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Issue 10, 2017
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Dimer crystallization of chiral proteoids

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Abstract

Proteins can self-assemble into a variety of exquisitely organized structures through hierarchical reaction pathways. To examine how different core shapes of proteins and entropy combine to influence self-assembly, we create systems of lithographically fabricated proteomimetic colloids, or ‘proteoids’, and explore how Brownian monolayers of mobile proteoids, which have hard interactions, self-assemble as they are slowly crowded. Remarkably, chiral C-shaped proteoids having circular heads on only one side form enantiopure lock-and-key chiral dimers; these dimers have corrugated, shape-complementary perimeters, so they, in turn, form lock-and-key arrangements into chiral dimer crystals. Time-lapse video microscopy reveals the expulsion of monomers from the growing dimer crystals through tautomerization translocation reactions which expedite the crystallization kinetics. By lithographically mutating proteoids, we also tune the types and structures of the resulting dimer crystals. Thus, rational design of sub-particle features in hard-core colloidal shapes can be used to sterically select desired self-assembly pathways without introducing any site-specific attractions, thereby generating a striking degree of hierarchical self-ordering, reminiscent of protein crystallization.

Graphical abstract: Dimer crystallization of chiral proteoids

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Supplementary files

Article information


Submitted
07 Dec 2016
Accepted
12 Feb 2017
First published
13 Feb 2017

Phys. Chem. Chem. Phys., 2017,19, 7167-7175
Article type
Paper

Dimer crystallization of chiral proteoids

P. Wang and T. G. Mason, Phys. Chem. Chem. Phys., 2017, 19, 7167
DOI: 10.1039/C6CP08350A

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