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auxin carrier, transport between cell compartments anthocyanin sequestration in the vacuoles Structure of GST proteins X-ray crystallography: Arabidopsis Phi class GST Two subunits, both with two distinct domains Active site: G-site: conserved GSH binding site (in N terminal domain - in red) H-site: binding pocket for hydrophobic cosubstrates - serine residue activates GSH for conjugation Inducibility of GSTs H2O2 and other ROS xenobiotics safeners heavy metals cold, heat drought plant hormones pathogen infections salicylic acid (SA) Peroxidase activity of GST R-OOH + 2 GSH R-OH + GS-SG + H2O Detoxification of organic hydroperoxides Tolerance against oxidative stress Hydrogen peroxide is not a substrate Glutathione peroxidase - different enzyme GST activity in cold-hardened cereals Cold-hardening: gradually decreasing temperatures for 7 weeks between 14 and 3 C increasing frost resistance Control: 17 C Strong induction But: no correlation between GST induction and frost tolerance Janda et al., Plant Science 164, 301-6 (2003) Futile gene induction

Endocrinology 151 , 41784186 (2010)