7x76

Cryo-EM structure of Streptomyces coelicolor RNAP-promoter open complex with two Zur dimers

spinqualitylabelsall models 7x76, resolution 3.67Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7x76 is a 13 chain structure with sequence from Streptomyces coelicolor A3(2). 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 [A0A6G2M9E1_9ACTN] 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 Streptomyces coelicolor (Sc) is a model organism of actinobacteria to study morphological differentiation and production of bioactive metabolites. Sc zinc uptake regulator (Zur) affects both processes by controlling zinc homeostasis. It activates transcription by binding to palindromic Zur-box sequences upstream of -35 elements. Here we deciphered the molecular mechanism by which ScZur interacts with promoter DNA and Sc RNA polymerase (RNAP) by cryo-EM structures and biochemical assays. The ScZur-DNA structures reveal a sequential and cooperative binding of three ScZur dimers surrounding a Zur-box spaced 8 nt upstream from a -35 element. The ScRNAPsigmaHrdB-Zur-DNA structures define protein-protein and protein-DNA interactions involved in the principal housekeeping sigmaHrdB-dependent transcription initiation from a noncanonical promoter with a -10 element lacking the critical adenine residue at position -11 and a TTGCCC -35 element deviating from the canonical TTGACA motif. ScZur interacts with the C-terminal domain of ScRNAP alpha subunit (alphaCTD) in a complex structure trapped in an active conformation. Key ScZur-alphaCTD interfacial residues accounting for ScZur-dependent transcription activation were confirmed by mutational studies. Together, our structural and biochemical results provide a comprehensive model for transcription activation of Zur family regulators. Structural basis of Streptomyces transcription activation by zinc uptake regulator.,Yang X, Wang Y, Liu G, Deng Z, Lin S, Zheng J Nucleic Acids Res. 2022 Aug 12;50(14):8363-8376. doi: 10.1093/nar/gkac627. PMID:35871291 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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