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Factors Affecting Solubility04:01

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
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Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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脱氧-米奥-伊诺西托酸盐的化学和生物学:在考古和细菌IMPase中基质相互作用的立体特异性.

Adam J Morgan1, Yangling Karen Wang, Mary F Roberts

  • 1Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467-3860, USA.

Journal of the American Chemical Society
|November 26, 2004
PubMed
概括

研究人员合成了新的myo-inositol-monophosphates来研究酶的特异性. 这项工作揭示了内醇单酸酶 (IMPases) 中的关键相互作用,并预测了大肠杆菌IMPase的基底结合.

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科学领域:

  • 生物化学 生物化学
  • 酶学 是一种酶学.
  • 有机合成 有机合成

背景情况:

  • 伊诺单酸酶 (IMPases) 在细胞信号通路中起着至关重要的作用.
  • 了解酶基质相互作用对于药物发现和酶工程至关重要.
  • 对于IMPases的立体特异性仍然不完全理解,特别是对于缺乏结构数据的酶.

研究的目的:

  • 为了合成新型的,性纯的myo-inositol-monophosphate类似物.
  • 为了研究两个不同的IMPases的酶基质相互作用的立体特异性.
  • 用合成的类似物和结构数据阐明基质结合模式.

主要方法:

  • 催化不对称酸化用于合成六种myo-inositol-monophosphates,包括四种无氧化类似物.
  • 酶动力学测试使用合成的类似物作为IMPases的基质.
  • 具有绑定基质 (d-I-1P) 的Archaeoglobus fulgidus IMPase的X射线晶体学.

主要成果:

  • 成功合成了以基为纯的myo-inositol-monophosphate类似物.
  • 动力学分析显示,活性部位内的某些基接触是破坏稳定的,而其他接触的影响最小.
  • 合成的探针使得能够预测Escherichia coli IMPase的活性部位结合模式.

结论:

  • 这项研究提供了新的化学探针来研究IMPase立体特异性.
  • 获得了关于基组相互作用在酶活性位点中的能量贡献的关键见解.
  • 这项工作促进了IMPases的结构和功能表征,包括那些没有现有的晶体结构的IMPases.