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Screening of Ruthenium Complexes as the Protein Light Switches for Protein Detection.

Hao Liu1, Qin-Feng Xu1, Zhao-Zhao Zhang1

  • 1School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China.

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Summary

Researchers developed a computational strategy to screen Ruthenium(II)-dipyrido[3,2-a:2',3'-c]phenazine (Ru-dppz) complexes as protein light switches. A novel complex, [Ru(dppz)2dip]2+, shows high sensitivity for human serum albumin detection.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Ruthenium(II)-dipyrido[3,2-a:2",3"-c]phenazine (dppz) complexes are established molecular light switches for DNA assays.
  • Adapting these light switches for protein detection is challenging due to proteins' complex structures compared to nucleic acids.

Purpose of the Study:

  • To develop a computational virtual screening strategy for identifying light switches capable of protein detection.
  • To discover novel Ru-dppz complexes with enhanced performance for protein assays.

Main Methods:

  • Computational virtual screening of Ru-dppz complexes for protein binding affinity.
  • Synthesis and characterization of promising Ru-dppz candidates.
  • Luminescence spectroscopy to evaluate light-switching performance and sensitivity.
  • Development of a smartphone-integrated point-of-care device.

Main Results:

  • The binding affinity of Ru-dppz complexes to proteins is influenced by ligand structure and ratio, impacting light-switching performance.
  • [Ru(dppz)2dip]2+ demonstrated a 280.0-fold luminescence enhancement for human serum albumin (HSA) detection, with strong hydrophobic and π-cation interactions.
  • The developed system achieved a limit of detection of 0.0093 mg/L for HSA and a rapid response time (<1 s).
  • The strategy was successfully extended to detect β-lactoglobulin with a 346.1-fold luminescence enhancement.

Conclusions:

  • A universal computational approach for discovering high-performance protein light switches was established.
  • [Ru(dppz)2dip]2+ serves as an effective light switch for HSA detection, enabling sensitive and rapid assays.
  • The developed technology holds significant promise for applications in biomedical research and clinical diagnostics.