7KA4

Aldolase, rabbit muscle (beam-tilt refinement x4)

Summary for 7KA4

• Entry DOI: 10.2210/pdb7ka4/pdb
• EMDB information: 22758
• Descriptor: Fructose-bisphosphate aldolase A (1 entity in total)
• Functional Keywords: glycolysis, gluconeogenesis, carbohydrate degradation, homotetramer, lyase
• Biological source: Oryctolagus cuniculus (Rabbit)
• Total number of polymer chains: 4
• Total formula weight: 157054.69

Authors

Kearns, S.K.,Cash, J.N.,Cianfrocco, M.A.,Li, Y. (deposition date: 2020-09-29, release date: 2020-12-02, Last modification date: 2024-03-06)

Primary citation

Cash, J.N.,Kearns, S.,Li, Y.,Cianfrocco, M.A.
High-resolution cryo-EM using beam-image shift at 200 keV.
Iucrj, 7:1179-1187, 2020

PubMed Abstract: Recent advances in single-particle cryo-electron microscopy (cryo-EM) data collection utilize beam-image shift to improve throughput. Despite implementation on 300 keV cryo-EM instruments, it remains unknown how well beam-image-shift data collection affects data quality on 200 keV instruments and the extent to which aberrations can be computationally corrected. To test this, a cryo-EM data set for aldolase was collected at 200 keV using beam-image shift and analyzed. This analysis shows that the instrument beam tilt and particle motion initially limited the resolution to 4.9 Å. After particle polishing and iterative rounds of aberration correction in , a 2.8 Å resolution structure could be obtained. This analysis demonstrates that software correction of microscope aberrations can provide a significant improvement in resolution at 200 keV.

PubMed: 33209328
DOI: 10.1107/S2052252520013482

Experimental method

ELECTRON MICROSCOPY (2.8 Å)