SUN Cuifeng, LIU Fenju, CHEN Jian, et al. Effect of the lexA gene of deinococcus radiodurans on the resistance of escherichia coli to γ−rays and MMC[J]. Journal of Radiation Research and Radiation Processing, 2003,21(4):276-279.
SUN Cuifeng, LIU Fenju, CHEN Jian, et al. Effect of the lexA gene of deinococcus radiodurans on the resistance of escherichia coli to γ−rays and MMC[J]. Journal of Radiation Research and Radiation Processing, 2003,21(4):276-279.DOI:
The work is to study the effect of ,lexA, gene of ,Deinococcus radiodurans, expressed in ,Escherichia coli, on its resistance to γ−rays and MMC. Recombinant plasmid pZA172 was constructed by cloning the ,lexA, gene of ,Deinococcus radiodurans, into the vector plasmid PUC 19 in the downstream of ,lacZ, promoter. Transfected ,Escherichia coli, strain JM109(pZA172) was obtained through transfection of JM109strain with pZA172 by electroporation. Expression of the ,lexA, protein in the IPTG−INDUCED JM109 (Pza172) was checked by SDS−PAGE, and survival curve of the strain was measured using colony formation assay after treatment with different doses of radiation and different concentrations of MMC. After IPTG induction, the ,lexA, protein was significantly expressed in the strain JM109 (pZA172), and the survival rate of the strain was higher than that of the control. The expression of ,Deinococcus radiodurans lexA, gene in ,Escherichia coli, resulted in the increase of sensitivity of the latter to γ−rays and MMC. Mechanism of the effect remains to be further investigated.