REL RCSB RCSB RCSB 2015-11-30 2016-01-13 2016-02-17 2016-03-02 Cryo-EM structure of the magnesium channel CorA in the magnesium-free asymmetric open state I Matthies D Dalmas O Borgnia MJ Dominik PK Merk A Rao P Reddy BG Islam S Bartesaghi A Perozo E Subramaniam S membrane protein, ion channel, magnesium channel, pentameric complex, symmetry vs. asymmetry, conformational change, direct electron detector, K2, single-particle cryo-electron microscopy Matthies D Dalmas O Borgnia MJ Dominik PK Merk A Rao P Reddy BG Islam S Bartesaghi A Perozo E Subramaniam S Cryo-EM Structures of the Magnesium Channel CorA Reveal Symmetry Break Upon Gating CELL(CAMBRIDGE,MASS.) 164 747 756 2016 26871634 doi:10.1016/j.cell.2015.12.055 3jcg FULLOVERLAP CorA from Thermotoga maritima in the absence of magnesium, state I CorA from Thermotoga maritima in the absence of magnesium, state I
Detergent-solubilized, purified protein
One homopentamer of CorA 1 0.2 CorA Thermotoga maritima Inner Membrane 0.2 5 Pentamer true Escherichia coli BL21(DE3) PlysS Cora-Pet15b Q9WZ31 IPR004488 singleParticle particle 3.7 7.3
50 mM HEPES, 150 mM NaCl, 1 mM EDTA, 0.5 mM DDM
300 mesh Cu R1.2/1.3 holey carbon grids from Quantifoil, plasma-cleaned
 ETHANE 86 90 LEICA EM GP Grids were blotted at 4 degrees Celsius for 7 seconds after a 10-second pre-blotting period, then plunge-frozen in liquid ethane. FEI TITAN KRIOS FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 2.7 0.89 2.7 105000.0 105000.0 FEI TITAN KRIOS AUTOGRID HOLDER 79.6 79.8 79.7 Objective lens astigmatism was corrected at 105,000 times magnification. 5 Gatan, Inc. 0.0 20.0
Parallel beam illumination
2014-10-15 GATAN K2 QUANTUM (4k x 4k) 2498 40
Every image is the average of 38 frames recorded by the direct electron detector. The total exposure time was 15.2 seconds, and intermediate frames were recorded every 0.4 seconds.
 Liquid nitrogen-cooled
Particles were selected using an automatic selection program. 3D classification, 3D refinement, and post-processing were done using RELION 1.3.
CTF parameters obtained from whole micrograph
 7.06 OTHER RELION
Final maps were calculated from two merged datasets.
26271 emd_6552.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 256 256 256 0 0 0 256 256 256 346.112 346.112 346.112 90.0 90.0 90.0 X Y Z -0.02053478 0.0724296 0.00042226 0.00328655 1.352 1.352 1.352 0.03 AUTHOR Reconstruction of Thermotoga maritima CorA in the absence of magnesium resulting in at least two conformations; here state I
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