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Probing biocatalytic transformations with CdSe-ZnS QDs.

Ron Gill1, Ronit Freeman, Jian-Ping Xu

  • 1Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Journal of the American Chemical Society
|November 30, 2006
PubMed
Summary

Cadmium selenide/zinc sulfide quantum dots (CdSe/ZnS QDs) detect enzyme activity. Their luminescence changes indicate tyrosine oxidation and peptide cleavage by thrombin.

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Area of Science:

  • Bioconjugate chemistry
  • Nanomaterials science
  • Enzyme kinetics

Background:

  • Cadmium selenide/zinc sulfide quantum dots (CdSe/ZnS QDs) are fluorescent nanoparticles with tunable optical properties.
  • Tyrosine derivatives and peptides are important biological molecules involved in various enzymatic processes.
  • Thrombin is a key enzyme in blood coagulation, and its activity is crucial for hemostasis.

Purpose of the Study:

  • To develop a method for optically probing the biocatalytic oxidation of tyrosine derivatives using CdSe/ZnS QDs.
  • To investigate the use of CdSe/ZnS QDs for detecting peptide cleavage by the enzyme thrombin.
  • To establish a sensing platform based on luminescence changes of QDs.

Main Methods:

  • Modification of CdSe/ZnS QDs with tyrosine methyl ester or a tyrosine-containing peptide.

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  • Enzymatic reaction of tyrosine units with tyrosinase and oxygen to form l-DOPA and quinone derivatives.
  • Monitoring luminescence quenching of QDs upon quinone formation.
  • Observing luminescence restoration of QDs after thrombin-mediated cleavage of quinone-functionalized peptides.

    • Main Results:

    • Luminescence of QDs was quenched when modified with enzyme-generated quinone derivatives of tyrosine.
    • Cleavage of the quinone-functionalized peptide by thrombin led to the restoration of QD luminescence.
    • This demonstrates a turn-on fluorescence sensing mechanism.

    Conclusions:

    • CdSe/ZnS QDs can be effectively used as optical probes for monitoring enzymatic reactions involving tyrosine derivatives.
    • The developed QD-based system allows for the detection of thrombin activity through a luminescence-based assay.
    • This approach offers a sensitive and selective method for studying enzyme kinetics and developing biosensors.