期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 29, 页码 11504-11509出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1201669109
关键词
alpha-hemolysin; crown ethers; single-molecule detection; DNA damage
资金
- NIH [GM093099, HG005095]
DNA abasic (AP) sites are one of the most frequent lesions in the genome and have a high mutagenic potential if unrepaired. After selective attachment of 2-aminomethyl-18-crown-6 (18c6), individual AP lesions are detected during electrophoretic translocation through the bacterial protein ion channel alpha-hemolysin (alpha-HL) embedded in a lipid bilayer. Interactions between 18c6 and Na+ produce characteristic pulse-like current amplitude signatures that allow the identification of individual AP sites in single molecules of homopolymeric or heteropolymeric DNA sequences. The bulky 18c6-cation complexes also dramatically slow the DNA motion to more easily recordable levels. Further, the behaviors of the AP-18c6 adduct are different with respect to the directionalities of DNA entering the protein channel, and they can be precisely manipulated by altering the cation (Li+, Na+ or K+) of the electrolyte. This method permits detection of multiple AP lesions per strand, which is unprecedented in other work. Additionally, insights into the thermodynamics and kinetics of 18c6-cation interactions at a single-molecule level are provided by the nanopore measurement.
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