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Metal-organic complex-functionalized protein nanopore sensor for aromatic amino acids chiral recognition
Yanli Guo1, Aihua Niu1, Feifei Jian1
1Key Laboratory of Synthetic and Natural Functional Molecular Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China. kangxf@nwu.edu.cn.
The Analyst
|March 11, 2017
Summary
This study presents a novel protein nanopore sensor for single-molecule chiral recognition of aromatic amino acids. The system successfully distinguishes all enantiomers simultaneously, offering a rapid and accurate method for chiral analysis.
Area of Science:
- Nanotechnology
- Biochemistry
- Analytical Chemistry
Background:
- Chiral recognition at the single-molecule level is crucial for biological systems but remains challenging.
- Existing methods for discriminating enantiomers of small molecules often lack speed and simultaneous detection capabilities.
Purpose of the Study:
- To develop a simple and rapid sensing strategy for discriminating all enantiomers of natural aromatic amino acids (AAA) at the single-molecule level.
- To utilize a functionalized protein nanopore system for precise chiral analysis.
Main Methods:
- A protein nanopore, (M113R)7-α-hemolysin (αHL), was functionalized with a heptakis-(6-deoxy-6-amino)-β-cyclodextrin (am7βCD) and copper(II) ion complex.
- The am7βCD-CuII complex acted as a chiral recognition element and a plugging valve within the nanopore.
- Distinct electrical current signals were used to identify individual enantiomers of AAA passing through the pore.
Main Results:
- The developed sensor successfully discriminated between all six natural aromatic amino acid enantiomers simultaneously.
- The copper(II) ion served as a crucial valve, ensuring sufficient interaction time for chiral recognition.
- The system accurately detected enantiomeric excess (ee) for the analyzed AAA mixtures.
Conclusions:
- This metal-organic complex-functionalized protein nanopore offers a powerful new platform for single-molecule chiral sensing.
- The approach demonstrates high efficiency and accuracy in discriminating AAA enantiomers.
- The strategy is potentially generalizable for the chiral recognition of other small molecules.
