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Sökning: WFRF:(Sokaras D.) > (2014)

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1.
  • Hattne, Johan, et al. (författare)
  • Accurate macromolecular structures using minimal measurements from X-ray free-electron lasers
  • 2014
  • Ingår i: Nature Methods. - 1548-7091 .- 1548-7105. ; 11:5, s. 545-548
  • Tidskriftsartikel (refereegranskat)abstract
    • X-ray free-electron laser (XFEL) sources enable the use of crystallography to solve three-dimensional macromolecular structures under native conditions and without radiation damage. Results to date, however, have been limited by the challenge of deriving accurate Bragg intensities from a heterogeneous population of microcrystals, while at the same time modeling the X-ray spectrum and detector geometry. Here we present a computational approach designed to extract meaningful high-resolution signals from fewer diffraction measurements.
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2.
  • Hattne, Johan, et al. (författare)
  • Accurate macromolecular structures using minimal measurements from X-ray free-electron lasers
  • 2014
  • Ingår i: Nature Methods. - : Springer Science and Business Media LLC. - 1548-7091 .- 1548-7105. ; 11:5, s. 545-548
  • Tidskriftsartikel (refereegranskat)abstract
    • X-ray free-electron laser (XFEL) sources enable the use of crystallography to solve three-dimensional macromolecular structures under native conditions and without radiation damage. Results to date, however, have been limited by the challenge of deriving accurate Bragg intensities from a heterogeneous population of microcrystals, while at the same time modeling the X-ray spectrum and detector geometry. Here we present a computational approach designed to extract meaningful high-resolution signals from fewer diffraction measurements.
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3.
  • Kern, Jan, et al. (författare)
  • Taking snapshots of photosynthetic water oxidation using femtosecond X-ray diffraction and spectroscopy
  • 2014
  • Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 5, s. 4371-
  • Tidskriftsartikel (refereegranskat)abstract
    • The dioxygen we breathe is formed by light-induced oxidation of water in photosystem II. O-2 formation takes place at a catalytic manganese cluster within milliseconds after the photosystem II reaction centre is excited by three single-turnover flashes. Here we present combined X-ray emission spectra and diffraction data of 2-flash (2F) and 3-flash (3F) photosystem II samples, and of a transient 3F' state (250 mu s after the third flash), collected under functional conditions using an X-ray free electron laser. The spectra show that the initial O-O bond formation, coupled to Mn reduction, does not yet occur within 250 mu s after the third flash. Diffraction data of all states studied exhibit an anomalous scattering signal from Mn but show no significant structural changes at the present resolution of 4.5 angstrom. This study represents the initial frames in a molecular movie of the structural changes during the catalytic reaction in photosystem II.
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  • Resultat 1-3 av 3

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