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^(15)N-^1H Residual Dipolar Coupling Analysis of Native and Alkaline-K79A Saccharomyces cerevisiae Cytochrome c

Assfalg, Michael and Bertini, Ivano and Turano, Paola and Mauk, A. Grant and Winkler, Jay R. and Gray, Harry B. (2003) ^(15)N-^1H Residual Dipolar Coupling Analysis of Native and Alkaline-K79A Saccharomyces cerevisiae Cytochrome c. Biophysical Journal, 84 (6). pp. 3917-3923. ISSN 0006-3495. PMCID PMC1302973. doi:10.1016/S0006-3495(03)75119-4.

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Residual dipolar couplings (RDCs) and pseudocontact shifts are experimentally accessible properties in nuclear magnetic resonance that are related to structural parameters and to the magnetic susceptibility anisotropy. We have determined RDCs due to field-induced orientation of oxidized-K79A and reduced cytochrome c at pH 7.0 and oxidized-K79A cytochrome c at pH 11.1 through measurements of amide ^(15)N-^1H ^1J couplings at 800 and 500 MHz. The pH 7.0 RDCs for Fe(III)- and Fe(II)-cytochrome c together with available nuclear Overhauser effects were used to recalculate solution structures that were consistent with both sets of constraints. Molecular magnetic susceptibility anisotropy values were calculated for both redox states of the protein. By subtracting the residual dipolar couplings (RDCs) of the reduced form from those of the oxidized form measured at the same magnetic field (800 MHz), we found the RDC contribution of the paramagnetic metal ion in the oxidized protein. The magnetic susceptibility anisotropy, which was calculated from the structure, was found to be the same as that of the paramagnetic metal ion obtained independently from pseudocontact shifts, thereby indicating that the elements of secondary structure either are rigid or display the same mobility in both oxidation states. The residual dipolar coupling values of the alkaline-K79A form are small with respect to those of oxidized native cytochrome, whereas the pseudocontact shifts are essentially of the same magnitude, indicating local mobility. Importantly, this is the first time that mobility has been found through comparison of RDCs with pseudocontact shifts.

Item Type:Article
Related URLs:
URLURL TypeDescription CentralArticle
Assfalg, Michael0000-0001-9331-3169
Turano, Paola0000-0002-7683-8614
Winkler, Jay R.0000-0002-4453-9716
Gray, Harry B.0000-0002-7937-7876
Additional Information:© 2003 The Biophysical Society. Published by Elsevier Inc. Received 27 September 2002, Accepted 21 January 2003. We thank Federico Rosell for providing samples of K79A cytochrome c. We acknowledge support from the Ministero dell’Istruzione, dell’Università e della Ricerca, Cofinanziamento 2001 MIUR COFIN2001) and European Community Network (grant FMRX-CT98-0218 to I.B.); Italian Consiglio Nazionale delle Richerche (Progetto Finalizzato Biotecnologie grant 01.00359.PF49 to P.T.); operating grant MT-14021 from the Canadian Institutes of Health Research and a Canada Research Chair (to A.G.M.); United States National Institutes of Health grant DK19038 (to H.B.G.); and Department of Energy grant DE-FG03-02ER15359 (to J.R.W.).
Funding AgencyGrant Number
Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR)2001 MIUR COFIN2001
European CommunityFMRX-CT98-0218
Consiglio Nazionale delle Ricerche (CNR)01.00359.PF49
Canadian Institutes of Health ResearchMT-14021
Canada Research Chairs ProgramUNSPECIFIED
Department of Energy (DOE)DE-FG03-02ER15359
Issue or Number:6
PubMed Central ID:PMC1302973
Record Number:CaltechAUTHORS:20170530-161349767
Persistent URL:
Official Citation:Michael Assfalg, Ivano Bertini, Paola Turano, A. Grant Mauk, Jay R. Winkler, Harry B. Gray, 15N-1H Residual Dipolar Coupling Analysis of Native and Alkaline-K79A Saccharomyces cerevisiae Cytochrome c, Biophysical Journal, Volume 84, Issue 6, June 2003, Pages 3917-3923, ISSN 0006-3495, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77840
Deposited By: Tony Diaz
Deposited On:31 May 2017 18:59
Last Modified:15 Nov 2021 17:34

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