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Title: Amplified stretch of bottlebrush-coated DNA in nanofluidic channels
Authors: Zhang, C.
Hernandez-Garcia, A.
Jiang, K.
Gong, Z.
Guttula, D.
Ng, S.Y.
Malar, P.P. 
Van Kan, J.A. 
Dai, L.
Doyle, P.S.
De Vries, R.
Van Der Maarel, J.R.C. 
Issue Date: Nov-2013
Citation: Zhang, C., Hernandez-Garcia, A., Jiang, K., Gong, Z., Guttula, D., Ng, S.Y., Malar, P.P., Van Kan, J.A., Dai, L., Doyle, P.S., De Vries, R., Van Der Maarel, J.R.C. (2013-11). Amplified stretch of bottlebrush-coated DNA in nanofluidic channels. Nucleic Acids Research 41 (20) : e189-. ScholarBank@NUS Repository.
Abstract: The effect of a cationic-neutral diblock polypeptide on the conformation of single DNA molecules confined in rectangular nanochannels is investigated with fluorescence microscopy. An enhanced stretch along the channel is observed with increased binding of the cationic block of the polypeptide to DNA. A maximum stretch of 85% of the contour length can be achieved inside a channel with a cross-sectional diameter of 200nm and at a 2-fold excess of polypeptide with respect to DNA charge. With site-specific fluorescence labelling, it is demonstrated that this maximum stretch is sufficient to map large-scale genomic organization. Monte Carlo computer simulation shows that the amplification of the stretch inside the nanochannels is owing to an increase in bending rigidity and thickness of bottlebrush-coated DNA. The persistence lengths and widths deduced from the nanochannel data agree with what has been estimated from the analysis of atomic force microscopy images of dried complexes on silica. © The Author(s) 2013. Published by Oxford University Press.
Source Title: Nucleic Acids Research
ISSN: 03051048
DOI: 10.1093/nar/gkt783
Appears in Collections:Staff Publications

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