ZENis somewhat structurally related to the above-mentioned aromatic pollutants (Fig.1). However, not many works have been reported on the degradation of ZEN by these peroxidases (Peter 2000;Ogawaa et al.2004;Zinedinea et al.2007).To further conform whether Prx identified on the previous findings (Yu et al.2011)was involved to ZEN degradation, a gene of Prx from Acinetobacter sp. SM04 was cloned and expressed in E.coli BL2 (DE3).Meanwhile, the activity of recombinant Prx to degrade ZEN was also assessed.