Abstract
The marginal stability of globular proteins in the cell is determined by the balance between excluded volume effect and soft interactions. Quinary interactions are a type of soft interactions involved in intracellular organisation and known to have stabilising or destabilising effects on globular proteins. Recent studies suggest that globular proteins have structural flexibility, exhibiting more than one functional state. Here, we propose that the quinary-induced destabilisation can be sufficient to produce functional partially unfolded states of globular proteins. The biological relevance of this mechanism is explored, involving intracellular phase separation and regulatory stress response mechanisms.
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