title: EXAFS structural study of FX, the low-potential Fe-S center in photosystem I.
abstract: We present iron extended X-ray absorption fine structure (EXAFS) spectra of a photosystem I core preparation containing FX, the very low potential iron-sulfur cluster in photosystem I. The preparation lacks FA and FB. The amplitude of Fe-Fe backscattering in the EXAFS spectrum indicates that FX may be a [4Fe-4S] cluster and is not a [2Fe-2S] cluster or clusters.
authors.affiliation: Laboratory of Chemical Biodynamics, Lawrence Berkeley Laboratory, University of California, Berkeley 94720.
authors.forename: A E
authors.initials: AE
authors.lastname: McDermott
authors.forename: V K
authors.initials: VK
authors.lastname: Yachandra
authors.forename: R D
authors.initials: RD
authors.lastname: Guiles
authors.forename: K
authors.initials: K
authors.lastname: Sauer
authors.forename: M P
authors.initials: MP
authors.lastname: Klein
authors.forename: K G
authors.initials: KG
authors.lastname: Parrett
authors.forename: J H
authors.initials: JH
authors.lastname: Golbeck
mesh_terms: D002734:Chlorophyll / Q000032:analysis*; D005583:Fourier Analysis; D007501:Iron / Q000032:analysis* / Q000378:metabolism; D045342:Light-Harvesting Protein Complexes; D010788:Photosynthesis; D045322:Photosynthetic Reaction Center Complex Proteins; D045331:Photosystem I Protein Complex; D010940:Plant Proteins / Q000032:analysis*; D013052:Spectrometry, X-Ray Emission; D013455:Sulfur / Q000378:metabolism*
chemical_list: D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D045331:Photosystem I Protein Complex; D010940:Plant Proteins; D002734:Chlorophyll; D013455:Sulfur; D007501:Iron