National Natural Science Foundation of China (NSFC)
32070040
China
Citation
Journal: Nucleic Acids Res / Year: 2022 Title: Structural basis of Streptomyces transcription activation by zinc uptake regulator. Authors: Xu Yang / Yiqun Wang / Guiyang Liu / Zixin Deng / Shuangjun Lin / Jianting Zheng / Abstract: 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 ...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 ScRNAPσHrdB-Zur-DNA structures define protein-protein and protein-DNA interactions involved in the principal housekeeping σHrdB-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 α subunit (αCTD) in a complex structure trapped in an active conformation. Key ScZur-αCTD 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.
Entire : Focused map on the Zur region of the Streptomyces coelicolor RNAP...
Entire
Name: Focused map on the Zur region of the Streptomyces coelicolor RNAP-promoter open complex with two Zur dimers
Components
Complex: Focused map on the Zur region of the Streptomyces coelicolor RNAP-promoter open complex with two Zur dimers
-
Supramolecule #1: Focused map on the Zur region of the Streptomyces coelicolor RNAP...
Supramolecule
Name: Focused map on the Zur region of the Streptomyces coelicolor RNAP-promoter open complex with two Zur dimers type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: #1-#8
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