Co-Translational Insertion of Aquaporins into Liposome for Functional Analysis 
via an E. coli Based Cell-Free Protein Synthesis System

Yue, Ke; Tran Trung, Nam; Zhu, Yiyong; Kaldenhoff, Ralf; Kai, Lei

doi:10.3390/cells8111325

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Co-Translational Insertion of Aquaporins into Liposome for Functional Analysis via an E. coli Based Cell-Free Protein Synthesis System

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Kai, Lei
Schwille, Petra / Cellular and Molecular Biophysics, Max Planck Institute of Biochemistry, Max Planck Society;

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Citation

Yue, K., Tran Trung, N., Zhu, Y., Kaldenhoff, R., & Kai, L. (2019). Co-Translational Insertion of Aquaporins into Liposome for Functional Analysis via an E. coli Based Cell-Free Protein Synthesis System. CELLS, 8(11): 1325. doi:10.3390/cells8111325.

Cite as: https://hdl.handle.net/21.11116/0000-0005-9D09-1

Abstract

Aquaporins are important and well-studied water channel membrane proteins. However, being membrane proteins, sample preparation for functional analysis is tedious and time-consuming. In this paper, we report a new approach for the co-translational insertion of two aquaporins from Escherichia coli and Nicotiana tabacum using the CFPS system. This was done in the presence of liposomes with a modified procedure to form homogenous proteo-liposomes suitable for functional analysis of water permeability using stopped-flow spectrophotometry. Two model aquaporins, AqpZ and NtPIP2;1, were successfully incorporated into the liposome in their active forms. Shifted green fluorescent protein was fused to the C-terminal part of AqpZ to monitor its insertion and status in the lipid environment. This new fast approach offers a fast and straightforward method for the functional analysis of aquaporins in both prokaryotic and eukaryotic organisms.