7oqy
Cryo-EM structure of the cellular negative regulator TFS4 bound to the archaeal RNA polymeraseCryo-EM structure of the cellular negative regulator TFS4 bound to the archaeal RNA polymerase
Structural highlights
FunctionRPO1N_SULAC DNA-dependent RNA polymerase (RNAP) catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Forms the clamp head domain.[HAMAP-Rule:MF_00863][1] [2] Publication Abstract from PubMedRNA polymerase inhibition plays an important role in the regulation of transcription in response to environmental changes and in the virus-host relationship. Here we present the high-resolution structures of two such RNAP-inhibitor complexes that provide the structural bases underlying RNAP inhibition in archaea. The Acidianus two-tailed virus encodes the RIP factor that binds inside the DNA-binding channel of RNAP, inhibiting transcription by occlusion of binding sites for nucleic acid and the transcription initiation factor TFB. Infection with the Sulfolobus Turreted Icosahedral Virus induces the expression of the host factor TFS4, which binds in the RNAP funnel similarly to eukaryotic transcript cleavage factors. However, TFS4 allosterically induces a widening of the DNA-binding channel which disrupts trigger loop and bridge helix motifs. Importantly, the conformational changes induced by TFS4 are closely related to inactivated states of RNAP in other domains of life indicating a deep evolutionary conservation of allosteric RNAP inhibition. Structural basis of RNA polymerase inhibition by viral and host factors.,Pilotto S, Fouqueau T, Lukoyanova N, Sheppard C, Lucas-Staat S, Diaz-Santin LM, Matelska D, Prangishvili D, Cheung ACM, Werner F Nat Commun. 2021 Sep 17;12(1):5523. doi: 10.1038/s41467-021-25666-5. PMID:34535646[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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