14N魔角极化反转自旋交换(PISEMA)。

14N Polarization Inversion Spin Exchange at Magic Angle (PISEMA).

作者信息

Qian Chunqi, Fu Riqiang, Gor'kov Peter, Brey William W, Cross Timothy A, Gan Zhehong

机构信息

Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA.

出版信息

J Magn Reson. 2009 Jan;196(1):96-9. doi: 10.1016/j.jmr.2008.10.014. Epub 2008 Oct 17.

Abstract

Polarization Inversion Spin Exchange at Magic Angle (PISEMA) is a powerful experiment for determining peptide orientation in uniformly aligned samples such as planar membranes. In this paper, we present (14)N-PISEMA experiment which correlates (14)N quadrupolar coupling and (14)N-(1)H dipolar coupling. (14)N-PISEMA enables the use of (14)N quadrupolar coupling tensor as an ultra sensitive probe for peptide orientation and can be carried out without the need of isotope enrichment. The experiment is based on selective spin-exchange between a proton and a single-quantum transition of (14)N spins. The spin-exchange dynamics is described and the experiment is demonstrated with a natural abundant N-acetyl valine crystal sample.

摘要

魔角极化反转自旋交换(PISEMA)是一种用于确定均匀排列样品(如平面膜)中肽取向的强大实验方法。在本文中,我们展示了(14)N-PISEMA实验,该实验将(14)N四极耦合与(14)N-(1)H偶极耦合相关联。(14)N-PISEMA能够将(14)N四极耦合张量用作肽取向的超灵敏探针,并且无需同位素富集即可进行。该实验基于质子与(14)N自旋的单量子跃迁之间的选择性自旋交换。描述了自旋交换动力学,并用天然丰度的N-乙酰缬氨酸晶体样品演示了该实验。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索