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  • Title: Crystallization and preliminary X-ray crystallographic studies of bovine heart mitochondrial cytochrome bc1 complex.
    Author: Kubota T, Kawamoto M, Fukuyama K, Shinzawa-Itoh K, Yoshikawa S, Matsubara H.
    Journal: J Mol Biol; 1991 Sep 20; 221(2):379-82. PubMed ID: 1656052.
    Abstract:
    Cytochrome bc1 complex (ubiquinol:ferricytochrome c oxidoreductase, EC. 1.10.2.2) from bovine heart mitochondria was crystallized by a batchwise method from protein solution containing sucrose monolaurate using polyethylene glycol-4000 as a precipitant. The red parallelepiped crystals grew to a size of approximately 1 mm x 1 mm x 1 mm. The crystalline protein showed enzymic activity catalyzing electron transfer from ubiquinol-2 to cytochrome c. The subunit composition and absorption spectrum of the crystalline enzyme were identical to those reported previously for the enzyme in solution. The crystal diffracted X-rays to 7.5 A resolution. The diffraction pattern indicated a monoclinic form, space group P2(1), and unit-cell constants of a = 196 A, b = 179 A, c = 253 A and beta = 97 degrees. Most probably four functional units are present in an asymmetric unit.
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