Expression and Purification of Recombinant Superoxide Dismutase (PaSOD) from Psychromonas arctica in Escherichia coli

Bulletin of the Korean chemical society

Kyunghee Lee¹  Hana Im¹  Jumee Na¹ 

关键词: Psychrophilic;    Superoxide dismutase;    Cold-adaptation;    Chaperone;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

The psychrophilic bacteria Psychromonas arctica survives at subzero temperatures by having adapted several protective mechanisms against freezing and oxidative stresses. Many reactive oxygen species are likely generated in P. arctica as a result of reduced metabolic turnover rates. A previous study identified the pasod gene for superoxide dismutase from P. arctica using a series of PCR amplifications. Here, upon cloning into a His-tag fused plasmid, the sod gene from P. arctica (pasod) was successfully expressed by IPTG induction. His-tagged PaSOD was subsequently purified by Ni2+-NTA affinity chromatography. The purified PaSOD exhibited a higher SOD activity than that of Escherichia coli (EcSOD) at all temperatures. The difference in activity between PaSOD and EcSOD becomes even more significant at 4 oC, indicating that PaSOD plays a functional role in the cold adaptation of P. arctica in the Arctic.

【 授权许可】

Unknown