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Figure 4
Stereoviews of the crystal packing of EcA (upper panel) and ErA (lower panel). The unit cells of both structures are viewed along the same direction. Each monomer is represented by a sphere, uniquely colored as in Fig. 1[link]. Additionally, monomers within the biological tetramers are connected. Three molecular twofold axes, corresponding to the 222 symmetry, are shown for one (white) tetramer within each assembly. For each tetramer, one of the three twofold axes (black) relates two equivalent dimers. In both structures, this dyad axis coincides with the diagonal crystallographic twofold axis. Additionally, it can be seen that the arrangements of tetramers within both lattices are different.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 57| Part 3| March 2001| Pages 369-377
doi:10.1107/S0907444900020175
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