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• W2147510765 abstract "We have studied the structure of beef heart mitochondrial cytochrome c oxidase dimers by image-processing of electron micrographs of the vesicle crystal form. Specimens were prepared by different procedures, which contrast different features of the crystals. Heavy-atom shadowing of freeze-dried crystals contrasts the exterior or M-side surface (mitochondrial matrix-side) and reveals a 100 Å long ellipsoidal dimer oriented with its long axis in the (−1, 1) direction of the 95 Å × 125 Å rectangular unit cell. The M-side surface structure correlates well with the intra-bilayer structure revealed by contrast matching extra-bilayer protein with glucose. Frozen suspensions of vesicle crystals fracture predominantly along hydrophilic surfaces revealing the interior C-side (mitochondrial cytoplasm-facing surface) of vesicle crystals. The C-side surface revealed in shadowed replicas of fracture surfaces shows the ends of the dimers furthest from the bilayer surface; they consist of two structural domains separated by 70 to 80 Å. We present a new interpretation of the structure of the cytochrome oxidase dimer based on these data and on the y-shaped monomer structure described by Fuller et al. (1979). A cytochrome oxidase dimer is formed from two y-shaped monomers joined along one set of identical M-domain arms with the other arms approximately 70 Å apart along a unit cell diagonal in the (−1, 1) direction. The arms of the monomers lie within and perpendicular to the phospholipid bilayer, and they protrude approximately 25 Å beyond the bilayer surface on the M-side. The y tails represent the C-side domains, which are closely apposed across the dimer 2-fold axis near the C-side bilayer surface. Further away from the bilayer surface, C-side domains split away from one another forming a large cleft." @default.
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• W2147510765 date "1982-11-01" @default.
• W2147510765 modified "2023-09-23" @default.
• W2147510765 title "Structure of the cytochrome c oxidase dimer electron microscopy of two-dimensional crystals" @default.
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• W2147510765 doi "https://doi.org/10.1016/0022-2836(82)90164-4" @default.
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