Reduced hybrid cluster proteins (HCP) from Desulfovibrio desulfuricans ATCC 27774 and Desulfovibrio vulgaris (Hildenborough): X-ray structures at high resolution using synchrotron radiation

D Aragao, Sofia Macedo, EP Mitchell, CV Romao, MY Liu, C Frazao, LM Saraiva, AV Xavier, J LeGall, Walter M.A.M. van Dongen, WR Hagen, M Teixeira, MA Carrondo, P Lindley

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Abstract

The hybrid cluster proteins from the sulfate reducing bacteria Desulfovibrio desulfuricans ATCC 27774 (Dd) and Desulfovibrio vulgaris strain Hildenborough (Dv) have been isolated and crystallized anaerobically. In each case, the protein has been reduced with dithionite and the crystal structure of the reduced form elucidated using X-ray synchrotron radiation techniques at 1.25 Å and 1.55 Å resolution for Dd and Dv, respectively. Although the overall structures of the proteins are unchanged upon reduction, there are significant changes at the hybrid cluster centres. These include significant movements in the position of the iron atom linked to the persulfide moiety in the oxidized asisolated proteins and the sulfur atom of the persulfide itself. The nature of these changes is described and the implications with respect to the function of hybrid cluster proteins are discussed.
Original languageEnglish
Pages (from-to)540-548
Number of pages9
JournalJournal of Biological Inorganic Chemistry
Volume8
Issue number5
DOIs
Publication statusPublished - May 2003

Keywords

  • Desulfovibrio desulfuricans
  • Desulfovibrio vulgaris
  • high-resolution X-ray structures
  • hybrid cluster proteins
  • reduced forms

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