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Modification of the Langmuir-Schaefer method for fabrication of ordered protein films

机译:朗米尔 - 舍甫佛法制备有序蛋白薄膜的修改

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摘要

A modification of the Langmuir-Schaefer method for the fabrication of high-quality protein films on a solid substrate was proposed and applied to lysozyme. The procedure relies on the use of a pre-prepared protein solution, the parameters of which correspond to crystallization conditions. A lysozyme Langmuir monolayer was shown to be formed with the involvement of complexes, namely, dimers and octamers of protein molecules that are present in such protein solutions. These complexes apparently retain the structure after spreading a protein solution onto an aqueous subphase in a Langmuir trough. The thickness of the film after the transfer of the monolayer, which was formed by the proposed procedure, onto a solid substrate corresponds to the diameter of the octamer and this film is dense, continuous, and uniform, as was demonstrated by several methods: X-ray reflectivity, total external reflection X-ray standing wave, and atomic force microscopy. A layer of chloride ions that formed under the Langmuir monolayer was found at the air-protein film interface. This fact confirms an important role of the precipitating agent (chloride ions) in all steps of the formation of lysozyme films.
机译:提出了用于在固体基质上制造高质量蛋白质膜的Langmuir-Schaefer方法的修改,并施加到溶菌酶上。该方法依赖于使用预制备的蛋白质溶液,其参数对应于结晶条件。显示了溶菌酶Langmuir单层,如络合物的累积,即蛋白质分子中存在的蛋白质分子的二聚体和八羟胺形成形成。这些配合物在将蛋白质溶液涂布到朗米尔槽中的亚壳水溶性后,显然保持该结构。通过所提出的方法形成的单层转移到固体基质上的单层后膜的厚度对应于八寡壳的直径,并且该薄膜是致密的,连续的和均匀的,如几种方法所示:x - 射线反射率,全外反射X射线常设波和原子力显微镜。在空气蛋白薄膜界面中发现在朗米尔单层下形成的氯化物离子层。这一事实证明了沉淀剂(氯离子)在形成溶菌酶薄膜的所有步骤中的重要作用。

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  • 来源
    《Crystallography reports》 |2017年第4期|共7页
  • 作者单位

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

    Russian Acad Sci Fed Sci Res Ctr Crystallog &

    Photon Shubnikov Inst Crystallog Moscow 119333 Russia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
  • 关键词

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