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Sökning: WFRF:(Hoh H)

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  • Rundqvist, Jonas, et al. (författare)
  • High fidelity functional patterns of an extracellular matrix protein by electron beam-based inactivation
  • 2007
  • Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 0002-7863 .- 1520-5126. ; 129:1, s. 59-67
  • Tidskriftsartikel (refereegranskat)abstract
    • Controlling the organization of proteins on surfaces provides a powerful biochemical tool for determining how cells interpret the spatial distribution of local signaling molecules. Here, we describe a general high fidelity approach based on electron beam writing to pattern the functional properties of protein-coated surfaces at length scales ranging from tens of nanometers to millimeters. A silicon substrate is first coated with the extracellular matrix protein fibronectin, which is then locally inactivated by exposure to a highly focused electron beam. Biochemical inactivation of the protein is established by the loss of antibody binding to the fibronectin. Functional inactivation is determined by the inability of cells to spread or form focal adhesions on the inactivated substrate, resulting in cell shapes constrained to the pattern, while they do both (and are unconstrained) on the remaining fibronectin. These protein patterns have very high fidelity, and typical patterns agree with the input dimensions of the pattern to within 2%. Further, the feature edges are well defined and approach molecular dimensions in roughness. Inactivation is shown to be dose dependent with observable suppression of the specific binding at 2 mu C cm(-2) and complete removal of biochemical activity at similar to 50 mu C cm(-2) for 5 keV electrons. The critical dose for inactivation also depends on accelerating voltage, and complete loss of antibody binding was achieved at similar to 4-7 mu C cm(-2) for 1 keV electrons, which corresponds to similar to 50-90 electrons per cross-sectional area of a whole fibronectin dimer and similar to 2-4 electrons per type III fibronectin domain. AFM analysis of the pattern surfaces revealed that electron beam exposure does not remove appreciable amounts of material from the surface, suggesting that the patterning mechanism involves local inactivation rather than the ablation that has been observed in several organic thin film systems.
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  • Agirre, Jon, et al. (författare)
  • The CCP4 suite: integrative software for macromolecular crystallography
  • 2023
  • Ingår i: Acta Crystallographica Section D. - : INT UNION CRYSTALLOGRAPHY. - 2059-7983. ; 79, s. 449-461
  • Tidskriftsartikel (refereegranskat)abstract
    • The Collaborative Computational Project No. 4 (CCP4) is a UK-led international collective with a mission to develop, test, distribute and promote software for macromolecular crystallography. The CCP4 suite is a multiplatform collection of programs brought together by familiar execution routines, a set of common libraries and graphical interfaces. The CCP4 suite has experienced several considerable changes since its last reference article, involving new infrastructure, original programs and graphical interfaces. This article, which is intended as a general literature citation for the use of the CCP4 software suite in structure determination, will guide the reader through such transformations, offering a general overview of the new features and outlining future developments. As such, it aims to highlight the individual programs that comprise the suite and to provide the latest references to them for perusal by crystallographers around the world.
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