Conformational studies of hairpin sequences from the ColE1 cruciform.
Inverted repeat sequences derived from the ColE1 cruciform were investigated by nuclear magnetic resonance (NMR) and UV spectroscopy. It was shown that 15 different sequences exist as stable hairpin structures over a range of buffer conditions and DNA concentrations. Experiments with six oligomers (1-6) containing the native stem sequence and five base loops, found that the two hairpins with the wild-type loops (1-2) served as upper and lower bounds for the thermodynamic stability of all the other sequences. NMR experiments, including rotational correlation time measurements and NOESY spectra, were then performed on 1, the most stable hairpin sequence to begin to uncover a structural basis of its stability.
Blatt
N B
NB
Department of Chemistry, University of Michigan, Ann Arbor 48109.
Osborne
S E
SE
Cain
R J
RJ
Glick
G D
GD
D003086:Bacteriocin Plasmids / Q000737:chemistry*; D001482:Base Composition; D001483:Base Sequence; D004269:DNA, Bacterial / Q000737:chemistry*; D004355:Drug Stability; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D012091:Repetitive Sequences, Nucleic Acid; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics
D004269:DNA, Bacterial