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A novel complex of phospholipase A2 complexed with another venom protein has been isolated and purified from saw-scaled viper (Echis carinatus) venom. The molecular weights of the two components are 16 and 14 kDa, respectively. The complex was purified using an Affigel blue column and an anion-exchange (DEAE Sephacel) column. Long diamond-shaped crystals were obtained by hanging-drop vapour diffusion. The protein complex was dissolved at a concentration of 10 mg ml−1 in 20 mM sodium cacodylate, 1 mM CaCl2 and 2% dioxane at pH 6.0. The reservoir contained the same buffer with 7%(w/v) PEG 4000. Crystals appeared within 2–3 weeks. Native data to 2.9 Å resolution have been obtained at 291 K. The crystals belong to the monoclinic space group P21 with unit-cell parameters a = 74.47, b = 47.87, c = 106.39 Å, β = 104.5° and contain two molecules per asymmetric unit. Structure determination by molecular replacement is in progress.

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