title: 1H NMR studies of lac-operator DNA fragments.
abstract: The hydrogen-bonded imino protons of a 14 base pair double-stranded DNA fragment comprising one half of the lac operator of E. coli were investigated by 360 MHz H NMR. From combined melting studies of this synthetic 14 b.p. fragment and its two constituent 7 b.p. fragments a nearly complete assignment for the low-field proton resonances was obtained. The experimental spectra are compared with calculated spectra and with the spectrum of a 51 b.p. DNA restriction fragment from E. coli containing the complete lac operator. Structural information on these oligonucleotides is presented. This study is a prerequisite for future 1H NMR investigations of the interaction of the lac operator with the lac repressor.
mesh_terms: D004269:DNA, Bacterial; D006860:Hydrogen Bonding; D007763:Lac Operon; D009682:Magnetic Resonance Spectroscopy; D008433:Mathematics; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D009838:Oligodeoxyribonucleotides
chemical_list: D004269:DNA, Bacterial; D009838:Oligodeoxyribonucleotides