4ou7

Crystal structure of DnaT84-153-dT10 ssDNA complex reveals a novel single-stranded DNA binding mode

spinqualitylabelsall models 4ou7, resolution 2.83Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ou7 is a 6 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 4ou6 Resources: FirstGlance, OCA, RCSB, PDBsum Function [DNAT_ECOLI] This protein is required for primosome-dependent normal DNA replication; it is also involved in inducing stable DNA replication during SOS response. It forms, in concert with DnaB protein and other prepriming proteins DnaC, N, N', N a prepriming protein complex on the specific site of the template DNA recognized by protein N'.[HAMAP-Rule:MF_01061] Publication Abstract from PubMed DnaT is a primosomal protein that is required for the stalled replication fork restart in Escherichia coli. As an adapter, DnaT mediates the PriA-PriB-ssDNA ternary complex and the DnaB/C complex. However, the fundamental function of DnaT during PriA-dependent primosome assembly is still a black box. Here, we report the 2.83 A DnaT84-153-dT10 ssDNA complex structure, which reveals a novel three-helix bundle single-stranded DNA binding mode. Based on binding assays and negative-staining electron microscopy results, we found that DnaT can bind to phiX 174 ssDNA to form nucleoprotein filaments for the first time, which indicates that DnaT might function as a scaffold protein during the PriA-dependent primosome assembly. In combination with biochemical analysis, we propose a cooperative mechanism for the binding of DnaT to ssDNA and a possible model for the assembly of PriA-PriB-ssDNA-DnaT complex that sheds light on the function of DnaT during the primosome assembly and stalled replication fork restart. This report presents the first structure of the DnaT C-terminal complex with ssDNA and a novel model that explains the interactions between the three-helix bundle and ssDNA. Crystal structure of DnaT84-153-dT10 ssDNA complex reveals a novel single-stranded DNA binding mode.,Liu Z, Chen P, Wang X, Cai G, Niu L, Teng M, Li X Nucleic Acids Res. 2014 Jul 22. pii: gku633. PMID:25053836 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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