2oiy

Crystal structure of the duplex form of the HIV-1(LAI) RNA dimerization initiation site

spinqualitylabelsall models 2oiy, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2oiy is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.6Å Ligands: K, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The crystal structure of subtype-B HIV-1 genomic RNA Dimerization Initiation Site duplex revealed chain cleavage at a specific position resulting in 3'-phosphate and 5'-hydroxyl termini. A crystallographic analysis showed that Ba(2+), Mn(2+), Co(2+) and Zn(2+) bind specifically on a guanine base close to the cleaved position. The crystal structures also point to a necessary conformational change to induce an 'in-line' geometry at the cleavage site. In solution, divalent cations increased the rate of cleavage with pH/pKa compensation, indicating that a cation-bound hydroxide anion is responsible for the cleavage. We propose a 'Trojan horse' mechanism, possibly of general interest, wherein a doubly charged cation hosted near the cleavage site as a 'harmless' species is further transformed in situ into an 'aggressive' species carrying a hydroxide anion. Cation-dependent cleavage of the duplex form of the subtype-B HIV-1 RNA dimerization initiation site.,Ennifar E, Walter P, Dumas P Nucleic Acids Res. 2010 Sep 1;38(17):5807-16. Epub 2010 May 11. PMID:20460458 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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