Figure 6 - full size

 

Figure 6.
Figure 6. Stereo view of the interface around the molecular 3-fold axis. There is a water cluster in the interior and one calcium ion held by three aspartate residues at the external end of the interface (top). Because the respective residues are conserved, these features occur most likely also in the E. coli homologue.

The above figure is reprinted by permission from Elsevier: J Mol Biol (1997, 266, 761-775) copyright 1997.