PR5 — Nicotiana attenuata

Summary

A4A49_40820 (PR5, NaPR5) in Nicotiana attenuata encodes a thaumatin-like protein with glucan endo-1,3-beta-D-glucosidase activity, annotated to IgE binding, mRNA binding, and protein binding. It is associated with posttranscriptional regulation of gene expression, cell wall biogenesis, systemic acquired resistance, programmed cell death, and responses to bacteria, viruses, UV-B, ethylene, and cadmium. The protein localizes to the apoplast, plant-type cell wall, secretory vesicle, vacuole, plasmodesma, and mitochondria. Associations with leaf curling, osmotic stress response, proline accumulation, and tolerance to drought, salt, and fungal pathogens (e.g., Verticillium dahliae) have been reported. Studies of related genes in other species link the family to pathogen resistance, induced systemic resistance, herbivore defense, and seed germination under salt stress.