摘要
Deinococcus radiodurans possesses extreme resistance to ionizing radiation,and has been engineered for the remediation of toxic components in radioactive environments.We have previously shown that PprI(also named IrrE)and DrRRA are essential for the DNA protection and repair pathways that respond to ionizing radiation stress in this species.Here,we investigated the combined roles of PprI and DrRRA in resistance to gamma radiation(800 Gy).The double mutant,△drRRA△pprI,was more sensitive to gamma rays than either△drRRA or△pprI single mutants,and exhibited an elevated level of intracellular protein carbonylation,an extended delay in genome reconstitution and reduced transcriptional levels of certain DNA protection and repair proteins,such as kat,sod,recA and pprA.Interestingly,the induction of DrRRA by ionizing radiation was partially inhibited by the deletion of pprI. Taken together,these results suggest that DrRRA and PprI might have collaborative roles in the response of D.radiodurans to extreme ionizing radiation.
Deinococcus radiodurans possesses extreme resistance to ionizing radiation, and has been engineered for the remediation of toxic components in radioactive environments. We have previously shown that PprI （also named IrrE） and DrRRA are essential for the DNA protection and repair pathways that respond to ionizing radiation stress in this species. Here, we investigated the combined roles of PprI and DrRRA in resistance to gamma radiation （800 Gy）. The double mutant, AdrRRA Apprl, was more sensitive to gamma rays than either AdrRRA or Apprl single mutants, and exhibited an elevated level of intracellular protein carbonylation, an extended delay in genome reconstitution and reduced transcriptional levels of certain DNA protection and repair proteins, such as kat, sod, recA and pprA. Interestingly, the induction of DrRRA by ionizing radiation was partially inhibited by the deletion ofpprl Taken together, these results suggest that DrRRA and PprI might have collaborative roles in the response of D. radiodurans to extreme ionizing radiation.
基金
supported by Special Fund for Agroscientific Research in the Public Interest(201103007)
a major project for Genetically Modified Organisms Breeding(2009ZX08009-075B)
a key project from the National Natural Science Foundation of China(30330020)
the National Natural Science Foundation of China(31070080)
the Fundamental Research Funds for the Central Universities
funded by the China Postdoctoral Science Foundation(20090451464)
