3o8b

Visualizing ATP-dependent RNA Translocation by the NS3 Helicase from HCV

spinqualitylabelsall models 3o8b, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3o8b is a 2 chain structure with sequence from Hepatitis C virus subtype 1b. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.95Å Ligands: SO4, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q99AU2_9HEPC Publication Abstract from PubMed The structural mechanism by which nonstructural protein 3 (NS3) from the hepatitis C virus (HCV) translocates along RNA is currently unknown. HCV NS3 is an ATP-dependent motor protein essential for viral replication and a member of the superfamily 2 helicases. Crystallographic analysis using a labeled RNA oligonucleotide allowed us to unambiguously track the positional changes of RNA bound to full-length HCV NS3 during two discrete steps of the ATP hydrolytic cycle. The crystal structures of HCV NS3, NS3 bound to bromine-labeled RNA, and a tertiary complex of NS3 bound to labeled RNA and a non-hydrolyzable ATP analog provide a direct view of how large domain movements resulting from ATP binding and hydrolysis allow the enzyme to translocate along the phosphodiester backbone. While directional translocation of HCV NS3 by a single base pair per ATP hydrolyzed is observed, the 3' end of the RNA does not shift register with respect to a conserved tryptophan residue, supporting a "spring-loading" mechanism that leads to larger steps by the enzyme as it moves along a nucleic acid substrate. Visualizing ATP-Dependent RNA Translocation by the NS3 Helicase from HCV.,Appleby TC, Anderson R, Fedorova O, Pyle AM, Wang R, Liu X, Brendza KM, Somoza JR J Mol Biol. 2010 Dec 9. PMID:21145896 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Helicase 3D structures

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