FIG 1.

UL21N structure. The crystal structure of UL21N is shown in color based on secondary structure (A) and in rainbow coloring (B), from blue (N terminus) to red (C terminus). The StrepII tag is shown in gray. Residues unresolved in the structure are shown as dashed lines. (C) Topology diagram, colored as described for panel A. Secondary structure elements are numbered sequentially, and their amino acid boundaries are given. Helices are show as cylinders, strands as arrows, loops as solid lines, and unresolved loops as dashed lines. All structures were made using Pymol (http://www.pymol.org).