Double TEDOR for the direct detection of stable-isotope triads

被引:6
作者
Klug, CA
Schaefer, J
机构
[1] Department of Chemistry, Washington University, St. Louis
来源
JOURNAL OF MAGNETIC RESONANCE SERIES B | 1996年 / 110卷 / 02期
关键词
D O I
10.1006/jmrb.1996.0027
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
An extension of transferred-echo double-resonance (TEDOR) NMR is presented for the detection of three coupled spin-1/2 nuclei: I-1-S-I-2, where I-1 and I-2 are a homonuclear pair with an isotropic chemical-shift difference, By performing two coherence transfers (in combination with a DANTE preparation sequence)? it is possible to monitor coherence transferred sequentially from I-1 to S to I-2 (or the reverse), Initial experiments demonstrating the feasibility of this approach were performed on both mixed and recrystallized C-13- and N-15-labeled alanines, and the results are found to be in good agreement with predictions based on a density matrix formalism. This technique has also been applied to characterize the covalent cross-linking of the bacterial cell wall of a triple-labeled Bacillus subtilis by demonstrating the connectivity of C-13-N-15-C-13 triads, These triads occur only in the cross-link bond. (C) 1996 Academic Press. Inc.
引用
收藏
页码:176 / 181
页数:6
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