Volume 24 Issue 1
Feb.  2011
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CHEN Xiang, LUO Heng, DUAN LiXia, XU QingHe, ZHANG Yong, XU HouQiang. Effects of Mercury on the Structure and Activity of BLM642-1290 Recombinant Helicase[J]. Biomedical and Environmental Sciences, 2011, 24(1): 47-55. doi: 10.3967/0895-3988.2011.01.006
Citation: CHEN Xiang, LUO Heng, DUAN LiXia, XU QingHe, ZHANG Yong, XU HouQiang. Effects of Mercury on the Structure and Activity of BLM642-1290 Recombinant Helicase[J]. Biomedical and Environmental Sciences, 2011, 24(1): 47-55. doi: 10.3967/0895-3988.2011.01.006

Effects of Mercury on the Structure and Activity of BLM642-1290 Recombinant Helicase

doi: 10.3967/0895-3988.2011.01.006
Funds:  the Natural Sciences Foundation of China (NSFC)(30660043)%the National Basic Research Program of China(2010CB534912)%the Doctoral Program of the Ministry of Education of China(200806570003)%the Governor Talents Foundation of Guizhou Province(200822)
  • Objective Bloom's syndrome is an autosomal recessive disorder characterized by genomic instability and a predisposition to many cancers. Mutations of the BLM gene (encoding a BLM helicase) may form a structure of the etiology of this disease. As a global pollutant, mercury poses a major threat to human health. The current study was conducted to elucidate the effects of Hg2+ on the structure and activity of BLM642-1290 recombinant helicase, and to further explore the molecular mechanisms of mercury toxicity to the DNA helicase.Methods The effects of Hg2+ on biological activity and structure of BLM642-1290 recombinant helicase were determined by fluorescence polarized, ultraviolet spectroscopic, and free-phosphorus assay technologies, respectively.Results The helicase activity, the DNA-binding activity, and the ATPase activity of BLM642-1290recombinant helicase were inhibited by Hg2+ treatment. The LMCT (ligand-to-metal charge transition)peaks of the helicase were enhanced with the increase of the Hg2+ level. The LMCT peaks of the same concentration of helicase gradually increased over time.Conclusions The biological activity of BLM642-1290 recombinant helicase is inhibited by Hg2+treatment. The conformation of the helicase is significantly altered by Hg2+. There exist two binding sites between Hg2+ and the helicase, which are located in the amino acid residues 1063-1066 and 940-944 of the helicase, respectively.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Effects of Mercury on the Structure and Activity of BLM642-1290 Recombinant Helicase

doi: 10.3967/0895-3988.2011.01.006
Funds:  the Natural Sciences Foundation of China (NSFC)(30660043)%the National Basic Research Program of China(2010CB534912)%the Doctoral Program of the Ministry of Education of China(200806570003)%the Governor Talents Foundation of Guizhou Province(200822)

Abstract: Objective Bloom's syndrome is an autosomal recessive disorder characterized by genomic instability and a predisposition to many cancers. Mutations of the BLM gene (encoding a BLM helicase) may form a structure of the etiology of this disease. As a global pollutant, mercury poses a major threat to human health. The current study was conducted to elucidate the effects of Hg2+ on the structure and activity of BLM642-1290 recombinant helicase, and to further explore the molecular mechanisms of mercury toxicity to the DNA helicase.Methods The effects of Hg2+ on biological activity and structure of BLM642-1290 recombinant helicase were determined by fluorescence polarized, ultraviolet spectroscopic, and free-phosphorus assay technologies, respectively.Results The helicase activity, the DNA-binding activity, and the ATPase activity of BLM642-1290recombinant helicase were inhibited by Hg2+ treatment. The LMCT (ligand-to-metal charge transition)peaks of the helicase were enhanced with the increase of the Hg2+ level. The LMCT peaks of the same concentration of helicase gradually increased over time.Conclusions The biological activity of BLM642-1290 recombinant helicase is inhibited by Hg2+treatment. The conformation of the helicase is significantly altered by Hg2+. There exist two binding sites between Hg2+ and the helicase, which are located in the amino acid residues 1063-1066 and 940-944 of the helicase, respectively.

CHEN Xiang, LUO Heng, DUAN LiXia, XU QingHe, ZHANG Yong, XU HouQiang. Effects of Mercury on the Structure and Activity of BLM642-1290 Recombinant Helicase[J]. Biomedical and Environmental Sciences, 2011, 24(1): 47-55. doi: 10.3967/0895-3988.2011.01.006
Citation: CHEN Xiang, LUO Heng, DUAN LiXia, XU QingHe, ZHANG Yong, XU HouQiang. Effects of Mercury on the Structure and Activity of BLM642-1290 Recombinant Helicase[J]. Biomedical and Environmental Sciences, 2011, 24(1): 47-55. doi: 10.3967/0895-3988.2011.01.006

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