Download MendeleyMagIC-Cryo-EM, structural determination on magnetic beads for scarce macromolecules in heterogeneous samples.
Arimura, Y., Konishi, H.A., Funabiki, H.(2025) Elife 13
- PubMed: 40390365
- DOI: https://doi.org/10.7554/eLife.103486
- Primary Citation of Related Structures:
8VHI, 8VHJ, 8VHK - PubMed Abstract:
Cryo-EM single-particle analyses typically require target macromolecule concentration at 0.05~5.0 mg/ml, which is often difficult to achieve. Here, we devise Ma g netic I solation and C oncentration (MagIC)-cryo-EM, a technique enabling direct structural analysis of targets captured on magnetic beads, thereby reducing the targets' concentration requirement to <0.0005 mg/mL. Adapting MagIC-cryo-EM to a Chromatin Immunoprecipitation protocol, we characterized structural variations of the linker histone H1.8-associated nucleosomes that were isolated from interphase and metaphase chromosomes in Xenopus egg extract. Combining Du plicated S election T o E xclude R ubbish particles (DuSTER), a particle curation method that excludes low signal-to-noise ratio particles, we also resolved the 3D cryo-EM structures of nucleoplasmin NPM2 co-isolated with the linker histone H1.8 and revealed distinct open and closed structural variants. Our study demonstrates the utility of MagIC-cryo-EM for structural analysis of scarce macromolecules in heterogeneous samples and provides structural insights into the cell cycle-regulation of H1.8 association to nucleosomes.
- Laboratory of Chromosome and Cell Biology, The Rockefeller University, New York, United States.
Organizational Affiliation:
