Figure 4.

Amino acid sequence as deduced from the PrSai1 gene and amino acid sequences of the peptides generated by trypsin digestion of the soluble acid invertase (SAI) isoform purified from the subterranean shoots of Phelipanche ramosa parasitizing tomato plants. Peptides matching the putative P. ramosa acid invertase sequence are shaded, and tryptic cleavage sites are indicated by arrows. The β‐fructofuranosidase motif and a highly conserved peptide domain with a catalytic cysteine residue are underlined (Sturm, 1999).