7xui | pdb_00007xui

Cryo-EM structure of sigma70 bound HK022 putRNA-associated E.coli RNA polymerase elongation complex

spinqualitylabelsall models 7xui, resolution 3.61Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7xui is a 8 chain structure with sequence from Escherichia coli K-12 and Escherichia virus HK022. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [RPOA_ECOLI] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. This subunit plays an important role in subunit assembly since its dimerization is the first step in the sequential assembly of subunits to form the holoenzyme.[HAMAP-Rule:MF_00059] Publication Abstract from PubMed Transcription, in which RNA polymerases (RNAPs) produce RNA from DNA, is the first step of gene expression. As such, it is highly regulated either by trans-elements like protein factors and/or by cis-elements like specific sequences on the DNA. Lambdoid phage HK022 contains a cis-element, put, which suppresses pausing and termination during transcription of the early phage genes. The putRNA transcript solely performs the anti-pausing/termination activities by interacting directly with the E.coli RNAP elongation complex (EC) by an unknown structural mechanism. In this study, we reconstituted putRNA-associated ECs and determined the structures using cryo-electron microscopy. The determined structures of putRNA-associated EC, putRNA-absent EC, and sigma(70)-bound EC suggest that the putRNA interaction with the EC counteracts swiveling, a conformational change previously identified to promote pausing and sigma(70) might modulate putRNA folding via sigma(70)-dependent pausing during elongation. Structural basis of transcriptional regulation by a nascent RNA element, HK022 putRNA.,Hwang S, Olinares PDB, Lee J, Kim J, Chait BT, King RA, Kang JY Nat Commun. 2022 Aug 15;13(1):4668. doi: 10.1038/s41467-022-32315-y. PMID:35970830 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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