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Figure 1.
Overall structure of M. sexta PPO. (A) The heterodimeric PPO
is formed in a back-to-back mode. PPO1 and PPO2 are shown in
green and yellow, respectively. (B) Domains of PPO2 are colored
as follows: pro-region, purple; domain I, blue; domain II,
yellow; domain III, green. The di-copper atoms are located in
domain II and are shown as red spheres. The proteolytic site R51
residue is shown in the stick. The amino-terminus and
carboxyl-terminus of PPO2 are indicated as N and C, respectively.
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