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Triple resonance NMR relaxation experiments for studies of intrinsically disordered proteins

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SRB Pavel NOVÁČEK Jiří KADEŘÁVEK Pavel RABATINOVA A. KRÁSNÝ L. ŽÍDKOVÁ J. BOBÁĽOVÁ J. SKLENÁŘ Vladimír ŽÍDEK Lukáš

Rok publikování 2017
Druh Článek v odborném periodiku
Časopis / Zdroj Journal of Biomolecular NMR
Fakulta / Pracoviště MU

Středoevropský technologický institut

Citace
www https://link.springer.com/article/10.1007%2Fs10858-017-0138-1
Doi http://dx.doi.org/10.1007/s10858-017-0138-1
Klíčová slova Nuclear magnetic resonance; Relaxation; Non-uniform sampling; Intrinsically disordered proteins
Popis Description of protein dynamics is known to be essential in understanding their function. Studies based on a well established NMR relaxation methodology have been applied to a large number of systems. However, the low dispersion of chemical shifts very often observed within intrinsically disordered proteins complicates utilization of standard 2D HN correlated spectra because a limited number of amino acids can be characterized. Here we present a suite of triple resonance HNCO-type NMR experiments for measurements of five relaxation parameters (, , NOE, cross-correlated relaxation rates and ) in doubly ,-labeled proteins. We show that the third spectral dimension combined with non-uniform sampling provides relaxation rates for almost all residues of a protein with extremely poor chemical shift dispersion, the C terminal domain of -subunit of RNA polymerase from Bacillus subtilis. Comparison with data obtained using a sample labeled by only showed that the presence of has a negligible effect on , , and on the cross-relaxation rate (calculated from NOE and ), and that these relaxation rates can be used to calculate accurate spectral density values. Partially -labeled sample was used to test if the observed increase of in the presence of corresponds to the dipole-dipole interactions in the ,-labeled sample.
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