors.initials: MC
authors.lastname: Wilce
authors.forename: J Mitchell
authors.initials: JM
authors.lastname: Guss
authors.forename: Anthony G
authors.initials: AG
authors.lastname: Wedd
mesh_terms: D001426:Bacterial Proteins; D001665:Binding Sites; D001692:Biological Transport; D002104:Cadmium / Q000737:chemistry; D003013:Clostridium / Q000378:metabolism*; D003035:Cobalt / Q000737:chemistry; D018360:Crystallography, X-Ray; D019992:Databases as Topic; D004583:Electrons; D004926:Escherichia coli / Q000378:metabolism; D005708:Gallium / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D007506:Iron-Sulfur Proteins / Q000737:chemistry; D008628:Mercury / Q000737:chemistry; D008670:Metals / Q000737:chemistry; D008958:Models, Molecular; D009532:Nickel / Q000737:chemistry; D011487:Protein Conformation; D012416:Rubredoxins / Q000737:chemistry* / Q000378:metabolism; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D001426:Bacterial Proteins; D007506:Iron-Sulfur Proteins; D008670:Metals; D012416:Rubredoxins; D002104:Cadmium; C077196:rubredoxin protein, Clostridium pasteurianum; D003035:Cobalt; D009532:Nickel; D005708:Gallium; D007501:Iron; D008628:Mercury