Abstract
Intrinsically disordered proteins carry out many important functions in the cell. However, the lack of an ordered structure causes dramatic signal overlap and complicates the NMR-based characterization of their structure and dynamics. Here we demonstrate that the resonance assignment of 441-residue Tau and its smaller isoforms, htau24 (383 residues) and htau23 (352 residues), three prototypes of intrinsically disordered proteins, which bind to microtubules and play a key role in Alzheimer disease, can be obtained within 5 days by a combination of seven-dimensional NMR spectra with optimized methods for automatic assignment. Chemical shift differences between the three isoforms provide evidence for the global folding of Tau in solution.
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