Abstract

Cytochrome c552 from a thermophilic hydrogen-oxidizing bacterium, Hydrogenobacter thermophilus, exhibits remarkable thermostability. The oxidized cytochrome c552 has been crystallized in an ethanol/water mixture by means of the vapor diffusion method. The crystals belong to the orthorhombic system, space group P2(1)2(1)2, with unit cell dimensions of a = 93.4 A, b = 52.9 A, and c = 32.4 A. Most probably the asymmetric unit contains two molecules of cytochrome c552. The crystals diffract X-rays to better than 2.5 A resolution and are stable to X-ray irradiation.

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