Abstract
Cytochrome c oxidase is a respiratory enzyme catalyzing the energy-conserving reduction of molecular oxygen to water-a fundamental biological process of cell respiration. The first crystal structures of the type A cytochrome c oxidases, bovine heart and Paracoccus denitrificans cytochrome c oxidases, were published in 1995 and contributed immensely to the understanding of the enzyme's mechanism of action. The senior author's research focus was directed toward understanding the structure and function of the type B cytochrome c oxidases, ba3-oxidase and type A2 caa3-oxidase, both from the extreme thermophilic bacterium Thermus thermophilus. While the ba3-oxidase structure was published in 2000 and functional characterization is well-documented in the literature, we recently successfully solved the structure of the caa3-nature made enzyme-substrate complex. This chapter is dedicated to the purification and crystallization process of caa3-cytochrome c oxidase.
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