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- W4386163669 abstract "Ribosome footprint profiling has demonstrated that ribosomes can be slowed or stalled on select mRNAs, often due to the presence of rare codons, stalling motifs, or via a ribosome-binding protein (e.g., FMRP). Stalled ribosomes can act as physical roadblocks for trailing ribosomes and ultimately can cause ribosome collisions that stimulate no-go mRNA decay. Detecting stalled or slowed ribosomes in cells by ribosome footprint profiling or classic polysome profiling is laborious, technically challenging, and low throughput. Here, we present a protocol to assay for stalled ribosomes on in vitro-transcribed reporter mRNAs using a robust, commercially available mammalian in vitro translation lysate and an optimized low-speed sucrose cushion. In short, we take advantage of the ability of puromycin to incorporate into the nascent polypeptide and cause the ribosome to dissociate from the mRNA during active elongation, as well as the ability to selectively pellet ribosomes through a low-speed sucrose cushion due to their large molecular weight. Stalled ribosomes are not actively elongating and do not incorporate puromycin, allowing the ribosome-bound mRNA to pellet in the low-speed sucrose cushion. RT-qPCR is used to quantify the amount of ribosome-bound reporter mRNA in the pellet. This workflow allows for direct assessment of stalled ribosomes and is fully amendable to insertion of putative stalling motifs in the target mRNA, as well as supplementation with recombinant proteins or small molecule inhibitors that target translation elongation. Key features This protocol is optimized for cap-dependent in vitro translation in the dynamic linear range. Details for generating capped reporter mRNA in one day are provided. Requires as little as one day to complete if starting with in vitro-transcribed mRNA. This protocol requires access to an ultracentrifuge and a real-time PCR system." @default.
- W4386163669 created "2023-08-26" @default.
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- W4386163669 date "2023-01-01" @default.
- W4386163669 modified "2023-09-25" @default.
- W4386163669 title "In Vitro Analysis of Stalled Ribosomes using Puromycin Incorporation" @default.
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- W4386163669 doi "https://doi.org/10.21769/bioprotoc.4744" @default.
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- W4386163669 hasPublicationYear "2023" @default.
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