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Kinetics and thermodynamics of DNA, RNA, and hybrid duplex formation

机译:DNA,RNA和杂交双链体形成的动力学和热力学

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摘要

The rates of duplex formation for two octamers of DNA (5′ d-CACGGCTC/5′ d-GAGCCGTG and 5′ d-CACAGCAC/5′ d-GTGCTGTG), the homologous RNA, and both sets of hybrids in 1 M NaCl buffer have been measured using stopped-flow spectroscopy. In addition, the thermodynamic parameters, ΔH and ΔS, have been determined for the same sequences under the same buffer conditions using optical melting techniques. These data reveal a linear free energy relationship between the free energy of activation for denaturation and the change in free energy for formation of the duplexes. This relationship indicates that these duplex formation reactions occur through a common unstructured transition state that is more similar to the single strands in solution than to the ensuing duplex. In addition, these data confirm that the greater stability of RNA duplexes relative to that of homologous DNA and hybrid duplexes is controlled by the denaturation rate and not the duplex formation rate.
机译:DNA(5'D-Cacggccc / 5'D-Gagccgtg和5'D-Cacagcac / 5'D-GTGCTG),同源RNA和两组杂种中的双工形成的双链体形成速率在1M NaCl缓冲液中 已经使用停止流动光谱测量。 另外,使用光学熔化技术在相同的缓冲条件下已经确定了热力学参数,ΔH和ΔS。 这些数据揭示了激活的自由能量与变性的可自由能量和用于形成双链体的自由能的变化之间的线性自由能关系。 这种关系表明,这些双工形成反应通过常见的非结构化过渡状态发生,该转换状态与溶液中的单链更类似于与随后的双工相同。 另外,这些数据证实,通过变性率而不是双工形成速率来控制相对于同源DNA和混合双链体的RNA双链体的更大稳定性。

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  • 来源
    《Biochemistry》 |2013年第5期|共8页
  • 作者单位

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

    Department of Chemistry Allegheny College 520 North Main Street Meadville PA 16335 United States;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物化学;
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