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A Short Peptide Synthon for Liquid-Liquid Phase Separation

preprint
submitted on 27.08.2020 and posted on 28.08.2020 by Manzar Abbas, Wojciech P. Lipiński, Karina K. Nakashima, Wilhelm T.S. Huck, Evan Spruijt
Liquid-liquid phase separation of disordered proteins has emerged as a ubiquitous route to membraneless compartments in living cells, and similar coacervates may have played a role when the first cells formed. However, existing coacervates are typically made of multiple macromolecular components, and designing short peptide analogues capable of self-coacervation has proven difficult. Here, we present a short peptide synthon for phase separation, made of only two dipeptide stickers linked via a flexible, hydrophilic spacer. These small-molecule compounds self-coacervate into micrometre-sized liquid droplets at sub-mM concentrations, which retain up to 75 weight-% water. The design is general and we derive guidelines for the required sticker hydrophobicity and spacer polarity. To illustrate their potential as protocells, we create a disulphide-linked derivative that undergoes reversible compartmentalisation controlled by redox chemistry. The resulting coacervates sequester and melt nucleic acids, and act as microreactors that catalyse two different anabolic reactions yielding molecules of increasing complexity. This provides a stepping stone for new protocells made of single peptide species.

History

Email Address of Submitting Author

e.spruijt@science.ru.nl

Institution

Radboud University Nijmegen

Country

Netherlands

ORCID For Submitting Author

0000-0003-4793-9923

Declaration of Conflict of Interest

The authors declare no competing interests.

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