Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Global hairpin folding of tau in solution
Autor Jeganathan, S.; von Bergen, M.; Brutlach, H.; Steinhoff, H.J.; Mandelkow, E.;
Journal / Serie Biochemistry
Erscheinungsjahr 2006
Department PROTEOM;
Band/Volume 45
Heft 7
Sprache englisch;
Abstract The microtubule-associated protein tau stabilizes microtubules in its physiological role, whereas it forms insoluble aggregates (paired helical filaments) in Alzheimer's disease. Soluble tau is considered a natively unfolded protein whose residual folding and intramolecular interactions are largely undetermined. In this study, we have applied fluorescence resonance energy transfer (FRET) and electron paramagnetic resonance (EPR) to examine the proximity and flexibility of tau domains and the global folding. FRET pairs spanning the tau molecule were created by inserting tryptophans (donor) and cysteines (labeled with IAEDANS as an acceptor) by site-directed mutagenesis. The observed FRET distances were significantly different from those expected for a random coil. Notably, the C-terminal end of tau folds over into the vicinity of the microtubule-binding repeat domain, the N-terminus remains outside the FRET distance of the repeat domain, yet both ends of the molecule approach one another. The interactions between the domains were obliterated by denaturation in GdnHCl. Paramagnetic spin-labels attached in various domains of tau were analyzed by EPR and exhibited a high mobility throughout. The data indicate that tau retains some global folding even in its "natively unfolded" state, combined with the high flexibility of the chain.
ID 2742
dauerhafte UFZ-Verlinkung
Jeganathan, S., von Bergen, M., Brutlach, H., Steinhoff, H.J., Mandelkow, E. (2006):
Global hairpin folding of tau in solution
Biochemistry 45 (7), 2283 - 2293