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TitleMechanism of ribosome stalling during translation of a poly(A) tail.
Journal, issue, pagesNat Struct Mol Biol, Vol. 26, Issue 12, Page 1132-1140, Year 2019
Publish dateNov 25, 2019
AuthorsViswanathan Chandrasekaran / Szymon Juszkiewicz / Junhong Choi / Joseph D Puglisi / Alan Brown / Sichen Shao / V Ramakrishnan / Ramanujan S Hegde /
PubMed AbstractFaulty or damaged messenger RNAs are detected by the cell when translating ribosomes stall during elongation and trigger pathways of mRNA decay, nascent protein degradation and ribosome recycling. ...Faulty or damaged messenger RNAs are detected by the cell when translating ribosomes stall during elongation and trigger pathways of mRNA decay, nascent protein degradation and ribosome recycling. The most common mRNA defect in eukaryotes is probably inappropriate polyadenylation at near-cognate sites within the coding region. How ribosomes stall selectively when they encounter poly(A) is unclear. Here, we use biochemical and structural approaches in mammalian systems to show that poly-lysine, encoded by poly(A), favors a peptidyl-transfer RNA conformation suboptimal for peptide bond formation. This conformation partially slows elongation, permitting poly(A) mRNA in the ribosome's decoding center to adopt a ribosomal RNA-stabilized single-stranded helix. The reconfigured decoding center clashes with incoming aminoacyl-tRNA, thereby precluding elongation. Thus, coincidence detection of poly-lysine in the exit tunnel and poly(A) in the decoding center allows ribosomes to detect aberrant mRNAs selectively, stall elongation and trigger downstream quality control pathways essential for cellular homeostasis.
External linksNat Struct Mol Biol / PubMed:31768042 / PubMed Central
MethodsEM (single particle)
Resolution2.8 Å
Structure data

10181

6sgc

EMDB-10181, PDB-6sgc:
Rabbit 80S ribosome stalled on a poly(A) tail
Method: EM (single particle) / Resolution: 2.8 Å

Chemicals

ChemComp-MG:
Unknown entry

ChemComp-ZN:
Unknown entry

ChemComp-SPD:
SPERMIDINE / Spermidine

Source
  • oryctolagus cuniculus (rabbit)
  • homo sapiens (human)
  • Rabbit (rabbit)
KeywordsRIBOSOME / Protein Translation / Ribosome Stalling / polyA tail

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