Figure 1 - full size

 

Figure 1.
FIGURE 1. The TREX1 dimer in complex with ssDNA. The TREX1 exonuclease dimerizes about a 2-fold axis perpendicular to the -strands (monomers shown in blue and green). This interaction creates an extended anti-parallel -sheet through the core of the dimer and places the two active sites on opposite outer edges. The complex contains ssDNA (shown as sticks) and Ca^2+ (shown as red spheres) bound in both of the active sites.

The above figure is reprinted by permission from the ASBMB: J Biol Chem (2007, 282, 10537-10543) copyright 2007.