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- W2042657733 abstract "Short polyserine (polyS) repeats are frequently found in proteins and longer ones are produced in neurological disorders such as Huntington disease (HD) owing to translational frameshifting or non-ATG-dependent translation, together with polyglutamine (polyQ) and polyalanine (polyA) repeats, forming intracellular aggregates. However, the physiological and pathological structures of polyS repeats are not clearly understood. Early studies highlighted their structural versatility, similar to other homopolymers whose conformation is influenced by the surrounding protein context. As polyS stretches are frequently near polyQ and polyA repeats, which can be part of coiled coil (CC) structures, and the frameshift-derived polyS repeats in HD directly flank CC heptads important for aggregation, we investigate here the structural and aggregation properties of polyS in the context of CC structures. We have taken advantage of peptide models, previously used to study polyQ and polyA in CCs, in which we inserted polyS repeats of variable length and studied them in comparison with polyQ and polyA peptides. We found that polyS repeats promote CC-mediated polymerization and fibrillization as revealed by circular dichroism, chemical crosslinking, and atomic force microscopy. Furthermore, they promote CC-based, length-dependent intracellular aggregation, which is negligible with 7 and widespread with 49 serines. These findings show that polyS repeats can participate in the formation of CCs, as previously found for polyQ and polyA, conferring to peptides distinctive structural properties with aggregation kinetics that are intermediate between those of polyA and polyQ CCs, and contribute to an overall structural definition of the pathophysiogical roles of homopolymeric repeats in CC structures." @default.
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- W2042657733 date "1966-04-01" @default.
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- W2042657733 title "The optical rotatory dispersion of the β structure of poly-l-lysine and poly-l-serine" @default.
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- W2042657733 doi "https://doi.org/10.1016/0006-291x(66)90521-3" @default.
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