PR5 — Cucumis sativus

Summary

CsPR5 (CSA_2G264600) in cucumber (Cucumis sativus) on chromosome 2 encodes a thaumatin-like protein 1b, belonging to the osmotin/thaumatin-like superfamily with a thaumatin conserved domain. The product exhibits glucan endo-1,3-beta-D-glucosidase activity and IgE binding. CsPR5 is associated with systemic acquired resistance, defense response to fungi, and defense response more broadly, as well as response to abscisic acid and killing of cells of other organisms. It localizes to the apoplast and extracellular space. Studies of related genes in other species link the thaumatin-like protein family to glucan endo-1,3-beta-glucosidase activity (EC 3.2.1.39) and include proteins like osmotin-like protein and PR-5b.