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Luminescent platinum(II) complexes with functionalized N-heterocyclic carbene or diphosphine selectively probe mismatched and abasic DNA

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  • Sin Ki Fung

    (State Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional Materials, Chemical Biology Centre, The University of Hong Kong)

  • Taotao Zou

    (State Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional Materials, Chemical Biology Centre, The University of Hong Kong
    HKU Shenzhen Institute of Research and Innovation Shenzhen)

  • Bei Cao

    (State Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional Materials, Chemical Biology Centre, The University of Hong Kong)

  • Tianfeng Chen

    (Jinan University)

  • Wai-Pong To

    (State Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional Materials, Chemical Biology Centre, The University of Hong Kong)

  • Chen Yang

    (State Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional Materials, Chemical Biology Centre, The University of Hong Kong
    HKU Shenzhen Institute of Research and Innovation Shenzhen)

  • Chun-Nam Lok

    (State Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional Materials, Chemical Biology Centre, The University of Hong Kong)

  • Chi-Ming Che

    (State Key Laboratory of Synthetic Chemistry, Institute of Molecular Functional Materials, Chemical Biology Centre, The University of Hong Kong
    HKU Shenzhen Institute of Research and Innovation Shenzhen)

Abstract

The selective targeting of mismatched DNA overexpressed in cancer cells is an appealing strategy in designing cancer diagnosis and therapy protocols. Few luminescent probes that specifically detect intracellular mismatched DNA have been reported. Here we used Pt(II) complexes with luminescence sensitive to subtle changes in the local environment and report several Pt(II) complexes that selectively bind to and identify DNA mismatches. We evaluated the complexes’ DNA-binding characteristics by ultraviolet/visible absorption titration, isothermal titration calorimetry, nuclear magnetic resonance and quantum mechanics/molecular mechanics calculations. These Pt(II) complexes show up to 15-fold higher emission intensities upon binding to mismatched DNA over matched DNA and can be utilized for both detecting DNA abasic sites and identifying cancer cells and human tissue samples with different levels of mismatch repair. Our work highlights the potential of luminescent Pt(II) complexes to differentiate between normal cells and cancer cells which generally possess more aberrant DNA structures.

Suggested Citation

  • Sin Ki Fung & Taotao Zou & Bei Cao & Tianfeng Chen & Wai-Pong To & Chen Yang & Chun-Nam Lok & Chi-Ming Che, 2016. "Luminescent platinum(II) complexes with functionalized N-heterocyclic carbene or diphosphine selectively probe mismatched and abasic DNA," Nature Communications, Nature, vol. 7(1), pages 1-9, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10655
    DOI: 10.1038/ncomms10655
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