4a1f

Crystal structure of C-terminal domain of Helicobacter pylori DnaB Helicase

spinqualitylabelsall models 4a1f, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4a1f is a 2 chain structure with sequence from Helicobacter pylori. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.5Å Ligands: FLC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DNAB_HELPY Participates in initiation and elongation during chromosome replication; it exhibits DNA-dependent ATPase activity and contains distinct active sites for ATP binding, DNA binding, and interaction with DnaC protein, primase, and other prepriming proteins (By similarity). Publication Abstract from PubMed Hexameric DnaB helicases are often loaded at DNA replication forks by interacting with the initiator protein DnaA and/or a helicase loader (DnaC in Escherichia coli). These loaders are not universally required, and DnaB from Helicobacter pylori was found to bypass DnaC when expressed in E. coli cells. The crystal structure of Helicobacter pylori DnaB C-terminal domain (HpDnaB-CTD) reveals a large two-helix insertion (named HPI) in the ATPase domain that protrudes away from the RecA fold. Biophysical characterization and electron microscopy (EM) analysis of the full-length protein show that HpDnaB forms head-to-head double hexamers remarkably similar to helicases found in some eukaryotes, archaea, and viruses. The docking of the HpDnaB-CTD structure into EM reconstruction of HpDnaB provides a model that shows how hexamerization of the CTD is facilitated by HPI-HPI interactions. The HpDnaB double-hexamer architecture supports an alternative strategy to load bacterial helicases onto forks in the absence of helicase loaders. Architecture of a dodecameric bacterial replicative helicase.,Stelter M, Gutsche I, Kapp U, Bazin A, Bajic G, Goret G, Jamin M, Timmins J, Terradot L Structure. 2012 Mar 7;20(3):554-64. PMID:22405014 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Helicase 3D structures

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