Chemical Research in Chinese Universities ›› 2014, Vol. 30 ›› Issue (6): 947-952.doi: 10.1007/s40242-014-4239-z

• Articles • Previous Articles     Next Articles

Gene Manipulation Based Selenium-containing Peptide Exhibiting Synergism of SOD and GPx

SHEN Na1, YAN Fei1, LÜ Shaowu1, YANG Wenkui1, LUO Guimin1, YAN Ganglin1, MU Ying1,2   

  1. 1. Key Laboratory for Molecular Enzymology and Engineering, Ministry of Education, Jilin University, Changchun 130021, P. R. China;
    2. Research Center for Analytical Instrumentation, Institute of Cyber-systems and Control, State Key Laboratory of Industrial Control Technology, Zhejiang University, Hangzhou 310058, P. R. China
  • Received:2014-06-27 Revised:2014-09-04 Online:2014-12-01 Published:2014-09-15
  • Contact: YAN Ganglin, MU Ying E-mail:ygl@jlu.edu.cn;muying@zju.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.31170740, 31270907) and the Natural Science Foundation of Jilin Province, China(No.20130101159JC).

Abstract:

In this paper, we constructed a novel bifunctional superoxide dismutase(SOD)/glutathione peroxi- dase(GPx) mimic, a selenium-, copper-containing 35-mer peptide conjugate(Se-Cu-35P) in which a three-amino acid linker(Gly-Asn-Gly) connects the C-terminus of 17-mer polypeptide SOD mimic with the N-terminus of 15-mer polypeptide GPx mimic. The SOD and GPx activities of Se-Cu-35P are two orders of magnitude lower than those of natural SOD and GPx, respectively. It provides a GPx activity 56-fold higher than Ebselen(a well-known GPx mimic). The glutathione(GSH) binding constant is 5.6×102 L·mol-1. Se-Cu-35P synergistically resists against the inactivation by H2O2 and protects the mitochondria from oxidative damage in a dose dependent manner. These results highlight the challenge of generating an efficient SOD/GPx synergism mimic. It could facilitate the studies of the cooperation of GPx and SOD and could be a potential therapeutic agent for the treatment of ROS-mediated diseases.

Key words: Reactive oxygen species, Superoxide dismutase, Glutathione peroxidase, Bifunctional enzyme