Abstract
Understanding molecular recognition is of fundamental importance in applications such as therapeutics, chemical catalysis and sensor design. The most common recognition motifs involve biological macromolecules such as antibodies and aptamers. The key to biorecognition consists of a unique three-dimensional structure formed by a folded and constrained bioheteropolymer that creates a binding pocket, or an interface, able to recognize a specific molecule. Here, we show that synthetic heteropolymers, once constrained onto a single-walled carbon nanotube by chemical adsorption, also form a new corona phase that exhibits highly selective recognition for specific molecules. To prove the generality of this phenomenon, we report three examples of heteropolymer-nanotube recognition complexes for riboflavin, L-thyroxine and oestradiol. In each case, the recognition was predicted using a two-dimensional thermodynamic model of surface interactions in which the dissociation constants can be tuned by perturbing the chemical structure of the heteropolymer. Moreover, these complexes can be used as new types of spatiotemporal sensors based on modulation of the carbon nanotube photoemission in the near-infrared, as we show by tracking riboflavin diffusion in murine macrophages.
Original language | English |
---|---|
Pages (from-to) | 959-968 |
Number of pages | 10 |
Journal | Nature Nanotechnology |
Volume | 8 |
Issue number | 12 |
DOIs | |
Publication status | Published - Dec 2013 |
Bibliographical note
Funding Information:The authors thank L. Trudel for her assistance with cell culture. The authors thank D. Wittrup, C. Love and V. Sresht for discussions. This work made use of the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation (grant no. OCI-1053575). M.S.S. acknowledges a grant from the Army Research Office and support via award no. 64655-CH-ISN to the Institute for Solider Nanotechnologies. D.A.H. acknowledges the Damon Runyon Cancer Research Foundation. A.A.B. is funded by the National Defense Science & Engineering Graduate Fellowship. A.J.H. acknowledges funding from the Department of Energy SCGF programme (contract no. DE-AC05-06OR23100). Z.W.U. acknowledges support from the Department of Energy CSGF (DOE grant DE-FG02-97ER25308). M.P.L. acknowledges an NSF postdoctoral research fellowship (award no. DBI-1306229). S.K. was supported by a fellowship from the Deutsche Forschungsmeinschaft (DFG).