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• W2316648814 abstract "Hybrids of biological molecules and single-walled carbon nanotubes (SWCNT) have proven useful for SWCNT sorting and are enabling several biomedical applications in sensing, imaging, and drug delivery. In the DNA-SWCNT system, certain short (10–20mer) sequences of single-stranded DNA recognize specific SWCNT, allowing the latter to be sorted from a chirality diverse mixture.(1) However, little is known about the DNA secondary structures that underlie their recognition of SWCNTs. Using replica exchange molecular dynamics (REMD) of multiple strands on a single SWCNT, we report that DNA forms ordered structures on SWCNTs that are strongly DNA sequence and SWCNT dependent. DNA sequence (TAT)4 on its recognition partner, the (6,5) SWCNT,(1) forms an ordered right-handed helically wrapped barrel, stabilized by intrastrand, self-stitching hydrogen bonds and interstrand hydrogen bonding. The same sequence on the larger diameter (8,7)-SWCNT forms a different and less-stable structure, demonstrating SWCNT selectivity. In contrast, homopolymer (T)12, with weaker tendency for intrastrand hydrogen bonding, forms a distinctly left-handed wrap on the (6,5)-SWCNT, demonstrating DNA sequence specificity. Experimental measurements show that (TAT)4 selectively disperses smaller diameter SWCNTs more efficiently than (T)12, establishing a relationship between recognition motifs and binding strength. The developing understanding of DNA secondary structure on nanomaterials can shed light on a number of issues involving hybrids of nanomaterials and biological molecules, including nanomedicine, health-effects of nanomaterials, and nanomaterial processing." @default.
• W2316648814 created "2016-06-24" @default.
• W2316648814 creator A5003116978 @default.
• W2316648814 creator A5006540573 @default.
• W2316648814 creator A5088540108 @default.
• W2316648814 date "2012-03-06" @default.
• W2316648814 modified "2023-10-11" @default.
• W2316648814 title "Molecular-Basis of Single-Walled Carbon Nanotube Recognition by Single-Stranded DNA" @default.
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• W2316648814 doi "https://doi.org/10.1021/nl204182b" @default.
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