FIG. 6.

Comparison of secondary structures of RuvC, IS621 transposase, and PIV proteins. The secondary structure of RuvC, based on the tertiary structure (PDB code 1HJR), is shown above the polypeptide sequence. α helices are indicated by ribbons, and β sheets are indicated by arrows. Other features are indicated by straight solid lines. Positions of acidic amino acids constituting the D-E-D-D motif are indicated by thin vertical lines. The secondary structures of RuvC, IS621 transposase, and PIV proteins were predicted by PSIPRED and are shown under the polypeptide sequence of each protein.