Plastocyanins oxidized poplar

Guss JM, Freeman HC (1983) Structure of oxidized poplar plastocyanin at 1.6 A resolution. J Mol Biol 169 521-563... 

The mononuclear copper site is located in domain 3 and has the four canonical type-1 copper ligands (His, Cys, His, and Met) also found in plastocyanin and azurin. It is coordinated to the NDl atoms of His 445 and 512, the SG atom of the Cys 507, and the SD atom of Met 517 in a distorted trigonal pyramidal geometry. The SD atom is at the long apex (see Fig. 4). Bond lengths of the type-1 copper for both subunits are displayed in Table III. They are compared with oxidized poplar plastocyanin (95) and azurin from Pseudomonas aeruginosa (96). Figure 5 shows an overlay of the type-1 copper site in azurin, plastocyanin, and ascorbate oxidase. 

Fig. 13. Tertiary structure of plastocyanin from poplar. The two, four-stranded planes oppose each other and enclose the copper ion. From Ryden and Hunt 1993 [71] with permission. The coordinates for oxidized poplar pastocyanin originally determined by [22] were obtained from the Brookhaven Data Bank. The program MOLSCRIPT [79] was used for depiction...

Figure 6 Copper sites in (a) poplar plastocyanin, (b) A. den. azurin, (c) tomato plantacyanin, and (d) cucumber stellacyanin. Distances are for the oxidized form, with those for the reduced form in parentheses...

Oxidation state Poplar plastocyanin P. vulgaris plastocyanin S. oleracea plastocyanin P. aer. azurin ... 

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