Linked Life Data

19396376

Source:http://linkedlifedata.com/resource/pubmed/id/19396376

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2009-4-27
pubmed:abstractText
Nanometre-scaled DNA machine based on molecular recognition properties of DNA has now become a powerful tool in nanodevices, miniaturized structure, and nanofabrication. The common principle behind designing a DNA nanomachine is DNA strand exchange or rearrangement, which is solely controlled by the stabilization through associative and dissociative forces arising from base pair interaction of DNA molecules. Thus, highly effective DNA reaction actuator will make DNA nanomachine more flexible, controllable, and powerful device. Here, we report the novel polymer-mediated platform in proton-driven DNA strand rearrangement actuation. This cationic low molecular weight water-soluble chitosan (LMWSC) exhibited pH-dependent complexation with oligodeoxynucleotides (ODN). It formed complex with ODN only at low pH and accelerated the DNA strand exchange (or rearrangement) reaction between dsDNA and its complementary ssDNA at pH 5.0. However, no complexation was observed between LMWSC and ODN at neutral pH. We assume that at physiological pH, LMWSC is not protonated enough for formation of complex with ODN. Therefore, it can not diminish the electrostatic repulsion among the negatively charged DNA strands of the three-stranded intermediate formed during the strand exchange reaction. In contrast, LMWSC becomes positively charged at acidic pH, and it stabilizes the three-stranded intermediate by spreading out the accumulated counter-ions and increasing the entropy of the system. This fascinating observation prompted us to believe that this intelligent proton-driven DNA reaction actuator has a potential for the precise control of DNA nanomachine and would be applied for operating and controlling nanoscaled machine.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1742-2051
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
5
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
391-6
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Chitosan: a novel platform in proton-driven DNA strand rearrangement actuation.
pubmed:affiliation
Department of Chemistry, The Brain Korea 21 Project, Polymer Research Institute, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang 790-784, Korea.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't