Improved HSQC experiments for the observation of exchange broadened signals |
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Authors: | Frans A. A. Mulder Chris A. E. M. Spronk Monique Slijper Robert Kaptein Rolf Boelens |
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Affiliation: | (1) Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands |
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Abstract: | Summary We present here HSQC experiments with improved sensitivity for signals in the presence of exchange broadening. During periods of coherence transfer through scalar coupling the experiments employ CPMG-derived pulse trains to reduce loss of dephasing of spin coherence due to chemical exchange. 15N–1H gradient CPMG-HSQC and SE-CPMG-HSQC experiments have been developed and applied to complexes of lac repressor headpiece with operator DNA. Improved sensitivity is demonstrated for many protein backbone and side-chain resonances in the complex, markedly for signals of protons located at the protein-DNA interface. In addition, a significant increase in intensity is observed for arginine guanidino groups undergoing conformational exchange. |
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Keywords: | Chemical exchange CPMG Protein-DNA interactions lac repressor |
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