Magnetic Isolation and Concentration cryo-electron microscopy (MagIC)

Magnetic Isolation and Concentration cryo-electron microscopy (MagIC): Recently, researchers in the U.S. developed a new technique called Magnetic Isolation and Concentration cryo-electron microscopy (MagIC) as an innovative workaround for enhancing imaging in structural biology.

• About MagIC : Enables imaging of samples 100 times more dilute than traditional methods by attaching molecules to 50-nanometer magnetic beads.

o These beads are clumped together using a magnet, physically concentrating the molecules and making them easily visible even at low magnification, which speeds up targeting in the microscope.

o The technique produces multiple usable images at very low molecule concentrations (~0.0005 mg/ml, reducing sample needs to just 5 nanograms per grid.

o Image quality is enhanced using DuSTER (Duplicated Selection To Exclude Rubbish), a computational workflow that selects particles twice to remove false positives and improve clarity.

• About Cryo-Electron Microscopy (Cryo-EM): An advanced electron microscopy technique that creates detailed 3D images of biomolecules by combining thousands of projections.

o It freezes samples at cryogenic temperatures (around -150°C), preserving their natural structure without damage.

o This allows scientists to visualize biological processes and molecular structures, such as viruses and protein complexes, at near-atomic resolution.