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  • From solution to structure:...
    Mueller-Dieckmann, Christoph; Grinzato, Alessandro; Effantin, Grégory; Fenel, Daphna; Flot, David; Schoehn, Guy; Leonard, Gordon; Kandiah, Eaazhisai

    Journal of applied crystallography, April 2024, Letnik: 57, Številka: 2
    Journal Article

    In addressing the challenges faced by laboratories and universities with limited (or no) cryo‐electron microscopy (cryo‐EM) infrastructure, the ESRF, in collaboration with the Grenoble Institute for Structural Biology (IBS), has implemented the cryo‐EM Solution‐to‐Structure (SOS) pipeline. This inclusive process, spanning grid preparation to high‐resolution data collection, covers single‐particle analysis and cryo‐electron tomography (cryo‐ET). Accessible through a rolling access route, proposals undergo scientific merit and technical feasibility evaluations. Stringent feasibility criteria demand robust evidence of sample homogeneity. Two distinct entry points are offered: users can either submit purified protein samples for comprehensive processing or initiate the pipeline with already vitrified cryo‐EM grids. The SOS pipeline integrates negative stain imaging (exclusive to protein samples) as a first quality step, followed by cryo‐EM grid preparation, grid screening and preliminary data collection for single‐particle analysis, or only the first two steps for cryo‐ET. In both cases, if the screening steps are successfully completed, high‐resolution data collection will be carried out using a Titan Krios microscope equipped with a latest‐generation direct electron counting detector coupled to an energy filter. The SOS pipeline thus emerges as a comprehensive and efficient solution, further democratizing access to cryo‐EM research. The European Synchrotron's Solution‐to‐Structure (SOS) pipeline streamlines cryo‐EM studies, providing an inclusive process from grid preparation to high‐resolution data collection for single‐particle analysis and cryo‐electron tomography. This service is especially tailored for users with restricted or no access to cryo‐EM infrastructure, enabling them to conduct screening experiments and acquire samples suitable for high‐resolution data collection.