1wgt
From Proteopedia
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X-RAY STRUCTURE OF WHEAT GERM AGGLUTININ ISOLECTIN 3
Overview
Wheat 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.
About this Structure
1WGT is a Single protein structure of sequence from Triticum aestivum. Full crystallographic information is available from OCA.
Reference
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
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