REL RCSB RCSB RCSB 2014-10-08 2014-10-22 2014-10-22 2014-12-03 Cryo-EM reconstructions of E. coli ribosomal 30S subunit assembly intermediates Sashital DG Greeman CA Lyumkis D Potter CS Carragher B Williamson JR Ribosome assembly, 30S subunit, Assembly intermediate Sashital DG Greeman CA Lyumkis D Potter C Carragher B Williamson JR A combined quantitative mass spectrometry and electron microscopy analysis of ribosomal 30S subunit assembly in E. coli. eLife 3 2014 25313868 doi:10.7554/eLife.04491 EMD-6142 FULLOVERLAP EMD-6143 FULLOVERLAP EMD-6145 FULLOVERLAP Early (Group I) 30S ribosomal subunit assembly intermediate, class 3 Early (Group I) 30S ribosomal subunit assembly intermediate, class 3
Group I particles from early 30S assembly intermediates affinity-purified from E. coli rimP deletion strain
1 0.5 Calculation of MW of known components 30S assembly intermediate GO:0005840 false Escherichia coli BW25113 0.5 ribosome-prokaryote: SSU 30S, PSR16s singleParticle particle 0.03 7.5
20 mM Tris, pH 7.5, 100 mM NH4Cl, 10 mM MgCl2, 0.5 mM EDTA, 6 mM 2-mercaptoethanol
C-flat grids (Protochips) with 2 micron diameter holes coated with a thin (2 nm) layer of continuous carbon support, plasma-cleaned for 5s
 ETHANE 85 120 GATAN CRYOPLUNGE 3 Sample was applied to grid for 1 minute, then blotted for 3 seconds before plunging. FEI TECNAI F20 FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 200 2 2.5 5.0 29000.0 29000.0 SIDE ENTRY, EUCENTRIC 80 Objective lens astigmatism was corrected using a live image of the power spectrum. 2013-08-29 GATAN K2 (4k x 4k) 1253 33.67
The dose was fractionated over 30 frames (200 ms each) and image frames were aligned using a program generously provided by Yifan Cheng and Xueming Li.
Image frame sets (30 frames, 200 ms each) were aligned prior to image processing. Particles were selected using DoG picker in Appion. Group I particles were identified following extensive alignment and classification.
Each micrograph
 OTHER 27.0 OTHER Xmipp, Frealign
Group I particles were sorted into 4 groups and reconstructed using Frealign 9.
2722 emd_6144.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 72 72 72 0 0 0 72 72 72 348.48 348.48 348.48 90.0 90.0 90.0 X Y Z -0.7106663 2.60151291 -0.00764553 0.22658597 4.84 4.84 4.84 1.0 AUTHOR Reconstruction of Group I intermediate from cryo-EM analysis of affinity-purified 30S assembly intermediates (Frealign model 3 of 4)
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