Energetics of base flipping at a DNA mismatch site confined at the latch constriction of ?-hemolysin.

ABSTRACT: Unique, two-state modulating current signatures are observed when a cytosine-cytosine mismatch pair is confined at the 2.4 nm latch constriction of the ?-hemolysin (?HL) nanopore. We have previously speculated that the modulation is due to base flipping at the mismatch site. Base flipping is a biologically significant mechanism in which a single base is rotated out of the DNA helical stack by 180°. It is the mechanism by which enzymes are able to access bases for repair operations without disturbing the global structure of the helix. Here, temperature dependent ion channel recordings of individual double-stranded DNA duplexes inside ?HL are used to derive thermodynamic (?H, ?S) and kinetic (EA) parameters for base flipping of a cytosine at an unstable cytosine-cytosine mismatch site. The measured activation energy for flipping a cytosine located at the latch of ?HL out of the helix (18 ± 1 kcal mol-1) is comparable to that previously reported for base flipping at mismatch sites from NMR measurements and potential mean force calculations. We propose that the ?HL nanopore is a useful tool for measuring conformational changes in dsDNA at the single molecule level.

SUBMITTER: Johnson RP 

PROVIDER: S-EPMC5145759 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature