2019-11-06 REL PDBe PDBe PDBe 2017-09-11 2017-12-20 2017-12-27 2019-11-06 CNRS ATIP-Avenir 2016 France FRM DEQ20140329508 France French National Research Agency ANR-10-LABX-62-IBEID France European Research Council MolStructTransfo France Negative stain electron microscopy reconstruction of a cellulose secretion (Bcs) macrocomplex from E. coli Krasteva PV Fronzes R Krasteva PV Bernal-Bayard J Travier L Martin FA Kaminski PA Karimova G Fronzes R Ghigo JM Insights into the structure and assembly of a bacterial cellulose secretion system. Nat Commun UK 8 2065 2065 2017 29234007 doi:10.1038/s41467-017-01523-2 2041-1723 EMD-3864 associated EM volume Protein macrocomplex encompassing most cytosolic and inner-membrane components of the E. coli system for cellulose secretion Protein macrocomplex encompassing most cytosolic and inner-membrane components of the E. coli system for cellulose secretion 0
Protein macrocomplex encompassing cytosolic (BcsRQEF) and inner-membrane (BcsAB) components. Isolated from purified and detergent-solubilised E. coli 1094 membranes using FLAG-tagged BcsA as bait. Stabilised by gentle glutaraldehyde cross-linking over a density gradient (GraFix).
Escherichia coli 1094 Escherichia coli 1094 2K7 BcsA-HA-FLAG Chromosome-driven expression 1.4 singleParticle particle 0.1 8.0
20 mM HEPES pH 8.0 120 mM NaCl, 10%-40% glycerol, 5 mM MgCl2 10 uM AppCp 2 uM cyclic c-di-GMP cOmplete protease inhibitors
 NEGATIVE Uranyl Acetate
5 micrometers of sample were spotted on glow-discharged carbon-coated copper grids. After 1 minutes the liquid was blotted off and the sample was stained by quick passage through 3 drops of 2% uranyl acetate. The sample was left for 20-30 seconds on the last drop of stain, after which the liquid was blotted off and the sample was allowed to air-dry
 COPPER 400 CARBON CONTINUOUS GLOW DISCHARGE AIR
7mA, 10 microns
Sample was purified from pelleted and solubilised membrane fractions of the E. coli 1094 2K7 BcsA-HA-FLAG strain using anti-FLAG affinity gel, 3xFLAG peptide elution and glycerol gradient purification coupled with gentle glutaraldehyde cross-linking (GraFix). Sample was monodisperse and subjected to thin-layer uranyl acetate staining.
 FEI TECNAI F20 FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 200 0.5 4.0 50000. OTHER NITROGEN FEI FALCON II (4k x 4k) 2 12.0 1 44056 EMAN 2.0
CTF correction was performed in EMAN2.0 (e2ctf) using the automated fitting function before and after structure factor generation
An initial 3D model was generated in EMAN2.0 using the e2initialmodel function.
 C1 16.7 FSC 0.143 CUT-OFF RELION 1.4 24769 OTHER EMAN 2.0
An initial 3D model was generated in EMAN2.0 using the e2initialmodel function. Additional initial models were generated by random conical tilt reconstruction in EMAN using a separate dataset collected in tilt-pairs.
 NOT APPLICABLE 200 RELION 1.4
A total of 44056 particles were subjected to two rounds of 2D classification in RELION using 200 classes for each. After each round, low-contrast or smeared classes were rejected. A total of 24769 particles were saved for 3D classification in RELION using 3 classes. As all 3D classes showed similar features the EMAN2.0-generated initial model was refined against all 24769 particles.
 emd_3864.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 210 210 210 0 0 0 210 210 210 399.0 399.0 399.0 90.0 90.0 90.0 X Y Z -0.07754264 0.13978234 0.00051137165 0.008628474 1.9 1.9 1.9 0.0104 AUTHOR Bcs macrocomplex encompassing most inner-membrane and cytosolic components of the E. coli cellulose secretion system. Negative-stain EM