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  • in-cell NMRnuclear magnetic resonancecellular structural biologycellular environmentprotein interactions  (2)
  • quasicrystalssuperspace crystallographystructure analysisphasonsX-ray diffuse scattering  (2)
  • International Union of Crystallography (IUCr)  (4)
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  • International Union of Crystallography (IUCr)  (4)
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  • 1
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    International Union of Crystallography (IUCr)
    In: IUCrJ
    Publication Date: 2016-06-28
    Keywords: quasicrystalssuperspace crystallographystructure analysisphasonsX-ray diffuse scattering
    Electronic ISSN: 2052-2525
    Topics: Geosciences , Physics
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  • 2
    Publication Date: 2016-06-15
    Description: The detailed atomic structure of the binary icosahedral (i) ScZn7.33 quasicrystal has been investigated by means of high-resolution synchrotron single-crystal X-ray diffraction and absolute scale measurements of diffuse scattering. The average atomic structure has been solved using the measured Bragg intensity data based on a six-dimensional model that is isostructural to the i-YbCd5.7 one. The structure is described with a quasiperiodic packing of large Tsai-type rhombic triacontahedron clusters and double Friauf polyhedra (DFP), both resulting from a close-packing of a large (Sc) and a small (Zn) atom. The difference in chemical composition between i-ScZn7.33 and i-YbCd5.7 was found to lie in the icosahedron shell and the DFP where in i-ScZn7.33 chemical disorder occurs on the large atom sites, which induces a significant distortion to the structure units. The intensity in reciprocal space displays a substantial amount of diffuse scattering with anisotropic distribution, located around the strong Bragg peaks, that can be fully interpreted as resulting from phason fluctuations, with a ratio of the phason elastic constants K2/K1 = −0.53, i.e. close to a threefold instability limit. This induces a relatively large perpendicular (or phason) Debye–Waller factor, which explains the vanishing of `high-Qperp' reflections.
    Keywords: quasicrystalssuperspace crystallographystructure analysisphasonsX-ray diffuse scattering
    Electronic ISSN: 2052-2525
    Topics: Geosciences , Physics
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  • 3
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    International Union of Crystallography (IUCr)
    In: IUCrJ
    Publication Date: 2017-02-15
    Description: Classical structural biology approaches allow structural characterization of biological macromolecules in vitro, far from their physiological context. Nowadays, thanks to the wealth of structural data available and to technological and methodological advances, the interest of the research community is gradually shifting from pure structural determination towards the study of functional aspects of biomolecules. Therefore, a cellular structural approach is ideally needed to characterize biological molecules, such as proteins, in their native cellular environment and the functional processes that they are involved in. In-cell NMR is a new application of high-resolution nuclear magnetic resonance spectroscopy that allows structural and dynamical features of proteins and other macromolecules to be analyzed directly in living cells. Owing to its challenging nature, this methodology has shown slow, but steady, development over the past 15 years. To date, several in-cell NMR approaches have been successfully applied to both bacterial and eukaryotic cells, including several human cell lines, and important structural and functional aspects have been elucidated. In this topical review, the major advances of in-cell NMR are summarized, with a special focus on recent developments in eukaryotic and mammalian cells.
    Keywords: in-cell NMRnuclear magnetic resonancecellular structural biologycellular environmentprotein interactions
    Electronic ISSN: 2052-2525
    Topics: Geosciences , Physics
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  • 4
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    International Union of Crystallography (IUCr)
    In: IUCrJ
    Publication Date: 2017-02-24
    Keywords: in-cell NMRnuclear magnetic resonancecellular structural biologycellular environmentprotein interactions
    Electronic ISSN: 2052-2525
    Topics: Geosciences , Physics
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