In vitro investigation of protein assembly by combined microscopy and infrared spectroscopy at the nanometer scale

Zhao X; Li D; Lu Y.-HRad BYan CBechtel H.AAshby P.DSalmeron M.B

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In vitro investigation of protein assembly by combined microscopy and infrared spectroscopy at the nanometer scale

机译：In vitro investigation of protein assembly by combined microscopy and infrared spectroscopy at the nanometer scale

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The nanoscale structure and dynamics of proteins on surfaces has been extensively studied using various imaging techniques, such as transmission electron microscopy and atomic force microscopy (AFM) in liquid environments. These powerful imaging techniques, however, can potentially damage or perturb delicate biological material and do not provide chemical information, which prevents a fundamental understanding of the dynamic processes underlying their evolution under physiological conditions. Here, we use a platform developed in our laboratory that enables acquisition of infrared (IR) spectroscopy and AFM images of biological material in physiological liquids with nanometer resolution in a cell closed by atomically thin graphene membranes transparent to IR photons. In this work, we studied the self-assembly process of S-layer proteins at the graphene-aqueous solution interface. The graphene acts also as the membrane separating the solution containing the proteins and Ca2+ ions from the AFM tip, thus eliminating sample damage and contamination effects. The formation of S-layer protein lattices and their structural evolution was monitored by AFM and by recording the amide I and II IR absorption bands, which reveal the noncovalent interaction between proteins and their response to the environment, including ionic strength and solvation. Our measurement platform opens unique opportunities to study biological material and soft materials in general. ? 2022 the Author(s).

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《Proceedings of the National Academy of Sciences of the United States of America.》 |2022年第32期|e2200019119-e2200019119|共1页
作者
Zhao X; Li D; Lu Y.-HRad BYan CBechtel H.AAshby P.DSalmeron M.B;
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作者单位

Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, CA;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
nano-FTIR; operando spectroscopy; S-layer protein; self-assembly; solid-liquid interface;

In vitro investigation of protein assembly by combined microscopy and infrared spectroscopy at the nanometer scale

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