PDI — Triticum aestivum

Summary

TRAESCS4A02G214200, designated TaPDI (also known as TaPDIL1-2, TaPDI5-4A, TaPDI6-4A, TaESP2-4A), encodes a protein disulfide isomerase on wheat chromosome 4A. The product contains thioredoxin domains and a thioredoxin-like superfamily domain, and has been annotated with disulphide bond formation, cysteine-type peptidase activity, and ATP binding. In bread wheat, TaPDI is associated with thousand-kernel weight, pre-harvest sprouting, protein storage, ER stress response, starch breakdown, and regulation of programmed cell death. It is linked to grain weight, grain yield, protein content, starch content, plant height, flowering time, shoot axis branching, root morphology, and drought tolerance. The protein localises to the ER lumen, protein storage vacuole, thylakoid, and secretory vesicle. Studies of related genes in other species link the family to photoinhibition resistance and D1 protein synthesis.