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DNA Functionality with Photoswitchable Hydrazone Cytidine*.

Song Mao1,2, Zhihua Chang1,2, Ya Ying Zheng1,2

  • 1Department of Chemistry, University at Albany, State University of New York, 1400 Washington Ave., Albany, NY, 1222, USA.

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Summary
This summary is machine-generated.

Researchers developed photoswitchable DNA using hydrazone-modified cytidine. Blue light triggers E-Z isomerization, inhibiting DNA synthesis and causing mutations, offering new tools for chemical biology.

Keywords:
DNA functionDNA synthesishydrazone photoswitchphotoregulationsolid phase synthesis

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Area of Science:

  • Chemical Biology
  • Molecular Biology
  • Synthetic Chemistry

Background:

  • Development of functional DNA building blocks is crucial for advanced applications.
  • Photoswitchable molecules offer precise control over biological processes.
  • Cytidine modifications can introduce novel functionalities into DNA.

Purpose of the Study:

  • To synthesize and incorporate a novel hydrazone-modified cytidine phosphoramidite building block into DNA.
  • To create photoswitchable DNA strands using blue light irradiation.
  • To investigate the impact of this modification on DNA synthesis and enzyme interactions.

Main Methods:

  • Synthesis of hydrazone-modified cytidine phosphoramidite.
  • Incorporation into oligodeoxynucleotides.
  • Characterization using 1H NMR spectroscopy and HPLC.
  • Inhibition assays using Bst DNA polymerase and primer extension models.

Main Results:

  • Successful synthesis and incorporation of the modified building block.
  • Confirmation of E-Z isomerization of the hydrazone moiety upon blue light (450 nm) irradiation.
  • The Z-isomer inhibited DNA synthesis by Bst DNA polymerase.
  • Observed misincorporation of dATP and dGTP, suggesting potential G to A mutations.

Conclusions:

  • A novel photoswitchable DNA building block was created.
  • The modified DNA can be controlled using cell-friendly blue light.
  • This offers a new molecular tool for controlling DNA synthesis and DNA-enzyme interactions with potential biomedicinal applications.