6yys | pdb_00006yys

Structure of Mycobacterium smegmatis HelD protein in complex with RNA polymerase core - State II, primary channel engaged and active site interfering

spinqualitylabelsall models 6yys, resolution 3.08Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6yys is a 6 chain structure with sequence from Mycolicibacterium smegmatis MC2 155. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.08Å Ligands: MG, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RPOA_MYCS2 DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.[HAMAP-Rule:MF_00059] Publication Abstract from PubMed RNA synthesis is central to life, and RNA polymerase (RNAP) depends on accessory factors for recovery from stalled states and adaptation to environmental changes. Here, we investigated the mechanism by which a helicase-like factor HelD recycles RNAP. We report a cryo-EM structure of a complex between the Mycobacterium smegmatis RNAP and HelD. The crescent-shaped HelD simultaneously penetrates deep into two RNAP channels that are responsible for nucleic acids binding and substrate delivery to the active site, thereby locking RNAP in an inactive state. We show that HelD prevents non-specific interactions between RNAP and DNA and dissociates stalled transcription elongation complexes. The liberated RNAP can either stay dormant, sequestered by HelD, or upon HelD release, restart transcription. Our results provide insights into the architecture and regulation of the highly medically-relevant mycobacterial transcription machinery and define HelD as a clearing factor that releases RNAP from nonfunctional complexes with nucleic acids. Mycobacterial HelD is a nucleic acids-clearing factor for RNA polymerase.,Kouba T, Koval' T, Sudzinova P, Pospisil J, Brezovska B, Hnilicova J, Sanderova H, Janouskova M, Sikova M, Halada P, Sykora M, Barvik I, Novacek J, Trundova M, Duskova J, Skalova T, Chon U, Murakami KS, Dohnalek J, Krasny L Nat Commun. 2020 Dec 18;11(1):6419. doi: 10.1038/s41467-020-20158-4. PMID:33339823 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also RNA polymerase 3D structures

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