Figure 2.

Crystal Structures of Prokaryotic VRR-Nuc Domain Proteins

(A) Structures of stNUC, saNUC, and psNUC dimers. α helices in red, 3₁₀ helices pink, and β sheets blue. In each case, the dimeric partner is shown in light pink. Adjacent are electrostatic representations of the active site surface with magnesium atoms as gray spheres if present.

(B) Topology diagrams demonstrating similarity between the structures of stNUC and Hjc. Core secondary structural elements are in red and active site residues highlighted.

(C) Active site of stNUC (left) and psNUC (right).