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TitleFMRP regulates neuronal RNA granules containing stalled ribosomes, not where ribosomes stall.
Journal, issue, pagesElife, Vol. 14, Year 2026
Publish dateJul 20, 2026
AuthorsJewel T-Y Li / Mehdi Amiri / Senthilkumar Kailasam / Lily Drever / Jingyu Sun / Laura Bohorquez / Nahum Sonenberg / Joaquin Ortega / Wayne S Sossin /
PubMed AbstractLocal protein synthesis is a crucial process that maintains local proteostasis in neurons. A large percentage of mRNAs translated in developing neurons are associated with stalled ribosomes. FMRP, ...Local protein synthesis is a crucial process that maintains local proteostasis in neurons. A large percentage of mRNAs translated in developing neurons are associated with stalled ribosomes. FMRP, the protein lost in Fragile X syndrome, is highly enriched in RNA granules that contain stalled ribosomes. Previous examination of ribosome-protected fragments (RPFs) from stalled neuronal ribosomes identified sequences that match those found in mRNAs associated with FMRP. To investigate whether FMRP recognition of these sequences is important for determining where ribosomes stall on mRNAs, we examined RPFs isolated from P5 mice of both sexes that lack the FMRP protein. The loss of FMRP had no significant effect on the proteins associated with neuronal stalled ribosomes, on ribosome structure, or the stalling sites (locations where RPFs accumulated). There was a small, but significant decrease in the number of RPFs from mRNAs previously shown to be associated with FMRP by CLIP. Additionally, the number of neuronal RNA granules containing stalled ribosomes, as assayed by ribopuromycylation, decreased. These results suggest a role of FMRP in neuronal RNA granules that contain stalled ribosomes, though loss of FMRP does not influence where ribosomes are stalled or the formation of stalled ribosome.
External linksElife / PubMed:42474467 / PubMed Central
MethodsEM (single particle)
Resolution2.7 - 3.2 Å
Structure data

EMDB-70092: 80S Ribosome Rat Brain polysome fraction. Class 1
Method: EM (single particle) / Resolution: 2.7 Å

EMDB-70095: 80S Ribosome Rat Brain polysome fracAon. Class 2
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-76370: Rat 80S ribosome purified from brain RNA granules at 10 mM Magnesium. Class 1 80S with AP and PE tRNAs
Method: EM (single particle) / Resolution: 2.7 Å

EMDB-76379: Rat 80S ribosome purified from brain RNA granules at 10 mM Magnesium. Class 2 80S with PP tRNA
Method: EM (single particle) / Resolution: 3.2 Å

Source
  • Rattus norvegicus (Norway rat)

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