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Purification, primary structure and potential functions of a novel lectin from Bauhinia forficata seeds


Mentele,  Reinhard
Lottspeich, Friedrich / Protein Analysis, Max Planck Institute of Biochemistry, Max Planck Society;

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Silva, M. C. C., Santana, L. A., Mentele, R., Ferreira, R. S., de Miranda, A., Silva-Lucca, R. A., et al. (2012). Purification, primary structure and potential functions of a novel lectin from Bauhinia forficata seeds. PROCESS BIOCHEMISTRY, 47(7), 1049-1059. doi:10.1016/j.procbio.2012.03.008.

A new lectin. Bfl. was purified from Bauhinia forficata seeds by ammonium sulfate fractionation. DEAE-Sephadex ion exchange chromatography, Sepharose-4B and chitin affinity chromatographies and Superdex 75 size exclusion chromatography. The molecular homogeneity and purity of BfL were assessed by reversed-phase H PLC. BfL appeared as a single band of approximately 27.0 kDa on SDS-PAGE under non-reducing and reducing conditions, and its molecular weight was determined to be 27,850 Da by LC/ESI-MS. Bit is a glycoprotein with a carbohydrate content of 6.24% determined by the phenol-sulfuric acid method. Fetuin, asialofetuin, thyroglobulin and azocasein inhibited the hemagglutinating activity of BfL, whereas saccharides did not. Bfl hemagglutinating activity was stable at 100 degrees C for 30 min, pH-dependent, with the highest activity at pH 6.0, and metal-independent. The primary structure of BfL shows similarity with other lectins from the genus Bauhinia. Deconvolution of the BfL circular dichroism (CD) spectrum indicated the presence of alpha-helix and beta structures. BfL increases coagulation time, but this effect is not related to human plasma kallikrein or human factor Xa inhibition. Bfl also inhibits ADP- and epinephrine-induced platelet aggregation in a dose-dependent manner and is the only currently described lectin from Bauhinia that exhibits anticoagulant and antiplatelet aggregating properties. (c) 2012 Elsevier Ltd. All rights reserved.