Dynamic partitioning shapes the in vivo organization of the Escherichia coli RNA degradosome.

Dynamic intracellular partitioning of Escherichia coli RNA degradosome components links physiological state and translation to RNA decay.

• Why it matters: Understanding how degradosome components are organized and regulated in living bacteria is crucial for revealing mechanisms of RNA turnover, which impacts gene expression and cellular adaptation.
• What they did: Using live-cell single-molecule imaging, the study quantified the distribution and dynamics of four major E. coli degradosome proteins—RNase E, RhlB, PNPase, and enolase—and examined how their localization changed with growth conditions and RNA availability.
• The result: PNPase showed pronounced redistribution between membrane-associated and cytoplasmic pools in response to physiological cues, and degradosome organization was linked to differential degradation of transcripts based on translation strength, suggesting a dynamic, state-dependent RNA decay system.