American Chemical Society
ja8b06144_si_001.pdf (3.42 MB)

Cell Penetration Profiling Using the Chloroalkane Penetration Assay

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journal contribution
posted on 2018-08-17, 00:00 authored by Leila Peraro, Kirsten L. Deprey, Matthew K. Moser, Zhongju Zou, Haydn L. Ball, Beth Levine, Joshua A. Kritzer
Biotherapeutics are a promising class of molecules in drug discovery, but they are often limited to extracellular targets due to their poor cell penetration. High-throughput cell penetration assays are required for the optimization of biotherapeutics for enhanced cell penetration. We developed a HaloTag-based assay called the chloroalkane penetration assay (CAPA), which is quantitative, high-throughput, and compartment-specific. We demonstrate the ability of CAPA to profile extent of cytosolic penetration with respect to concentration, presence of serum, temperature, and time. We also used CAPA to investigate structure–penetration relationships for bioactive stapled peptides and peptides fused to cell-penetrating sequences. CAPA is not only limited to measuring cytosolic penetration. Using a cell line where HaloTag is localized to the nucleus, we show quantitative measurement of nuclear penetration. Going forward, CAPA will be a valuable method for measuring and optimizing the cell penetration of biotherapeutics.