Publication details
Sensitive electrochemical determination of unlabeled MutS protein and detection of point mutations in DNA
| Authors | |
|---|---|
| Year of publication | 2004 |
| Type | Article in Periodical |
| Magazine / Source | Analytical Chemistry |
| MU Faculty or unit | |
| Citation | |
| Field | Genetics and molecular biology |
| Keywords | MEDIATED CHARGE-TRANSPORT; MODIFIED ELECTRODES; NUCLEIC-ACIDS; STRIPPING VOLTAMMETRY; BIOACTIVE PEPTIDES; MERCURY-ELECTRODES; CARBON ELECTRODES; MISMATCH REPAIR; SOLID AMALGAMS; HYBRIDIZATION |
| Description | MutS protein plays an important role in the DNA repair system in prokaryotic and eukaryotic cells; it recognizes unpaired and mispaired bases in duplex DNA and can be used for detection of point mutations in vitro. We have shown that small amounts of this protein can be detected electrochemically at mercury and carbon electrodes without any labeling. Using constant current stripping analysis (CPSA) and mercury electrodes, tens of attomoles of this protein can be detected. The sensitivity of the determination at carbon electrodes is by more than 3 orders of magnitude lower. Using biotinylated DNA duplexes attached to magnetic beads, single-base mismatches and insertion/deletions were recognized by MutS. Picogram amounts of this protein were detected by CPSA after MutS releasing from the beads. |