Elucidating the mechanism of the considerable mechanical stiffening of DNA induced by the couple Zn(2+/)Calix[4]arene-1,3-O-diphosphorous acid

作者：Tauran Yannick; Tarhan Mehmet C; Mollet Laurent; Gerves Jean Baptiste; Kumemura Momoko; Jalabert Laurent; Lafitte Nicolas; Byun Ikjoo; Kim Beomjoon; Fujita Hiroyuki; Collard Dominique; Perret Florent; De**rosses Mickael; Leonard Didier; Goutaudier Christelle; Coleman Anthony W^*

来源：Scientific Reports, 2018, 8(1): 1226.

DOI：10.1038/s41598-018-19712-4

The couple Calix[4] arene-1,3-O-diphosphorous acid (C4diP) and zinc ions (Zn2+) acts as a synergistic DNA binder. Silicon NanoTweezer (SNT) measurements show an increase in the mechanical stiffness of DNA bundles by a factor of >150, at Zn2+ to C4diP ratios above 8, as compared to Zinc alone whereas C4diP alone decreases the stiffness of DNA. Electroanalytical measurements using 3D printed devices demonstrate a progression of events in the assembly of C4diP on DNA promoted by zinc ions. A mechanism at the molecular level can be deduced in which C4diP initially coordinates to DNA by phosphate-phosphate hydrogen bonds or in the presence of Zn2+ by Zn2+ bridging coordination of the phosphate groups. Then, at high ratios of Zn2+ to C4diP, interdigitated dimerization of C4diP is followed by cross coordination of DNA strands through Zn2+/C4diP inter-strand interaction. The sum of these interactions leads to strong stiffening of the DNA bundles and increased inter-strand binding.

• 出版日期2018-1-19