adherent hek293t cells (ATCC)
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Adherent Hek293t Cells, supplied by ATCC, used in various techniques. Bioz Stars score: 99/100, based on 38021 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
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1) Product Images from "Eukaryotic tRNA ligases mediate RNA break repair"
Article Title: Eukaryotic tRNA ligases mediate RNA break repair
Journal: bioRxiv
doi: 10.64898/2026.05.26.727988
Figure Legend Snippet: (A) Schematic of the density-ultracentrifugation assay to investigate whether the α-fragment remains attached to the ribosome after cleavage with restrictocin. (B) The α-fragment remains attached to the ribosome, by Northern blot it is only detected in the positive control and in the ribosome-containing pellet fraction. n=3 independent experiments. (C) Urea-PAGE analysis of 80S ribosome cleavage and repair. HEK293T 80S ribosomes are cleaved with purified restrictocin, after cleavage the α-fragment band appears, which is reduced in intensity after incubation with RTCB or Trl1 for 2 h. (D) Quantification of (C). Repair with both tRNA ligases leads to a significant decrease in α-fragment-band intensity, normalized to 5S rRNA as a loading control. n=4 independent experiments. (E) Schematic for the hybrid luciferase in vitro translation assay, using ribosome-depleted RRL and isolated 80S ribosomes from HEK293T cells to assay for translational activity after SRL cleavage and repair. (F) Luciferase activity measurement of hybrid luciferase in vitro translation assay. Repair of inactivated ribosomes with RTCB significantly increases translational activity in the hybrid luciferase in vitro translation assay. n=3 independent experiments. Statistical significances for panels in this figure were determined using two tailed, unpaired t-test (defined significance levels: p<0.05 = *, p<0.01 = **, p<0.001 = ***, p<0.0001= ****). Error bars depict standard deviation (SD).
Techniques Used: Northern Blot, Positive Control, Purification, Incubation, Control, Luciferase, In Vitro, Isolation, Activity Assay, Two Tailed Test, Standard Deviation
Figure Legend Snippet: (A) Left: Schematic of the direct RNA nanopore sequencing for the restrictocin cleaved and RTCB/Trl1 repaired ribosomes. Right: Schematic of sequence coverage plots of the 28S rRNA around the SRL cleavage site. After cleavage with restrictocin, the sequence coverage drops, this drop is reduced after break repair with both tRNA ligases. (B) The sequence coverage drop is reduced by repair with both tRNA ligases. The sequence coverage 5′ of the cleavage site (nt 4550) was normalized to the sequence coverage 3′ of the cleavage site (nt 4650) for all analyzed samples after nanopore sequencing. n=4 independent experiments, statistical significance of cleavage and repair was determined by One-way ANOVA followed by Tukey’s multiple comparison test. (defined significance levels: p<0.05 = *, p<0.01 = **, p<0.001 = ***). (C) Around 60% of cleaved HEK293T ribosomes were repaired by RTCB, whereas ∼70% of ribosomes were repaired by Trl1. (D) Schematic of the unspecific breakage and repair assay, using RNase 4, which cleaves between any accessible U/A, or U/G dinucleotide on the isolated ribosomes, followed by repair with RTCB or Trl1 and nanopore sequencing-based breakage and repair site-mapping. (E-H) Most RNase4-induced RNA breaks show reduced relative 5′-end peak intensity or 3′-end peak intensity for both 28S and 18S rRNA after repair with RTCB (n=3 independent experiments). Hits were selected, when present in at least two replicates and when found by both analyses (<30 nt between 5′-end and 3′-end peak intensity). (I) Structural snapshots of the human ribosome (PDB 4ug0) . Shown in dark violet is the SRL as a reference point, the breakage sites identified by either analysis are shown in dark red, the space in between the mapped break sites is shown in light green. Error bars depict standard deviation (SD).
Techniques Used: Nanopore Sequencing, Sequencing, Comparison, Isolation, Standard Deviation
Figure Legend Snippet: (A) Schematic of the experimental setup treating the RTCB knockdown cells with increasing concentrations of menadione for 3 h, before analyzing the isolated total cellular via capillary electrophoresis. (B) Electropherograms showing the effect of the RTCB knockdown with increasing concentrations of menadione. With increasing menadione concentrations, RNA is more fragmented in the RTCB KD compared to the WT. (C) Plots for the relative fluorescent units (a.u., arbitrary units) for three concentrations of menadione (0 µM, 60 µM and 100 µM) of the electropherograms shown in (B). Top: Whole cell RNA plot. Bottom: zoom in to small RNA fragments (nt 0-1500). (D) eCDF plots of cumulative probability for each read length after nanopore sequencing of RNA from cells treated with 0 µM and 60 µM menadione. Shown are read lengths for 28S rRNA (axis break between 2999 nt and 4500 nt) and 18S. (E) eCDF plots of cumulative probability for each read length after nanopore sequencing using specific sequencing adapters for RPPH1 and RN7SK RNA from cells treated with 0 µM and 60 µM menadione. (F) Puromycin incorporation assay for HEK293T cells, treated with harringtonine as a control, and 3 different concentrations of menadione (40 µM, 60 µM, 100 µM) for 1 h. Median fluorescence intensity (MFI) of puromycin-AF488 is shown. For gating strategy refer to Figure S5C. (G) Polysome profiling (15-50% sucrose gradient fractionation) using either untreated cells, or cells treated with 60 µM menadione for 1 h. For quantification, profiles are categorized in three sections: 1) free mRNPs and 40S subunits, 2) sub- and light polysomes and 3) heavy polysomes. The peaks for 40S and 60S subunits, as well as for 80S ribosomes and polysomes are indicated. (H) Quantification of the AUC of the polysome profiles of ribosome/total ratios according to the 3 categories. N=4 independent experiments. (I) Western blot analysis specific for RTCB, and the ribosomal proteins RPLS6 (40S) and RPL10A (60S) using sucrose fractions from (H). (J) Viability assay of RTCB WT and RTCB knockdown cells treated with increasing concentrations of menadione. With increasing concentrations of menadione, cells are less viable in the RTCB KD compared to the WT. n=7 biological replicates. (K) Area under the curve (AUC) for the viability plots in (F). The AUC for the viability in the KD cells in significantly lower compared to the WT. Statistical significances for all panels in this figure were determined using unpaired t-test (defined significance levels: p<0.05 = *, p<0.01 = **, p<0.001 = ***, p<0.0001= ****). Error bars depict standard deviation (SD).
Techniques Used: Knockdown, Isolation, Electrophoresis, Nanopore Sequencing, Sequencing, Control, Fluorescence, Fractionation, Western Blot, Viability Assay, Standard Deviation
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