TALAGA, David; SMERALDA, Willy; LESCOS, Laurie; HUNEL, Julien; LEPEJOVA-CAUDY, Nad'a; CULLIN, Christophe; BONHOMMEAU, Sebastien; LECOMTE, Sophie

doi:10.1002/anie.201809636

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TALAGA, David
Institut des Sciences Moléculaires [ISM]

SMERALDA, Willy
Chimie et Biologie des Membranes et des Nanoobjets [CBMN]

LESCOS, Laurie

Institut des Sciences Moléculaires [ISM]

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Angewandte Chemie (International ed. in English). 2018, vol. 57, n° 48, p. 15738-15742

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The morphology and secondary structure of peptide fibers formed by aggregation of tubulin-associated unit (Tau) fragments (K18), in the presence of the inner cytoplasmic membrane phosphatidylinositol component (PIP2 ) or heparin sodium (HS) as cofactors, are determined with nanoscale (<10 nm) spatial resolution. By means of tip-enhanced Raman spectroscopy (TERS), the inclusion of PIP2 lipids in fibers is determined based on the observation of specific C=O ester vibration modes. Moreover, analysis of amide I and amide III bands suggests that the parallel beta-sheet secondary structure content is lower and the random coil content is higher for fibers grown from the PIP2 cofactor instead of HS. These observations highlight the occurrence of some local structural differences between these fibers. This study constitutes the first nanoscale structural characterization of Tau/phospholipid aggregates, which are implicated in deleterious mechanisms on neural membranes in Alzheimer's disease.< Réduire

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PIP2 Phospholipid-Induced Aggregation of Tau Filaments Probed by Tip-Enhanced Raman Spectroscopy

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