1wgt
X-RAY STRUCTURE OF WHEAT GERM AGGLUTININ ISOLECTIN 3
Structural highlights
FunctionAGI3_WHEAT N-acetyl-D-glucosamine / N-acetyl-D-neuraminic acid binding lectin. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedWheat germ agglutinin isolectin 3 (WGA3) was crystallized from 10 mM acetate buffer at pH 4.9 containing 6 mM CaCl(2) and 4%(v/v) ethanol. The crystal belongs to monoclinic space group P2(1) with unit-cell dimensions a = 44.86, b = 91.02, c = 44.86 A, and beta = 110.22 degrees. The asymmetric unit contains two molecules (V(m) = 2.51 A(3) Da(-1)). The crystal structure was solved by the molecular-replacement method and was refined by the simulated-annealing method. The conventional R value was 0.191 for 19713 reflections [|F(o)| > 3sigma(F)] in the resolution range 8-1.9 A. The r.m.s. deviations from the ideal bond distances and angles were 0.014 A, and 3.0 degrees, respectively, and the estimated coordinate error was 0.2-0.25 A. The two molecules in the asymmetric unit are related by the pseudo twofold symmetry and form a dimer structure. The backbone structures of the two subunits are nearly identical with the r.m.s. difference of 0.36 A for the superposition of equivalent C(alpha) atoms. The dimer structure is very similar to those of isolectins 1 and 2 with the r.m.s. difference of 0.35-0.39 A for the C(alpha) superposition. Since amino-acid residues which differ from those of isolectin 1 or 2 are not involved in the contact between the two subunits, the subunit-subunit interaction is not significantly affected by the replacement of these residues. As a result, the geometry of the sugar-binding sites which are located at the interface between the two subunit molecules is basically conserved among three isolectins. X-ray structure of wheat germ agglutinin isolectin 3.,Harata K, Nagahora H, Jigami Y Acta Crystallogr D Biol Crystallogr. 1995 Nov 1;51(Pt 6):1013-9. PMID:15299769[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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