REL PDBe PDBe PDBe 2013-03-01 2013-03-13 2013-03-13 2014-03-26 Visualizing GroEL/ES in the Act of Encapsulating a Non-Native Substrate Protein Chen D-H Madan D Weaver J Lin Z Schroder GF Chiu W Rye HS protein folding, chaperonin, GroEL, GroEL-GroES, cryo-EM, heterogeneity Chen D-H Madan D Weaver J Lin Z Schroder GF Chiu W Rye HS Visualizing GroEL/ES in the act of encapsulating a folding protein. CELL(CAMBRIDGE,MASS.) 153 1354 1365 2013 23746846 doi:10.1016/j.cell.2013.04.052 3zpz FULLOVERLAP GroEL variant EL43Py capped by GroES with the assistance of nucleotide ATP GroEL variant EL43Py capped by GroES with the assistance of nucleotide ATP
The molecule is bullet-shaped
One heptamer of GroES and seven nucleotides of ATP binds to one tetradecamer of GroEL variant EL43Py 3 0.87 0.87 GroEL molecular weight 800kDa plus GroES molecular weight 70kDa GroELcys0-D398A-S43C-pyrene Escherichia coli K-12 Cytoplasm 0.8 0.8
A GroEL variant in which the endogenous Cys residues (138, 458, 519) have been changed to Ala (GroELcys0) was modified to contain two additional mutations: D398A and S43C. The D398A mutation prevents ATP hydrolysis by GroEL, while the S43C mutation, located at the tip of stem loop at the bottom of the GroEL cavity, permits the covalent attachment of N-1-pyrene maleimide to this position.
14 Tetradecamer true Escherichia coli BL21 pACYC P0A6F5 GroES Escherichia coli K-12 Cytoplasm 0.070 0.070 7 Heptamer true Escherichia coli BL21 pACYC P0A6F9 Adenosine triphosphate synthetic construct 7 false singleParticle particle 6.4 7.6
50 mM Hepes, 5 mM KOAc, 10 mM Mg(OAc)2, 2 mM DTT
400 mesh R1.2/1.3 Quantifoil grid glow-discharged 10 sec before freezing
 ETHANE 95 98 FEI VITROBOT MARK III Blot for 1 second before plunging JEOL 3000SFF FLOOD BEAM OTHER FIELD EMISSION GUN 300 1.6 1.2 3.5 60000.0 61060.0 JEOL 10 12 11 Objective lens astigmatism was corrected at 400,000 times magnification 2007-03-07 KODAK SO-163 FILM NIKON SUPER COOLSCAN 9000 6.35 390 36
The scanned images were averaged twice.
8. Helium cooled top-entry cartridge
Particle selection was performed semi-automatically using the EMAN1 program, boxer. The contrast transfer function fitting was performed automatically using the program fitctf.py and then fine-tuned manually using the EMAN1 program ctfit. The methodology of EMAN1 multiple-model refinement (EMAN1 program multirefine) for compositionally and conformationally heterogeneous complex analysis was used to sort out the relatively homogeneous bullet-shaped particle images of greatest interest.
Each micrograph
 C7 OTHER 8.9 OTHER EMAN1 8372
EMAN1
 257 emd_2325.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 180 180 180 -90 -90 -90 180 180 180 374.4 374.4 374.4 90.0 90.0 90.0 X Y Z -1.13611758 3.1620748 0.03553469 0.23130623 2.08 2.08 2.08 1.3 AUTHOR C7-symmetry imposed 3D reconstruction of the bullet-shaped subpopulation sorted from the heterogeneous sample of EL43Py reacted with GroES and nucleotide ATP
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 1AON A B C D E F G H I J K L M N O P Q R S T U FLEXIBLE FIT DireX cross-correlation coefficient REAL