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Reversible conformational changes in the parallel type G-quadruplex structure inside a thermoresponsive hydrogel.

Erika Hasuike1, Aya Mizutani Akimoto2, Reiko Kuroda3

  • 1Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan. akimoto@cross.t.u-tokyo.ac.jp ryo@cross.t.u-toyo.ac.jp and Faculty of Pharmacy, Keio University, Tokyo, Japan.

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|March 2, 2017
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Summary

Researchers discovered thermoresponsive hydrogels can reversibly regulate parallel G-quadruplexes with mild temperature shifts. This study is the first to show poly(N-isopropylacrylamide) gel controlling single-stranded DNA structure.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • G-quadruplexes are nucleic acid structures with roles in various biological processes.
  • Thermoresponsive hydrogels, like poly(N-isopropylacrylamide) (PNIPAAm), exhibit significant volume changes with temperature.
  • Controlling G-quadruplex structure is crucial for understanding and manipulating their biological functions.

Purpose of the Study:

  • To investigate the novel property of reversible G-quadruplex regulation by thermoresponsive hydrogels.
  • To explore the potential of PNIPAAm gels in controlling the steric structure of single-stranded DNA (ssDNA).

Main Methods:

  • Utilized a universal chiroptical spectrophotometer 1 (UCS-1) for measurements.
  • Employed poly(N-isopropylacrylamide) (PNIPAAm) hydrogels.
  • Investigated parallel type G-quadruplexes under moderate temperature changes.

Main Results:

  • Demonstrated reversible regulation of parallel G-quadruplexes through moderate temperature variations in PNIPAAm hydrogels.
  • Showcased the ability of PNIPAAm gel to influence and control the steric structure of ssDNA.
  • Confirmed the novelty of this temperature-dependent regulation mechanism.

Conclusions:

  • Thermoresponsive hydrogels offer a novel method for the reversible control of G-quadruplex structures.
  • PNIPAAm gels can be utilized to modulate ssDNA conformation, opening new avenues in nucleic acid research.
  • This finding provides a new strategy for designing smart materials with responsive DNA-binding capabilities.