期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 117, 期 20, 页码 6227-6230出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp4037149
关键词
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资金
- National Science Foundation [MCB 1157712]
- NIH MERIT [5R37-GM02907]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1157712] Funding Source: National Science Foundation
Double quantum coherence (DQC) ESR spectroscopy is applied to measure the Cu2+-Cu2+ distance in the EcoRI-DNA complex. A simple method is proposed to reduce the contribution of nuclear hyperfine and quadrupole interactions to such data. The effects of such interactions between the electron spin of Cu2+ and neighboring nuclei on the DQC data make it difficult to measure the nanometer range interspin distance. The DQC data is in good agreement with results obtained by double electron electron resonance (DEER) spectroscopy. At the same time, the signal-to-noise ratio per shot in DQC is high. Taken together, these results provide impetus for further development of paramagnetic metal ion-based DQC techniques.
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