PR5 — Nicotiana attenuata

Summary

A4A49_06479 (NaPR5) on chromosome 6 of coyote tobacco encodes a thaumatin-like protein with glucan endo-1,3-beta-D-glucosidase activity and is associated with IgE and mRNA binding. The gene is associated with systemic acquired resistance, responses to viruses, bacteria, UV-B, ethylene, cadmium, and arachidonate, as well as programmed cell death, cell wall biogenesis, ethylene and anthocyanin anabolism, and posttranscriptional gene regulation. NaPR5 localizes to the apoplast, cell wall, vacuole, plasmodesmata, secretory vesicles, and mitochondria. Associations include osmotic stress response, proline accumulation, and defense against pathogens, insects, and fungi, alongside tolerance to salt, drought, and UV-B stress. Studies of related genes in other species connect the family to immune responses, cell wall integrity, and resistance to nematodes and late blight.