Abstract
Many protein–protein interactions involve amino acid sequences containing proline-rich motifs and even poly-proline stretches. The lack of amide protons in such regions complicates assignment, since 1HN-based triple-resonance assignment strategies cannot be employed. Two such systems that we are currently studying include an SH2 domain from the protein Crk with a region containing 9 prolines in a 14 amino acid sequence, as well as a WW domain that interacts with a proline-rich target. A modified version of the HACAN pulse scheme, originally described by Bax and co-workers [Wang et al. (1995) J. Biomol. NMR, 5, 376–382], and an experiment which correlates the intra-residue 1Hα, 13Cα/13Cβ chemical shifts with the 15N shift of the subsequent residue are presented and applied to the two systems listed above, allowing sequential assignment of the molecules.
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Kanelis, V., Donaldson, L., Muhandiram, D. et al. Sequential assignment of proline-rich regions in proteins: Application to modular binding domain complexes. J Biomol NMR 16, 253–259 (2000). https://doi.org/10.1023/A:1008355012528
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DOI: https://doi.org/10.1023/A:1008355012528