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-Structure paper
タイトル | Structural and functional basis of the universal transcription factor NusG pro-pausing activity in Mycobacterium tuberculosis. |
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ジャーナル・号・ページ | Mol Cell, Vol. 83, Issue 9, Page 1474-11488.e8, Year 2023 |
掲載日 | 2023年5月4日 |
著者 | Madeleine Delbeau / Expery O Omollo / Ruby Froom / Steven Koh / Rachel A Mooney / Mirjana Lilic / Joshua J Brewer / Jeremy Rock / Seth A Darst / Elizabeth A Campbell / Robert Landick / |
PubMed 要旨 | Transcriptional pauses mediate regulation of RNA biogenesis. DNA-encoded pause signals trigger pausing by stabilizing RNA polymerase (RNAP) swiveling and inhibiting DNA translocation. The N-terminal ...Transcriptional pauses mediate regulation of RNA biogenesis. DNA-encoded pause signals trigger pausing by stabilizing RNA polymerase (RNAP) swiveling and inhibiting DNA translocation. The N-terminal domain (NGN) of the only universal transcription factor, NusG/Spt5, modulates pausing through contacts to RNAP and DNA. Pro-pausing NusGs enhance pauses, whereas anti-pausing NusGs suppress pauses. Little is known about pausing and NusG in the human pathogen Mycobacterium tuberculosis (Mtb). We report that MtbNusG is pro-pausing. MtbNusG captures paused, swiveled RNAP by contacts to the RNAP protrusion and nontemplate-DNA wedged between the NGN and RNAP gate loop. In contrast, anti-pausing Escherichia coli (Eco) NGN contacts the MtbRNAP gate loop, inhibiting swiveling and pausing. Using CRISPR-mediated genetics, we show that pro-pausing NGN is required for mycobacterial fitness. Our results define an essential function of mycobacterial NusG and the structural basis of pro- versus anti-pausing NusG activity, with broad implications for the function of all NusG orthologs. |
リンク | Mol Cell / PubMed:37116494 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.9 - 3.71 Å |
構造データ | EMDB-27935, PDB-8e74: EMDB-27938, PDB-8e79: EMDB-27942, PDB-8e82: EMDB-27944, PDB-8e8m: EMDB-27956, PDB-8e95: |
化合物 | ChemComp-ZN: ChemComp-MG: |
由来 |
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キーワード | TRANSCRIPTION/DNA/RNA / RNA polymerase / transcription factor / elongation / pausing / transcription-transferase-DNA complex / TRANSCRIPTION-DNA-RNA complex / TRANSCRIPTION / TRANSFERASE/DNA/RNA / TRANSFERASE-DNA-RNA complex |