2018-02-14 REL RCSB RCSB RCSB 2016-07-16 2016-07-20 2016-12-07 2018-02-14 Setiaputra D Cheng DTH Hansen JM Yip CK Setiaputra DT Cheng DT Lu S Hansen JM Dalwadi U Lam CH To JL Dong MQ Yip CK EMBO Rep. UK 18 280 291 2017 27872205 doi:10.15252/embr.201642548 1469-3178 EMD-8291 associated EM volume EMD-8239 other EM volume

intact Elongator complex

Elp123 subcomplex of yeast Elongator Elp123 subcomplex of yeast Elongator 0

Endogenously purified yeast Elp123 complex

Saccharomyces cerevisiae BJ1991 0.85 singleParticle particle 7.4 40.0 C8H18N2O4S HEPES 300.0 NaCl sodium chloride 1.0 C10H16N2O8 EDTA 10.0 C3H8O3 Glycerol

The final purification buffer was used for size exclusion chromatography of the complex.

NEGATIVE Uranyl formate

Sample was applied to a glow-discharged copper grid overlaid with carbon (carbon evaporator and amyl acetate) and stained with uranyl formate.

Ted Pella Gilder Grids COPPER 400 CARBON CONTINUOUS GLOW DISCHARGE AIR 0.039 FEI TECNAI SPIRIT FLOOD BEAM BRIGHT FIELD LAB6 120 49000. SIDE ENTRY, EUCENTRIC FEI EAGLE (4k x 4k) 4096 4096 1 106 1.0 25.0 1 28121

200 particles were manually picked to generate 5 class averages. These were used as templates for autopicking using the RELION software.

CTFFIND 3 CTFFIND3, launched from the SPIDER interface, was used to determine CTF parameters. SPIDER 22.10 SPIDER was used to generate and apply the phase flip correction images to the raw micrographs.

CTF parameters were calculated on entire micrographs prior to any data processing using CTFFIND within SPIDER. Phase-flip correction was done in SPIDER.

81 65 1 BACK PROJECTION 24.1 FSC 0.143 CUT-OFF RELION 1.3 Output from RELION auto-refine was masked using the post-processing function to generate the final reconstruction.

The final model from RELION's auto-refine was further processed using the post-processing function in RELION to calculate the final masked map, with no map sharpening applied.

16362 PROJECTION MATCHING 7.5 RELION 1.3 Initial angular assignment was done using the 3D Classification function to generate a suitable model and particle set for refinement.

3D Classification step in RELION

PROJECTION MATCHING RELION 1.3 Final refinement was done using the 3D auto-refine function.

3D auto-refine step in RELION, which automatically increments the angular sampling

4 4091. RELION 1.3 The 3D classification function in RELION was used to characterize heterogeneity in 3D.

2D classification was used to get rid of bad particles, and showed a high degree of preferred orientation. 3D classification was used to clean up the dataset. Most of the classes were similar and were therefore merged.