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- W4383227966 abstract "ABSTRACT Intrinsically-disordered regions (IDRs) promote intracellular phase separation and the formation of biomolecular condensates through interactions encoded in their primary sequence. While these condensates form spatially distinct assemblies in cells, it is unclear whether such specificity can be conferred by IDRs alone. Indeed, IDRs exhibit high conformational flexibility whereas specificity in protein recognition is generally associated with well-defined 3D structures. To characterize IDR-IDR interactions and assess their ability to mediate self-specific partitioning, we developed a synthetic system of Multivalent IDRs forming Constitutive DROPlets ( micDROP ). We investigated ten natural IDRs that underwent phase separation in micDROP . These IDRs exhibited a wide range of saturation concentrations in vivo , which correlated well with their total sequence stickiness. We then probed IDR-IDR specificity by co-expressing pairs of IDRs fused to homologous scaffolds that did not co-assemble. We observed a high degree of promiscuity, particularly among IDRs from the proteins Ddx4, DYRK3, ERα, FUS, hnRNPA1, HspB8, RBM14 and TAF15, whereas TDP43 and UBQ2 formed spatially distinct condensates regardless of their partner. Further investigation revealed the short and conserved α-helical segment of TDP43’s IDR was governing its specific self-recognition. Our findings imply that IDRs can tune their phase separation propensity through sequence composition, while their formation of discrete condensates likely requires additional cellular or structural determinants. Abstract Figure" @default.
- W4383227966 created "2023-07-06" @default.
- W4383227966 creator A5041977335 @default.
- W4383227966 creator A5092405590 @default.
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- W4383227966 date "2023-07-04" @default.
- W4383227966 modified "2023-10-10" @default.
- W4383227966 title "Mapping interactions between disordered regions reveals promiscuity in biomolecular condensate formation" @default.
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- W4383227966 doi "https://doi.org/10.1101/2023.07.04.547715" @default.
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