What question did this study set out to answer?

This research aims to improve the resolution of small protein structures determined by cryo-EM using a laser phase plate.

June 13, 2026

Laser phase plate improves structure determination of small proteins by cryo-EM

Key Points

This research aims to improve the resolution of small protein structures determined by cryo-EM using a laser phase plate.
Implemented a laser phase plate in a Titan Krios microscope
Enhanced specimen-motion correction and early frame information recovery
Utilized standard defocus ranges and reconstruction procedures
Achieved significant improvements in single-particle reconstruction resolution
Enhanced particle visualization and alignment
Facilitated 3D classification leading to clearer structural data

Abstract

Phase plates can in principle overcome the poor image contrast in electron cryo–microscopy (cryo-EM) and the resulting limits on the structural reconstruction of small proteins. However, previous designs have been unstable and compromised the high-resolution signal. They have thus been unable to surpass results achieved by standard cryo-EM. Here, we show that the laser phase plate (LPP), installed in a custom, modern Titan Krios microscope, enhances the resolution in single-particle reconstruction of small proteins by improving specimen-motion correction, recovery of information from the early frames, as well as particle visualization, 3D classification, and alignment. These advances use standard defocus ranges and reconstruction procedures, but open the door to LPP-tailored protocols offering further improvements by leveraging the LPP demonstrated here.

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