Two-dimensional crystallization on lipid monolayers and three-dimensional structure of sticholysin II, a cytolysin from the sea anemone Stichodactyla helianthus |
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Authors: | Martín-Benito J Gavilanes F de Los Ríos V Mancheño J M Fernández J J Gavilanes J G |
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Institution: | Centro de Microscopía Electrónica "Luis Brú," Universidad Complutense, 28040 Madrid, Spain. jmartinb@cub.uam.es |
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Abstract: | Sticholysin II (Stn II), a potent cytolytic protein isolated from the sea anemone Stichodactyla helianthus, has been crystallized on lipid monolayers. With Fourier-based methods, a three-dimensional (3D) model of Stn II, up to a resolution of 15 A, has been determined. The two-sided plane group is p22(1)2, with dimensions a = 98 A, b = 196 A. The 3D model of Stn II displays a Y-shaped structure, slightly flattened, with a small curvature along its longest dimension (51 A). This protein, with a molecular mass of 19. 2 kDa, is one of the smallest structures reconstructed with this methodology. Two-dimensional (2D) crystals of Stn II on phosphatidylcholine monolayers present a unit cell with two tetrameric motifs, with the monomers in two different orientations: one with its longest dimension lying on the crystal plane and the other with this same axis leaning at an angle of approximately 60 degrees with the crystal plane. |
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