ArticlebioRxiv : the preprint server for biology2025
Nanometer condensate organization in live cells derived from partitioning measurements.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
7 authors.
Funding
Abstract
Biomolecules associate, forming condensates that house essential biochemical processes, including ribosome biogenesis. Unraveling how condensates shape macromolecular assembly and transport requires cellular measurements of nanoscale structure. Here, we determine the organization around and between specific proteins at nanometer resolution within condensates, deploying thermodynamic principles to interpret partitioning measurements of designed protein probes. When applied to the nucleolus as a proof of principle, the data reveals considerable inhomogeneity, deviating from that expected within a liquid-like phase. The inhomogeneity can be attributed to ribosome biogenesis, with the local meshwork weakening as biogenesis progresses, facilitating transport. Beyond introducing an innovative modality for biophysical interrogation, our results suggest condensates are far from uniform, simple liquids, a property we conjecture enables regulation and proofreading.
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