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Crystallization and preliminary X-ray diffraction study of Lathyrus ochrus isolectin II complexed to the human
1Laboratoire de Cristallographie et de Cristallisation des Macromolécules Biologiques, URA no. 1296 du CNRS, Faculté de Médecine Secteur-Nord, Marseille, France.
Abstract:
Isolectin II (LOL II) isolated from the seeds of Lathyrus ochrus has been crystallized in the presence of the N2 fragment (18,500 Da) isolated from human lactotransferrin, which contains an N-acetyllactosamine type biantennary glycan linked to Asn137. This is the first example of a legume lectin crystallized with an N-glycosylprotein. Crystals of the LOL II-N2 complex belong to the tetragonal space group (P4(1)2(1)2 or the enantiomorph) with cell dimensions: a = b = 63.5 A, c = 251.9 A. They diffract well up to at least 3.5 A resolution and more weakly up to 2.8 A resolution. Assuming one functional half-entity in the asymmetric unit, an alpha, beta monomer complexed to one N2 fragment (24,500 Da + 18,500 Da) would give a Vm of 2.95 A3/Da and a solvent content of approximately 58%. SDS/polyacrylamide gels of the dissolved crystals show the presence of both the LOL II and N2 fragment.