高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (12): 2366.

• 研究简报 • 上一篇    下一篇

二价金属离子对鲑鱼精DNA热稳定性的影响

邬瑞光, 尉志武, 陈琳, 周蕊   

  1. 清华大学化学系, 生命有机磷化学与化学生物学教育部重点实验室, 北京100084
  • 收稿日期:2001-11-08 出版日期:2002-12-24 发布日期:2002-12-24
  • 通讯作者: 尉志武(1962年出生),男,博士,副教授,主要从事生物物理化学研究.E-mail:yuzhw@tsinghua.edu.cn E-mail:yuzhw@tsinghua.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29973019,20133030);留学回国人员基金资助

The Effects of Divalent Metal Ions on the Thermal Stability of Salmon Sperm DNA

WU Rui-Guang, YU Zhi-Wu, CHEN Lin, ZHOU Rui   

  1. Bioorganic Phosphorous Chemistry and Chemical Biology Laboratory of Educational Ministry, Department of Chemistry, Tsinghua University, Beijing 100084, China
  • Received:2001-11-08 Online:2002-12-24 Published:2002-12-24

关键词: DNA, 热稳定性, 二价金属离子, 两阶段熔解行为, DSC

Abstract: The effects of Mg2+, Ca2+, Mn2+, Co2+ and Ni2+ on the thermal stability of Salmon Sperm DNA were investigated by employing differential scanning calorimetry method. For the divalent cations, the shielding effect plays the dominant role in the interaction of nucleic acid chains when they are in low concentrations, as reflected in the moderate increasing of DNA melting temperature. Along with increasing concentration, both alkaline earth metal ions and transitional metal ions were found to lower the DNA melting temperature, indicating possible direct interaction between the divalent cations with the bases in the DNA molecules. The effectiveness increases with the order Mg2+, Ca2+, Mn2+, Co2+ and Ni2+. It was found for the first time that the presence of Mn2+ triggered the biphasic-melting behavior of the Salmon Sperm DNA when the concentration of the cation was increased to a value about 2 times of phosphorous in DNA.

Key words: DNA, Thermal stability, Divalent cation, Biphasic-melting, DSC

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