REL RCSB RCSB RCSB 2010-09-22 2010-12-09 2011-07-07 2014-07-23 Yuan S Yu X Topf M Ludtke SJ Akey CW Drosophila apoptosome, apoptosis, programmed cell death Yuan S Yu X Topf M Dorstyn L Kumar S Ludtke SJ Akey CW STRUCTURE 19 128 140 2011 21220123 doi:10.1016/j.str.2010.10.009 4v4l FULLOVERLAP Drosophila apoptosome (double ring) Drosophila apoptosome (double ring)

Sample assembled in low salt buffer (20 mM HEPES pH 7.5, 10 mM KCl, 1.5 mM MgCl2, 1 mM EDTA, 1 mM EGTA, 1 mM DTT) at about 0.5 mg per ml with dATP

hexadecamer of Dark molecules 1 2.5 Drosophila Apaf-1 like protein Drosophila melanogaster fruit fly cytosol 0.16 16 hexadecamer true sf21 insect cells pFastBac singleParticle particle 2 7.5

20mM HEPES, 10mM KCl, 1.5mM MgCl2, 1mM EDTA, 1mM EGTA, 1mM DTT

thin carbon film covered holey grid

ETHANE 100 77 OTHER

Vitrification instrument: FEI Vitrobot. blotting at room temperature with sample at room temperature

Blot for 2-2.5s before plunging FEI TECNAI F20 FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 160 2.0 1.5 3.0 50000.0 50000.0 GATAN LIQUID NITROGEN 93 100 93 objective lens astigmatism was corrected at 200,000 times magnification

actual magnification at the ccd 87000, camera pixel size 15um, 1.72 angstrom per pixel, data collected semi-automatically with EMTools

2009-09-15 GENERIC TVIPS (4k x 4k) 1100 20

the frames were 4096 x 4096 tiffs collected with the TVIPS CCD

Side entry liquid nitrogen-cooled cryo specimen holder

actual class number 1353

each image

OTHER 6.9 FSC 0.5 CUT-OFF EMAN2

Projection matching was done with Fourier ring correlation, model-based masking and SSNR weighting over an 80-6 angstrom resolution range. The final refinement steps used an angular step of 2.5 degrees and each of the 48,000 particles was matched to the best two projection classes (1353). In total, 45,000 particles were used in the final reconstruction and the 3D map was amplitude corrected then Gaussian low-pass filtered with a Fourier half-width of 0.12.

48271 1000