8him | pdb_00008him

A cryo-EM structure of B. oleracea RNA polymerase V elongation complex at 2.73 Angstrom

spinqualitylabelsall models 8him, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8him is a 10 chain structure with sequence from Brassica oleracea. 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 A0A0D2ZPP3_BRAOL Publication Abstract from PubMed In addition to the conserved RNA polymerases (Pols) I-III in eukaryotes, two atypical polymerases, Pols IV and V, specifically produce non-coding RNA in the RNA-directed DNA methylation (RdDM) pathway in plants. Here, we report on the structures of cauliflower Pol V in the free and elongation conformations. A conserved tyrosine residue of NRPE2 stacks with a dsDNA branch of the transcription bubble to potentially attenuate elongation by inducing transcription stalling. The non-template DNA strand is captured by NRPE2 to enhance backtracking, thereby increasing 3'-5' cleavage which likely underpins Pol V's high fidelity. The structures also illuminate the mechanism of Pol V transcription stalling and enhanced backtracking which may be important for Pol V's retention on chromatin to serve its function in tethering downstream factors for RdDM. Structure and mechanism of the plant RNA polymerase V.,Xie G, Du X, Hu H, Li S, Cao X, Jacobsen SE, Du J Science. 2023 Mar 9:eadf8231. doi: 10.1126/science.adf8231. PMID:36893216 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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