1,548 results found
    1. Biochemistry and Chemical Biology

    eIF1A residues implicated in cancer stabilize translation preinitiation complexes and favor suboptimal initiation sites in yeast

    Pilar Martin-Marcos, Fujun Zhou ... Alan G Hinnebusch
    Substitutions in general translation initiation factor eIF1A found as recurring somatic mutations in uveal melanoma destabilize the closed conformation of the preinitiation complex at the start codon and increase discrimination against suboptimal initiation codons genome-wide.
    1. Chromosomes and Gene Expression

    The β-hairpin of 40S exit channel protein Rps5/uS7 promotes efficient and accurate translation initiation in vivo

    Jyothsna Visweswaraiah, Yvette Pittman ... Alan G Hinnebusch
    A structural element of mRNA exit channel protein Rps5 performs a critical role in start codon recognition during translation initiation by stabilizing initiator tRNA binding to the pre-initiation complex.
    1. Chromosomes and Gene Expression
    2. Neuroscience

    Activation of GCN2 kinase by ribosome stalling links translation elongation with translation initiation

    Ryuta Ishimura, Gabor Nagy ... Susan L Ackerman
    Activation of the integrated stress response by stalled translation elongation complexes attenuates neurodegeneration, and demonstrates a protective link between a decrease in the rate of translation initiation and defects in translation elongation.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Eukaryotic translation initiation factor 3 plays distinct roles at the mRNA entry and exit channels of the ribosomal preinitiation complex

    Colin Echeverría Aitken, Petra Beznosková ... Jon R Lorsch
    Eukaryotic translation initiation factor 3 (eIF3) is required to stabilize the binding of mRNA at the exit channel of the small ribosomal subunit and acts at the entry channel to accelerate mRNA recruitment to the translation preinitiation complex.
    1. Genetics and Genomics

    Yeast eIF2A has a minimal role in translation initiation and uORF-mediated translational control in vivo

    Swati Gaikwad, Fardin Ghobakhlou ... Alan G Hinnebusch
    Eliminating eukaryotic initiation factor 2 (eIF2) from wild-type budding yeast had little impact on translation of individual mRNAs, including those with regulatory upstream open-reading frames, even when canonical initiation factor eIF2 activity was impaired.
    1. Cell Biology

    Ribosome collisions trigger cis-acting feedback inhibition of translation initiation

    Szymon Juszkiewicz, Greg Slodkowicz ... Ramanujan S Hegde
    Ribosome collisions along an mRNA are shown to recruit factors that prevent additional ribosomes from initiating translation on that mRNA, thereby providing time to resolve the collision.
    1. Biochemistry and Chemical Biology
    2. Microbiology and Infectious Disease

    Translation initiation by the hepatitis C virus IRES requires eIF1A and ribosomal complex remodeling

    Zane A Jaafar, Akihiro Oguro ... Jeffrey S Kieft
    The hepatitis C virus IRES binds and remodels preassembled eukaryotic translation preinitiation complexes, using specific initiation factor protein within a "bacterial-like" mode of initiation that can function in both stressed and unstressed cells.
    1. Biochemistry and Chemical Biology

    A dynamic RNA loop in an IRES affects multiple steps of elongation factor-mediated translation initiation

    Marisa D Ruehle, Haibo Zhang ... Jeffrey S Kieft
    During initiation factor-independent RNA structure-driven translation initiation, a flexible RNA element drives the movement of a viral IRES through the ribosome's tRNA binding sites and promotes tRNA binding.
    1. Biochemistry and Chemical Biology
    2. Chromosomes and Gene Expression

    Yeast Ded1 promotes 48S translation pre-initiation complex assembly in an mRNA-specific and eIF4F-dependent manner

    Neha Gupta, Jon R Lorsch, Alan G Hinnebusch
    Yeast RNA helicase Ded1 stimulates ribosome recruitment of structure-laden native mRNAs in a reconstituted system by interactions between domains in Ded1 and initiation factor eIF4G that stabilizes a Ded1-eIF4F complex.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    Proteostasis is differentially modulated by inhibition of translation initiation or elongation

    Khalyd J Clay, Yongzhi Yang ... Michael Petrascheck
    Carefully controlling the level of protein synthesis reduction and mode of translation inhibitor action reveal different and sometimes opposing phenotypic effects following proteostasis stress, wherein protection via initiation inhibition specifically depends on heat shock factor 1.

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