Figure 12
Stereoview representing all C—Se—C groups in the unit cell of crystals of selenated human aldose reductase. The Cα backbones of the two protein molecules are represented in green. Se atoms are represented in yellow and the Cγ and C∊ atoms in selenomethionine side chains are represented in grey. Crystal axes (x, y, z) are also indicated. It can be seen from this representation that there is no obvious alignment of C—Se—C groups. The SeMet-168 residues (near the y axis) adopt two alternative conformations (see §3.4) which are represented as two very close C—Se—C moieties. |