Title |
Improved tolerance of Escherichia coli to oxidative stress by expressing putative response regulator homologs from Antarctic bacteria |
Author |
Seo-jeong Park1, Sangyong Lim2, and Jong-il Choi1* |
Address |
1Department of Biotechnology and Bioengineering, Interdisciplinary Program for Bioenergy and Biomaterials, Chonnam National University, Gwangju 61186, Republic of Korea, 2Biotechnology Research Division, Korea Atomic Energy Research Institute, Jeongeup 56212, Republic of Korea |
Bibliography |
Journal of Microbiology, 58(2),131-141, 2020,
|
DOI |
10.1007/s12275-020-9290-5
|
Key Words |
response regulator homologs, oxidative stress, tolerance,
resistance, Antarctic bacterium |
Abstract |
Response regulator (RR) is known a protein that mediates
cell’s response to environmental changes. The effect of RR
from extremophiles was still under investigation. In this study,
response regulator homologs were mined from NGS data
of Antarctic bacteria and overexpressed in Escherichia coli.
Sixteen amino acid sequences were annotated corresponding
to response regulators related to the two-component regulatory
systems; of these, 3 amino acid sequences (DRH632,
DRH1601 and DRH577) with high homology were selected.
These genes were cloned in pRadGro and expressed in E. coli.
The transformant strains were subjected to various abiotic
stresses including oxidative, osmotic, thermal stress, and acidic
stress. There was found that the robustness of E. coli to
abiotic stress was increased in the presence of these response
regulator homologs. Especially, recombinant E. coli overexpressing
drh632 had the highest survival rate in oxidative,
hypothermic, osmotic, and acidic conditions. Recombinant E.
coli overexpressing drh1601 showed the highest tolerance level
to osmotic stress. These results will be applicable for development
of recombinant strains with high tolerance to abiotic
stress. |