Volume 57, Issue 48 pp. 15723-15727
Communication

Mirror-Image Dependence: Targeting Enantiomeric G-Quadruplex DNA Using Triplex Metallohelices

Chuanqi Zhao

Chuanqi Zhao

Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022 P. R. China

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Hualong Song

Hualong Song

Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL UK

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Prof. Peter Scott

Prof. Peter Scott

Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL UK

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Andong Zhao

Andong Zhao

University of Chinese Academy of Sciences, Beijing, 100039 P. R. China

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Dr. Hisae Tateishi-Karimata

Dr. Hisae Tateishi-Karimata

FIBER, Konan University, Kobe, 650-0047 Japan

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Prof. Naoki Sugimoto

Prof. Naoki Sugimoto

FIBER, Konan University, Kobe, 650-0047 Japan

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Prof. Jinsong Ren

Prof. Jinsong Ren

Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022 P. R. China

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Prof. Xiaogang Qu

Corresponding Author

Prof. Xiaogang Qu

Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022 P. R. China

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First published: 11 October 2018
Citations: 52

Graphical Abstract

Mirror, mirror: Chiral recognition of DNA plays crucial roles in many DNA-relevant events. The binding of ten pairs of iron helical metallohelices to enantiomeric G-quadruplex DNA was screened. The results clearly show mirror-image dependence for the Δ- and Λ-enantiomers binding to d- and l-DNA, respectively.

Abstract

Natural d-DNA and l-DNA are mirror-image counterparts. However, because of the inherent flexibility and conformation diversity of DNA, it is still not clear how enantiomeric compounds recognize d-DNA and l-DNA. Herein, taking G-quadruplex (G4) DNA as an example that has diverse conformations and distinct biofunctions, the binding of ten pairs of iron triplex metallohelices to d- and l-G4 DNA were evaluated. The Δ-enantiomer binds to d-DNA and the Λ-enantiomer binds to l-DNA, exhibiting almost the same stabilization effect and binding affinity. The binding affinity of the Δ-metallohelix with d-G4 is nearly 70-fold higher than that of Λ-metallohelix binding d-G4. Δ-Metallohelix binding to d-G4 follows a two-step binding process driven by a favorable enthalpy contribution to compensate for the associated unfavorable entropy.

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