Determination of the effective correlation time modulating 1H NMR relaxation processes of bound water in protein solutions

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dc.contributor.authorYilmaz, Ali
dc.contributor.authorBudak, Hatice
dc.contributor.authorUlak, F. Sadan
dc.date.accessioned2024-04-24T16:15:39Z
dc.date.available2024-04-24T16:15:39Z
dc.date.issued2008
dc.departmentDicle Üniversitesien_US
dc.description.abstractThe relaxation in protein solutions has mainly been studied by nuclear magnetic relaxation dispersion (NMRD) techniques. NMRD data have mostly been analyzed in terms of fast chemical exchange of water between free water and water bound to proteins. Several approaches were used for the estimation of correlation time modulating the relaxation mechanism of bound water. On the other hand, in a nuclear magnetic resonance experiment, the relaxation rates of protein solutions (1/T-1 and 1/T-2) and also those of free water (1/T-1f and 1/T-2f) are measurable. However, the relaxation rates of bound water (1/T-1b and 1/T-2b) are not. Despite this, equating (1/T-1-1/T-1f)/2(1/T-2-1/T-2f) to (1/T-1b)/2(1/T-2b) leads to an expression involving only an effective T that is related to the rotational correlation time (tau(r)) of proteins. Equating the ratios may therefore give a simple alternative method for the determination of tau(r) even if this method is limited to a single resonance frequency. In this work, a formula was derived for the solution of the effective tau. Then, the 1/T-1 and 1/T-2 in solutions of two globular proteins (lysozyme and albumin) and one nonglobular protein (gamma-globulin) were measured for different amounts of each protein. Next, the values of 1/T-1 and 1/T-2 were plotted vs. protein concentrations, and then the slopes of the fits were used in the derived equation for determining the effective tau values. Finally, the rotational correlation time tau(r), calculated from tau, was used in the Stokes-Einstein relation to reproduce relevant radii. The effective tau values of lysozyme, albumin and gamma-globulin were found to be 5.89 ns, 7.03 ns and 8.8 its, respectively. tau(r) values of albumin and lysozyme produce their Stokes radii. The present data suggest that use of the measurable ratio in the derived formula may give a simple way for the determination of the correlation times of lysozyme and albumin. (C) 2008 Elsevier Inc. All rights reserved.en_US
dc.identifier.doi10.1016/j.mri.2007.05.008
dc.identifier.endpage260en_US
dc.identifier.issn0730-725X
dc.identifier.issn1873-5894
dc.identifier.issue2en_US
dc.identifier.pmid17683891
dc.identifier.scopus2-s2.0-38349153223
dc.identifier.scopusqualityQ2
dc.identifier.startpage254en_US
dc.identifier.urihttps://doi.org/10.1016/j.mri.2007.05.008
dc.identifier.urihttps://hdl.handle.net/11468/15880
dc.identifier.volume26en_US
dc.identifier.wosWOS:000253225700013
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoenen_US
dc.publisherElsevier Science Incen_US
dc.relation.ispartofMagnetic Resonance Imaging
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectNmren_US
dc.subjectH-1en_US
dc.subjectRelaxation Ratesen_US
dc.subjectCorrelation Timeen_US
dc.subjectProtein Solutionsen_US
dc.subjectAlbuminen_US
dc.subjectLysozyme And Gamma-Globulinen_US
dc.titleDetermination of the effective correlation time modulating 1H NMR relaxation processes of bound water in protein solutionsen_US
dc.titleDetermination of the effective correlation time modulating 1H NMR relaxation processes of bound water in protein solutions
dc.typeArticleen_US

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