Proteomics

Dataset Information

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Nuclear RNA forms an interconnected network of transcription-dependent and tunable microgels


ABSTRACT: The human cell nucleus is comprised of proteins, chromatin and RNA, yet how they interact to form supramolecular structures and drive key biological processes remains unknown. Conflicting models have proposed either a fluid-like or solid-like nature for the intranuclear microenvironment. To reconcile this discrepancy, we investigated the 3D structure and properties of the nuclear interior using experiments and computer simulations. We reveal a novel mechanism where newly synthesized RNA interacts with SAF-A (scaffold attachment factor A, or HNRNPU), forming interconnected microgels degraded by the exonuclease XRN2, leading to dynamic cycles of gelation and fluidization. This emergent microgel network depends on transcription, and is disrupted by SAF- A depletion. It also decreases protein mobility and regulates chromatin compaction by modulating microphase separation, thereby opening transcriptionally active regions. This tunable intranuclear network exhibits scale-dependent fluid- and solid-like features, that we suggest may regulate transcription by controlling access to regulatory proteins and polymerases.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Nick Gilbert  

LAB HEAD: Nick Gilbert

PROVIDER: PXD053208 | Pride | 2024-06-18

REPOSITORIES: Pride

Dataset's files

Source:
Action DRS
02_R1-1.raw Raw
03_R1-2.raw Raw
04_R1-3.raw Raw
05_R2-1.raw Raw
06_R2-2.raw Raw
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