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Enzyme-amplified electronic logic gates based on split/intact aptamers.

Junhua Chen1, Lingwen Zeng

  • 1Key Laboratory of Regenerative Biology, South China Institute for Stem Cell Biology and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China.

Biosensors & Bioelectronics
|December 4, 2012
PubMed
Summary

Researchers developed enzyme-amplified electronic logic gates for simultaneous sensing of small molecules and proteins. This adaptable platform uses aptamers for molecular recognition, enabling sensitive and reversible detection in biological samples.

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Area of Science:

  • Biotechnology
  • Molecular Engineering
  • Biosensors

Background:

  • Molecular logic gates are crucial for complex biological sensing.
  • Existing systems often lack simultaneous detection capabilities or require complex designs.
  • Aptamers offer specific molecular recognition for various analytes.

Purpose of the Study:

  • To construct enzyme-amplified electronic logic gates (OR, AND, NOR, NAND) for simultaneous sensing.
  • To develop a universal molecular-level system based on aptamer interactions.
  • To demonstrate the platform's robustness and expandability for diverse analyte detection.

Main Methods:

  • Utilized target-induced self-assembly of split aptamer fragments or conformational changes of intact aptamers.
  • Employed split aptamers for OR/AND gates and intact aptamers for NOR/NAND gates.
  • Integrated biotin and SA-HR reporter system for amplified current signal generation.

Main Results:

  • Successfully constructed functional electronic logic gates (OR, AND, NOR, NAND) at the molecular level.
  • Demonstrated simultaneous detection of adenosine triphosphate (ATP) and thrombin.
  • Achieved robust performance in human serum samples with high selectivity.
  • Confirmed the reversibility of logic gates, enabling set-reset functions.

Conclusions:

  • Developed a "smart" and flexible aptamer-based logic platform for multiplexed sensing.
  • The system exhibits excellent selectivity and robustness, suitable for biological samples.
  • The platform is expandable for detecting other small molecules like AMP, theophylline, and cocaine.