PR5 — Nicotiana attenuata

Summary

A4A49_27825, designated NaPR5 (also known as NaOSML, OSM34, and NaTLP-3) in Nicotiana attenuata, encodes a pathogenesis-related protein 5 belonging to the thaumatin/osmotin-like superfamily. The product exhibits glucan endo-1,3-beta-D-glucosidase activity and IgE binding. NaPR5 is associated with systemic acquired resistance, defence responses to fungi, programmed cell death, ethylene anabolism, response to abscisic acid, and posttranscriptional regulation of gene expression. It is linked to cell wall biogenesis, secretion, digestion, homeostasis, and signal transduction. The protein localises to the apoplast and extracellular space. NaPR5 has been connected to leaf curling. Studies of related genes in other species link the family to glucan endo-1,3-beta-glucosidase activity (EC 3.2.1.39).