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Image Search Results
Journal: Signal Transduction and Targeted Therapy
Article Title: Stem loop binding protein promotes SARS-CoV-2 replication via -1 programmed ribosomal frameshifting
doi: 10.1038/s41392-025-02277-w
Figure Lengend Snippet: SLBP bound to the stem loop region of SARS-CoV-2 -1 PRF RNA. a -1 PRF RNA sequences were conserved among the genome sequences of 19 different SARS-CoV-2 strains. The viral sequences were manually retrieved from the National Center for Biotechnology Information (NCBI). Sequence alignment was conducted using MEGA 11.0 software. b The proposed secondary structure of the SARS-CoV-2 -1 PRF element. c Schematic representations of the -1 PRF RNA studied, including full -1 PRF RNA, ΔSL2 mutant, ΔSL3 mutant, ΔSL1& 2 mutant, and ΔSL2&3 mutant. The schematic diagram was generated with IBS 2.0 ( https://ibs.renlab.org/#/server ). d RNA probes used were obtained from in vitro transcription. e Using cellular proteins extracted from H1299 cells, immunoprecipitation of tRSA-labeled wild-type and mutant -1 PRF RNA probes pulled down SLBP. tRSA-labeled random sequence RNA was used as a negative control ( n = 3). f Interaction between SLBP and wild-type -1 PRF RNA or predicted RNA sequence of -1 PRF RNA using RNA EMSAs. Lane 1, -1 PRF RNA truncated mutant I. Lane 2, -1 PRF RNA truncated mutant II. Lane 3, -1 PRF RNA truncated mutant III. Lane 4, -1 PRF RNA. Lane 5, -1 PRF RNA truncated mutant I + GST. Lane 6, -1 PRF RNA truncated mutant II + GST. Lane 7, -1 PRF RNA truncated mutant III + GST. Lane 8, -1 PRF RNA + GST. Lane 9, -1 PRF RNA truncated mutant I + GST-SLBP. Lane 10, -1 PRF RNA truncated mutant II + GST-SLBP. Lane 11, -1 PRF RNA truncated mutant III + GST-SLBP. Lane 12, -1 PRF RNA + GST-SLBP. Experiments were repeated three times with similar results. g Using cellular proteins extracted from H1299 cells, immunoprecipitation of random sequence RNA, wild-type and silent SL3 mutation -1 PRF RNA probes pulled down SLBP. h Schematic diagram of interaction models between SLBP and -1 PRF RNA through the molecular docking. The RNA pull-down followed by WB assay was performed to evaluate the interaction between SLBP mutants and -1 PRF RNA. Total cell lysates from H1299 cells transfected with different SLBP variants were used in the experiment. These variants included single mutations where arginine 46 was changed to alanine (R46A), serine 94 was changed to alanine (S94A), and a double mutation (R46A & S94A), where both arginine 46 and serine 94 were replaced with alanine, respectively. Meanwhile, total cell lysates from H1299 cells transfected with wild-type SLBP (WT) were used as a positive control. i Co-detection of SLBP with -1 PRF RNA. Polyclonal anti-SLBP was used for SLBP protein immunofluorescence. Scale bar = 20 µm. j Schematic diagram of five host factors promoting SARS-CoV-2 replication via regulating frameshifting. SARS-CoV-2 apply the -1 PRF mechanism to switch complete protein translation from ORF1a to ORF1b, while FUBP3, SLBP, RPL10A, RPS3A, and RPS14 bind directly to the SARS-CoV-2 -1 PRF RNA to promote replication via enhancing the switch procedure. The expression of SFL inhibited SARS-CoV-2 replication via reducing frameshifting. The schematic diagram was generated with www.figdraw.com . Data points represent the mean ± SEM. Multiple comparisons were performed using ANOVA with Dunnett’s test. * P < 0.05, ** P < 0.01, and *** P < 0.001
Article Snippet: To generate RNA pull-down probes, pcDNA3.0-random sequence-tRSA, pcDNA3.0-(-1
Techniques: Sequencing, Software, Mutagenesis, Generated, In Vitro, Immunoprecipitation, Labeling, Negative Control, Transfection, Positive Control, Immunofluorescence, Expressing