A MutS protein-immobilized Au electrode for detecting single-base mismatch of DNA

Aishan Han, Tohru Takarada, Taiki Shibata, Masamichi Nakayama, Mizuo Maeda

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


A novel electrochemical biosensor was developed to detect gene mutation by using a DNA-mismatch binding protein: MutS from Escherichia coli. The MutS protein was immobilized onto an Au-electrode surface via complex formation between a histidine tag of the MutS protein and a thiol-modified nitrilotriacetic acid chemically adsorbed on the Au-electrode surface. When a target double-stranded DNA having a single-base mismatch was captured by the MutS protein on the electrode, some electrostatic repulsion arose between polyanionic DNA strands and anionic redox couple ions. Consequently, their redox peak currents on a cyclic voltammogram with the Au electrode drastically decreased, depending on the concentration of the target DNA, according to the redox couple-mediated artificial ion-channel principle. By using this assay, one can detect all types of single-base mismatch and single-base deletion. 2006

Original languageEnglish
Pages (from-to)663-666
Number of pages4
Journalanalytical sciences
Issue number5
Publication statusPublished - May 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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