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Trimethylamine N-oxide abolishes the chaperone activity of α-casein: an intrinsically disordered protein.

Trimethylamine N-oxide abolishes the chaperone activity of α-casein: an intrinsically disordered protein.
Author Information (click to view)

Bhat MY, Singh LR, Dar TA,


Bhat MY, Singh LR, Dar TA, (click to view)

Bhat MY, Singh LR, Dar TA,

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Scientific reports 2017 07 267(1) 6572 doi 10.1038/s41598-017-06836-2
Abstract

Osmolytes (small molecules that help in circumventing stresses) are known to promote protein folding and prevent aggregation in the case of globular proteins. However, the effect of such osmolytes on the structure and function of intrinsically disordered proteins (IDPs) has not been clearly understood. Here we have investigated the effect of methylamine osmolytes on α-casein (an IDP present in mammalian milk) and discovered that TMAO (Trimethylamine-N-oxide) but not other methylamines renders α-casein functionless. We observed that the loss of chaperone activity of α-casein in presence of TMAO was due to the induction of an unstable aggregation-prone intermediate. The results indicate that different osmolytes may have different structural and functional consequences on IDPs, and therefore might have clinical implications for a large number of human diseases (e.g., amyloidosis, cancer, diabetes, and neurodegeneration) where IDPs are involved.

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