Rosette nanotubes are biologically inspired nanostructures, formed through the hierarchical organization of a hybrid DNA base analogue (G∧C), which features hydrogen-bonding arrays of guanine and cytosine. Several twin-G∧C motifs functionalized with chiral moieties, which undergo a self-assembly process under methanolic and aqueous conditions to produce helical rosette nanotubes (RNTs), were synthesized and characterized. The built-in molecular chirality in the twin-G∧C building blocks led to the supramolecular chirality exhibited by the RNTs, as evidenced by the CD activity. Depending on the motifs and environmental conditions, mirror-image supramolecular chirality due to absolute molecular chirality, solvent-induced and structure-dependent supramolecular chirality inversion, and pH-controlled chiroptical switching were observed.
Plant
genetic engineering offers promising solutions to the increasing
demand for efficient, sustainable, and high-yielding crop production
as well as changing environmental conditions. The main challenge for
gene delivery in plants is the presence of a cell wall that limits
the transportation of genes within the cells. Microspores are plant
cells that are, under the right conditions, capable of generating
embryos, leading to the formation of haploid plants. Here, we designed
cationic and fluorescent rosette nanotubes (RNTs) that penetrate the
cell walls of viable wheat microspores under mild conditions and in
the absence of an external force. These nanomaterials can capture
plasmid DNA to form RNT–DNA complexes and transport their DNA
cargo into live microspores. The nanomaterials and the complexes formed
were nontoxic to the microspores.
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