amyloidprone

Amyloidprone (often written amyloid-prone) refers to sequences or regions within proteins that have a high propensity to form amyloid fibrils. Such regions—often called amyloid-prone regions or APRs—can drive aggregation under physiological or stress conditions and are implicated in a range of neurodegenerative and systemic amyloid diseases, but also participate in functional amyloid systems in some organisms.

APR characteristics include relatively high hydrophobicity, specific amino acid composition (e.g., glutamine, asparagine, and aromatic residues), and a propensity to adopt extended beta-sheet structures. The context within the protein, such as neighboring residues and overall stability, modulates whether an APR aggregates.

Detecting amyloid-prone segments employs experimental assays and computational predictors. In vitro, amyloid formation is commonly monitored with Thioflavin T fluorescence or electron microscopy. Computational tools such as aggregation propensity predictors scan sequences to identify APRs, guiding studies of misfolding and protein design.

Biological implications: APRs contribute to disease-related aggregation in several conditions, including Alzheimer's disease, prion diseases, and systemic amyloidoses. Conversely, some organisms use amyloid formation functionally, for example in biofilm matrices or regulated secretion. Therapeutically, strategies aim to block APR aggregation, stabilize native structure, or enhance cellular proteostasis.

See also: Amyloid, Alzheimer’s disease, Prion protein, Protein misfolding, Amyloid precursor protein, Functional amyloid.