Peptide-oligonucleotide conjugates as nanoscale building blocks for assembly of an artificial three-helix protein mimic

Chenguang Lou, Manuel C Martos-Maldonado, Charlotte S Madsen, Rasmus P Thomsen, Søren Roi Midtgaard, Niels Johan Christensen, Jørgen Kjems, Peter W Thulstrup, Jesper Wengel, Knud J Jensen

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Abstract

Peptide-based structures can be designed to yield artificial proteins with specific folding patterns and functions. Template-based assembly of peptide units is one design option, but the use of two orthogonal self-assembly principles, oligonucleotide triple helix and a coiled coil protein domain formation have never been realized for de novo protein design. Here, we show the applicability of peptide-oligonucleotide conjugates for self-assembly of higher-ordered protein-like structures. The resulting nano-assemblies were characterized by ultraviolet-melting, gel electrophoresis, circular dichroism (CD) spectroscopy, small-angle X-ray scattering and transmission electron microscopy. These studies revealed the formation of the desired triple helix and coiled coil domains at low concentrations, while a dimer of trimers was dominating at high concentration. CD spectroscopy showed an extraordinarily high degree of α-helicity for the peptide moieties in the assemblies. The results validate the use of orthogonal self-assembly principles as a paradigm for de novo protein design.

Original languageEnglish
Article number12294
JournalNature Communications
Volume7
Pages (from-to)1-9
ISSN2041-1723
DOIs
Publication statusPublished - 2016

Keywords

  • Journal Article

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