New methylene specific experiments for the measurement of scalar spin-spin coupling constants between protons attached to 13C

被引：7

作者：

Carlomagno, T

Schwalbe, H

Rexroth, A

Sorensen, OW

Griesinger, C

机构：

[1] Univ Frankfurt, Inst Organ Chem, D-60439 Frankfurt, Germany

[2] Carlsberg Lab, Dept Chem, DK-2500 Valby, Denmark

来源：

JOURNAL OF MAGNETIC RESONANCE | 1998年 / 135卷 / 01期

关键词：

E-COSY; DQ/ZQ-HCCH-E-COSY; multiple quantum spectroscopy; vicinal proton coupling constant; data simulation; auto-correlated and cross-correlated relaxation;

D O I：

10.1006/jmre.1998.1545

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

New two- and three-dimensional NMR methods are proposed for the measurement of (3)J(H, H) coupling constants between two adjacent methylene moieties. The new experiment, which is based on a combination of the E.COSY principle and double/zero quantum heteronuclear spectroscopy, has been applied to diaceton-glucose and to the protein rhodniin. The coupling constants of CH-CH, groups have been compared with those obtained from a HCCH-E.COSY experiment to check the reliability of the results. An analysis of the coupling constants derived by comparison between experimental and simulated spectra is presented. Simulations were done with the program wtest considering fully correlated dipolar relaxation. Side-chain conformations in amino acids with adjacent methylene groups can be determined by the new experiment. (C) 1998 Academic Press.

引用

页码：216 / 226

页数：11