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TitleA role for the Saccharomyces cerevisiae ABCF protein New1 in translation termination/recycling.
Journal, issue, pagesNucleic Acids Res, Vol. 47, Issue 16, Page 8807-8820, Year 2019
Publish dateSep 19, 2019
AuthorsVillu Kasari / Agnieszka A Pochopien / Tõnu Margus / Victoriia Murina / Kathryn Turnbull / Yang Zhou / Tracy Nissan / Michael Graf / Jiří Nováček / Gemma C Atkinson / Marcus J O Johansson / Daniel N Wilson / Vasili Hauryliuk /
PubMed AbstractTranslation is controlled by numerous accessory proteins and translation factors. In the yeast Saccharomyces cerevisiae, translation elongation requires an essential elongation factor, the ABCF ...Translation is controlled by numerous accessory proteins and translation factors. In the yeast Saccharomyces cerevisiae, translation elongation requires an essential elongation factor, the ABCF ATPase eEF3. A closely related protein, New1, is encoded by a non-essential gene with cold sensitivity and ribosome assembly defect knock-out phenotypes. Since the exact molecular function of New1 is unknown, it is unclear if the ribosome assembly defect is direct, i.e. New1 is a bona fide assembly factor, or indirect, for instance due to a defect in protein synthesis. To investigate this, we employed yeast genetics, cryo-electron microscopy (cryo-EM) and ribosome profiling (Ribo-Seq) to interrogate the molecular function of New1. Overexpression of New1 rescues the inviability of a yeast strain lacking the otherwise strictly essential translation factor eEF3. The structure of the ATPase-deficient (EQ2) New1 mutant locked on the 80S ribosome reveals that New1 binds analogously to the ribosome as eEF3. Finally, Ribo-Seq analysis revealed that loss of New1 leads to ribosome queuing upstream of 3'-terminal lysine and arginine codons, including those genes encoding proteins of the cytoplasmic translational machinery. Our results suggest that New1 is a translation factor that fine-tunes the efficiency of translation termination or ribosome recycling.
External linksNucleic Acids Res / PubMed:31299085 / PubMed Central
MethodsEM (single particle)
Resolution3.28 Å
Structure data

10098

6s47

EMDB-10098, PDB-6s47:
Saccharomyces cerevisiae 80S ribosome bound with ABCF protein New1
Method: EM (single particle) / Resolution: 3.28 Å

Chemicals

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

Source
  • saccharomyces cerevisiae (brewer's yeast)
  • Baker's yeast (brewer's yeast)
KeywordsRIBOSOMAL PROTEIN / New1 / ABCF / Recycling / Termination / Translation

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