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Deciphering how naturally occurring sequence features impact the phase behaviours of disordered prion-like domains
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Deciphering how naturally occurring sequence features impact the phase behaviours of disordered prion-like domains
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Journal Article
Deciphering how naturally occurring sequence features impact the phase behaviours of disordered prion-like domains
2022
Overview
Prion-like low-complexity domains (PLCDs) have distinctive sequence grammars that determine their driving forces for phase separation. Here we uncover the physicochemical underpinnings of how evolutionarily conserved compositional biases influence the phase behaviour of PLCDs. We interpret our results in the context of the stickers-and-spacers model for the phase separation of associative polymers. We find that tyrosine is a stronger sticker than phenylalanine, whereas arginine is a context-dependent auxiliary sticker. In contrast, lysine weakens sticker–sticker interactions. Increasing the net charge per residue destabilizes phase separation while also weakening the strong coupling between single-chain contraction in dilute phases and multichain interactions that give rise to phase separation. Finally, glycine and serine residues act as non-equivalent spacers, and thus make the glycine versus serine contents an important determinant of the driving forces for phase separation. The totality of our results leads to a set of rules that enable comparative estimates of composition-specific driving forces for PLCD phase separation.
The complex link between protein sequence and phase behaviour for a family of prion-like low-complexity domains (PLCDs) has now been revealed. The results have uncovered a set of rules—which are interpreted using a stickers-and-spacers model—that govern the sequence-encoded phase behaviour of such PLCDs and enable physicochemical rationalizations that are connected to the underlying sequence composition.
