Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 172, Issue 1, Pages 85-90Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2004.03.012
Keywords
NMR; J-resolved spectra; order tensors; alignment media; rubredoxin
Funding
- NIGMS NIH HHS [GM033225, R37 GM033225-21] Funding Source: Medline
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM033225, R37GM033225] Funding Source: NIH RePORTER
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A quick and accurate method is described for assessing protein alignment from residual dipolar coupling (RDC) measurements In contrast to observing D2O resonance splitting which reflects the orientational order of the alignment medium, the degree of alignment of a protein of interest can be estimated directly from H-1-H-1 RDCs. In this study, RDCs between aromatic protons in unlabeled Cp-rubredoxin were measured front proton homonuclear J-resolved experiments with high sensitivity. and the alignment was assessed without the need of extensive resonance assignment. Since labeled proteins are not needed, this method provides an efficient way for screening alignment media. In situations where the protein structure is known. as in the case of Cp-rubredoxin, a full of order tensor parameters can be determined, allowing further studies, such as those of ligand alignment relative to a target protein. (C) 2004 Elsevier Inc. All rights reserved.
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