Size distributions of intracellular condensates reflect competition between coalescence and nucleation

Daniel S.W. Lee, Chang Hyun Choi, David W. Sanders, Lien Beckers, Joshua A. Riback, Clifford P. Brangwynne, Ned S. Wingreen

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Phase separation of biomolecules into condensates has emerged as a mechanism for intracellular organization and affects many intracellular processes, including reaction pathways through the clustering of enzymes and pathway intermediates. Precise and rapid spatiotemporal control of reactions by condensates requires tuning of their sizes. However, the physical processes that govern the distribution of condensate sizes remain unclear. Here we show that both native and synthetic condensates display an exponential size distribution, which is captured by Monte Carlo simulations of fast nucleation followed by coalescence. In contrast, pathological aggregates exhibit a power-law size distribution. These distinct behaviours reflect the relative importance of nucleation and coalescence kinetics. We demonstrate this by utilizing a combination of synthetic and native condensates to probe the underlying physical mechanisms determining condensate size. The appearance of exponential distributions for abrupt nucleation versus power-law distributions under continuous nucleation may reflect a general principle that determines condensate size distributions.

Original languageEnglish (US)
Pages (from-to)586-596
Number of pages11
JournalNature Physics
Volume19
Issue number4
DOIs
StatePublished - Apr 2023

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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