mRNA Delivery and Storage by Co-Assembling Nanostructures with Designer Oligopeptides.

Broadening the applicable tools for mRNA delivery provides more flexibility in research and those proven effective and safe can potentially be translated for clinical use. We report here a 27-amino acid peptide sequence mimicking the viral capsid protein, termed pepMAX, capable of co-assembling with mRNA into 100-150 nm nanostructures for efficient transfection of multiple cell lines. The mRNA loading and N/P ratio have been systematically optimized for each cell line. In HeLa, HEK293, and SKNMC, the transfection attained (>80%) is comparable with that of commercially available vectors Lipofectamine MessengerMAX TM (LipoMMAX). Confocal microscopy reveals that pepMAX efficiently delivers mRNA into the cytosol and induces efficient protein production. The pepMAX/mRNA co-assemblies retain their transfection efficiency after storage up to one week at room temperature in lyophilized form.