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Harnessing Peptide Binding to Capture and Reclaim Phosphate

preprint
submitted on 06.08.2020 and posted on 07.08.2020 by Whitney Fowler, Chuting Deng, Gabriella Griffen, Tess Teodoro, Ashley Z. Guo, Michal Zaiden, Moshe Gottlieb, Juan de Pablo, Matthew Tirrell
With rising consumer demands, society is tapping into wastewater as an innovative source to recycle depleting resources. Novel reclamation technologies have been recently explored for this purpose, including several that optimize natural biological processes for targeted reclamation. However, this emerging field has a noticeable dearth of synthetic material technologies that are programmed to capture, release and recycle specified targets, and of the novel materials that do exist, synthetic platforms incorporating biologically inspired mechanisms are rare. We present here a prototype of a materials platform utilizing peptide amphiphiles that has been molecularly engineered to sequester, release, and reclaim phosphate utilizing a stimuli-responsive pH trigger, exploiting a protein-inspired binding mechanism that is incorporated directly into the self-assembled material network. This material is able to sequester completely and controllably release phosphate for multiple cycles of reuse. We have determined by simulations that the binding conformation of the peptide becomes constrained in the dense micelle corona at high pH such that phosphate is expelled when it otherwise would be preferentially bound. However, at neutral pH, this dense structure conversely employs multi-chain binding to further stabilize phosphate when it would otherwise be unbound, opening opportunities for higher-order conformational binding design to be engineered into this controllably packed corona. With this work, we are pioneering a new platform to be readily altered to capture other valuable targets, presenting a new class of capture and release materials for recycling resources on the nanoscale.

Funding

National Science Foundation DMR-1710357

U.S. Israel Binational Science Foundation Grant 2016664

NSF-BSF Grant 2016664

W.C.F. acknowledges support from the National Science Foundation (NSF) Graduate Research Fellowship Program under Grant No. (DGE-1746045)

M.Z. acknowledges support from the Kreitman Post-doctoral Research Fellowship

History

Email Address of Submitting Author

wcfowler@uchicago.edu

Institution

University of Chicago

Country

United States

ORCID For Submitting Author

0000-0002-8088-4744

Declaration of Conflict of Interest

The authors declare no competing financial interests.

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