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Speeding up sequence specific assignment of IDPs

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Abstract

The characterization of intrinsically disordered proteins (IDPs) by NMR spectroscopy is made difficult by the extensive spectral overlaps. To overcome the intrinsic low-resolution of the spectra the introduction of high-dimensionality experiments is essential. We present here a set of high-resolution experiments based on direct 13C-detection which proved useful in the assignment of α-synuclein, a paradigmatic IDP. In particular, we describe the implementation of 4D HCBCACON, HCCCON, HCBCANCO, 4/5D HNCACON and HNCANCO and 3/4D HCANCACO experiments, specifically tailored for spin system identification and backbone resonances sequential assignment. The use of non-uniform-sampling in the indirect dimension and of the H-flip approach to achieve longitudinal relaxation enhancement rendered the experiments very practical.

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Acknowledgments

This work has been supported in part by the EC 7th Framework program BioNMR, contract 261863 and by the EC Marie Curie ITN program (IDPbyNMR, contract 264257).

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Correspondence to Ivano Bertini.

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Bermel, W., Bertini, I., Felli, I.C. et al. Speeding up sequence specific assignment of IDPs. J Biomol NMR 53, 293–301 (2012). https://doi.org/10.1007/s10858-012-9639-0

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