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- W2017006819 abstract "The venom of the common Indian krait (Bungarus caeruleus) contains about a dozen isoforms of phospholipase A2 (PLA2), which exist in different oligomeric forms as well as in complexes with low-molecular-weight ligands. The basic objective of multimerization and complexation is either to inactivate PLA2 in the venom for long-term storage, to generate a new PLA2 function or to make a more lethal assembly. The current isoform was isolated from the venom of B. caeruleus. Dynamic light-scattering studies indicated the presence of a stable trimeric association of this PLA2. Its primary sequence was determined by cDNA cloning. The purified protein was crystallized with 2.8 M NaCl as a precipitating agent using the sitting-drop vapour-diffusion method. The crystals belonged to the monoclinic space group C2, with unit-cell parameters a = 80.9, b = 80.5, c = 57.1 A, beta = 90.3 degrees. The structure was refined to a final R factor of 0.198. This is a novel trimeric PLA2 structure in which the central pore formed by the association of three molecules is filled with water molecules. The interactions across the pore take place via multiple water bridges primarily to the side chains of Arg, Lys and Thr residues. Approximately 12% of the total solvent-accessible surface area is buried in the core of the trimer. The active sites of all three molecules are located on the surface and are fully exposed to the solvent, resulting in a highly potent enzymatic unit." @default.
- W2017006819 created "2016-06-24" @default.
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- W2017006819 date "2004-10-16" @default.
- W2017006819 modified "2023-10-03" @default.
- W2017006819 title "Sequence-induced trimerization of phospholipase A<sub>2</sub>: structure of a trimeric isoform of PLA<sub>2</sub>from common krait (<i>Bungarus caeruleus</i>) at 2.5 Å resolution" @default.
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- W2017006819 doi "https://doi.org/10.1107/s1744309104025503" @default.
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