National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01-GM120552
United States
Citation
Journal: Cell Rep / Year: 2021 Title: Conserved heterodimeric GTPase Rbg1/Tma46 promotes efficient translation in eukaryotic cells. Authors: Fuxing Zeng / Xin Li / Melissa Pires-Alves / Xin Chen / Christopher W Hawk / Hong Jin / Abstract: Conserved developmentally regulated guanosine triphosphate (GTP)-binding proteins (Drgs) and their binding partner Drg family regulatory proteins (Dfrps) are important for embryonic development, ...Conserved developmentally regulated guanosine triphosphate (GTP)-binding proteins (Drgs) and their binding partner Drg family regulatory proteins (Dfrps) are important for embryonic development, cellular growth control, differentiation, and proliferation. Here, we report that the yeast Drg1/Dfrp1 ortholog Rbg1/Tma46 facilitates translational initiation, elongation, and termination by suppressing prolonged ribosome pausing. Consistent with the genome-wide observations, deletion of Rbg1 exacerbates the growth defect resulting from translation stalling, and Rbg1 stabilizes mRNAs against no-go decay. Furthermore, we provide a cryoelectron microscopy (cryo-EM) structure of the 80S ribosome bound with Rbg1/Tma46 that reveals the molecular interactions responsible for Rbg1/Tma46 function. The Rbg1 subunit binds to the GTPase association center of the ribosome and the A-tRNA, and the N-terminal zinc finger domain of the Tma46 subunit binds to the 40S, establishing an interaction critical for the ribosomal association. Our results answer the fundamental question of how a paused ribosome resumes translation and show that Drg1/Dfrp1 play a critical role in ensuring orderly translation.
History
Deposition
Aug 9, 2021
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Header (metadata) release
Nov 10, 2021
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Map release
Nov 10, 2021
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Update
Nov 20, 2024
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Current status
Nov 20, 2024
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Name: P-tRNA / type: rna / ID: 82 Details: Althrough the position 34 is G or A in NCBI database. But it can only be U base on the density. It might be a varient tRNA from the yeast. Number of copies: 1
Name: 60S ribosomal protein L1 / type: protein_or_peptide / ID: 87 Details: Only show the backbone of the protein due to the poor density Number of copies: 1 / Enantiomer: LEVO
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