Document Detail


I-Motif-Programmed Functionalization of DNA Nanocircles.
MedLine Citation:
PMID:  23312021     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The folding of various intra- and intermolecular i-motif DNAs is systematically studied to expand the toolbox for the control of mechanical operations in DNA-nanoarchitectures. We analyzed i-motif DNAs under acidic conditions by gel electrophoresis, circular dichroism, and thermal denaturation and show that their intra- versus intermolecular folding primarily depends on the length of the C-tracts. Two stretches of six or fewer C-residues favor the intermolecular folding of i-motifs, whereas longer C-tracts promote the formation of intramolecular i-motif structures with unusually high thermal stability. We then introduced intra- and intermolecular i-motifs formed by DNAs containing two C-tracts into single-stranded regions within otherwise double-stranded DNA nanocircles. By adjusting the length of C-tracts we can control the intra- and intermolecular folding of i-motif DNAs, and achieve programmable functionalization of dsDNA nanocircles. Single-stranded gaps in the nanocircle that are functionalized with an intramolecular i-motif enable the reversible contraction and extension of the DNA circle, as monitored by fluorescence quenching. Thereby, the nanocircle behaves as a proton-fueled DNA prototype machine. In contrast, nanorings containing inter-molecular i-motifs induce the assembly of defined multicomponent DNA architectures in response to proton-triggered predicted structural changes such as dimerization, "kiss", and cyclization. The resulting DNA nanostructures are verified by gel electrophore-sis and visualized by atomic force microscopy (AFM), including different folding topologies of an intermolecular i-motif. The i-motif-functionalized DNA nanocircles may serve as a versatile tool for the formation of larger interlocked dsDNA nanostructures like rotaxanes and catenanes to achieve diverse mechanical operations.
Authors:
Tao Li; Michael Famulok
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-13
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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