In previous proteomics studies, we demonstrated that H2O2 stimulates oxidative post-translational modifications on class II Poly(A) binding proteins (PABPs). We hypothesized that these affect RNA binding activity. To address redox regulation of these abiotic stress-related PABPs, we generated transgenic plants in which wildtype and Cys-mutated PABPs are expressed and which will be subjected to detailed phenotypic and biochemical analyses.