Differential multiple quantum relaxation caused by chemical exchange outside the fast exchange limit

被引：26

作者：

Wang, CY ^{[1
]}

Palmer, AG ^{[1
]}

机构：

[1] Columbia Univ, Dept Biochem & Mol Biophys, New York, NY 10032 USA

来源：

JOURNAL OF BIOMOLECULAR NMR | 2002年 / 24卷 / 03期

关键词：

BPTI; chemical exchange; dynamics; multiple quantum coherence; relaxation;

D O I：

10.1023/A:1021687604854

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Differential relaxation of multiple quantum coherences is a signature for chemical exchange processes in proteins. Previous analyses of experimental data have used theoretical descriptions applicable only in the limit of fast exchange. Theoretical expressions for differential relaxation rate constants that are accurate outside fast exchange are presented for two-spin-system subject to two-site chemical exchange. The theoretical expressions are validated using experimental results for N-15-H-1 relaxation in basic pancreatic trypsin inhibitor. The new theoretical expression is valuable for identification and characterization of exchange processes in proteins using differential relaxation of multiple quantum coherences.

引用

页码：263 / 268

页数：6

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