Sequence alignment of PAB1135. (A) Alignment of PAB1135 from Pyrococcus abyssi with Af2318 from Archaeoglobus fulgidus and SSO0741 from Sulfolobus solfataricus in CLUSTALW. (B) Cartoon of the Pa1135 model from MODELLER showing the twisted five-stranded β-sheet with its concave face on one side and α-helices on the other. The side chains of the basic residues on the surface of the β-sheet are shown. (C) Cartoon of the model of PAB1135 interacting with RNA.