Abstract Understanding intrinsic conformational preferences of amino-acids in unfolded proteins is important for elucidating the underlying principles of their stability and re-folding on biological timescales. Here, to investigate the neighbor interaction effects on the conformational propensities of amino-acids, we carried out 1H NMR experiments for a comprehensive set of blocked dipeptides and measured the scalar coupling constants between alpha protons and amide protons as well as their chemical shifts. Detailed inspection of these NMR properties shows that, irrespective of amino-acid side-chain properties, the distributions of the measured coupling constants and chemical shifts of the dipeptides are comparatively narrow, indicating small variances of their conformation distributions. They are further compared with those of blocked amino-acids (Acâ??Xâ??NHMe), oligopeptides (Acâ??GGXGGâ??NH2), and native (lysozyme), denatured (lysozyme and outer membrane protein X from Escherichia coli), unstructured (Domain 2 of the protein 5A of Hepatitis C virus), and intrinsically disordered (hNlg3cyt: intracellular domain of human NL3) proteins. These comparative investigations suggest that the conformational preferences and local solvation environments of the blocked dipeptides are quite similar to not only those of other short oligopeptides but also those of denatured and natively unfolded proteins.
Content Type Journal Article
Category Article
Pages 1-17
DOI 10.1007/s10858-012-9618-5
Authors
Kwang-Im Oh, Department of Chemistry, Korea University, Seoul, 136-701 Korea
Young-Sang Jung, Korea Basic Science Institute, Seoul, 136-713 Korea
Geum-Sook Hwang, Korea Basic Science Institute, Seoul, 136-713 Korea
Minhaeng Cho, Department of Chemistry, Korea University, Seoul, 136-701 Korea
Maximum occurrence analysis of protein conformations for different distributions of paramagnetic metal ions within flexible two-domain proteins
Maximum occurrence analysis of protein conformations for different distributions of paramagnetic metal ions within flexible two-domain proteins
Publication year: 2012
Source:Journal of Magnetic Resonance, Volume 215</br>
Claudio Luchinat, Malini Nagulapalli, Giacomo Parigi, Luca Sgheri</br>
Multidomain proteins are composed of rigid domains connected by (flexible) linkers. Therefore, the domains may experience a large degree of reciprocal reorientation. Pseudocontact shifts and residual dipolar couplings arising from one or more paramagnetic metals successively placed...
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Maximum occurrence analysis of protein conformations for different distributions of paramagnetic metal ions within flexible two-domain proteins
Maximum occurrence analysis of protein conformations for different distributions of paramagnetic metal ions within flexible two-domain proteins
Publication year: 2011
Source: Journal of Magnetic Resonance, Available online 30 December 2011</br>
Claudio*Luchinat, Malini*Nagulapalli, Giacomo*Parigi, Luca*Sgheri</br>
Multidomain proteins are composed of rigid domains connected by (flexible) linkers. Therefore, the domains may experience a large degree of reciprocal reorientation. Pseudocontact shifts and residual dipolar couplings arising from one or more paramagnetic metals successively...
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12-31-2011 10:40 AM
5D 13C-detected experiments for backbone assignment of unstructured proteins with a very low signal dispersion
5D 13C-detected experiments for backbone assignment of unstructured proteins with a very low signal dispersion
Abstract Two novel 5D NMR experiments (CACONCACO, NCOCANCO) for backbone assignment of disordered proteins are presented. The pulse sequences exploit relaxation properties of the unstructured proteins and combine the advantages of 13C-direct detection, non-uniform sampling, and longitudinal relaxation optimization to maximize the achievable resolution and minimize the experimental time. The pulse sequences were successfully tested on the sample of partially disordered delta...
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03-22-2011 07:32 PM
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Authors: Havlin RH, Tycko R
We demonstrate an experimental approach to structural studies of unfolded and partially folded proteins in which conformational distributions are probed at a site-specific level by 2D solid-state 13C NMR spectroscopy of glassy frozen solutions. Experiments on chemical...
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Intrinsically unstructured/disordered proteins (IUPs) exist in a disordered and largely solvent-exposed, still functional, structural state under physiological conditions. As their function is often directly linked with structural disorder,...
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The side-chain conformations have been analyzed in the antimicrobial peptide, Neutrophil Peptide-5 (NP-5), whose structure was independently generated from nmr-derived distance constraints using a distance geometry algorithm. The side-chain and peptide...
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[NMR paper] Side-chain conformations in an unfolded protein: chi1 distributions in denatured hen
Side-chain conformations in an unfolded protein: chi1 distributions in denatured hen lysozyme determined by heteronuclear 13C, 15N NMR spectroscopy.
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Conformational distributions of denatured and unstructured proteins are similar to those of 20 Ã? 20 blocked dipeptides
Linear Mode
