Has a glutathione-disulfide oxidoreductase activity in the presence of NADPH and glutathione reductase. Reduces low molecular weight disulfides and proteins. Possesses thioltransferase, dehydroascorbate reductase and GSH-dependent peroxidase activities in vitro. The highest catalytic efficiency is observed with cumene hydroperoxide as substrate. Expressed in aleurone layer. The N-terminus is blocked. The mutagenesis of Cys-26 into a serine residue does not affect thioltransferase and GSH-dependent peroxidase activities. Belongs to the glutaredoxin family. CPYC subfamily.