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© Research
Publication : Journal of magnetic resonance (San Diego, Calif. : 1997)

Simple and accurate determination of global tau(R) in proteins using (13)C or (15)N relaxation data

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of magnetic resonance (San Diego, Calif. : 1997) - 01 Mar 2000

Mispelter J, Izadi-Pruneyre N, Quiniou E, Adjadj E

Link to Pubmed [PMID] – 10698665

J. Magn. Reson. 2000 Mar;143(1):229-32

In the study of protein dynamics by (13)C or (15)N relaxation measurements different models from the Lipari-Szabo formalism are used in order to determine the motion parameters. The global rotational correlation time tau(R) of the molecule must be estimated prior to the analysis. In this Communication, the authors propose a new approach in determining an accurate value for tau(R) in order to realize the best fit of R(2) for the whole sequence of the protein, regardless of the different type of motions atoms may experience. The method first determines the highly structured regions of the sequence. For each corresponding site, the Lipari-Szabo parameters are calculated for R(1) and NOE, using an arbitrary value for tau(R). The chi(2) for R(2), summed over the selected sites, shows a clear minimum, as a function of tau(R). This minimum is used to better estimate a proper value for tau(R).

http://www.ncbi.nlm.nih.gov/pubmed/10698665