5n94

Crystal Structure of Drosophila DHX36 helicase in complex with polyU

spinqualitylabelsall models 5n94, resolution 2.43Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5n94 is a 4 chain structure with sequence from Drosophila melanogaster and Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.428Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8SWT2_DROME Publication Abstract from PubMed Helicase DHX36 plays essential roles in cell development and differentiation at least partially by resolving G-quadruplex (G4) structures. Here we report crystal structures of the Drosophila homolog of DHX36 (DmDHX36) in complex with RNA and a series of DNAs. By combining structural, small-angle X-ray scattering, molecular dynamics simulation, and single-molecule fluorescence studies, we revealed that positively charged amino acids in RecA2 and OB-like domains constitute an elaborate structural pocket at the nucleic acid entrance, in which negatively charged G4 DNA is tightly bound and partially destabilized. The G4 DNA is then completely unfolded through the 3'-5' translocation activity of the helicase. Furthermore, crystal structures and DNA binding assays show that G-rich DNA is preferentially recognized and in the presence of ATP, specifically bound by DmDHX36, which may cooperatively enhance the G-rich DNA translocation and G4 unfolding. On the basis of these results, a conceptual G4 DNA-resolving mechanism is proposed. Molecular Mechanistic Insights into Drosophila DHX36-Mediated G-Quadruplex Unfolding: A Structure-Based Model.,Chen WF, Rety S, Guo HL, Dai YX, Wu WQ, Liu NN, Auguin D, Liu QW, Hou XM, Dou SX, Xi XG Structure. 2018 Mar 6;26(3):403-415.e4. doi: 10.1016/j.str.2018.01.008. Epub 2018, Feb 8. PMID:29429875 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Helicase 3D structures

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