A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä

Concerted transformation of a hyper-paused transcription complex and its reinforcing protein




TekijätZuber Philipp K., Said Nelly, Hilal Tarek, Wang Bing, Loll Bernhard, González-Higueras Jorge, Ramírez-Sarmiento César A., Belogurov Georgiy A., Artsimovitch Irina, Wahl Markus C., Knauer Stefan H.

KustantajaSpringer Nature

Julkaisuvuosi2024

JournalNature Communications

Tietokannassa oleva lehden nimiNature communications

Lehden akronyymiNat Commun

Artikkelin numero3040

Vuosikerta15

ISSN2041-1723

eISSN2041-1723

DOIhttps://doi.org/10.1038/s41467-024-47368-4

Verkko-osoitehttps://www.nature.com/articles/s41467-024-47368-4

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/387607704


Tiivistelmä
RfaH, a paralog of the universally conserved NusG, binds to RNA polymerases (RNAP) and ribosomes to activate expression of virulence genes. In free, autoinhibited RfaH, an α-helical KOW domain sequesters the RNAP-binding site. Upon recruitment to RNAP paused at an ops site, KOW is released and refolds into a β-barrel, which binds the ribosome. Here, we report structures of ops-paused transcription elongation complexes alone and bound to the autoinhibited and activated RfaH, which reveal swiveled, pre-translocated pause states stabilized by an ops hairpin in the non-template DNA. Autoinhibited RfaH binds and twists the ops hairpin, expanding the RNA:DNA hybrid to 11 base pairs and triggering the KOW release. Once activated, RfaH hyper-stabilizes the pause, which thus requires anti-backtracking factors for escape. Our results suggest that the entire RfaH cycle is solely determined by the ops and RfaH sequences and provide insights into mechanisms of recruitment and metamorphosis of NusG homologs across all life.

Ladattava julkaisu

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.





Last updated on 2024-26-11 at 18:38