Routine sub-2.5 Å cryo-EM structure determination of GPCRs

Radostin Danev, Matthew Belousoff, Yi Lynn Liang, Xin Zhang, Fabian Eisenstein, Denise Wootten, Patrick M. Sexton

Research output: Contribution to journalArticleResearchpeer-review

26 Citations (Scopus)

Abstract

Cryo-electron microscopy (cryo-EM) of small membrane proteins, such as G protein-coupled receptors (GPCRs), remains challenging. Pushing the performance boundaries of the technique requires quantitative knowledge about the contribution of multiple factors. Here, we present an in-depth analysis and optimization of the main experimental parameters in cryo-EM. We combined actual structural studies with methods development to quantify the effects of the Volta phase plate, zero-loss energy filtering, objective lens aperture, defocus magnitude, total exposure, and grid type. By using this information to carefully maximize the experimental performance, it is now possible to routinely determine GPCR structures at resolutions better than 2.5 Å. The improved fidelity of such maps enables the building of better atomic models and will be crucial for the future expansion of cryo-EM into the structure-based drug design domain. The optimization guidelines given here are not limited to GPCRs and can be applied directly to other small proteins.

Original languageEnglish
Article number4333
Number of pages10
JournalNature Communications
Volume12
Issue number1
DOIs
Publication statusPublished - Dec 2021

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