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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Start codon-associated ribosomal frameshifting mediates nutrient stress adaptation.

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    Ribosomes can shift reading frames immediately from the start codon, a process called start codon-associated ribosome frameshifting (SCARF). This explains unannotated proteomic data and aids nutrient stress adaptation.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Proteomics

    Background:

    • Traditionally, ribosomes are believed to strictly adhere to the reading frame set by the start codon.
    • Unannotated mass spectrometry spectra suggest alternative translation events occur.
    • Understanding translational fidelity is crucial for accurate protein synthesis.

    Approach:

    • Utilized super-resolution ribosome profiling to observe ribosome behavior.
    • Employed a massively paralleled reporter assay to identify regulatory sequence elements.
    • Investigated the role of eukaryotic initiation factor 5B (eIF5B) in maintaining reading frame fidelity.

    Key Points:

    • Discovered pervasive out-of-frame translation immediately from the start codon, termed start codon-associated ribosome frameshifting (SCARF).
    • Identified sequence elements that enhance or repress SCARF, indicating coupling between start codon recognition and reading frame fidelity.
    • eIF5B stabilizes initiating ribosomes to maintain reading frame fidelity.

    Conclusions:

    • SCARF provides a mechanism to explain thousands of unannotated human proteome mass spectrometry spectra.
    • Amino acid starvation induces SCARF via eIF5B proteasomal degradation, enabling cellular adaptation.
    • Translational "noise" through SCARF plays a beneficial role in nutrient stress adaptation.