Type II RIP family is widely represented in plants of different taxonomic origins such as ricin, viscumin, abrin, volkesin, etc.
1993) and with most B chains of the type II RIPs, such as ricin and viscumin (Van Damme et al.
A detailed comparison between the carbohydrate-binding site of ricin, viscumin and volkensin and the sequences obtained here indicate that the peptide identified as number 5 in Table 2 contained amino acid D234 which is part of the carbohydrate-binding site.
Steiner's day have confirmed that mistletoe extract contains several biologically active compounds, including the lectin viscumin
, which is capable of inhibiting intracellular protein synthesis, and viscotoxin, which causes cellular necrosis.