2026-10-14 REL PDBj INITIAL_RELEASE REPOSITORY PDBj PDBj 2026-09-12 2026-10-14 2026-10-14 2026-10-14 Ministry of Science and Higher Education of the Russian Federation AAAA-A19-119031390114-5 Russian Federation Cryo-EM structure of monomeric bovine heart cytochrome c oxidase in amphipol A8-35 Chesnokov YM Nesterov SV Cytochrome c oxidase, Amphipol A8-35, Monomer, Cryo-EM, OXIDOREDUCTASE Azarkina NV Orlov NV Muntyan MS Chesnokov YM Nesterov SV Oleynikov IP Vygodina TV Reversible Dimerization of Cytochrome Oxidase in Detergent Solution as Detected by Dynamic Light Scattering Int J Mol Sci CH 27 8744 8744 2026 doi:10.3390/ijms27198744 1422-0067 EMDB EMD-83586 associated EM volume Cytochrome c oxidase Cytochrome c oxidase 0
Monomeric bovine heart cytochrome c oxidase (complex IV, 13 subunits) solubilized in amphipol A8-35 (AmM preparation).
Bos taurus Heart Mitochondrion Inner mitochondrial membrane 0.2045 singleParticle particle 1 7.5 50.0 C8H18N2O4S HEPES
50 mM HEPES/NaOH, pH 7.5
 Quantifoil R1.2/1.3 COPPER 300 CARBON HOLEY ARRAY GLOW DISCHARGE AIR 0.026000000000000002
Glow-discharged for 20 s at 20 mA using a PELCO easiGlow system.
 ETHANE 100 277 FEI VITROBOT MARK IV
Monomeric bovine cytochrome c oxidase in complex with amphipol A8-35, purified from bovine heart mitochondria.
 TFS KRIOS FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 100.0 0.01 0.7000000000000001 0.7000000000000001 1.5 1.5 81000.0 57208.0 FEI TITAN KRIOS AUTOGRID HOLDER NITROGEN 77.0 80.0 Cs image corrector (CEOS GmbH) GIF Bioquantum 20
Cs corrected, 3x3 holes (2 exposures per hole) image-shift data acquisition strategy
GATAN K3 BIOQUANTUM (6k x 4k) 5760 4092 1 1011 3.5 52.0 1 20739 Warp 1.9 CTF estimation cryoSPARC 4.6 CTF refinement PHASE FLIPPING AND AMPLITUDE CORRECTION Ab initio reconstruction in cryoSPARC
Ab initio reconstruction with two classes at a maximum resolution of 6 A using 20,739 particles
 1 C1 FOURIER SPACE 3.19 FSC 0.143 CUT-OFF cryoSPARC 4.6 7428 OTHER cryoSPARC 4.6 Ab initio reconstruction
Stochastic gradient descent during ab initio reconstruction
 MAXIMUM LIKELIHOOD cryoSPARC 4.6 Non-uniform refinement
Non-uniform refinement, CTF refinement, second round of non-uniform refinement
 2 10370.0 cryoSPARC 4.6 Ab initio reconstruction (2 classes)
Multi-class ab initio reconstruction; the major class (7,428 particles) consistent with the monomeric CcO structure was selected, the remaining particles were discarded.
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