PR5 — Nicotiana attenuata

Summary

A4A49_22406 (PR5, TL1) in coyote tobacco (Nicotiana attenuata) encodes a thaumatin-like protein with glucan endo-1,3-beta-D-glucosidase activity and IgE binding capacity. This gene is associated with defense responses, including systemic acquired resistance, defense against fungi, and programmed cell death. It is linked to ethylene and abscisic acid signaling, cell wall biogenesis, secretion, and posttranscriptional regulation of gene expression. The encoded protein localizes to the apoplast and extracellular space. Associations with leaf curling have also been noted. Studies of related genes in other species link the family to glucan endo-1,3-beta-D-glucosidase activity (EC 3.2.1.39).