Induced Chirality in QDs Using Thermoresponsive Elastin-like Polypeptides

Lowe, Christopher D.; Larson, Helen C.; Cai, Yifeng; Chiang, Huat Thart; Pozzo, Lilo D.; Baneyx, François; Cossairt, Brandi M.

doi:10.1021/acs.langmuir.4c04339

Title: Induced Chirality in QDs Using Thermoresponsive Elastin-like Polypeptides

Journal Article · 30 December 2024 · Langmuir

DOI: https://doi.org/10.1021/acs.langmuir.4c04339 · OSTI ID:2499568

Lowe, Christopher D. ^[1]; Larson, Helen C. ^[1]; Cai, Yifeng ^[1];

^[1];

^[1]

University of Washington, Seattle, WA (United States)

Circular dichroism (CD) spectroscopy has emerged as a potent tool for probing chiral small-molecule ligand exchange on natively achiral quantum dots (QDs). In this study, we report a novel approach to identifying QD–biomolecule interactions by inducing chirality in CdS QDs using thermoresponsive elastin-like polypeptides (ELPs) engineered with C-terminal cysteine residues. Our method is based on a versatile two-step ligand exchange process starting from monodisperse oleate-capped QDs in nonpolar media and proceeding through an easily accessed achiral glycine-capped QD intermediate. Successful conjugation of the ELPs onto the QDs is confirmed by the diagnostic CD response corresponding to the QD electronic transitions in the visible range. The resulting ELP:CdS conjugates demonstrate thermally reversible coacervation, as observed through dynamic light scattering, small-angle X-ray scattering, and electron microscopy. Furthermore, this research provides a foundation for using induced chirality in QD electronic transitions to probe QD conjugation to complex peptides and proteins, opening pathways for designing dynamic, stimuli-responsive hybrid nanomaterials.

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Research Organization:: University of Washington, Seattle, WA (United States)

Sponsoring Organization:: National Science Foundation (NSF); SINE2020; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019288

OSTI ID:: 2499568

Journal Information:: Langmuir, Journal Name: Langmuir Journal Issue: 1 Vol. 41; ISSN 0743-7463

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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