Fig. 2.

Topological analysis of the plant ULP proteins. (A) Schematic representation of Arabidopsis and yeast ULP protein topology with the catalytic domain highlighted in orange. The scale bar indicates 100 amino acids. (B) Protein sequence alignment of the catalytic domain in Arabidopsis ULPs. The arrows indicate the three conserved catalytic residues. Consistency between sequences indicates the levels of conservation of each residue. Five main extensions can be discriminated within the catalytic domain (loops 1–5).