Journal
JOURNAL OF BIOMOLECULAR NMR
Volume 51, Issue 3, Pages 245-251Publisher
SPRINGER
DOI: 10.1007/s10858-011-9533-1
Keywords
Methyl; TROSY; Zero-quantum; HZQC; HMQC; RNase H
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Funding
- National Institute of Health [GM50291, GM089047]
- New York State Office of Science, Technology and Academic Research
- National Institute of Health (USA)
- Keck Foundation (New York State)
- NYC Economic Development Corporation
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Multiplet-filtered and gradient-selected heteronuclear zero-quantum coherence (gsHZQC) TROSY experiments are described for measuring H-1-C-13 correlations for (CH3)-C-13 methyl groups in proteins. These experiments provide improved suppression of undesirable, broad outer components of the heteronuclear zero-quantum multiplet in medium-sized proteins, or in flexible sites of larger proteins, compared to previously described HZQC sequences (Tugarinov et al. in J Am Chem Soc 126:4921-4925, 2004; Ollerenshaw et al. in J Biomol NMR 33:25-41, 2005). Hahn-echo versions of the gsHZQC experiment also are described for measuring zero- and double-quantum transverse relaxation rate constants for identification of chemical exchange broadening. Application of the proposed pulse sequences to Escherichia coli ribonuclease HI, with a molecular mass of 18 kD, indicates that improved multiplet suppression is obtained without substantial loss of sensitivity.
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