Fig. 1: Fibrillation of biogenic motifs within coacervates.

i Coacervation of PomY protein labelled with mCherry (PomY-mCh) in absence and presence of poly(ethylene glycol) 8 kDa (PEG8000) as crowding agent. LLPS of PomY-mCh coacervates could be triggered at low protein concentration (4 µM) only in presence of PEG8000, while higher protein concentrations (14 µM) did allow the formation of some small coacervates in absence of PEG8000. Reprinted with permission from Springer Nature³⁷. ii Dynamic reshaping of coacervates (green) induced by confined FtsZ fibrillation. Reprinted with permission from Springer Nature⁴². iii Dependence of actin/α-actinin network structure on vesicle size: rings obtained in vesicles of diameter d < 12 µm (A) and fibre mesh formed in vesicles of diameter d > 12 µm (B). Reprinted with permission from American Physical Society⁴⁹. iv Proposed behaviour of actin fibres in response to the size of their droplet container, explaining why actin rings could only be formed in droplets with radii (R) smaller or close to the persistence length of actin filaments (Lp). Reprinted with permission from Springer Nature⁵¹. All scale bars = 5 µm.