bm9b00131_si_001.pdf (1.24 MB)
Construction of One- and Two-Dimensional Nanostructures by the Sequential Assembly of Quadruplex DNA Scaffolds
journal contribution
posted on 2019-05-01, 00:00 authored by Yanwei Cao, Ye Kuang, Luyan Yang, Pi Ding, Renjun PeiA quadruplex-integrated
assembly method is proposed for the organization
and regulation of various nanoscale architectures. In this method,
two types of one-dimensional DNA nanostructures formed by two well-designed
GC-rich single strands assemble into two-dimensional (2D) DNA nanostructures
based on the self-assembly of dimeric G-quadruplex and I-motif structures.
Subsequently, a C-rich strand and two biotin-modified G-rich strands
primordially form a notched double helix in LiCl solution (pH 8).
However, a linear “DNA–protein” nanostructure
linked by I-motif structures and biotin–streptavidin interaction
can be formed when hydrogen ions and streptavidin are sequentially
titrated. Furthermore, the linear “DNA–protein”
nanostructure is assembled into 2D nanomaterials connected by K+-stabilized G-quadruplexes formed from terminal G-rich repeats
of the two G-rich strands. Interestingly, the 2D nanohybrids form
two-lined “DNA–protein” nanostructures if the
terminal G-rich repeats in one of the biotin-modified G-rich strands
are removed. Our results indicate that quadruplex DNAs are promising
building blocks in the fabrication of nanomaterials and that the assembly
of quadruplex DNAs has potential applications in the directional arrangement
of macromolecules.