期刊
JOURNAL OF BIOTECHNOLOGY
卷 203, 期 -, 页码 45-53出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jbiotec.2015.03.015
关键词
Automation; Eukaryotic cell-free protein synthesis; Integral membrane protein; Non-canonical amino acid; Electrophysiology; Fluorescence modification
资金
- German Ministry of Education and Research (BMBF) [0312039, 0315942]
- German Research Foundation (DFG) [1623]
Due to their high abundance and pharmacological relevance there is a growing demand for the efficient production of functional membrane proteins. In this context, cell-free protein synthesis represents a valuable alternative that allows for the high-throughput synthesis of functional membrane proteins. Here, we demonstrate the potential of our cell-free protein synthesis system, based on lysates from cultured Spodoptera frugiperda 21 cells, to produce pro- and eukaryotic membrane proteins with individual topological characteristics in an automated fashion. Analytical techniques, including confocal laser scanning microscopy, fluorescence detection of eYFP fusion proteins in a microplate reader and in-gel fluorescence of statistically incorporated fluorescent amino acid derivatives were employed. The reproducibility of our automated synthesis approach is underlined by coefficients of variation below 7.2%. Moreover, the functionality of the cell-free synthesized potassium channel KcsA was analyzed electro-physiologically. Finally, we expanded our cell-free membrane protein synthesis system by an orthogonal tRNA/synthetase pair for the site-directed incorporation of p-Azido-L-phenylalanine based on stop codon suppression. Incorporation was optimized by performance of a two-dimensional screening with different Mg2+ and lysate concentrations. Subsequently, the selective modification of membrane proteins with incorporated p-Azido-L-phenylalanine was exemplified by Staudinger ligation with a phosphine-based fluorescence dye. (C) 2015 The Authors. Published by Elsevier B.V.
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