Ascorbate oxidase backbone

Fig. 10. (a) Copper site in domain 1 of ascorbate oxidase, (b) Ribbon drawing of tbe ascorbate oxidase domain 1 backbone, (c and d) Schematic of ascorbate oxidase domain 1 topology. 

Fig. 11. (a) Ribbon drawing of the ascorbate oxidase domain 2 backbone, (b and c) Schematic of ascorbate oxidase domain 2 topology. 

Fig. 28.11 (a) A ribbon representation of one unit of ascorbate oxidase isolated from courgettes (zucchini, Cucurbita pepo medullosd). The positions of the Type 1 (on the left), Type 2 and Type 3 Cu atoms are shown, (b) Details of the tricopper unit. Each Type 3 Cu centre is bound to the protein backbone by three His residues, and the Type 2 Cu is coordinated by two His residues, (c) The Type 1 Cu centre is coordinated by a Cys, a Met and two His residues. Hydrogen atoms are omitted colour code Cu, brown S, yellow C, grey N, blue O, red. 

---