Structural basis of AlpA-dependent transcription antitermination
| العنوان: | Structural basis of AlpA-dependent transcription antitermination |
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| المؤلفون: | Aijia Wen, Minxing Zhao, Sha Jin, Yuan-Qiang Lu, Yu Feng |
| المصدر: | Nucleic Acids Research. 50:8321-8330 |
| بيانات النشر: | Oxford University Press (OUP), 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Bacterial Proteins, Transcription, Genetic, Protein Conformation, Cryoelectron Microscopy, Pseudomonas aeruginosa, Genetics, RNA, RNA-Binding Proteins, DNA-Directed RNA Polymerases, Promoter Regions, Genetic |
| الوصف: | AlpA positively regulates a programmed cell death pathway linked to the virulence of Pseudomonas aeruginosa by recognizing an AlpA binding element within the promoter, then binding RNA polymerase directly and allowing it to bypass an intrinsic terminator positioned downstream. Here, we report the single-particle cryo-electron microscopy structures of both an AlpA-loading complex and an AlpA-loaded complex. These structures indicate that the C-terminal helix-turn-helix motif of AlpA binds to the AlpA binding element and that the N-terminal segment of AlpA forms a narrow ring inside the RNA exit channel. AlpA was also revealed to render RNAP resistant to termination signals by prohibiting RNA hairpin formation in the RNA exit channel. Structural analysis predicted that AlpA, 21Q, λQ and 82Q share the same mechanism of transcription antitermination. |
| تدمد: | 1362-4962 0305-1048 |
| DOI: | 10.1093/nar/gkac608 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::352839f3f537e84b8ad5bcfe3a470500 https://doi.org/10.1093/nar/gkac608 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....352839f3f537e84b8ad5bcfe3a470500 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13624962 03051048 |
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| DOI: | 10.1093/nar/gkac608 |