Koźmiński Wiktor, Zhukov Igor
Department of Chemistry, Warsaw University, ul. Pasteura 1, 02-093 Warszawa, Poland.
J Magn Reson. 2004 Dec;171(2):338-44. doi: 10.1016/j.jmr.2004.09.013.
The new pulse sequence building block that relies on evolution of heteronuclear multiple quantum coherences is proposed. The particular chemical shifts are obtained in multiple quadrature, using linear combinations of frequencies taken from spectra measured at different quantum levels. The pulse sequences designed in this way consist of small number of RF-pulses, are as short as possible, and could be applied for determination of coupling constants. The examples presented involve 2D correlations HNCO, HNCA, HN(CO)CA, and H(N)COCA via heteronuclear zero and double coherences, as well as 2D HNCOCA technique with simultaneous evolution of triple and three distinct single quantum coherences. Applications of the new sequences are presented for 13C,15N-labeled ubiquitin.
提出了一种基于异核多量子相干演化的新型脉冲序列构建模块。利用在不同量子水平下测量的光谱中获取的频率线性组合,以多正交方式获得特定的化学位移。以这种方式设计的脉冲序列由少量射频脉冲组成,尽可能短,可用于确定耦合常数。给出的示例包括通过异核零相干和双相干的二维相关HNCO、HNCA、HN(CO)CA和H(N)COCA,以及具有三重和三个不同单量子相干同时演化的二维HNCOCA技术。展示了新序列在13C、15N标记的泛素上的应用。