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Träfflista för sökning "WFRF:(Nimmrich Amke 1995) srt2:(2020)"

Sökning: WFRF:(Nimmrich Amke 1995) > (2020)

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1.
  • Claesson, Elin, 1989, et al. (författare)
  • The primary structural photoresponse of phytochrome proteins captured by a femtosecond X-ray laser
  • 2020
  • Ingår i: eLife. - 2050-084X. ; 9
  • Tidskriftsartikel (refereegranskat)abstract
    • Phytochrome proteins control the growth, reproduction, and photosynthesis of plants, fungi, and bacteria. Light is detected by a bilin cofactor, but it remains elusive how this leads to activation of the protein through structural changes. We present serial femtosecond X-ray crystallographic data of the chromophore-binding domains of a bacterial phytochrome at delay times of 1 ps and 10 ps after photoexcitation. The data reveal a twist of the D-ring, which leads to partial detachment of the chromophore from the protein. Unexpectedly, the conserved so-called pyrrole water is photodissociated from the chromophore, concomitant with movement of the A-ring and a key signaling aspartate. The changes are wired together by ultrafast backbone and water movements around the chromophore, channeling them into signal transduction towards the output domains. We suggest that the observed collective changes are important for the phytochrome photoresponse, explaining the earliest steps of how plants, fungi and bacteria sense red light.
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2.
  • Panman, Matthijs R, 1983, et al. (författare)
  • Observing the Structural Evolution in the Photodissociation of Diiodomethane with Femtosecond Solution X-Ray Scattering
  • 2020
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 125:22
  • Tidskriftsartikel (refereegranskat)abstract
    • Resolving the structural dynamics of the initial steps of chemical reactions is challenging. We report the femtosecond time-resolved wide-angle x-ray scattering of the photodissociation of diiodomethane in cyclohexane. The data reveal with structural detail how the molecule dissociates into radicals, how the radicals collide with the solvent, and how they form the photoisomer. We extract how translational and rotational kinetic energy is dispersed into the solvent. We also find that 85% of the primary radical pairs are confined to their original solvent cage and discuss how this influences the downstream recombination reactions.
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  • Resultat 1-2 av 2

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