The X-ray crystal structure of native Scilla campanulata agglutinin, a mannose-specific lectin from bluebell bulbs and a member of the Liliaceae family, has been determined by molecular replacement and refined to an R value of 0.186 at 1.7 A resolution. The lectin crystallizes in space group P21212 with unit-cell parameters a = 70 ...
The X-ray crystal structure of native Scilla campanulata agglutinin, a mannose-specific lectin from bluebell bulbs and a member of the Liliaceae family, has been determined by molecular replacement and refined to an R value of 0.186 at 1.7 A resolution. The lectin crystallizes in space group P21212 with unit-cell parameters a = 70. 42, b = 92.95, c = 46.64 A. The unit cell contains eight protein molecules of Mr = 13143 Da (119 amino-acid residues). The asymmetric unit comprises two chemically identical molecules, A and B, related by a non-crystallographic twofold axis perpendicular to c. This dimer further associates by crystallographic twofold symmetry to form a tetramer. The fold of the polypeptide backbone closely resembles that found in the lectins from Galanthus nivalis (snowdrop) and Hippeastrum (amaryllis) and contains a threefold symmetric beta-prism made up of three antiparallel four-stranded beta-sheets. Each of the four-stranded beta-sheets (I, II and III) possesses a potential saccharide-binding site containing conserved residues; however, site II has two mutations relative to sites I and III which may prevent ligation at this site. Our study provides the first accurate and detailed description of a native (unligated) structure from this superfamily of mannose-specific bulb lectins and will allow comparisons with a number of lectin-saccharide complexes which have already been determined or are currently under investigation.
Related Citations:
Crystallisation and Preliminary Structural Studies of Scilla Campanulata Lectin Complexed with Alpha (1-6)-Mannobiose Wright, L.M., Wood, S.D., Reynolds, C.D., Rizkallah, P.J., Allen, A.K. (1998) Acta Crystallogr D Biol Crystallogr 54: 90
Scilla Campanulata Agglutinin Crystallized in Complex with the Trimannoside Alpha-D-Man-(1-6)-[Alpha-D-Man-(1-3)]-Alpha-D-Man Wright, L.M., Rizkallah, P.J., Wood, S.D., Reynolds, C.D. (1998) Acta Crystallogr D Biol Crystallogr 54: 665
Crystallisation and Preliminary Crystallographic Analysis of Scilla Campanulata Lectin Complexed with Alpha-D-Mannose Wright, L.M., Wood, S.D., Reynolds, C.D., Rizkallah, P.J., Allen, A.K. (1997) Protein Pept Lett 4: 343
Purification, Crystallisation and Preliminary X-Ray Analysis of a Mannose- Binding Lectin from Bluebell (Scilla Campanulata) Bulbs Wright, L.M., Wood, S.D., Reynolds, C.D., Rizkallah, P.J., Peumans, W.J., Vandamme, E.J.M., Allen, A.K. (1996) Acta Crystallogr D Biol Crystallogr 52: 1021
Organizational Affiliation:
School of Biomolecular Sciences, Max Perutz Building, Liverpool John Moores University, Liverpool L3 3AF, England.
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